福州城市扩展对闽江下游水质影响的遥感分析

利用同步的影像和实测水质数据,建立悬浮物定量遥感模型,揭示2001~2006年闽江福州段悬浮物浓度的时空变化趋势,进而查明福州城市扩展对闽江水环境的影响。研究结果表明,闽江福州段悬浮物浓度在空间上呈现西低东高的分布特征,主城区沿线水质未受到城市扩展的影响,但快安-马尾河段悬浮物浓度增加显著,局部水质呈恶化趋势,这与周边大量新开发用地造成的水土流失有关。总的来看,所研究河段悬浮物浓度增加的水域面积仅占到总面积的9.4%,而浓度不变和下降的水域面积合计占到90.6%,说明整体水质日趋改善。

Remote Sensing Analysis of Impact of Fuzhou City Expansion on Water Quality of Lower Minjiang River,China

The models for estimating suspended sediment concentration (SSC) of the lower Minjiang River have been established and applied to reveal the SSC distribution and dynamics of the river from 2001 to 2006. It has been found that the expansion model of the city, which was planned to expand eastward and southward, has no significant impact on the SSC of the lower Minjiang River. The increase in SSC has only been found in the river portion between Kuaian and Mawei. In general, the area of increased SSC accounts for only 9.44% of the study water area during the period. On the other hand, the area of constant SSC and decreed SSC adds up to 90.6%. These indicate that the water quality of the studied river portion was generally improved. The river passing through the main urban area of Fuzhou was not notably affected by the urban expansion. The decline of the water quality between Kuaian and Mawei was due largely to intense soil erosion caused by the building up of several new industrial estates by the river shore areas.