城市环状水系防洪潮、排涝系统治理研究

Research on the flood and tide control and the management of drainage system of the city annular river system

为探究深圳市宝安区城市环状水系防洪潮、排涝方案系统解决策略,在分析现存问题的基础上,打破现状“高水高排、低水抽排”的防洪排涝格局,确定“大片区统筹治理,小片区分散治理”为主导的治理思路。采用MIKE耦合模型建立排涝河片区和沙井河片区城市水文学模型,耦合河网模型、管网模型及坡面模型,进行精细化水文分析计算。计算结果为沙井河口50 a一遇洪峰流量247 m^(3)/s,排涝河口50 a一遇洪峰流量357 m^(3)/s,设计洪水计算成果合理。研究成果表明,该片区最优的防洪潮、排涝系统解决方案为:排涝河口新建泵站规模为100 m^(3)/s、沙井河泵站扩建规模为50 m^(3)/s、排涝河片区分散泵站规模约13.74 m^(3)/s;排涝河泵站与沙井河泵站联合调度,降低环状水系河道水位,以上方案能够达到保障区内防洪潮安全、降低区域内涝风险的研究目标。

To investigate the solution strategy of flood control and drainage system for city annular water system in Bao’an District,Shenzhen,the leading idea that the way of governance is integrated for large areas and decentralized for small areas is determined,based on the analysis of existing problems and the current situation of flood control and drainage system that high drainage for region with high altitude and pump drainage for region with low altitude is broken.The urban hydrology model of Pailao river area and Shajing river area,with coupled model of river network,pipe network and two-dimensional model are established by MIKE,and they are fine hydrological analyzed and calculated.The calculation results show that the flood peak discharge(once in 50 years)in Shajing estuary is 247 m^(3)/s,and the flood peak discharge(once in 50 years)in Pailao estuary is 357 m^(3)/s,so the calculation results of designed flood are reasonable.The optimal solution of flood control and drainage system in this area by research is:The flow scales of the newly-built pumping stations of the Pailao estuary pumping station,Shajing River pumping Station,and dispersed pumping station in Drainage estuary are 100 m^(3)/s,50 m^(3)/s,and 13.74 m^(3)/s respectively;and the drainage river pumping station and Shajing river pumping station are jointly dispatched to lower the water level of circular river system.It can achieve the research objective that ensure the safety of flood control in the area and reduce the risk of regional waterlogging.