Open AccessRisk Assessment of Debris Flow in Longchi Area of Dujiangyan based on GIS and AHP
Author(s) -
Huayun Xiao,
Xingsheng Tang,
Hongtao Zhang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/474/4/042010
Subject(s) - debris flow , digital elevation model , normalized difference vegetation index , hydrology (agriculture) , geographic information system , debris , geology , elevation (ballistics) , fault (geology) , field survey , analytic hierarchy process , remote sensing , geotechnical engineering , seismology , engineering , oceanography , structural engineering , climate change , operations research
In this study, a combination of analytic hierarchy process (AHP) and geographic information system (GIS) was used to analyze and obtain remote sensing images and digital elevation models (DEM) in the area through field surveys. The seven factors of rock layer type, vegetation cover index (NDVI), slope, height, fault influence zone, river influence zone and highway influence zone were selected. The purpose is to study the distribution range and law of debris flow at different levels in the area. The results show that the area is a highly prone area for debris flow for sand-mud interlayer and NDVI less than 0.10, the slope between 30 ° and 45 °, the height between 950-1300 meters, the fault impact zone within 400 meters, the river within 100 meters on both sides of the river, and the highway is 75 meters on both sides.