以江苏省南通市通州区为例,分别采用“4种下垫面”与前期影响雨量经验公式法两种模型计算水资源量,并对计算结果进行了对比分析。结果表明,丰水年与平水年两种模型的径流量结果相近,极值分布基本一致,下垫面条件对地表水资源量及地下水资源量影响明显,“4种下垫面”模型的计算结果更符合实际情况。 Taking Tongzhou District, Nantong City, Jiangsu Province as an example, the authors calculated the amount of water resources using two models of “four kinds of underlying surfaces” and the empirical formula method of rainfall impact respectively, and compared the calculated results. The results show that the results of runoff of the two models are similar in the wet years and the plain years, and the distribution of the extreme values ​​is basically the same. The underlying surface conditions have obvious effects on the amount of surface water resources and groundwater resources. The “four kinds of underlying surfaces” model The calculation results more in line with the actual situation.