基于河谷横剖面形态特征的滑坡体堵江易发性评价研究

发布时间：2018-02-01 03:42

本文关键词： 滑坡堵江河谷横剖面自动提取逻辑回归　出处：《地理与地理信息科学》2016年05期 　论文类型：期刊论文

【摘要】：滑坡体堵江易发性评价是滑坡堵江风险研究中的短板,不利于其防灾减灾工作的开展。该文以物质来源、水力条件和河谷地形为主要影响因素进行滑坡体堵江概率预测分析和应用,提供了基于GIS技术的河谷横剖面形态参数自动提取方法,以定量表征河谷地形特征;以中国喜马拉雅山地区为例,分别提取堵江滑坡和非堵江滑坡事件为样本,基于逻辑回归建立了研究区滑坡体堵江概率预测模型,经验证精度较理想。取得的主要结论有:1)河谷横剖面形态参数自动提取方法,具有面向对象、表征全面、提高计算效率和精度等优点。2)在中国喜马拉雅山地区,堵江滑坡事件与非堵江滑坡事件发生处河谷横剖面的坡高、不同深度宽深比、凹度和河宽指数具有显著差异,其中河宽指数差异最大,3/4坡高宽深比次之。3)基于逻辑回归开展滑坡体堵江易发性评价是可行的,该方法在中国喜马拉雅山地区的应用精度达80%以上,各变量按照与滑坡体堵江形成的相关性从大到小依次是坡高宽深比、滑坡面积、工程地质岩组、河宽指数和凹度。
[Abstract]:River blocking landslide susceptibility assessment is the landslide risk research in the short board River, not conducive to the development of disaster prevention and mitigation work. In this paper, the source, the hydraulic condition and valley terrain as the main factors analysis and application of probability prediction of river blocking landslide, provides a method for automatic extraction of shape parameters of cross section of River Valley based on GIS technology, the quantitative characterization of valley terrain features; Chinese taking Himalaya Range area as an example, were extracted from the river blocking landslide and river blocking landslide events as samples, logistic regression is established in the area of river blocking landslide probability prediction model based on the verification accuracy is perfect. The main conclusions are as follows: 1) automatic method extraction of Valley cross-section shape parameters, with object oriented, comprehensive characterization, improve the computational efficiency and precision of.2) in the Himalaya Range area China, river blocking landslide river blocking landslide events and non events Located in the valley of the cross section of high slope in different depth, aspect ratio, and the width of the river concavity index has significant difference, the biggest difference index of river width, 3/4 slope with high aspect ratio of.3) to carry out logistic regression of landslide susceptibility assessment based on blocking river is feasible. The application accuracy of this method in the Himalaya Range area China the above 80% variables, in accordance with the correlation between the formation of landslide blocking river from big to small slope with high aspect ratio, landslide area, engineering geological rock group, river width index and concavity.

【作者单位】：中国国土资源航空物探遥感中心;
【分类号】：P642.22
【正文快照】： 0引言滑坡堵江是滑坡堆积体向下运动、推移,堵塞山间河流的现象,一定规模的滑坡堵江事件常常在坝体形成、回水淹没或坝体失稳、洪水溃决的过程中造成巨大破坏[1,2]。针对滑坡堵江的链式过程,已有学者围绕滑坡发生危险性[3]、滑坡坝体稳定性[4-6]、溃决洪水演进模拟[7]和承灾体

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