
Evaluation of Hydrological Situation of Minjiang River in the Past 60 Years,China
Wen-xian GUO, Hao-tong ZHOU, Li ZHANG, Xu-yang JIAO, Hong-xiang WANG
Evaluation of Hydrological Situation of Minjiang River in the Past 60 Years,China
Changes in hydrological conditions are the main factor in the function of river ecosystems. In view of the changes in the hydrological situation of the Minjiang River Basin caused by the construction and operation of water conservancy projects, the representative hydrological station, Gaochang Station at the intersection of the Minjiang Tributary Dadu River and the mainstream downstream of the Minjiang River is selected for 62 years (1956-2017) daily flow data by using the Mann-Kendall Method, Cumulative Anomaly Method, mean difference T test method, and sliding T test method to analyze flow characteristics, and consider the hydrological project construction to split the hydrological indicators before and after a sudden change, and select the ecological hydrological indicator change range method (IHA-RVA) and hydrological change degree method to comprehensively evaluate the changes in the hydrological regime of the Minjiang River, and qualitatively analyze its impact on fish in the lower reaches of the Minjiang River. The results show that from 1956 to 2017, the average annual flow of the Gaochang Hydrological Station in the Minjiang River Basin showed a downward trend; the mutation year occurred in 1993. Through the analysis of the ecological and hydrological indicators before and after the sudden change in hydrological situations, the overall hydrological change in the Minjiang River Basin is 45%. As for moderate change, the change degree of the hydrological index, the rate of decline reached 100%; the qualitative analysis of the changes in fish composition before and after the mutation shows that the types and quantities of fish resources have declined to a certain extent, which proves the series operation mode of reservoirs in the Minjiang River Basin and have a greater impact on fish diversity. This study can provide a reference for the ecological restoration and sustainable development of the Minjiang River Basin.
Minjiang / Gaochang Hydrological Station / hydrological situation / IHA-RVA {{custom_keyword}} /
Tab.1 Statistical results of annual runoff variation表1 年均流量突变统计结果 |
水文站 | 突变年份 | 变异点 | |||
---|---|---|---|---|---|
M-K突变检验 | 累计距平法 | 滑动T检验 | 均值差异T检验 | ||
高场 | 1994、1995、2000 | 1968、1973、1993 | 1968、1973、1993 | 1993、2006 | 1993 |
Tab.2 IHA index statistics table before and after abrupt change in Minjiang表2 岷江突变前后IHA指标统计表 |
IHA指标 | 中值 | 阈值 | 水文改变度/% | |||
---|---|---|---|---|---|---|
突变前1956-1973 | 突变后1974-2017 | 下限 | 上限 | |||
第一组 指标/ (m3.s-1) | 1月 | 758.5 | 836.5 | 729.2 | 778.5 | -43(M) |
2月 | 709.0 | 788.5 | 675.9 | 740.4 | -43(M) | |
3月 | 819.0 | 965.5 | 729.2 | 901.4 | -10(L) | |
4月 | 1 053 | 1 268 | 981.4 | 1 259 | -21(L) | |
5月 | 1 990 | 1 840 | 1 919 | 2 183 | -77(H) | |
6月 | 3 470 | 3 390 | 3 210 | 4 116 | -21(L) | |
7月 | 5 615 | 4 710 | 5 116 | 5 900 | -55(M) | |
8月 | 5 230 | 4 310 | 4 539 | 5 721 | -43(M) | |
9月 | 4 875 | 3 905 | 3 769 | 5 149 | -36(M) | |
10月 | 3 095 | 2 725 | 2 829 | 3 454 | -21(L) | |
11月 | 1 755 | 1 540 | 1 654 | 1 861 | -55(M) | |
12月 | 1 130 | 1 145 | 1 069 | 1 170 | -44(M) | |
第二组 指标/ (m3.s-1) | 年均1 d最小流量 | 578.5 | 598.5 | 546.4 | 607.5 | -21(L) |
年均3 d最小流量 | 601.8 | 645.5 | 580.6 | 643.4 | -55(M) | |
年均7 d最小流量 | 625.4 | 705.1 | 604.5 | 658.4 | -67(H) | |
年均30 d最小流量 | 677.2 | 760.7 | 653.9 | 716.7 | -43(M) | |
年均90 d最小流量 | 780.9 | 864.3 | 716.8 | 819.1 | -43(M) | |
年均1 d最大流量 | 16 050 | 12 950 | 14 920 | 18 200 | -47(M) | |
年均3 d最大流量 | 12 620 | 9 967 | 11 660 | 13 710 | -32(L) | |
年均7 d最大流量 | 9 877 | 7 886 | 9 184 | 11 140 | -32(L) | |
年均30 d最大流量 | 7 436 | 5 927 | 6 640 | 8 031 | -32(L) | |
年均90 d最大流量 | 5 857 | 4 802 | 5 422 | 6 216 | -43(M) | |
基流指数 | 0.227 2 | 0.290 5 | 0.212 2 | 0.245 6 | -43(M) | |
第三组 指标 | 年最小值出现时间/d | 37.5 | 38.5 | 31.0 | 50.0 | 9(L) |
年最大值出现时间/d | 212.5 | 214.5 | 208.7 | 224.3 | -21(L) | |
第四组 指标 | 低脉冲次数/次 | 4 | 8 | 3 | 6 | -43(M) |
低脉冲历时/d | 5 | 2 | 3 | 11 | -21(L) | |
高脉冲次数/次 | 8 | 10 | 7 | 9 | -38(M) | |
高脉冲历时/d | 4 | 3 | 3.935 | 7.565 | -9(L) | |
第五组 指标 | 上升率/(m3·s-1·d-1) | 141 | 130 | 125 | 160 | -21(L) |
下降率/(m3·s-1·d-1) | -108.5 | -150.0 | -120.0 | -90.0 | -100(H) | |
逆转次数/次 | 151.0 | 184.0 | 114.0 | 159.1 | -89(H) |
Tab.3 Overall hydrological change of discharge sequence表3 高场站流量序列整体水文改变度 |
水文站 | 各组水文改变度 | 整体水文改变度D 0 | ||||
---|---|---|---|---|---|---|
第一组 | 第二组 | 第三组 | 第四组 | 第五组 | ||
高场 | 43(M) | 43(M) | 16(L) | 31(M) | 78(H) | 45(M) |
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