Research on the Distribution of Frozen soil in Naqu Region Based on the AHP-Fuzzy Method

The Central Tibet Power Grid project, a high-level transmission line construction project in the Qinghai-Tibet Plateau, stretches over the Naqu region of Tibet with different types of frozen soil distribution. The design, construction and safe operation of the project are seriously affected by the distribution of frozen soil. Based on elevation data, this paper adopted the AHP-Fuzzy comprehensive numerical model as the theoretical research method to make a statistical analysis of the relevant factors affecting the frozen soil distribution. The research was completed with the help of GIS technology. The results show that the AHP-Fuzzy method is feasible for the study of regional frozen soil distribution; that the elevation and temperature are the main factors controlling the distribution of frozen soil in Naqu area; that the permafrost in Naqu area is mainly distributed in the northwest and southwest regions; that the frozen soil is distributed in the low-altitude areas of the central part; that the degradation of frozen soil has occurred in the eastern part of the country due to the rising temperature. The research results will pave way for the future route planning and design of the tower-based network project.