【摘要】 暗管排水是高地下水埋深地区农田排水的主要方式之一。【目的】确定农田暗管-明沟组合排水系统的布设参数。【方法】根据农田排水理论,建立了农田暗管-明沟组合排水系统布设参数计算模型及其C#语言编程。【结果】在题设条件下,考虑地下水蒸发影响时的吸水管间距比不考虑其影响可增大2.9%~17.3%;吸水管间距由15 m增大到25 m时,地下水埋深降深减小24.7%~27.5%;当吸水管埋深由1.5 m增加到2.0 m时,地下水埋深降深可增大34.8%。计算结果与相关算例的最大相对差异小于1.2%,运行速度快,在5 s内可以完成计算过程,适用于不同土壤质地、地下水埋深、地下水蒸发条件和作物种植条件。【结论】设计的软件减轻了农田水利工程基层设计人员的工作量,可以进一步推广。更多还原

【Abstract】 【Objective】Subsurface drain is a common drainage technique to keep groundwater table below a critical depth. The purpose of this paper is to present a model and computer program to help design subsurface drain and open ditch as a hybrid drainage system for farmland.【Method】The model was based on hydrodynamics of soil water and considered both drainage and evaporation; the water flow was solved numerically.【Result】For the cases we studied, considering evaporation allowed the distance between adjacent drains to increase by 2.9%~17.3% compared with scenarios without evaporation; increasing the drain-drain distance from 15 m to 25 m reduced the groundwater table drawdown by 24.7%~27.5%. Increasing the depth of the drain from 1.5 m to 2.0 m enhanced the groundwater table drawdown by 34.8%. Comparison with the literature results showed that the maximum relative errors of the model simulations was less than 1.2%. The code ran fast and, in most circumstances,could give the final results in less than 5 seconds.【Conclusion】The model and the software we developed can be used as a tool to design drainage systems to control soil salinity and to ameliorate waterlogging.更多还原