Ứng dụng GIS và phương pháp chỉ số thống kê trong xây dựng bản đồ nhạy cảm trượt lở đất khu vực thành phố Bắc Kạn

Abstract

The northern mountainous region of Vietnam has steep terrain with many high mountains, landslides are quite common and are a dangerous type of natural disaster. In this study, GIS and statistical method has been applied to develop landslide sensitive map of Bac Kan city. The map is built on an integrated basis with weighted factors of conditions and causes of landslides such as: meteorology, geomorphology, weathering crust, engineering geology, slope, altitude, ... and human activities (using land). Evaluation of the accuracy of the statistical index model shows that the model has a relatively high accuracy when the slide points mostly occur on areas sensitive to landslides Very strong and Strong. The area that is alerted to landslide is Very strong, the guarantee level is 63.83%, followed by the areas that are sensitive to the slide of Strong, Medium, and Weak with the slip guarantee level of 29.79; 4.26 and 2.13%.