基于遥感的三峡库区库岸岩土体类型及空间分布研究  

Study on Classification of Rock-Soil Bank Slope and Its Spatial Distribution in Three Gorges Reservoir Area Based on Remote Sensing

作　　者：郭培虹[1] 牛瑞卿[1] 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074

出　　处：《长江科学院院报》2010年第4期70-73,共4页Journal of Changjiang River Scientific Research Institute

基　　金："863"课题(2007AA12Z160);国家自然科学基金委项目(40672205);国土资源部三峡库区三期地质灾害防治重大科学研究项目(SXKY3-2-2)

摘　　要：三峡水库175 m蓄水后,库区水位在30 m范围内周期性波动,将引起地下水位变化和库岸再造,对土质岸坡和岩质岸坡产生不利影响。确定岸坡类型及其空间分布是评价岩土体稳定性的重要内容,采用传统方式在库区5 311 km的大范围内开展调查工作需要耗费大量的人力和财力。借助遥感技术,利用泥沙指数SI提取试验区相对泥沙浓度,并对泥沙浓度进行等级划分;通过不同等级的泥沙浓度划分,可大范围快速圈定土质岸坡和岩质岸坡的空间分布。经在三峡库区长江干流32个区段的野外实地验证,该方法划分岸坡类型的精度达84.375%。Since the Three Gorges Reservoir has been operated for water storage to elevation 175 m, the water levels in the reservoir area are fluctuating cyclically at the range of 30 m in the bank slope, which will lead to the changes in groundwater and reservoir banks rebuilding. And changes in groundwater and reservoir water may affect bank slope surface and rock mediums differently. It is of great significance for the disaster prevention and mitigation in the Three Gorges Reservoir area that the slope types and spatial distribution are determined. Surveying the reservoir banks in the Three Gorges Reservoir about 5311 km using traditional methods, we should require a lot of human and financial resources. In this paper, with remote sensing technology, we extracted the relative sediment concentra- tions at the experimental zone by sediment index（ SI）, and graded the sediment concentration, then the spatial dis- tributions of soil and rock bank slopes were differentiated. Comparing with the measured data, we can get a better result by the method that the bank slopes are classified by sediment concentration indirectly. The accuracy is 84. 375%. This paper offers a large-scale, fast, effective and new method for division of bank types.

关 键 词：三峡库区 泥沙浓度 岸坡类型 遥感 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] TV145[自动化与计算机技术—控制科学与工程]