基于暗管排水的地下水调控模拟研究

Hydrodynamic Processes of Shallow Groundwater Regulation with Subsurface Drainage

以余姚市高效农业园区围垦区为研究对象,综合运用试验法、模拟法等研究方法,在园区基础资料收集和水文地质勘查的基础上,用Modflow建立三维地下水数学模型,定量分析不同降雨补给条件下的地下水动态变化规律;根据不同设计降雨和河道水位控制边界、不同暗管排水方案下农业园区地下水位的变化规律,分析暗管埋深、间距等与园区地下水控制的关系,确定了地下水动态排水的最佳暗管设计方案。研究表明:暗管间距15 m、埋深2.5 m能够达到精准排水控制的设计要求。还探索了浅层地下水排水规律,为精准调控不同暴雨条件下地下水位和防治围垦土地盐渍化提供决策依据。

With the help of a three dimensional mathematical model of groundwater of Modflow,the high-efficiency agriculture park in Yuyao City was chosen as study area to research the groundwater dynamic regulation under various rainfall recharges,on the basis of collecting fundamental information of the park and conducting hydro-geological investigation.According to the hydrodynamic processes of groundwater level under different designed rainfall events and water-level control boundaries in rivers as well as different pipe drainage schemes,the relationship between groundwater level regulation and depth and spacing of drainage pipes was analyzed,and then groundwater dynamic drainage system was determined.The result shows that the optimized drainage scheme is the pipe drainage system with space width 15 m and 2.5 m for depth.The drainage rule for the shallow groundwater at complex hydrogeological region was explored,which will provide scientific decisionmaking reference for groundwater level control of precision agriculture and prevention and cure of soil salinization.