水阳江流域(宣城段)土地利用变化的水文响应分析

Study on hydrological response to land-use change in Shuiyang River Basin(Xuancheng section)

以安徽水阳江流域(宣城段)为例,利用SWAT模型中国大气同化驱动数据集(China meteorological assimilation driving datasets for the soil and water assessment tool(SWAT)model,CMADS)驱动SWAT模型对2010—2017年月径流过程进行模拟和验证,并分析“林长制”背景下的水文响应。模拟结果表明:CMADS数据集在研究流域适用性良好且模型不确定性低;在流域内近年土地利用变化较大的区域内设置不同比例耕地或草地转化为林地的12种不同水文情境,结果表示,在12种情境下,流域蒸散发和深层渗透均增加,地表产流均减少。推行“林长制”对流域水资源可持续利用有重要意义。

The monthly runoff process from 2010 to 2017 in the Shuiyang River Basin(Xuancheng section) in Anhui Province is simulated and verified by the China meteorological assimilation driving datasets for the soil and water assessment tool(SWAT)model(CMADS), and the hydrological response to land use change is explored under the background of forest chief system. The simulation results show that the CMADS model has good applicability and low model uncertainty in the study basin. The evapotranspiration and deep infiltration increased, while the surface runoff decreased in 12 different hydrological situations in which different proportion of cultivated land/grassland is converted into forest land in areas with great land use changes in the basin. The implementation of forest chief system is of great significance to the sustainable utilization of water resources in river basins.