基于高分影像的湔江上游流域泥石流信息提取

The Debris Flow Information Extraction of Jianjiang River Upstream Watershed Based on the High Image

摘要: “5∙12”地震后的湔江上游流域泥石流灾害频发，给人民生命财产造成巨大损失。本文基于高分Pleiades影像，采用NDSI指数阈值法自动提取泥石流范围线，经目视解译和野外实地调查修正后，获取泥石流范围分布。经泥石流规模分类和数量统计分析表明：湔江上游流域大、中、小型泥石流分别为6、26、21处，不同河段泥石流分布特征差异明显，银厂沟河源段集中分布于小海子和湔江交汇处；银厂沟–龙门山镇段，泥石流发育密集，沿干支流呈线性分布；龙门山镇–新兴场段，左岸泥石流相比较少，呈集中分布，右岸泥石流呈零星分布；新兴场–丹景山镇，流域泥石流地质灾害较少，泥石流沿白鹿河呈线状分布。泥石流灾害信息提取可为泥石流灾害防治提供基础资料和数据支撑。

Abstract: After the earthquake, the frequent debris flow disaster of Jianjiang River upstream basin caused huge losses of life and property. In this study, based on the high Pleiades images, using NDSI index threshold value method automatically extracted the scope of debris flow line, through visual in-terpretation and field investigation correction to obtain the distribution of debris flow. After clas-sification of debris flow scale and statistical analysis of debris flow amount showed: the amount of debris flow that including large, medium and small scale is 6, 26, 21 respectively; the debris flow distribution characteristics of different river have significantly difference, Heyuan segment of Yinchang ditch concentrate in the intersection of the Small Lake and Jianjiang River; Yinchang ditch to Longmenshan town, the high density debris flow along the tributaries make a linear distribution; Longmenshan town to Xinxingchang segment, less mudslides are concentrated on the left bank, on the right bank mudslides are scattered; Xinxingchang to Danjingshan town, the mudslides disasters are less, along the White Deer River make a linear distribution. The information extraction of debris flow disasters can provide basic information and data support for the debris flow prevention.