长江三角洲水系退化研究（英文）

编号 zgly0001584446

文献类型 期刊论文

文献题名 长江三角洲水系退化研究（英文）

作者 韩龙飞  许有鹏  雷超桂  杨柳  邓晓军  胡春生  徐光来 

作者单位 SchoolofGeographicandOceanographicSciences  NanjingUniversity  CollegeofTerritorialResourcesandTourism  AnhuiNormalUniversity 

母体文献 Journal of Geographical Sciences 

年卷期 2016年06期

年份 2016 

分类号 P343 

关键词 streamstructure  spatialandtemporalchange  urbanization  YangtzeRiverDelta 

文摘内容 Evolution of river systems under the background of human activities has been a heated topic among geographers and hydrologists. Spatial and temporal variations of river systems during the 1960s–2010s in the Yangtze River Delta(YRD) were investigated based on streams derived from the topographic maps in the 1960 s, 1980 s and 2010 s. A list of indices, drainage density(Dd), water surface ratio(WSR), ratio of area to length of main streams(R), evolution coefficient of tributaries(K) and box dimension(D), were classified into three types(quantitative, structural, and complex indices) and used to quantify the variations of stream structure. Results showed that:(1) quantitative indices(Dd, WSR) presented decreasing trend in the past 50 years, and Dd in Wuchengxiyu, Hangjiahu and Yindongnan have decreased most, about 20%. Structurally, the Qinhuai River basin was characterized by significant upward R, and K value in Hangjiahu went down dramatically by 46.8% during the 1960s–2010s. Decreasing tendency in D was found dominating across the YRD, and decreasing magnitude in Wuchengxiyu and Hangjiahu peaks for 7.8% and 6.5%, respectively in the YRD.(2) Urbanization affected the spatial pattern of river system, and areas with high level of urbanization exhibited least Dd(2.18 km/km2), WSR(6.52%), K(2.64) and D(1.42), compared to moderate and low levels of urbanization.(3) Urbanization also affected the evolution of stream system. In the past 50 years, areas with high level of urbanization showed compelling decreasing tendency in quantitative(27.2% and 19.3%) and complex indices(4.9%) and trend of enlarging of main rivers(4.5% and 7.9% in periods of the 1960s–1980s and the 1980s–2010s). In the recent 30 years, areas with low level of urbanization were detected with significant downward trend in Dd and K.(4) Expanding of urban land, construction of hydraulic engineering and irrigation and water conservancy activities were the main means which degraded the river system in the YRD.