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[Simulation of hydrological response to land-cover changes].

Hydrological modeling methodology had a quick development in recent years. In this article, a distributed hydrological model SWAT was used to simulate the rainfall-runoff relationship of the Suomo Basin under different land covers in order to evaluate the impact of land-cover changes on runoff, evapotransperation and peak flow. The results showed that if the land-cover changed from non-vegetation-cover to full-forest-cover scenarios, the runoff depth decreased, evaporation increased, while the reduced extent of runoff in dry season was less than that in rainy season, and in the first rainy season, the reduced extent of runoff was more than that in the second rainy season. With the same recurrent flood flow, the peak flow value under full-forest-cover scenario was 31.2% less than that under non-vegetation-cover scenario. The effect of land-cover between current cover and optimum cover on hydrology was small for large storm, and big for small storm events.