运用SPOT数据进行河流水体悬浮固体浓度的研究——以台湾淡水河为例  

Estimating Suspended Sediment Concentrations from SPOT Image: A Case Study in Danshuihe,Taiwan

作　　者：许珺[1] 方红亮[1] 傅肃性[1] 黄绚[1] 

机构地区：[1]中国科学院地理研究所资源与环境信息系统国家重点实验室,北京100101

出　　处：《遥感技术与应用》1999年第4期17-22,共6页Remote Sensing Technology and Application

摘　　要：根据含沙水体的光谱特征，通过对比分析认为ＳＰＯＴ影像是河流水质遥感的理想数据源，其中１ 波段和２ 波段对反映水体悬浮固体比较敏感。根据遥感影像灰度值与水中悬浮固体含量之间的相关关系，运用ＳＰＯＴ影像的１、２ 波段和实测数据将淡水河悬浮固体含量分为４ 级，并对结果进行了评价。通过对悬浮固体污染等级图的分析，得出淡水河１０％ 以下的水体悬浮固体含量较高。悬浮固体含量从上游向下游递增，流经城市的河段悬浮物含量高，说明水体悬浮物含量受植被覆盖和人为作用影响。Remote sensing has been widely used in coastal water quality monitoring, several models have been established. High spatial and spectral resolution sensors, such as the Landsat TM, usually were used in estimating the suspended sediment concentrations in the coastal regions. But few people have used SPOT image in estimating suspended sediment concentrations. When studying the suspended sediment concentration in Danshui River in Taiwan, SPOT image was used because of its higher spatial resolution and Danshui River being not as wide enough as the coastal area. The grades map of suspended sediment concentration the entire river was acquired by use of maximum likelihood classification of SPOT band 1 and band 2. The result is tested by the measured data,and 15 samples of all 19 samples were correct, and the total accuracy is 78.8%. From the map of the river's suspended sediment grades, we can conclude that about 77% of the water quality is good. In mountain area, where the vegetation is good, the suspended sediment concentration is lower than that of city area, where the vegetation is not very good. And some drainage entrances can be found on the map.

关 键 词：悬浮固体 SPOT数据 河流 水体 卫星遥感 

分 类 号：P332.7[天文地球—水文科学] TP79[水利工程—水文学及水资源]