淮北平原区干沟控制排水技术及效应

Study on the technique and effect of controlled drainage through the main drainage ditch

针对目前该地区水资源开发利用、农田水利工程发展现状及存在问题,利用两处总面积218km2的控制排水原型试验区,采用现场观测和理论模拟分析相结合的研究方法,系统地研究了干沟控制排水对农田排水、地下水动态的影响及对降雨径流、地下水资源的调控作用等关键技术问题。结果表明该项技术具有调控地下水位、增加作物对地下水的利用、调节水资源时空分配等作用,基本上不影响干沟的农田排水,是目前淮北地区农田水利发展的方向性措施。成果已在安徽淮北平原区得到较广泛的推广应用,取得了良好的社会经济效益和生态环境效益,对类似地区的控制排水工程建设和农田水资源的调控有参考价值。

Using main ditch for farmland drainage is a basic measure to solve waterlogging problem in Huaibei Plain of Auhui Province. However, uncontrolled drainage often results in serious waste of water resources. In the present study, we established two experimental zones （Bazhang Ditch, Chezhe Ditch） with the total area 218km2. Based on the field observations combined with theoretical simulation analysis, the key techniques were studied systematically such as the effect of main ditch control projects on farmland drainage, groundwater depth, rainfall-runoff and groundwater resources regulation in the two zones. The results show that the controlled drainage of main ditch could regulate groundwater depth and increase the groundwater utilization, improving farmland ecological environment and regulating water resources allocation in time and space. In addition, it didn’t influence the farmland drainage. This technique has been widely applied in Huaibei Plain and achieved good social, economic and environmental benefits. It can be used as a reference for the construction of control drainage project and regulation of farmland water resources in similar areas.