摘要
宜兴市地处太湖流域湖西地区入太湖骨干行洪通道上,汛期防洪压力较大。为解决该城区洪涝隐患,以不影响区域行洪为前提,利用流域一维河网模型模拟妥善处理上游洪水、本地涝水和南部山洪的“控泄结合”最优方案;通过外洪、山洪、本地涝水造峰时段和遭遇机遇分析,对来水条件复杂区域的抽排规模进行调洪演算。研究结果表明:①宜兴城区规划格局形成后,遇50 a一遇设计暴雨时,上游下泄洪量56%外撇出城,44%入城抽排,城区河道经新增350 m 3/s泵站抽排,最高洪水位下降88 cm,区域泄洪和城区防洪排涝安全得到保障;②不同范围的洪涝水峰值控制时段不同,一般区域洪水7~15 d、本地涝水24 d、山洪6 h,外排泵站规模应充分考虑三者峰值的合理组合,避免工程建设浪费。研究成果可为同类洪涝条件地区防洪方案制定提供参考。
Yixing City,Jiangsu Province,located in the major passage of upstream flood from western area into the Taihu Lake,is threatened with great flood control pressure in flood season.In order to solve the flood problems in its urban areas,this paper studies an optimal scheme of combination of control and discharge to properly deal with the upstream flood,local flood and southern mountain torrent by using one-dimensional river network model on the premise of not affecting regional flood discharge.Based on the analysis of peak-arriving time and encounter opportunity of external flood,mountain flood and local waterlogging,a reasonable drainage scale of the urban area is calculated and routed.The results show that:①After the formation of the urban planning pattern in Yixing City,in case of a 50-year designed rainstorm,56%of the upstream flood volume will be detoured around the city,44%still enter the city but is pumped out of the city.And according to the planning,the maximum flood level will drop by 88 cm through the newly added pumping station with 350 m 3/s pumping and drainage flow,so the regional flood discharge and urban flood control and drainage will be guaranteed.②Controlling periods of flood peaks from different areas are diverse.In general,regional flood lasts for 7~15 days,local flood lasts for 24 hours,and mountain flood lasts for 6 hours.The reasonable combination of the three peak values should be fully considered in determining the scale of the drainage pump stations to avoid cost waste in engineering construction.The research results can be used as a reference for the study of flood control schemes in urban areas with similar flood and waterlogging conditions.
作者
吴小靖
吴心艺
WU Xiaojing;WU Xinyi(Jiangsu Taihu Water Conservancy Planning and Design Institute Co.,Ltd.,Suzhou 215128,China)
出处
《人民长江》
北大核心
2023年第3期21-27,共7页
Yangtze River
基金
江苏省水利科技项目(2020008)。
关键词
城市防洪
山洪
排涝
控泄结合
宜兴市
太湖流域
urban flood control
mountain flood
drainage
combination of control and discharge
Yixing City
Taihu Lake Basin
