| 太湖平原河网区城镇化发展与水系变化关系 |
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| 引用本文： | 徐羽,许有鹏,王强,吴雷,杨金艳,施红怡.太湖平原河网区城镇化发展与水系变化关系[J].水科学进展,2018,29(4):473-481. |
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| 作者姓名： | 徐羽 许有鹏 王强 吴雷 杨金艳 施红怡 |
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| 作者单位： | 1.南京大学地理与海洋科学学院, 江苏 南京 210023; |
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| 基金项目： | 国家重点研发计划资助项目（2016YFC0401502）；国家自然科学基金资助项目（41771032） |
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| 摘 要： | 选取太湖流域下游的武澄锡虞和阳澄淀泖水利片区为研究区，基于1980s和2010s两期水系和土地利用类型数据，利用全局自相关、局部自相关和地理加权回归模型等方法，分析河网密度空间变化特征，并探讨其与土地城镇化的关系。结果表明:近30年研究区河网密度下降幅度达11.3%，其中，一、二级支流密度分别下降18.1%和11.3%。城市及周边地区下降幅度最大；因淤积和填埋造成的区域河道衰退是河网密度下降的主要原因；土地城镇化速度与支流衰减长度呈指数关系，且存在区域差异；当土地城镇化速度达40%以上时，支流长度快速减少。此外，水网密布区域河网密度下降和衰退强度更大。因此，在城市建设过程中需要加大对水系的保护力度。
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| 关 键 词： | 河网密度 河道衰退 空间尺度 土地城镇化 太湖流域 |
| 收稿时间： | 2018-03-21 |
Relationship between urbanization and river network change in Taihu Lake basin,China |
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| XU Yu,XU Youpeng,WANG Qiang,WU Lei,YANG Jinyan,SHI Hongyi.Relationship between urbanization and river network change in Taihu Lake basin,China[J].Advances in Water Science,2018,29(4):473-481. |
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| Authors: | XU Yu XU Youpeng WANG Qiang WU Lei YANG Jinyan SHI Hongyi |
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| Institution: | 1.School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;2.Suzhou Branch of Jiangsu Province Hydrology and Water Resources Investigation Bureau, Suzhou 215006, China;3.Jiangsu Province Water Resources Department, Nanjing 210029, China |
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| Abstract: | Evaluating the impact of urbanization on changes in river systems is crucial for urban planning and protecting river systems. We selected the Wuchengxiyu and Yangchengdianmao hydrological zones in the lower Taihu Lake basin as regions of study. We compared river system data and land use types from the 1980s and 2010s to identify changes in river system patterns and measure how these changes were related to land urbanization. To measure this relationship, we used global and local autocorrelation analyses and a Geographically Weighted Regression model. The results indicate that drainage density decreased at a rate of 11.3% over the last 30 years in area of study. The 1st-and 2nd-order tributary density decreased at the rate of 18.1% and 11.3%, respectively. The most drastic decreases were observed mainly around large cities. The intensive degradation of the river system, caused by deposition, landfill and annexed by the lakes were the main reasons for the decrease in drainage density. The degradation of tributaries had an exponential relationship with the velocity of land urbanization:the rate of decrease in tributary length accelerated when the land urbanization reached 40%. In addition, the intensity of river system variation and recession increased in regions with greater river density. Thus, more attention should payed to the protection of river systems during rapid urbanization. |
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| Keywords: | river system density river system degradation spatial scale land urbanization Taihu Lake basin |
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