基于ETM遥感影像的二滩库区水深反演研究

Study on Water Depth in Ertan Reservoir Area Based on ETM Remote Sensing Images

在常规测量研究的基础上,通过分析ETM遥感影像不同波段对水体、水深的敏感性,选取二滩水电站库区上段37断面以上河段,基于GIS平台建立了水深和相应的ETM适宜波段间的比值法水深遥感反演模型,从而快速获取大范围水域水深信息,整体精度达到80%以上。遥感反演水深作为评价浅水区泥沙淤积及其发展趋势的经济可行的方法之一,为库区泥沙淤积研究提供了新的思路。

Reservoir sedimentation is a puzzling problem for a long time.Silt deposits seriously in Ertan Reservoir area since its foundation in 1998.The water depth measurement has been carried out for 4 times,spending a lot of time and much money to evaluate the situation of sedimentation and its trend.Remote sensing method,ETM data are analyzed to study the sensitivity of different bands to water,is used in this research based on common in-situ measurements.Water depth remote sensing model is built on cross sections,from No 37 to No 42,of Yalong River and has got better accuracy.Results show that the acquisition of water depth from remote sensing method can supply a new way for obtaining water depth of large area in short time relatively.