近30年来南四湖流域城市化进程中的水系变化分析

发布时间：2018-06-30 03:24

本文选题：城市化 + 水系结构　；参考：《湖泊科学》2017年01期

【摘要】：城市化对水系演化影响的研究国内目前多集中在快速、高速城市化地区,而对大流域、城市化发展较缓地区的研究比较薄弱.以南四湖流域为研究区,基于1987、2000和2014年3期遥感影像,分析了流域城市化进程中的下垫面变化特征;选取流域1980s、2003和2014年的地形图进行水系提取,从数量参数、结构参数和连通性参数3个角度分析近30年城市化进程中水系结构的时空变化特征.结果表明:(1)近30年来流域建设用地增加了1568.06 km~2,2000年以后城市建设用地扩张显著,2012年流域人口城市化率为32%;(2)1980s—2010s流域总河流长度、面积和河网密度均呈现出持续减少趋势,分别减少了135.46 km、2.75 km~2和0.49 km/km~2,各级河流表现出不同的变化特点,较低等级河流受到的影响较大;而流域水面率持续增加,近30年共增加了59.79%;(3)流域水系总体上还保持着自然状态下的空间格局,但结构特征发生了较大改变,河网结构稳定度减少了4.30%,连接率和实际结合度分别减少了21.82%和21.62%;子流域内部距湖区越远的空间城市扩展强度指数值越大,城市化对水系的影响越显著.该研究将补充对不同空间尺度、不同城市化水平地区河网水系演化影响的案例,并为研究区河网水系的保护提供支持与参考.
[Abstract]:The research on the influence of urbanization on the evolution of water system in China is mainly focused on the rapid and high-speed urbanization area at present, but on the large watershed, the research on the slow development of urbanization area is relatively weak. Taking the Nansihu Basin as the study area, based on the three remote sensing images of 1987 ~ 2000 and 2014, the characteristics of the underlying surface change in the course of urbanization of the basin are analyzed, and the topographic maps of the basin in 1980 s ~ (3) and 2014 are selected to extract the water system, and the quantitative parameters are obtained. Structural parameters and connectivity parameters are used to analyze the temporal and spatial characteristics of water system structure in the urbanization process in the past 30 years. The results are as follows: (1) the amount of construction land increased by 1568.06 km2 in the last 30 years, and the urban construction land expanded significantly after 2000, and the urbanization rate in 2012 was 32. (2) the total river length, area and density of river network in 1980s-2010s basin showed a continuous decreasing trend. The decrease of 135.46 km2 2.75 km~2 and 0.49 km / kg ~ 2, respectively, showed different characteristics of the rivers, and the lower grade rivers were affected greatly, while the water surface rate of the river basin continued to increase. In the past 30 years, there has been a total increase of 59.79. (3) the water system of the river basin still maintains the spatial pattern in its natural state, but the structural characteristics have changed greatly. The stability of river network structure is reduced by 4.30%, the connection rate and actual combination degree are reduced by 21.82% and 21.622%, respectively. This study will supplement the case of river network evolution in different spatial scale and different urbanization level, and provide support and reference for the protection of river network in the study area.
【作者单位】：中国矿业大学资源与地球科学学院;
【基金】：国家自然科学基金项目(41201166) 江苏高校优势学科建设工程项目国家级大学生创新训练计划项目(201510290045)联合资助
【分类号】：P343

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