城市湖泊时空演变的遥感分析——以武汉市为例

在GIS技术支持下,以多时相Landsat TM/ETM 遥感影像为数据源,利用NDWI指数提取武汉市1991年、1995年、2000年、2002年的湖泊水域面积信息,引入湖泊萎缩强度等测度指标,从时空两方面对主城区湖泊水域变化和26个主要湖泊的发展演化特征进行了系统地分析.结果表明,从1991年到2002年,武汉市主城区湖泊水域面积急剧减少,达38.67km2;主要湖泊水域的面积变化具有时空分异特征,湖泊萎缩变化与湖泊所处地区的城市建设水平、道路交通规划、政策导向等因素密切相关.分析认为,城市湖泊转变为公园后,萎缩现象得到明显遏制,通过立法加强湖泊保护力度并尽早制定城市湖泊的规划管理措施,是保护武汉幸存湖泊的有力手段.

Spatial-temporal evolution of urban lakes in Wuhan City based on remote sensing images

This study presents a GIS/Remote sensing-aided procedure to monitor urban lake area change in Wuhan city, which grew rapidly in the 1990s. Four time-series Landsat images, the year of 1991, 1995, 2000 and 2002, were used here. Lake's border maps were made by NDWI(Normalized Difference Water Index) index and IILI(index of lake loss intensity) of 27 lakes were calculated for analysis. The results showed that the total areas of lakes in the urban area decreased up to 38.67km2 from 1991 to 2002. The temporal and spatial distribution of lake loss was affected by several factors such as city construction, transportation construction, policy guide etc. The urban lake can be well protected after changing into lake park. The present study suggested that legislation and lake planning were two approaches for urban lake protection.