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在水资源开发利用与水环境保护方面， 包气带土壤水分滞留曲线非常重要． 本文在Ｖａｎ 经验公式基础上，建立了吸湿与脱湿曲线， 将最小二乘法与非线性单纯形法相结合， 确定了４ 个待求参数的获取方法； 并探索了滞留曲线在数值模拟中的使用． 用现场试验资料检验了求包气带土壤水分特征参数方法的有效性， 同时对４ 种土质的脱湿与吸湿试验进行了模拟计算． 结果表明： 本文采用的求水分滞留曲线的方法快捷、方便， 对试验数据的模拟较好．
In the aspect of water resources development and utilization and water environment protection, soil moisture retention curve in aeration zone is very important. Based on Van’s empirical formula, this paper establishes the moisture absorption and desorption curves, and combines the least square method with the nonlinear simplex method to determine the method to obtain the four parameters to be solved. The use of retention curves in numerical simulation is also discussed . Field test data were used to verify the validity of the method for determining characteristic parameters of soil moisture in the gas zone. Simultaneously, the desiccation and moisture absorption tests of four soil types were simulated. The results show that the method of seeking water retention curve adopted in this paper is fast and convenient, and the experimental data are simulated well.