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引用本文:孙延伟,许有鹏,高斌,王强,李升峰.城镇化下流域不透水面扩张对洪峰的影响——以南京秦淮河为例.湖泊科学,2021,33(5):1574-1583. DOI:10.18307/2021.0515
Sun Yanwei,Xu Youpeng,Gao Bin,Wang Qiang,Li Shengfeng.Influence of impervious surface expansion on flood peak under urbanization—A case study of Qinhuai River in Nanjing. J. Lake Sci.2021,33(5):1574-1583. DOI:10.18307/2021.0515
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城镇化下流域不透水面扩张对洪峰的影响——以南京秦淮河为例
孙延伟, 许有鹏, 高斌, 王强, 李升峰
南京大学地理与海洋科学学院, 南京 210023
摘要:
长江下游秦淮河流域近年来由于城市化崛起导致不透水面迅速扩张,改变了流域水文过程,导致暴雨洪水灾害风险增大.本文以南京秦淮河流域为例,基于1988-2015年间下垫面和水文气象资料建立了流域水文模型,通过不透水面扩张情景分析,探讨了1988-2015年间不透水面空间扩张及对流域洪水过程的影响.研究结果表明:(1)秦淮河全流域1988-2015年不透水率从3.92%增长到19.11%,且不同区域扩张速度有所差异;(2)2006-2015年不透水面情景下的洪峰流量平均涨幅大于城市化初期;受流域上下游位置和下垫面地形条件的影响,流域溧水河和句容河两河源处的不透水面变化对洪峰的影响较流域下游出口处更显著;(3)秦淮河流域及不同位置的不透水面扩张情景下,小洪水的洪峰响应均大于大洪水,且不透水面扩张发生在下游主干河流域时的大、小洪水洪峰涨幅差距略大于河源流域.
关键词:  洪峰流量  不透水面  空间分布  城市化  秦淮河流域
DOI:10.18307/2021.0515
分类号:
基金项目:国家重点研发计划项目(2018YFC1508201)、国家自然科学基金项目(41771032,41771029,41371044)和江苏省水利科技项目(2019028)联合资助.
Influence of impervious surface expansion on flood peak under urbanization—A case study of Qinhuai River in Nanjing
Sun Yanwei, Xu Youpeng, Gao Bin, Wang Qiang, Li Shengfeng
School of Geography and Ocean Sciences, Nanjing University, Nanjing 210023, P. R. China
Abstract:
In recent years, the impervious surface of Qinhuai River Basin in the lower reaches of the Yangtze River has expanded rapidly due to the rise of urbanization, which has changed the hydrological process of the basin and increased the risk of rainstorm and flood disasters. This paper takes the Qinhuai River Basin of Nanjing as an example, establishes a watershed hydrological model based on underlying surface and hydrometeorological data from 1988 to 2015. Through the analysis of impervious surface expansion scenarios, the spatial expansion of impervious surface from 1988 to 2015 and their impact on the flooding process of the basin is discussed. The research results show that: (1) The impervious rate of Qinhuai River Basin increased from 3.92% to 19.11% from 1988 to 2015, and the expansion speed is different in different regions; (2) The average increase of flood peak discharge under impervious surface scenarios from 2006 to 2015 was greater than that at the beginning of urbanization; Affected by the location of the upper and lower reaches of the basin and the terrain conditions of the underlying surface, the impact of impervious surface changes at the headwaters of the Lishui River and Jurong River on the flood peak discharge is more significant than that at the outlet of the downstream; (3) Under impervious surface expansion scenarios of Qinhuai River Basin and different locations, the flood peak discharge response of small floods is greater than that of large floods, and when the impervious surface expansion occurs in the main downstream basin, the difference between the peak increase of large and small floods is more significant than that at the headwaters.
Key words:  Flood peak discharge  impervious surface  spatial distribution  urbanization  Qinhuai River Basin
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