巢湖水体悬浮物的遥感分析

Studies on Suspended Sediments in the Chaohu Lake by Remote Sensing

利用Landsat TM/ETM+卫星遥感影像为数据源,根据TM/ETM+的3、4波段反射率与悬浮物浓度存在着线性相关的性质,利用每个时相的3、4波段进行加法运算后的影像,对巢湖悬浮物浓度分布及其变化趋势进行了分析。研究结果表明,巢湖的悬浮物浓度较高,所占的面积在增大,悬浮物的污染还是很严重;但是,通过对1987年和2003年巢湖水体悬浮物悬浓度等级变化转移矩阵分析发现,悬浮物浓度等级降低的区域比悬浮物浓度等级升高的区域高出了17.64个百分点。这说明巢湖悬浮物的污染在减轻,国家对巢湖的治理已见成效。

Using multi-temporal Landsat TM/ETM＋ images, based on correlation between the spectral reflectivity of their 3,4 bands and concentration of suspended sediments, after adding operation, the authors have evaluated the concentration situation of suspended sediments in the Chaohu Lake. The result shows that, on the whole, the area of higher concentration of suspended sediments in the Lake has become larger and pollution situation has become worse. But through analysis of 1987-2003 change matrix of concentration of suspended sediments, we find that area which concentration of suspended sediments fell was higher 17. 64 percentage than the area which that increased, what indicated that pollution situation of suspended sediments has improved and Chaohu＇s pollution administration has achieved some progresses.