【摘要】 本文根据地下水蒸发试验资料,利用地下水动力学理论,提出了考虑蒸发影响下按地下水位下降速度标准进行田间排水沟(管)间距的计算方法.并利用室内外排水试验资料,通过对地下水位在纯蒸发、纯排水和两者同时作用条件下的下降速度及其特征值的分析,也得到了与上述理论分析结果完全一致的间距计算方法. 本文还根据排水过程中土壤剖面内的盐量平衡关系,得到了排水地段内地下水位降落全过程中排出水量与蒸发水量比值(简称排蒸比)的计算式,从而提出了按排蒸比标准进行田间排水沟(管)间距的计算方法.这种方法考虑了蒸发影响和脱盐要求,是一种新的探索和尝试。更多还原

【Abstract】 According to the field observation and model test data of ground water drawdown speed and the ratio of drainage water quantity and evaporation, by using the theory of ground water seepage, a new method for determining the field drain spacing is advanced. In this method the influence of evaporation from ground water and the requirement of desalinization of soil is considered.According to the drawdown speed requirement, the drain spacing may be determined by means of equations(11)～(28).According to the ratio of drainage water quantity and evaporation, the drain spacing may be determined by means of equations(33)～(43).The calculating method for determining the field drain spacing in consideration of the influence of evaporation and desalinization requirement , as shown in this paper, is a new test and to be verified by further study and observation.更多还原