The Distribution Regularity of Geohazard in the Dry-Hot Valley of Jinsha River: Case Study in Derong County

Abstract

Derong County is located in Ganzi Tibetan Autonomous Prefecture in southern part of Sichuan Province, in the upper of the Jinsha River, where there is a subtropical plateau monsoon climate, abundant sunshine, and large amount of evaporation, so it is a typical dry-hot valleys region. Derong County is the area of more ups and downs in the terrain, deep valleys, steep mountains, complex geological conditions, intense tectonic activity, various climate types, and has obvious vertical zone effect by temperature, serious physical weathering of rock, and landslide, debris flow, collapse and other geohazards are easily induced under the influence of rainfall and human engineering activities. These geohazards have brought serious harm to the people's lives and property, and have a great impact on the socio-economic development. Through the analysis of geohazards in the study area to investigate its distribution and development trends, this paper provide a basis for geohazard prevention and economic development.

Spatio-Temporal Changes of Land-Use/Land Cover Change and the Effects on Ecosystem Service Values in Derong County, China, from 1992–2018

“…Derong County (99 • 07 E to 99 • 34 E, 28 • 09 N to 29 • 10 N) located in the southeastern edge of the Qinghai-Tibet Plateau and southwestern part of Sichuan Province, China (Figure 1). It is a principal ecological functional area in China and belongs to the Hengduan Mountains region, the most representative dry-hot valley region in China [39][40][41][42][43][44]. It belongs to the subtropical arid valley climate zone, with sufficient sunshine [39,40].…”

“…It is a principal ecological functional area in China and belongs to the Hengduan Mountains region, the most representative dry-hot valley region in China [39][40][41][42][43][44]. It belongs to the subtropical arid valley climate zone, with sufficient sunshine [39,40]. The average annual rainfall is 327.1 mm, and the annual average temperature is 14.8 • C. The annual average frost-free period is 243 d, the annual average sunshine time is 2200.7 h, and the annual average relative humidity is 46%.…”