|Water Science and Engineering 2020, 13(4) 253-264 DOI: https://doi.org/10.1016/j.wse.2020.12.004 ISSN: 1674-2370 CN: 32-1785/TV|
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Change of stream network connectivity and its impact on flood control
Yu-qin Gao a, *, Yun-ping Liu a, Xiao-hua Lu a, b, Hao Luo c, Yue Liu a
a College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Urbanization can alter the hydrogeomorphy of streams and rivers, change stream network structures, and reduce stream network connectivity, which leads to the decrease in the storage capacity of stream network and aggravates flood damages. Therefore, it is of great importance to investigate how stream network connectivity impacts flood storage capacity and flood control in urbanized watersheds. This study proposed a framework to assess stream network connectivity and its impact on flood control. Firstly, a few connectivity indices were adopted to assess longitudinal stream network connectivity. Afterward, the static and dynamic storage capacities of stream network were evaluated using storage capacity indices and a one-dimensional hydrodynamic model. Finally, the impact of stream network connectivity change on flood control was assessed by investigating the changes in stream network connectivity and storage capacity. This framework was applied to the Qinhuai River Basin, China, where intensive urbanization occurred in the last several decades. The results show that stream network storage capacity is affected by stream network connectivity. Increasing stream network connectivity enhances stream network storage capacity.
|Keywords： Stream network connectivity Static storage capacity Dynamic storage capacity One-dimensional hydrodynamic model|
|Received 2020-03-24 Revised 2020-09-26 Online: 2020-12-30|
This work was supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20181310) and the National Natural Science Foundation of China (Grant No. 52079039).
|Corresponding Authors: Yu-qin Gao|
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