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分析了在水力颗粒分异和垂直入渗两个过程用下形成的稻田土层剖面层次结构。论证了稻田土层剖面上出现非饱和流动区域的三个主要水力特征,并证明了在负压水头逐渐坛大区(A区)与负压水头逐渐减小区(B区)间存在一个压力水头梯度为零、下渗水流仅在重力作用下的层面,并以此为条件推导出下渗强度q的简化计算式。
The hierarchical structure of paddy soil profile formed under the two processes of hydraulic particle differentiation and vertical infiltration was analyzed. Three main hydraulic characteristics of non-saturated flow areas in paddy soil profile are demonstrated, and it is proved that there is a pressure between the gradually increasing alpine zone (A zone) and the gradually decreasing zone (B zone) of negative pressure head The head gradient is zero, and the seepage flow is only under the action of gravity. Based on this, a simplified calculation formula of infiltration strength q is deduced.