Spatial-temporal changes of river systems in Jiaxing under the background of urbanization

DENG Xiaojun;XU Youpeng;HAN Longfei;LI Guang;WANG Yuefeng;XIANG Jie;XU Guanglai;School of Geographic and Oceanographic Sciences, Nanjing University;School of Environmental Science and Resources, Guangxi Normal University;College of Territorial Resources and Tourism, Anhui Normal University;  

Based on the river system data in the 1960 s, 1980 s and 2010 s, the indicator system of quantitative description of river systems change characteristics was established, then the spatial-temporal changes of river systems and its relationship with urbanization in Jiaxing over the past 50 years was analyzed. Results indicated that:(1) Over the past half century, river systems of Jiaxing showed a decline trend. Specifically, the river development coefficient,river density and water surface ratio decreased by 58.91%, 28.94% and 14.09%, respectively.However, the degradation of the river systems varies in different urbanization stages.(2) In the whole urbanization process, the spatial differences of the changes of the river development coefficient and main river area length ratio were extremely large, and the spatial differences of the changes of the river density and water surface ratio were larger, but the spatial differences of the changes of the box dimension and river sinuosity were relatively small.(3) The decline trend of the river development coefficient, box dimension and river density was more significant in the urban area than that in the suburbs and outer suburbs, the decline trend of the water surface ratio was more significant in the outer suburbs than that in the suburbs and urban area, and the decline trend of the river sinuosity was more significant in the suburbs than that in the urban area and outer suburbs, but the spatial change trend of the main river area length ratio was insignificant.(4) The impacts of urbanization on river systems changes were extremely significant, and the changes of river systems were more drastic in higher urbanization level regions, but the impacts of urbanization on main river area length ratio and river sinuosity were larger than that on river development coefficient and river density.

【Fund】： 国家自然科学基金项目(41371046 41301029);; 水利部公益性行业科研专项经费项目(201201072 201301075);; 江苏自然科学基金项目(BK20131276)~~
【CateGory Index】： P343

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