基于RS的龙羊峡库区悬浮泥沙分布研究

Research of distribution of suspended sediments in Longyangxia reservoir based on RS

依据含沙水体的光谱特性,在可见光的任一波段内,水体中的含沙量与水面光谱反射率成正相关关系。研究表明TM2和TM3波段能够较好的反映水体悬浮泥沙的含量,并且TM2+TM3能使水体泥沙含量差异更显著。据此以龙羊峡库区为例,通过对该区两个时相的TM影像进行水体提取、二值化、掩膜、密度分割等处理,提出了一种悬浮泥沙分布的方法。经过对比分析表明该方法可以充分利用TM数据,在缺乏足够实测数据的情况下,可以有效、快捷地得到层次丰富的泥沙分布图。

According to the spectrum characteristic of water with silt,the quantity of suspended sediments in water has a certain relation with the reflection of water in every band of visible light.After studying,the second and third bands of TM image can reflect the quantity of sand in water very well,and the combination of them can sthengthen the difference in the quantities of sand in water.So,in this paper Longyangxia reservoir is taken for example.Making use of the TM image with two temporal in this area,by extracting water,creating a map with 0 1 encoding,masking and density slicing,we develop a method identification of the distrbution of suspended sediments in water.After analyzing and comparing,we draw a conclusion that this method can use multi-band of images adequately,especially in areas lack of measured data,and can make a rich image of suspended sediments distribution quickly and effectively.