Author(s): Zhongxi Xia; Shanghong Zhang; Eerdun
Linked Author(s):
Keywords: SWAT Model; Hydrological effects; Land Use and Cover Changes; Lantsang River Basin
Abstract: The quantitative analysis of hydrological effects of land use and cover change is the basic work of ecological rehabilitation and reconstruction, meanwhile distributed hydrological model is the main tool for quantitative analysis. To explore the role of different land use scenarios on ecological reconstruction, using SWAT modeling the Lantsang River Basin in Yunnan Province, through runoff and sediment data to verify the applicability of the model, then extracted and analyzed the percent of land use type and gradient of farmland. Study used space data of Lantsang River Basin and little of the hydrological and meteorological data to simulate the annual mean rainfall, runoff and sediment of the entire basin, which provided decision support for integrated river basin management, then analyzed the soil erosion of sub-basin and found that the whole basin is moderate erosion while some sub-basins in the downstream are Severe erosion. To study the influence of land use and cover change with gradient on runoff, sediment, evapotranspiration and soil erosion, restoring the 15°-25°farmland and above 25°farmland to forest and grass respectively, the results of different scenarios show that most of farmland in 15°-25°, therefore returning farmland to forest or grass in this gradient is more favorable to ecological reconstruction than other gradient, furthermore the soil and water conservation capacity of woodland is greater than grassland. The results of study highly consistent with the results of previous studies show that the SWAT model not only successfully models the Lantsang River Basin, provides an important way for the quantitative analysis of hydrological effects of land use and cover change.
Year: 2013