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地理学报  2011 

京津唐城市群不透水地表增长格局以及水环境效应

DOI: 10.11821/xb201111005, PP. 1486-1496

Keywords: 不透水地表,水环境,城市,遥感,京津唐城市群

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Abstract:

不透水地表(ImperviousSurfaceArea,ISA)时空格局是城市化与全球环境变化交互影响下的土地利用/覆盖变化—生态系统过程—区域气候变化相互作用机理以及导致的环境效应研究的重要内容。如何快速准确地实现区域尺度不透水地表遥感信息的获取是上述研究面临的重要瓶颈问题。本研究嵌入中国LUCC信息改进了基于MODISNDVI与夜间灯光指数(DMSP-OLS)提取不透水地表信息的方法,反演了2000年与2008年京津唐城市群2期250m不透水地表信息,进而分析其变化的时空格局,结合子流域单元与河流污染物监测数据评价其对海河流域地表水环境的影响。结论表明受环渤海经济区,天津滨海新区开发等政策的影响,京津唐城市群在21世纪初8年不透水地表沿着城—乡梯度带、城市交通廊道及海岸带高速增长。城乡建设用地不透水地表增长呈现显著的时空差异特征,由于北京市受人口-资源-环境的压力,产业发展不断向周边地区转移,天津与河北唐山、廊坊、秦皇岛三市具有更快的不透水地表增长速度。京津唐城市群城市高密度的不透水地表分布对于海河流域地表水环境产生严重影响,不透水地表的增长加剧了流域河流水质的污染程度。同时也发现,子流域不透水地表面积比例与COD、NH3-N浓度均值呈现显著的线性关系。

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