西藏过布错湖泊演化的遥感分析

高原湖泊的演化研究是全球环境研究的重要组成部分,本文以西藏过布错湖泊为研究对象,利用RS、GIS技术,以TM图像为遥感信息源,根据遥感图像上过布错湖泊演化过程中所留下的相关沉积物的影像特征,反演古湖泊在四个不同时期的水域范围,并进一步分析了演化原因以及相应解决对策。研究表明,从更新世晚期至今,湖泊面积缩小了258.2km2。水位下降了76m,其中,在更新世晚期至全新世早期湖泊萎缩速度最快,其间分离出了一些小湖泊,此后湖泊退缩较慢。

Analyzing the evolution of GuoBuCuo lake in Tibet with remote sensing technology

The evolution research of lakes is an important topic for investigating the corresponding plateau environment.This paper concentrated on studying the lake-shrinking and relative aspects of the GuoBuCuo Lake.In the paper,with the usage of the RS,GIS technique,the remote sensing image of the GuoBuCuo lake was used as data resources to inverse extent of the lake during four different periods by the aid of sediments left in the image,and also the evolution reason and corresponding resolving strategy was analyzed.Investigation result shows that from the late mid Pleistocene epoch till now,the GuoBuCuo lake has dwindled about 258.2km2,and the water level declined about 76 m.The period during which the lake withered most seriously is between the late mid Pleistocene epoch and Holocene epoch.Since Holocene epoch,the decline of the water level has slowed down and some small lakes appeared.