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沙丘前沿区因其特定的下垫面和水文气象条件,降雨径流关系表现出一定的特殊性。通过对历史水文资料和水文试验数据研究,初步分析了沙丘前沿区产流汇流特性,并利用新安江模型进行次降雨径流模拟,验证了特性分析结论。沙丘前沿区在产流上表现为局部地表径流、全面稳定地下径流的特殊的蓄满产流形式;地下水是汇流过程的主水源,地下含水层调节作用明显,洪水过程拖长,地表径流形成洪峰,地表产流面积比重小且不固定,汇流时间短,峰现时间相对提前但峰值小。
Due to its specific underlying surface and hydrological and meteorological conditions, the frontal area of dune shows a special characteristic of rainfall-runoff relationship. Through the research on historical hydrological data and hydrological test data, the characteristics of runoff and confluence in the foreland area of dune are analyzed preliminarily, and the runoff simulations by Xinanjiang model are carried out to verify the conclusion of characteristic analysis. In the front of dune area, the surface runoff appears on the runoff and fully stabilizes the special runoff form of the subsurface flow. Groundwater is the main source of confluence, and the adjustment effect of the underground aquifer is obvious. The flooding process prolongs and the surface runoff forms a peak , The proportion of surface runoff area is small and not fixed, confluence time is short, peak time is relatively early but the peak is small.