Analysis on Land Use/Land Cover Change of Different Slope and Impacts on Surface Runoff in Eastern Section of Upper Reaches of Hutuo River Basin
|Keywords||Hutuo River Land use / land cover SWAT model Surface runoff|
Land use / land cover change is a global change research frontier and hot . Land use / land cover change has not only changed the face of the natural landscape , but also affect the landscape material recycling and energy distribution , and its impact on regional climate , soil , water , and the water quality is profound . The hydrological effects as an important environmental effects of LUCC one LUCC research priorities and focus . Land use / land cover change alters the surface evaporation , soil moisture conditions and land cover is the interception , the impact of the initial conditions of the surface runoff , have a direct impact on the watershed hydrological processes , cumulative changes affect basin water balance . The Hutuo River upstream of the eastern section of the Shijiazhuang source of drinking water , the natural barrier of the North China Plain , the ecological environment is fragile , sensitive to environmental changes , changes in the ecological environment of the North China and the region 's land use / land cover change are closely related research significance in the area is particularly important. Distributed hydrological model SWAT to understand and reveal the impact of land use / land cover change on surface runoff mechanism has important theoretical and practical significance . Based on two remote sensing data in the study area in 1987 and 2000 , the use of RS, GIS tools and statistical methods to analyze different slope , land use / land cover change . Distributed hydrological model (SWAT model ) , followed by the use of Building Watershed database by other factors fixed , changing only the land cover to simulate different slope ( 15 ° to 25 ° gt ; 25 ° ) changes in surface runoff , and so to explore different slopes under various land cover types on surface runoff mechanism . The results show that : 1) 15 ° to 25 ° : arable land 937hm ~ 2, total study a total area of ??0.51% , runoff depth increased 0.08mm forests , grasslands of runoff depth decreases 0.18mm ; the grasslands area for 45,516 hm ~ 2, accounting for 24.56% of the total area of the study , grassland conversion to cropland runoff depth increased 1.10mm, grassland conversion the runoff depth woodland increase 2.03mm ; woodland area of ??45 516 hm to 2 , the total study a total area of ??24.56% , woodland into farmland runoff depth is reduced to 0.89mm, the conversion of forest land to grassland runoff depth decreases 0.93mm . Grassland converted to woodland runoff depth increased , followed by grassland conversion to cropland .