IMPACT OF LAND USE CHANGE ON RUNOFF AND SEDIMENT YIELD IN THE MIYUN RESERVOIR CATCHMENT
Miyun Reservoir is an important surface water source in Beijing. Non-point source pollution has become the primary factor resulting in water quality deterioration when point source pollution was gradually controlled in the Miyun Reservoir in recent years. SWAT model, a kind of distributed hydrologic model with the ability to evaluate the effects of landuse change on hydrologic response, was set up in the Miyun Reservoir catchment First, the model was well calibrated and validated using flow and sediment data from 1986 to 1991 at Xiahui and Zhangjiafen gauge stations. Then, the land use data in 3 periods, i. e. 1990, 1995 and 2000 processed by using the GIS technique, were inputted into the well verified SWAT model to calibrated the flow and sediment. The results of model evaluation show that the land use in 1995 fluctuated greatly and impacted the flow and sediment yield. Compared with the land use in 1990, the annual flow yield and sediment yield from 1986 to 1991, which is simulated by SWAT model with the land use in 1995, decrease by 3.5 and 13.3 percentages in the Caohe watershed respectively, while it is 4. 0 and 53. 0 percentages of decrease in the Baihe watershed. This study shows that it is very important to strengthen land use management for improving the water quality in the Miyun Reservoir.
land use/cover changerunoff yieldsediment yieldSWATMiyun Reservoir
国家科技期刊平台
NSTL
万方数据
维普
