【摘要】 本文提出了推算畦灌水流推进过程的一个数学模型。田间试验表明,该模型的平均误差小于4％,最大误差小于10％。根据这个模型,文中还提出了计算改水成数和畦长的公式。更多还原

【Abstract】 A mathematical model was presented for predicting the advancing ghrase of the border irrigation water.Field experiments indicated that the average errors of the model were less than 4%,and that the maximum errors were less than 10%. Based on this model,the formulas for predicting water cutoff ratio and the length of border were proposed in this paper.更多还原