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【目的】近年来随着太湖流域圩区排涝能力建设，流域洪涝风险逐渐由圩区向圩外河道转移，圩区排涝与区域、流域防洪间的矛盾日益凸显，为缓解这一矛盾，【方法】研究提出了圩区排涝泵站的分级调度方案，并以武澄锡虞区为典型区域，采用水动力模拟的手段，对不同降雨条件下调度方案改变对洪水演进过程的影响进行了研究，将分级调度方案与现状调度、减小动力及抬高起排三种方案进行了对比分析。【结果】结果显示，减小动力方案在遭遇高强度暴雨时无法及时排涝，导致圩区发生内涝灾害；抬高起排方案在利用圩区蓄水时未能有效利用圩外河道的行洪能力，无法有效降低圩外河道洪峰水位；分析提出的分级调度方案充分利用了圩内调蓄与圩外行洪能力，同时保障了圩内、外涝风险可控。【结论】结果表明，在合理的分级方案下，分级调查可以在确保圩内洪涝灾害风险可控的前提下降低圩外河道行洪压力，实现圩内-圩外洪涝风险的动态共担。
Abstract：[Objective] With the increase of drainage capacity of polder areas in Taihu Basin, the flood risk gradually transfers from polders to outside. The contradiction between drainage of polders and flood prevention of the region and basin has become increasingly prominent. A stepwise scheduling scheme of drainage pumps is proposed in this study. Taking Wuchengxiyu region as the typical area, the influence of change of the scheduling scheme on flood process under different precipitation conditions is studied by numerical modeling. The stepwise scheme is compared with current scheme, scheme of reducing power and scheme of lifting the start-up level. Results show that in the case of reducing power, waterlogging cannot be drained in time under high precipitation intensity, which leads to waterlogging disaster in polders. In the case of lifting the start-up level, it fails to make use of the flood carrying capacity of channels outside the polders while storing water inside the polders, so that the peak level cannot be effectively reduced. In the case of the stepwise scheduling scheme of this study, both the storage capacity of polders and flood carrying capacity of channels outside the polders can be effectively used, thus decreasing the flood risk of rivers outside the polders on the premise of controlling the flood risk inside the polders, achieving the dynamic sharing of flood risk within and outside the polders.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2023.02.002
中图分类号:TU992
引用信息:
[1]丁志良,胡子琛,孙凌凯.太湖流域圩区排涝分级调度影响研究[J],2023,54(02):10-18.DOI:10.13928/j.cnki.wrahe.2023.02.002.
基金信息:
“十三五”国家科技支撑计划课题“地域性村镇建筑洪灾灾变机理与区域防洪设计理论”(2018YFD1100401);; 2019年度长江设计公司自主创新基金“城市水生态环境综合治理关键技术及应用研究”(CX2018Z04)
2022-09-13
2022
2022-09-29
2022-11-17
2022
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