随着经济社会的高速发展,我国许多城市的废污水排放量持续增大,引起江河湖泊污染物超标、水生态环境 日益恶化等问题,严重制约着经济社会发展。以中顺大围示范点为研究对象,从中顺大围河湖水系连通对围内防洪 调蓄、农业供水和水环境改善多个目标的影响出发,深入探索了开展中顺大围河网区水系连通的基础理论与规划关 键技术。结果表明:①当中顺大围以防洪调蓄为主要目标时,最优方案为方案 1,其平均涌容较现状少105 m3;②当中 顺大围以农业供水为主要目标时,最优方案为方案 3,其引水量较现状提升约3.81倍;③当中顺大围以水质改善为主 要目标时,最优方案为方案2和方案3,其河网整体90％换水周期较现状缩短了约58.17％;④结合当前中顺大围面 临的防洪排涝水安全、城镇化发展带来的水环境、水利工程缺乏统一调度管理等典型问题,提出相应的改进措施与建 议。研究结果可为中顺大围河涌综合整治及修复、水生态保护等工程提供重要理论依据和技术支撑。
Abstract
The discharge of waste water and sewage in many cities in China continues to increase along with the rapid economic and social development, resulting in excessive pollutants in rivers and lakes and the deteriorating water ecological environment, which in turn hinders economic and social development. The basic theories and key technologies for water system connectivity in Zhongshun Protection Demonstration Site as a case study are studied in this paper with flood control and storage, agricultural water supply and water environment improvement as targets. Results demonstrate that: 1) with flood control and storage as major target, scheme 1 is the optimal with its average inrush capacity 100 000 m3 smaller than the current situation; 2) with agricultural water supply as major target, scheme 3 is the optimal solution with the water diversion volume increasing by 3.81 times; 3) with water quality improvement as major target, scheme 2 and scheme 3 are the optimal, with 90% of the overall water exchange period shortened by 58.17%. In addition, countermeasures and suggestions are put forward corresponding to the flood control and drainage safety in Zhongshun Protection, the water environmental problem brought about by urbanization, and the lack of unified dispatch and management of water conservancy projects. The research findings offer theoretical basis and technical support for the comprehensive improvement and restoration of Zhongshun Protection, water ecological protection and other projects.
关键词
水系连通 /
防洪调蓄 /
农业供水 /
水环境改善 /
中顺大围
Key words
water system connection /
flood control and storage /
agricultural water supply /
water environment improvement /
Zhongshun Protection
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基金
国家重点研发计划项目(2021YFC3001000);广东省水利科技创新项目(2017-09);国家自然科学基金项目(51809298)
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