Impacts of urbanization on river system structure: a case study on Qinhuai River Basin, Yangtze River Delta.
Impacts of urbanization on river system structure: a case study on Qinhuai River Basin, Yangtze River Delta.
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DOI：
10.2166/wst.2014.278
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
Xiaomin Ji;Youpeng Xu;Longfei Han;Liu Yang
中科院分区：
文献类型：
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作者：
Xiaomin Ji;Youpeng Xu;Longfei Han;Liu Yang
河流结构通常在短期内受到各种人类活动的控制。基于遥感影像和地形图，利用ArcGIS软件分析了1979 - 2009年秦淮河流域河流结构的变化。列出了一系列由河流地貌学推导出的河流参数，用以描述过去和现在的河流结构状况。结果表明，城市化导致不透水面积大幅增加。研究区河流数量减少，河流长度缩短。30年来，河流长度减少了41.03%。河流的复杂性和稳定性也发生了变化，因此，城市化程度较高地区的河道蓄水能力远低于中等城市化地区，这表明发生洪水的风险更大。因此，城市对河流的干扰应引起高度重视。
Stream structure is usually dominated by various human activities over a short term. An analysis of variation in stream structure from 1979 to 2009 in the Qinhuai River Basin, China, was performed based on remote sensing images and topographic maps by using ArcGIS. A series of river parameters derived from river geomorphology are listed to describe the status of river structure in the past and present. Results showed that urbanization caused a huge increase in the impervious area. The number of rivers in the study area has decreased and length of rivers has shortened. Over the 30 years, there was a 41.03% decrease in river length. Complexity and stability of streams have also changed and consequently the storage capacities of river channels in intensively urbanized areas are much lower than in moderately urbanized areas, indicating a greater risk of floods. Therefore, more attention should be paid to the urban disturbance to rivers.