水循环模型
（1）蒸发子模型：
式中，m为年内月序号；Nm为各月与日照有关的调整因子；Tm为月平均温度；I为年热量指标。
（2）土壤水分子模型：
式中，fi （P-PE，SMC，L）表示当降水量小于蒸发量（P-PEi<0）并且土壤含水量小于土壤持水量（STi<SMC）时，土壤含水量STi是降水量与蒸发潜力之差（P-PE），土壤持水能力SMC和土壤特征曲线L的函数；STi-1+P-PEi表示当降水量大于蒸发量（P-PEi>0）并且土壤含水量小于土壤持水量（STi<SMC）时，土壤含水量STi等于前期土壤含水量STi-1加上降水量与蒸发潜力之差（P-PE）；STi-1+Pi表示当降水量大于0而温度小于0（Pi>0和Ti<0）时，土壤含水量STi等于前期土壤含水量STi-1加上降水量（Pi）。
参考文献：
林耀明：赣江流域的水循环模型。资源科学，1998，20（增刊）
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