Based on the precipitation, temperature and runoff data of the meteorological station and hydrological station in the upstream of the Yongding River Basin, the spatial distribution of temperature and precipitation in the basin from 1960 to 2012 is analyzed, and the evolution characteristics of runoff, temperature, and precipitation in the upstream and main tributaries of the Yongding River Basin are revealed. The results show that the temperature and precipitation in the basin are significantly different in space; the temperature has a significant increasing trend, the runoff shows a significant decreasing trend, and the precipitation change trend is not obvious; the temperature and runoff in the basin have significant mutation points, and precipitation. There is no obvious mutation point and the annual fluctuation is large; the temperature in the basin is changed in four seasons, and the distribution of precipitation is extremely uneven during the year. Before the 1980s, the changes in the annual and chronological changes of the basin runoff are related to the changes of temperature and precipitation. After the 1980s, its relevance is small; human activities such as water conservancy projects and social water use are the main influencing factors of runoff changes. Therefore, the unreasonable development and utilization of water resources in the basin should be highly valued.

System Dynamics (SD) and Ecological Footprint (EF) is used to construct SD-EF model of water resources carrying capacity in Zhengzhou City. Four schemes of status trend, economic development, green water saving and comprehensive response are set up to simulate and analyze water resources carrying capacity of Zhengzhou City in 2016-2030. The results show that comprehensive response scheme is the best scheme of those four schemes, and then according to the characteristics of the optimal scheme, the countermeasures for enhancing the water resources carrying capacity of Zhengzhou City are put forward.

This paper presents a new risk research methodology by integrating impact factor identification, risk evaluation, and transfer characteristics analysis within a framework applied to the Pearl River basin for case study. Firstly, this paper uses extension analysis model to evaluate the flood risks in the Pearl River Basin. Then, the Markov model is used to study the temporal variation of risk. Finally, the spatial Markov chain model is used to explore the effect of risk transfer. Results show that: ①The flood risk in the Pearl River Delta is high while lower risks occur in the North Panjiang and South Panjiang River basins. ②The probability that flood risks keeping unchanged is rather high, the variations in the probability gradually occur between the two neighboring levels. Subject to the impact of the confluence of upstream water resources areas, the flood risks exhibit the accumulation effect. ③The flood risk transfer from the upstream to downstream is more positive than negative, and the downstream risk has increased; ④The area with high risk shows enhanced transfer mechanism while the area with low risk shows decreased transfer mechanism.

By using the ASD model, the statistical factors of the climate factors in the low, medium, and high concentration emission scenarios output from the four general circulation models (GCM) of CanESM2, CNRM-CM5, GFDL-ESM3M, and MIROC-ESM-CHEM are downscaled to the Yalong River basin at 15 weather stations, the daily precipitation in the reference period is simulated and compared with the measured values. The effects of 4 GCMs on the simulation of precipitation in the study area are compared and analyzed. At the same time, the precipitation of the basin in the future 2021-2100 years is predicted. The results show that the applicability of each model on the Yalong River is MIROC> GFDL> CNRM> CanESM; the future precipitation of the Yalong River basin will show an increasing trend, and the precipitation will increase as the concentration of emissions increases.

Water resources is the core element of a country's sustainable development. In the context of the Sino-US Trade War, the study of virtual water trade among countries is helpful to understand the sustainable development of China's water resources and economy, and also can provide a basis for formulating economic and trade policies and water resources management. To describe the indirect pulling effect of industry production in one country to the other country on water, based on the input-output model of water resources, this paper improves the calculation method of virtual water transfer among industries, and puts forward a new method to calculate the pulling coefficient of industries between this two countries by using world input-output tables. And this paper also analyzes the industrial water characteristic indexes, virtual water transfer among industries and virtual water trade between China and the United States during 2005-2014. The main conclusions are as follows: (1) The scientific and technological industry, information and communication industry have strong pulling effect on water use of various industries in the United States, and the construction industry in the United States has strong pulling effect on water of various industries in China. In addition, the agriculture, electricity and gas supply industries in both countries are less efficient, while the finance and insurance, information and communications industries are more efficient. (2) The flow direction of virtual water between industries is the primary industry flowing to the secondary industry, then to the tertiary industry, and the water consumption efficiency is also increasing successively by the primary, secondary and tertiary industries. (3) In the trade between these two countries, China's net export of virtual water to the United States decreased at first and then increased, the United States' net export of virtual water to China has been increasing. However, China has always export virtual water to the United States. China exports virtual water to the U.S. mainly through manufactured goods, while the U.S. exports virtual water to China mainly through agricultural products.

In the parameter optimization of Masjingen model, the traditional hybrid leapfrog algorithm is prone to problems such as premature maturity and slow convergence speed. In improving the estimation accuracy of model parameters and the optimization performance of the algorithm, the epsilon-DE algorithm is combined with SFLA, and the constrained problem is transformed to solve the optimal solution from both sides of feasible regions and non-feasible regions. At the same time, Euclidean distance and differential hybrid mutation operator are introduced to improve individual updating efficiency and global optimization ability of the algorithm. It satisfies the diversity of individual information in the updating iteration of the algorithm, thus optimizing the convergence efficiency and calculation accuracy of the algorithm. By using epsilon DE-SFLA to estimate the parameters of mastingen model, the results show that epsilon DE-SFLA has obvious optimization effect and is more practical when dealing with constrained optimization problems.

In view of the characteristics of multi-attribute, multi-level and unable to quantify all the systems and measures in the assessment of the most stringent water management system, the assessment index system of water resources management is constructed from four aspects including total water use control, water efficiency control, water function zone pollution limitation and foundation abilities building. According to the golden section theory, the evaluation collection is established for the assessment of water resources management system and measures implementation. The cloud model is used to describe the fuzzy uncertainty of qualitative indicators for reflecting the conversion between qualitative concepts and quantitative values. The proposed model employs the combination of the fuzzy interval analytic hierarchy process(FAHP) and entropy weight method（EWM） to compute the synthetic weights of indicators at all levels to reduce the impact of subjective factors on the evaluation results. Then by using the reverse cloud generator further, the overall evaluation result cloud map is drawn to intuitively determine the evaluation level. In case study, the evaluation procedure is demonstrated for the assessment of the implementation of water resources management system and measures from 2016 to 2018 in Jiangsu Province. The evaluation results show that the implementation of water resources management system and measures in Jiangsu Province is in a very good level, basically consistent with the actual assessment of the province in recent years, which verifies the calculation results of the evaluation model can provide certain decision-making reference for the assessment of regional water resources management.

In order to investigate the effect of the gill-piece spacing concentration on water-sediment separation efficiency in the gill-piece separation device (GPSD) under hydrodynamic water conditions, Physical model test method is applied to the water sediment separation efficiency test of gill-piece separation device(GPSD) and common pipe is carried out. The results show that : When the gill-piece spacing is 30, 40, 50, 80 and 110 mm,the water sediment separation efficiency is as1.70～3.76, 1.71～3.75, 1.71～3.76, 1.38～2.63, 1.25～2.13 times as common pipe. The water-sediment separation efficiency with time in different gill-piece spacing includes the stages of slow increase, rapid increase and slow increase but ordinary tube only has slow growth stage. When the spacing of gill slice is less than 50 mm, the water and sand separation efficiency changes little with the decrease of the spacing, floating around 35%. Considering the water and sand separation efficiency and economic benefits in the actual project, it is most suitable to take the gill spacing of 50 mm, and the water and sand separation efficiency is 1.34～3.99, 1.61～5.77 times of 80, 110 mm, and up to 35.12%.

In order to provide the basis for the high concentration N and P drainage runoff retention and utilization in the early stage of farmland rainfall to reduce the pollution of receiving water body, the change characteristics of farmland drainage under the condition of constant rainfall intensity of 4mm / h are studied under the condition of vegetation coverage of 0, 22%, 49%, 79% and 100% in different growth periods of rape. The results show that: ① with the increase in vegetation coverage, the initial drainage time of farmland is obviously delayed, and the discharge in the early 20 minutes of drainage also decreases with the increase in vegetation coverage. ②With the increase in vegetation coverage, the concentrations of n elements in farmland drainage gradually increased. ③ With the increase in vegetation coverage, the concentration of P in farmland drainage showed different trends with different forms. The concentrations of DP and PP decreased with the increase in vegetation coverage. This shows that the ground cover vegetation can effectively extend the drainage time of farmland, reduce the flow in the early stage of farmland drainage, and effectively reduce the loss of farmland water and fertilizer. Therefore, increasing vegetation coverage is one of the effective ways to reduce water and fertilizer loss. Ground cover vegetation can also effectively reduce the concentration of P in farmland drainage, but it cannot reduce the concentration of N in farmland drainage. Therefore, it is not feasible to increase vegetation coverage to reduce the concentration of N in farmland drainage in the sandy loam area in the humid climate area of the north subtropical zone, only through the change of fertilization method.

In order to further explore the mechanism between rice growth and water nutrients, give full play to the coupling effect of water and fertilizer, the experimental study on the comprehensive regulation of water and fertilizer was carried out at Hubei Provincial Central Station. Three irrigation modes were set up: conventional flooding irrigation mode (W0), intermittent irrigation mode (W1), and rain-storing intermittent irrigation mode (W2), as well as three levels of nitrogen application: no nitrogen fertilizer treatment (N0), local actual nitrogen level (N1), local application nitrogen level 75% (N2); There are two kinds of fertilization methods: base fertilizer + primary topdressing (F1), base fertilizer + secondary topdressing (F2). The test results show that compared with flooding irrigation mode (W0), intermittent irrigation mode is beneficial to the late growth and high yield of rice, the total nitrogen emission load is reduced by 26%, the total phosphorus is reduced by 11%, and the utilization rate of nitrogen fertilizer is increased by 5.2%; Compared with intermittent irrigation mode, rain-storing intermittent irrigation mode will promote the growth of rice during the whole growth period, but in the later stage, excessive stems and leaves will slightly reduce the yield, total nitrogen emission load decreased 29%, total phosphorus decreased 39%, and the nitrogen fertilizer utilization rate is equivalent; Increasing the amount of nitrogen in a certain range can promote the growth and high yield of rice; And increasing the number of topdressing under high nitrogen can promote the late growth and high yield of rice, but increasing the number of topdressing under low nitrogen may have the opposite effect.

In order to improve the utilization rate of post-wheat idle farmland in Hetao Irrigation District, and realize the cropping mode of two crops a year in the irrigation district, a trial of multi-broccoli broccoli cultivation under wheat under drip irrigation is conducted. To study the effects of different irrigation water quantities (232.5, 273, 300 mm) on the growth, yield and water use efficiency of broccoli under film drip irrigation and put forward the optimum irrigation water for broccoli replanting after wheat under drip irrigation. The results show that with the increase in irrigation water, the growth status, dry matter accumulation, yield and water use efficiency of broccoli generally increases first and then decreases. When the irrigation water amount is 273 mm, the indicators reach the best. Among them, broccoli yield and water use efficiency has increased by 20.48% and 31.29%, respectively. Therefore, combined with the above indicators, it is suggested that the suitable irrigation water for post-wheat replanted broccoli under drip irrigation is 273 mm.

In order to promote the dark tube drainage technology in the application of salinization area of southern Xinjiang crop land, given a typical land of the second regiment area of Shajingzi of Southern Xinjiang Reclamation Area as an example, this paper studies the effect in different pale diameters and gaps of underground pales on the quality of drain by experiment. It turns out that, compared with irrigation water, the drain of underground pales is evidently high in conductivity and salinity. The average salinity of processed underground piles water in different months-June, August and October-are 6.427, 7.382 and 6.781 g/L respectively, which are 8.33,8.58 and 10.76 times as the irrigation water does during the same months. And the average conductivity are 4.833, 6.222 and 5.379 mS/cm, which are 7.92, 10.55, and 10.98 times as the irrigation water does during the same months. Besides, the underground pipes diameters have an apparent effect on the salinity and conductivity of the drain: if on the same gaps condition，the wider pipes are，the higher conductivity and salinity will be. If on the same pipe diameter condition，the bigger the gaps are, the higher conductivity and salinity will be. The drain's mean conductivity and salinity processed by pipes diameter of 60 mm and pipes gap of 6m are 8.562, 9.070,8.807 g/L and 6.670,7.910,7.364 mS/cm, respectively.

In the investment of agricultural irrigation and drainage station new construction and renovation project, scientific budget and economic evaluation of water pump equipment are an important content worthy of attention. This paper expounds that the theory of life cycle cost is an effective new way to analyze the economy of water pump equipment. On the basis of introducing the life cycle cost model of water pump equipment, it makes a preliminary analysis and design of its realization algorithm, in which it puts forward the application of BP artificial neural network to realize the calculation of some uncertain cost. Based on the theory of NPV and the concept of annuity, this paper makes a detailed budget and economic comparison example of the life cycle cost of water pump in the project planning stage, which provides a reference for the scientific purchase of equipment. The feasibility and practical significance of applying the life cycle cost theory to the economic analysis of water pump equipment are demonstrated systematically.

This study is aimed at the urban lake water environment problem in which the river network is complex and the development intensity is high. The serious water pollution problems in the urban lake, which caused by lots of point source pollution and non-point source pollution, are threatening the safety of aquatic ecosystems and human health. From the perspective of watershed water environment system, a water quality model coupled with “land surface-river network-lake” was established. The model was applied to Jinshan Lake watershed in Huizhou City, Guangdong Province to simulate the water quality of urban lakes under various water environment comprehensive remediation schemes, and to assess and analyze the improvement of urban water quality. By reducing 50% of non-point source pollutant load and 95% of point source pollutant load, the water quality of Jinshan lake can be effectively improved. Further, through 6m3/s water diversion project, the concentration of NH3-N and TP in the lake can basically achieve the goal of class IV water quality control. Compared with a single water quality model, the coupling model can simulate the main processes such as hydrology, hydrodynamics and pollutant migration and diffusion in urban lake water environment systems. The change of urban lake water quality under different point source pollutant load, non-point source pollutant load and hydrodynamic conditions is effectively reflected. By combining the distributed watershed non-point source pollution models, one-dimensional hydrodynamic water quality model of river network and two-dimensional hydrodynamic water quality model of lakes, the water quality model system provides technical support for water environment restoration of urban lakes under the impact of river network, and is expected to promote the treatment of urban black and odorous water body, and help the construction of ecological civilization.

Groundwater pollution is a very serious problem in China. It is of great significance to fast and accurately identify characteristics of groundwater sources through monitor data. Based on SCE-UA optimization algorithm, for the structure of groundwater inverse problem, combines groundwater flow numerical model, solute transport numerical model and SCE-UA optimization algorithm and design an optimization model. The numerical models simulate solute transport in groundwater and produces constraint conditions and the solution can be obtained through reflection, contraction and mutation of SCE-UA algorithm. Case studies show that this S/O model: ① with sufficient evolution generations, optimization model can effectively and accurately determine groundwater contaminant characteristics; ② the proposed identification model can fast get globally optimal solutions both to multiple pollution sources under steady-state flow and transient flow conditions, constant concentration discharges and non-constant concentration discharges.

With the rapid development of social economy and the significant improvement of human living standard, the pollution of groundwater sources is becoming increasingly serious. The scientific division of groundwater source protection zones is an effective means of protecting groundwater sources. By systematically reviewing the history of the research on the scope and method of the division of groundwater sources at home and abroad, the current mainstream groundwater division methods are analyzed, such as the empirical method, formula calculation method, analytical model method and numerical simulation method.The applicable conditions identify the limitations of each method. Based on the technical advantages of the numerical simulation method and the actual situation of the rapid development of computer technology, the measures and suggestions for the future development of the numerical simulation method are proposed. The introduction of uncertainty analysis, the complementary integration of multiple technical methods, and the cross-disciplinary integration can greatly promote the reliability and accuracy of the division of groundwater protection areas.

Sixteen rainfalls with different slopes (5 °, 10 °, 15 °, 20 °) and different rain intensities (50, 60, 70, 80 mm/h) are selected, and the slope and rain intensity are studied by using a partial least squares model. The degree of influence of rainfall duration, initial soil moisture content, and shear force on the soil erosion process on the loess slope. The results show that: ①After the logarithmization of variables, the simulation accuracy and prediction goodness of the partial least squares model are above 0.8, and the correlation coefficients of runoff rate and sediment yield are 0.844; ②VIP value shows that times, slope it is an important factor that drives the changes of runoff rate and sediment yield in the initial period of rainfall, of which times is the most important influencing factor, and the strong influence on runoff rate and sediment yield is greater. The standard regression coefficients are 0.408 and 0.341, respectively. The maximum standard regression coefficient of water content and shear force is only 0.145, indicating that both have a relatively limited impact on runoff rate and sediment yield; ③The accuracy analysis results show that the model simulation and prediction accuracy are both high, and Compared with the sand rate, the prediction accuracy of runoff rate is higher, the absolute value of the average relative error is 18.813%, and the simulation prediction effect is better.

Based on 3-year field survey data, three dimensional fluorescence spectra (EEMs) are analyzed by PARAFAC, and the vertical distribution characteristics and source of CDOM in three gorges reservoir area (baishuixi, jiuwanxi, shazhunxi and shennongxi) are analyzed.Results show that the three gorges reservoir area of DOC and POC content with similar characteristics of vertical distribution of 0 to 10 m centenarians creek, drifting at jiuwanxi, sand town creek and shennong xi DOC and POC content gradually decreased with the increase of the depth of the water, the surface layer, the largest surface sharply reduce, reduce trend area below the 3 m, 10 m of DOC and POC content basic equal.The same water depth is basically expressed as follows: 100 years old stream > nine wan stream > sand town stream > shennong stream, local fluctuations.Nutrient vertical distribution characteristics of the three gorges reservoir is relatively consistent, with 0 to 10 m centenarians creek, drifting at jiuwanxi, sand town creek and shennong xi TP, TN, NH4+ and NO3- content gradually decreased with the increase of the depth of the water, the surface layer, the largest surface sharply reduce, reduce trend area below the 3 m, 10 m in TP, TN, NH4 + and NO3 - content basic equal.The same water depth is basically expressed as follows: baisui stream > jiuwan stream > sand town stream > shennong stream, local fluctuations.The three gorges reservoir area water quality is better, overall Ⅱ - Ⅲ classes, including TLI index in performance for drifting at baisui stream > jiuwan stream > sand town stream > shennong stream, centenarians creek to eutrophication level, mainly because of the excessive concentration of N, drifting at jiuwanxi, belongs to the trophic level in the sand town creek, shennong xi belong to light eutrophication.The mean value of the comprehensive nutrition status index was 35, belonging to medium nutrition level.The CDOM absorption coefficient a(280) and a(350) of baisui stream, jiuwan stream, shazhen stream and shennong stream are all expressed as baisui stream < jiuwan stream < shazhen stream < shennong stream.Regression analysis showed that POC and DOC of baishuixi and shazzhenxi had significant linear correlation with CDOM absorption coefficient a(280) (p<0.01).Nine wanxi and shennongxi POC and DOC have significant linear correlation with CDOM absorption coefficient a(350) (p<0.01).The fluorescence index (FI) of the three gorges reservoir area ranged from 1.32 to 1.43, with an average value of 1.39, indicating that terrestrial sources accounted for the major contribution in the three gorges reservoir area.Biological index (BIX) was between 1.03 and 1.14, indicating that CDOM in the three gorges reservoir area was mainly generated by biological and bacterial activities.The humification index (HIX) was between 1.62 and 1.97, indicating that the CDOM in the three gorges reservoir area was mainly generated by biological and bacterial activities, which was consistent with the BIX index.This indicates that the CDOM in the three gorges reservoir area is derived from autogenous microorganisms, algae and other recent autogenous sources.

In order to search the water movement law in the upper reaches of Taihu Lake, this research takes Huxi District and Wuchengxiyu District as research objects, uses numerical simulation methods to study the effects of different water and rain conditions on water exchange characteristics and flow movement characteristics between the two regions, the Yangtze River, and Taihu Lake. The results show that under the existing water conservancy project dispatching operation, Huxi District is generally dominated by the Taihu Lake and Wuchengxiyu District, but the two rivers in the south of the Grand Canalin show that Wuchengxiyu District's water flows into Huxi District. At the same time, the water diversion project in Wuxi urban area and the pumping of the Meiliang Lake pumping station have raised the water level of the Grand Canal at Wuxi Station, causing the Grand Canal to leak to the east, and the upstream section of Luoshe is also supported to some extent.

There are several important national nature reserves and water function protection zones in the river and riparian of the middle Xijiang River. In order to explore the impact of landscape pattern changes on the natural ecological environment. Based on Landsat 7 and Landsat 8 satellite images, this paper calculates and analyzes the evolution characteristics of the regional characteristic values in recent years. The results show that the farmland base remains unchanged in the area, the proportion of farmland base has decreased slightly, the proportion of forestry land has decreased by 2.8%, the construction land and bare land have increased, and the proportion of water area has remained basically unchanged; the farmland and construction land's LPI has improved significantly, the water body has a higher LPI, and the other plaque LPIs have remained basically the same; artificial plaques (construction land, farmland, bare sandy land) and water edge density values (ED) have increased to varying degrees. The natural forest land edge density values (ED) have decreased, the landscape spread index (CONTAG) decreased, and the degree of fragmentation is higher; Shannon's landscape diversity index (SHDI) is small, and landscape diversity is low. Overall, it shows that the farmland cultivation efficiency and urbanization in this area have significantly improved, the degree of landscape fragmentation has increased, the quality of habitats has decreased, which is not conducive to the migration of natural organisms and the spread and migration of populations, leading to a decline in the vitality of natural ecosystems.

In order to pre-treat the slightly polluted drinking water source water in the rural areas of northwest China, the potassium ferrate-ozone pre-oxidation process was used. First, the oxidation capacity of ozone and potassium ferrate was compared. Based on the single-factor test, the response surface model was constructed based on the dosage of potassium ferrate, initial pH and slow stirring time, and the CODMn removal rate was the response value. Three independent factors and their interactions were analyzed to determine the optimal pre-oxidation process parameters. The results showed that: (1)Under the initial concentration of CODMn 8.00~10.00mg/L, ammonia nitrogen 1.3~1.5mg/L and turbidity 8.54~13.62NTU, the treatment effect of potassium ferrate on CODMn and turbidity of micro-polluted water was better than that of ozone treatment. However, the oxidation effect on ammonia nitrogen was poor. The synergy effect was better than that of potassium ferrate and ozone alone. When the dosage of potassium ferrate reached 11.5 mg/L and the dosage of ozone was 6 mg/ L, the removal rates of CODMn, ammonia nitrogen and turbidity of the system reached 67.15%, 17.43%, and 61.71%, respectively.(2)Potassium ferrate dosage, initial pH, slow stirring time were the main influencing factors of this pre-oxidation treatment, the effect on CODMn removal rate: potassium ferrate dosage > initial pH > slow Stirring time. (3)The best pre-oxidation process parameters: potassium ferrate dosage of 11.75 mg/L, initial pH of 7.74, slow stirring time of 42.72 min, and the CODMn removal rate was 72.96%. Under this condition, the actual effluent water CODMn 2.38~2.98 mg/L, which proves that the potassium ferrate-ozone pre-oxidation process is effective.

The nitrogen and phosphorus contents of the riverside slope soil of drinking water source have an important influence on water quality. Taking the Shanxi Reservoir in Wenzhou City as a study, by monitoring and sampling the soil of riverside slope, the spatial distribution characteristics of available phosphorus (AP), total phosphorus (TP), available nitrogen (AN) and total nitrogen (TN) are analyzed. One-way ANOVA and Duncan test are applied to study the spatial differences and the effects of different land use types on the spatial distribution of nitrogen and phosphorus contents. The results indicate that: ① The contents of AP, and TP of the riverside slope are higher in the Xuezoukou and tail area, while AP is higher in the near dam area. AN,TN, are higher in the Sanchaxi and Xuezuokou Area. The AN content is higher in the catchment that is away from the dam. ② The spatial differences of soil nitrogen and phosphorus contents are obvious, AP is highly variable with the highest variability, while the variability of TP, AN, and TN are moderate. ③ Land use types have significant impacts on the distribution of nitrogen and phosphorus contents. The nitrogen and phosphorus contents of bare land is low while that of shrub and weed land is high. Except for the AP of garden, the nitrogen and phosphorus contents of forest and garden were between bare land and shrub and weed land.

At present, the economic velocity of water supply pipe network is the velocity of pipe network after the minimum sum of investment cost, operation power cost and overhaul cost in China. The time value of these costs is not taken into account. Establishing mathematical models by taking the pipe network economy as the optimization goal, regarding economic velocity as the research object, the concept of time value of capital is introduced on the basis of the original cost objective function. This paper is an attempt to discuss some influence on economic velocity, including pipeline costs, the variation coefficient of pump station electricity price and electricity price. A new range of economic velocity is given in the research.

By software CFX and Workbench, a combined calculation under multiple conditions flow field and structural response of the impeller is established with two-way coupling method, based on Reynolds-averaging N-S equations, two equation RNG k-ε turbulent model and elastic structural dynamic equation, so that it can analyze the blade dynamic stress and pressure fluctuation of inlet and outlet in axial-flow pump. At the same time, it predicts the rules of the deformation and stress distribution of blade. It turs out that the maximum displacement occurred in the blade tip close to the inlet and the root displacement is very small. It appears obvious stress concentration in place close to the inlet side where the blade root and the hub touch each other. The blade stress and deformation decrease as the flow increases. The frequency of the pressure fluctuation in front of the blade inlet depends on the frequency of blade. The amplitude of design condition is minimum.

Pump stations can guarantee industrial and agricultural water. The demand for water is different in different seasons and periods. Therefore, the pump station should supply water according to real-time water demands. Firstly, this paper analyzes the operation criteria of pump stations. The minimum operating power of pumping station is selected as the criterion. The reverse sequence recursive dynamic programming method is used in the pumping station. The station optimization is carried out by taking the second stage of the general trunk of a water lifting project as an example. Compared with the actual operation, the optimization results show that the unit commitment changes. The energy consumption per unit time is reduced by 18.6%. The optimal operation mode can be found according to the demand of water and the premise of ensuring the safe operation of the pump station. It can improve the operation efficiency and reduce the operation cost of the pump station. It can create maximum economic and social benefits.

In order to test the hydraulic characteristics of the pump unit of the Tonglv Canal Water Conservancy Project, the energy characteristics test, cavitation characteristic test, flight characteristics test and test of the shaft tubular pump device are carried out. The results show that: at various blade angles, the model of the shaft cross-flow pump device runs smoothly within the normal operating head range, without obvious bad noise and vibration; at a blade angle of 0°, the critical head cavitation margin is about 1.98 m. At a maximum head of 3.70 m, the critical cavitation margin is approximately 6.29 m; within a head of 1.98 m to 3.70 m, the critical cavitation margin meets the operating requirements; the blade placement angle is -4° and the head is 3.30 m; At the time, the maximum efficiency of the pump device reached 79.03%; the unit flying speed of the shaft cross-flow pump device increases as the blade angle decreases; when the blade angle is 0° and the maximum head is 3.70 m, the maximum flying speed is the rated speed of the pump unit 2.13 times.

Wind power and photovoltaic power have the characteristics of random, dynamic and intermittent. In order to hedge the impact of large-scale grid connection of wind power photovoltaic power, it is necessary to optimize the daily operation scheme of pumped storage power plants. On the premise of prioritizing the consumption of wind power and photovoltaic power, with the goal of minimizing the mean square error of the residual load of the grid considering the operation of the pumped storage power station, the operation optimization model of the pumped storage power station is established. Then, aiming at the characteristics of nonlinear objective function, 0-1 variables and integer variables, and time-related constraints, a method for searching and optimizing the operation of pumped storage power plants based on the bidirectional load shedding method is proposed. Based on the operating data of Hubei Power Grid in 2019, the residual load characteristics of the grid after the priority consumption of wind power and photovoltaic power were analyzed, and the operation mode of the Bailian River Pumped Storage Power Station was optimized. The case results verify the feasibility and effectiveness of the proposed model and solution method.

Starting from the in-situ shear strength test on the concrete/bedrock cementation plane, the finite element numerical model of the test is established, and the distribution and development of stress, displacement and failure zone of concrete/bedrock cementation plane are analyzed under JOINT material model, Mohr-Coulomb material model, ideal elastic-plastic damage plastic model and damage plastic model considering softening respectively. The results show that ①there are some differences in the calculated shear strength parameters calculated by different material models; ②the stress distribution of the cementation calculated by different material models is roughly the same, that the stress on the cementation is unevenly distributed, and the stress concentration at the upstream and downstream ends is obvious; ③the development law of the cementation yield area calculated by different material models is roughly the same. As the external load increases, the yield area gradually develops from upstream to downstream until it penetrates the entire cementation; ④the shear strength is conservative by the average stress arrangement.

Hydraulic turbine governing system is a complex non-linear non-minimum phase system. In order to study its governing law thoroughly, this paper introduces a second-order generator dynamic model and ignores the frequency disturbance of the system based on the consideration of the non-linearity and elastic water hammer of the turbine and the non-linearity of the generator set.- Nonlinear model of mechanical-electrical combination. Taking PID parameters of governor as control parameters, the model is theoretically analyzed by direct criterion of Hopf bifurcation of six-dimensional autonomous system, and the stability region of the nonlinear system is obtained. Based on the bifurcation diagram, time domain response diagram and system trajectory diagram, the changes of the system topology structure with different governor parameters are analyzed. The results show that when the governor parameters are far away from the bifurcation point, the system can quickly converge and stabilize, which provides a theoretical basis for the setting of the control parameters and the safe and stable operation of the nonlinear turbine governing system.

It is of great significance to monitor the geological hazards along the river basin and reservoir banks. The traditional geological hazards monitoring means mainly monitor by embedding the internal and external sensors, which is difficult to obtain a large range of monitoring information, and the cost of system operation and maintenance is high. InSAR technology can quickly obtain deformation monitoring information with large range and high precision. Facing the actual needs of geological disaster monitoring along the water conservancy project in southwest China, ALOS PALSAR2 spaceborne synthetic aperture radar image data is used to make full use of the L-band penetrability of the vegetation canopy to conduct a large-scale census based on the InSAR technology on the slopes of multiple vegetation banks in this paper. At the same time, GNSS equipment is used to carry out focused monitoring of high-risk slopes obtained from the census, and GNSS monitoring results are used to verify InSAR monitoring results. According to the experimental results, the L-band spaceborne InSAR monitoring technology can be used for geological hazard monitoring of bank slopes of multi-generational banks. This paper is based on InSAR monitoring technology, combining GNSS ground monitoring technology, building from the “star-ground” integration of river bank monitoring system, can provide monitoring data in real time and accuracy, has important practical significance for ensuring the safe operation of hydraulic engineering. It is also a new way to solve the problem of disaster warning.

In order to study the dynamic constitutive characteristics of basalt fibre-reinforced loess, and analyze the reinforced mechanism from the dynamic point of view, the basalt fiber with a length of 6 mm was blended into the loess at different mass ratios. Dynamic tri-axial tests were conducted to study the effects of fiber content, moisture content and confining pressure on dynamic stress-strain relationship, dynamic elastic modulus and damping ratio of fiber loess. The test results show that:①The dynamic stress-strain relationship curves of fiber loess and unreinforced loess are strain hardening, which can be fitted by H-D hyperbolic model;②Compared with unreinforced loess, the dynamic stress of fiber loess increases with the same dynamic strain;③ Increasing the consolidation confining pressure or reducing the moisture content can increase the dynamic elastic modulus of fiber loess, but the dynamic elastic modulus is not significantly affected by the fiber content; ④The damping ratio of fiber loess can be increased by increasing the fiber content or increasing the water content in the effective interval.

Long-culvert filling and emptying system of ship lock is a sort of simple longitudinal filling and emptying system. And the flow from lateral holes is not evenly distributed in lock chambers during the filling process, which will exert a force on the ship, causing the deterioration of berthing conditions. Therefore, energy dissipaters are needed extensively. This paper, based on the numerical simulation methods, carries out a research on the baffle sill's energy dissipated mechanism and effect. The results show that setting the baffle sill could effectively reduce the flow velocity and improve the flow pattern in the lock chamber,