平原城市土地利用与河流污染关系分析——以天津市滨海地区为例

Relation Analysis of Land Use and River Water Quality in Plain City: A Case Study of Tianjin Coastal Region

以城市排水区替代平原城市河道的流域范围,选取天津滨海地区11条河流进行河流污染与土地利用的相关分析。根据遥感影像,利用GIS提取城市排水区土地利用数据,计算景观指数并与河流水质状况进行相关分析,为平原城市河流污染研究提供可行的方法支持和理论依据。结果表明,城市居民点与工矿用地是河流中重金属污染物(如铅、汞)的主要输入源;在耕地面积较大时增加了河流的有机污染物(如氨氮,生化需氧量等);林地、园地、草地和水体对于城市河流污染物有一定的净化作用。

The authors use drainage area to substitute the urban river basin and better illustrate the relationship between water quality and urban land use by taking full consideration of plain urban specificity. Based on 11 rivers＇ pollutants in Tianjin Costal region and RS image, GIS is used to analyze the qualitative correlation between land use data in drainage area and urban river water quality, hoping to provide method and theories support to analysis the rivers＇ pollutants in plain urban area. The results show that the urban construction land use will increase the water pollutant such as Pb and Hg; the arable land will increase the organic pollutants level; the grass land and water body will serve as the cleaner of the pollutants and help to improve the water quality.