Study on the Rapid Evaluation of Geological Hazards in Mountain Towns Based on Slope Unit: Taking Jiangkou Town for Example

Abstract:

Taking Jiangkou Town as a case study and based on the high definition DEM of county town, all the slopes in the study area with potential danger and threatened object are delineated and numbered. Based on the “semi-qualitative and semi-quantitative slope risk assessment table” and using the engineering geological analogy method, the survey was conducted on each delineated slope to obtain the risk scores and vulnerability scores. The risk and vulnerability are divided into high, medium and low levels with the method of natural discontinuity, and then a risk assessment matrix is established by putting the assessed risk level and the vulnerability level as row vector and column vector respectively. Through the risk matrix, the risk level of each slope is obtained. At last, the risk grade of each slope is shown on the geographic information graph and VR panoramic photography to form a risk assessment of product.

Key words:mountainous town; geological hazard risk; rapid evaluation; slope unit; risk matrix; VR panoramic photography