Abstract:

The Jianghan plain is the important grain base in our country and the heart of Wuhan urban agglomeration.Understanding the impact of regional land use change on watershed hydrology help to making landuse planning policies and providing decision support for the sustainable development of water resources.This study calibrated the data during 2000-2004 and validated the data during 2005-2009 to structure SWAT model,and used this model to simulate monthly and yearly main runoff in the region.Then by means of double mass curve,the effect of human activities in main rivers of the Jianghan plain on disturbance of runoff was studied,and the changes of runoff under simulated scenarios between 1980 and 2010 were also comparatively analyzed.The results showed that model validation could be better simulated runoff in the Yangtze River and the Hanjiang river basins in the region.As the decrease of rainfall，the effect of land use change on runoff was increasing.Impacts of human activities during 1990-1995 on runoff were mainly reflected on the reducing forest land and inputs in the water conservancy facilities.After 2000,land use particularly the increase of construction land use increasingly impacted on runoff