格林—安普特下渗曲线的改进和应用

Improvement and Application of the Green-Ampt Infiltration Curve

根据干旱地区水文、气候特征和已有资料情况,把格林—安普特(Green—Ampt)下渗曲线改进为具有流域分布特征的、考虑前期降雨对下渗影响的计算公式。经黄河中游13个小流域和试验站282次实测洪水的模拟检验以及与未改进的格林—安普特下渗曲线计算结果的比较表明:改进后的下渗曲线结构合理,符合流域自然情况,产流计算精度提高较大,外延稳定、可靠。

According to the hydrologic and climatic characteristics in arid area and the available data,the Green-Ampt infiltration curve is improved into a calculating formula in which the characteristics of watershed dis-tribution is reflected and the effects of antecedent rainfall on infiltration is considered.According to verifi-cation of the improved formula with 282 observed floods in 13 small watersheds and experiment stations inthe middle Yellow River and the comparison with the results obtained by using the original curve,it isshown that the improved infiltration curve has more rational structure,conforms to the natural conditionsof watersheds.Accuracy of the calculated runoff is increased and the extrapolation is stable and reliable.