Impacts of land use change, water demands and climate change on water circulation of Hun River Basin in northeast China

Environmental changes influence water circulation by the ways of climate change, land use change and water demands. In order to research each factor how to affect the water circulation in Hun River Basin, such as evaporation, transpiration, infiltration, direct runoff and groundwater runoff, a distributed water cycle model was developed. Based on scenario analysis and credible model results, the research finds out (1) the land use change has limited roles in water circulation evolution in the basin; (2) water demand significantly has changed the condition of water circulation of the basin, especially changed the evapotranspiration and infiltration; (3) the water circulation in the basin has little response to the temperature increase, but large to the precipitation decrease.