
Recent Erosion and Deposition Patterns and Countermeasures for Flood Control in Shenzhen River
Zhi-yong FENG, Yong-yan WU, Lei WANG, Zhi YIN, Guang-yue ZHANG, Guang-ming TAN
Recent Erosion and Deposition Patterns and Countermeasures for Flood Control in Shenzhen River
The channel morphology and flood control capacity of Shenzhen River have changed significantly in the past decades owing to the Shenzhen River Regulation Project and river basin urbanization. Based on measured water, sediment, and bathymetric data, this paper systematically analyzes the recent erosion and deposition patterns of Shenzhen River and the changes of flood control capacity in Shenzhen River and its back-siltation characteristics after the implementation of different channel dredging schemes is explored by using a two-dimensional numerical model of flow and sediment. The results show that significant back-siltation occurred in Shenzhen River during 2007-2017, with an accumulated deposition volume of 74.6×104 m3. The morphological changes featured alternate channel erosion and deposition and consistent shoal deposition, with the magnitude of erosion and deposition gradually decreased from the upstream to the downstream. The reduced sediment transport capacity after the implementation of the Shenzhen River Regulation Project was the main reason of recent rapid deposition in Shenzhen River, and the deposition rate was associated with the flood tide discharge at the river mouth and the upstream sediment load. The flood control capacity of Shenzhen River decreased owing to channel deposition, the proportion of river section on the sides of Shenzhen and Hong Kong that currently meet the 50-year return period of flood control capacity are 63.2% and 56.8% respectively. Modeling results show that the improvement extent of flood control capacity of different channel dredging schemes is positively correlated with their back-siltation amount. The optimization suggestion for the improvement scheme of the flood control capacity of Shenzhen River is therefore given from the view of benefits of flood control and economic costs.
Shenzhen River / channel deposition / flood control capacity / numerical model {{custom_keyword}} /
Fig.3 Erosion and deposition patterns of Shenzhen River from 2007 to 2017图3 2007-2017年间深圳河冲淤变化过程 |
Tab.1 Sediment volume changes of different reaches in Shenzhen River from 2007 to 2017表1 2007-2017年间深圳河不同河段的冲淤量计算 |
河 段 | 时期 | |||||
---|---|---|---|---|---|---|
2007-2009 | 2009-2011 | 2011-2013 | 2013-2015 | 2015-2017 | ||
一、二期工程河段 | 冲刷占比/% | 26.6 | 26.4 | 45.6 | 34.7 | 57.6 |
冲刷体积/万m3 | -6.6 | -7.6 | -18.0 | -11.6 | -55.0 | |
淤积占比/% | 73.4 | 73.6 | 54.4 | 65.3 | 42.4 | |
淤积体积/万m3 | 34.2 | 30.4 | 19.4 | 30.2 | 22.2 | |
三期工程河段 | 冲刷占比/% | 4.6 | 5.3 | 27.5 | 52.1 | 22.7 |
冲刷体积/万m3 | -0.2 | -0.2 | -1.6 | -2.2 | -0.8 | |
淤积占比/% | 95.4 | 94.7 | 72.5 | 47.9 | 77.3 | |
淤积体积/万m3 | 18.0 | 13.0 | 4.4 | 2.0 | 4.0 | |
整个区域 | 冲淤体积/万m3 | 45.6 | 35.8 | 4 | 18.6 | -29.4 |
速率/mm | 287.0 | 226.0 | 25.4 | 117.0 | -185.0 |
Tab.2 Dredging area and amount of different dredging schemes表2 不同清淤方案的实施范围和清淤幅度 |
清淤方案 | 清淤范围/m | 清淤量/万m3 | 清淤深度/m | |
---|---|---|---|---|
短距离河段大幅度清淤 | F1 | 0~1 900 | 50.0 | 1.57 |
F2 | 1 900~3 800 | 50.0 | 1.85 | |
F3 | 3 800~6 000 | 50.0 | 1.65 | |
F4 | 6 000~8 500 | 50.0 | 1.81 | |
F5 | 6 900~9 500 | 50.0 | 1.95 | |
F6 | 9 500~13 465 | 50.0 | 2.74 | |
长距离河段小幅度清淤 | F7 | 1 500~5 000 | 50.0 | 1.00 |
F8 | 3 300~8 000 | 50.0 | 0.83 | |
F9 | 5 000~9 500 | 50.0 | 1.00 | |
全河段清淤 | F10 | 0~13 465 | 69.4 | 0.48 |
F11 | 0~13 465 | 138.8 | 0.96 | |
F12 | 0~13 465 | 208.2 | 1.45 |
Tab.3 Calculation of back-silation volume of dredged reach after one year of implementing different dredging schemes表3 不同清淤方案实施一年后清淤河段的回淤量 |
清淤方案 | 清淤量/万m3 | 回淤量/万m3 | 回淤率/% | |
---|---|---|---|---|
短距离河段大幅度清淤 | F1 | 50.0 | 31.9 | 63.8 |
F2 | 50.0 | 29.9 | 59.8 | |
F3 | 50.0 | 24.5 | 48.9 | |
F4 | 50.0 | 15.6 | 31.3 | |
F5 | 50.0 | 16.2 | 32.4 | |
F6 | 50.0 | 10.7 | 21.5 | |
长距离河段小幅度清淤 | F7 | 50.0 | 29.7 | 59.5 |
F8 | 50.0 | 23.8 | 47.6 | |
F9 | 50.0 | 19.2 | 38.3 | |
全河段清淤 | F10 | 69.4 | 30.0 | 43.2 |
F11 | 138.8 | 43.4 | 31.3 | |
F12 | 208.2 | 54.6 | 26.2 |
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