Types and development characteristics of high geological disasters in Chalonglongbaqu gully, Bomi , Tibet

Abstract

Chalonglongbaqu gully is located on the right bank of Parlung Zangbo. The steeply changing topography has bred a large number of high-level geological disasters, threatening the downstream linear engineering. Therefore, this paper uses multi-source and multi-phase high-resolution remote sensing data to establish remote sensing interpretation signs of high-level geological disasters, determines the types of high-level geological disasters in the study area, and elaborates their development characteristics. The results show that the main types of geological disasters in the study area include high-level ice avalanches, high-level avalanches, and high-level landslides. Among them, there are 3 high-level ice avalanches, all of which are located on a slope with an altitude of 5000 m above the south slope of the upper reaches of the valley, with an area of more than 15×104 m2. There are 19 high-level avalanches, which are mostly distributed in the middle reaches of the valley and high and steep bank slopes on both sides of the upper main ditch. The northern slope is more than the southern slope. There are two high-level landslides located in the upper reaches of the valley, and the landslide is dominated by moraines. Under the action of strong earthquakes or heavy rainfall, the above-mentioned high-level geological disasters are prone to instability and blockage of ditch. After blocking the ditch, it is easy to induce secondary disaster chains such as floods and mudslides, which will cause the risk of blocking the river downstream of Parlung Zangbo.

Keywords

• chalonglongbaqu gully
• high-resolution remote sensing
• high-level geological disasters
• disaster chain