Analysis On Effects Of Land Use And Land Cover Change On Hydrology And Water Resource In Changsha-Zhuzhou-Xiangtan Agglomeration

After the21th century, the study of global environmental change on land use change impacts increasingly focused. Land use and Land cover change effects caused by hydrology and water resources has become a hot issue and frontier areas of global change research. As the development of computers and the image resolution remote sensing improving, remote sensing technology has become an important research tool for LUCC. At the same time, the driving force is also one of the important research in LUCC. Changsha-Zhuzhou-Xiangtan Agglomeration, located in the eastern parts of Hunan Province, is the core growth pole of economic development in Hunan Province. In2007, it was approved as a comprehensive reform pilot area of national resource-saving and environment-friendly society. In Changsha-Zhuzhou-Xiangtan Agglomer-ation urbanization process accelerated, at the same time, LUCC has also undergone a lot of changes that affect the quantity and quality of urban water resources and ecological economy is increasingly displayed. Therefore, to study effect of hydrology and water resources of Changsha-Zhuzhou-Xiangtan Agglomeration LUCC, for rational utilizati-on of land and water resources allocation, optimization of regional land, provide the basis for scientific planning.Changsha-Zhuzhou-Xiangtan Agglomeration is divided into plough, Forest land, waters, construction land and unused land by ENVI4.5and ARCGIS10.0. It sets up transfer matrix of land use types and single land use dynamic degree. To analysis the driving force of Changsha-Zhuzhou-Xiangtan Agglomeration LUCC according to the natural, social and economic situation. Finally, it calculates different land use types evaporanspiration by building a lumped watershed hydrological model. Selecting the2000-2005and2006-2010land cover conditions and corresponding runoff by using the method of hydrological characteristics parameters. Conclusions are as follows:(1) Land use/change:From2000to2010, water and the construction area is a growing trend. And cultivated, forest and unused is a decreasing trend. And the dynamic of the construction land is the largest. In the type of conversion in the city, because of increased demand, cultivated land, forest land and water to construction land conversion rate is relatively more. At the same time, construction land, unused land to cultivated land, forest land and high conversion ratio, which is consistent with the protection of cultivated land and ecological protection central issued.(2) Effect of hydrology and water resources:By lumped watershed Hydrological model, come to different land use types evaporanspiration size relationship Xiangjiang River in Changsha-Zhuzhou-Xiangtan Agglomeration:plough land> Forest land> Unused land> Construction land. Water balance factor of0.9957; Runoff with a pass rate of99.5%。 Selecting runoff coefficient as the important hydrological characteristics parameters. On the basis of Changsha-Zhuzhou-Xiangtan Agglomeration different land use change speed from2000to2010, coming to the result of Changsha-Zhuzhou-Xiangtan Agglomeration runoff coefficient fluctua-te from2000to2010. The runoff is decreasing and the evaporation is increasing. And the ability of runoff basin is decreasing. Forest land cover have more quantity from2000to2005than2006to2010. Influencing of precipitation on runoff is stabling from2000to2005. As the result of increasing of plough land, forest land and the decreasing of construction land from2006to2010. Changsha-Zhuzhou-Xiangtan Agglomeration precipitation and runoff is correlating significantly. And the runoff is largely fluctuating.