有蒸发作用时田间排水沟（管）间距的简化计算  

Simplified Calculation of Field Drains Spacing in Evaporation Condition

作　　者：张友义[1] 

机构地区：[1]中国水利水电科学研究院

出　　处：《中国农村水利水电》1996年第5期9-11,共3页China Rural Water and Hydropower

摘　　要：对于有蒸发作用时的农田地下排水渗流计算，作者曾用复化梯形数值积分法取得了通用解答，但计算步骤烦琐。文章采用平均降速法获得的简化公式，不仅操作简便，而且具有判断是否需设地下排水沟（管）之功能。经大量算例的结果比较，相对误差在±７％以内者近９４％，具有较高的实用性。For the seepage flow calculation of field underground drains in evaporation condition, a popular solution was obtained by using of the complex trapezoid digital integration by author, but the calculation formular developed by average decline rate in this paper is not only easy to operate but also has the function to judge if it is necessary to set underground drains. The relative errors within±7% reachs to 94% by comparisons of large amount of calculating examples and has a higher practicality.

关 键 词：蒸发作用 排水沟 平均降速法 

分 类 号：S276.1[农业科学—农业水土工程]