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针对当前城市化引起的水系结构单一化、河流连通性减弱以及水生态环境等问题,以南昌市城区为例,选取1990年、2000年、2010年3期遥感影像图像,分析城市化影响下土地利用的变化;基于1958年地形图与2010年江西省水系图,通过GIS提取两期南昌市城区水系图,选取数量特征和结构特征指标进行水系格局分析,并引入图论理论讨论两时期的水系连通性。结果表明:(1)20 a间城镇用地面积增加174.73 km~2,水域面积减少34.04 km~2。研究区水域面积随城镇用地增加而缩减;(2)城市化进程中,研究区河流水面率、河网密度和河频率均下降,支流发育薄弱,河网复杂度下降;(3)赣江以北水系连通度降低,赣江以南区域水系连通度提升。该研究将为城市化地区河流水系保护提供支持与参考。
Aiming at the problems of single structure, weakening of river connectivity and aquatic ecological environment caused by urbanization, this paper took Nanchang as an example. Three remote sensing images of 1990, 2000 and 2010 were selected to analyze the influence of urbanization on land Based on the topographical map of 1958 and the water system of Jiangxi Province in 2010, the water system of Nanchang city was extracted by GIS from two periods of GIS. The quantity characteristics and structural characteristics were selected to analyze the pattern of water system. The theory of graph theory was introduced to discuss the water system of the two periods Connectivity. The results showed that: (1) Urban land area increased by 174.73 km ~ 2 in 20 years and area decreased by 34.04 km ~ 2. (2) In the process of urbanization, the river surface water rate, river network density and river frequency decreased, the tributaries developed weakly and the river network complexity decreased; (3) In the process of urbanization, North River connectivity to reduce connectivity south of the Gan River to enhance regional connectivity. This study will provide support and reference for the protection of river water system in urban areas.