RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (03): 402-409.doi: 10.11870/cjlyzyyhj201703010

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CHANGE OF RIVER STRUCTURE AND RIVER NETWORK CONNECTIVITY IN THE PLAIN RIVER NETWORK AREA

ZHOU Feng1, LV Hui-hua1,2, XU You-peng2   

  1. 1. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China;
    2. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China
  • Received:2016-08-10 Revised:2016-12-13 Online:2017-03-20
  • Supported by:
    National Natural Science Foundation of China (41401035, 4150103);Commonweal and Specialized Program for Scientific Research, Ministry of Water Resources of China ((201301075);Natural science fund for colleges and universities in Jiangsu Province ((l4KJB170021)

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Abstract: Change of river system and its impact on flood is one of the hot spots in hydrological studies especially in plain river network region. In the present study, river structure and river network connectivity was analyzed in the coastal areas of East Zhejiang Province under the rapid urbanization. The result showed that drainage density and water surface rates were declined by 20% and 30% respectively during the past 20 years, and that drainage channel was in a more simple way due to the decline in river. The river network connectivity was evaluated based on the hydraulic resistance and Shortest Path Analysis, and the result indicated that river connectivity showed an increasing trend after the first reduction while the river system had a monotonic decreasing, and result from the construction of main channel which would decrease the negative impact of water debilitating on flood risk. The above assessment method was successfully applied to the study area and provided a feasible and effective way to analyze the change and spatial difference in the river connectivity.

Key words: stream structure, river network connectivity, plain river network, urbanization

CLC Number: 

  • K903
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