PRELIMINARY STUDY OF GEOHAZARD DEVELOPMENT PATTERNS IN THE SOUTHEAST REGION OF HIMALAYA MOUNTAINS

Combined with RS and MAPGIS, the geohazards of the southeast of Himalaya Mountains in Tibet are studied. The geohazards include landslide, rock fall, mudflow, ice lake, and checked-up lake. The landslide, rock fall and mudflow account for about 95.3% of the total geohazards. The patterns of the development of geohazards are discussed accordingly. The results indicate that the geohazards are not evenly distributed in the region. A majority of the landslides are developed in Longzi county and Lang County. A majority of the mudflows are developed in Milin county, Longzi county and Luozha county. A majority of the rock falls took place in Longzi county. Meanwhile, the study shows that the landslides have a close relationship with the strata, the slope and the land type. The Xiukang group, Ridang formation and Nianqingtanggula group are prone to slide strata. The slope angle between 16～30 is the slope angle prone to slide. and The shrubbery and grassland are the two land types prone to slide. The Niuru formation is the stratum prone to take place mudflow. The range of 16～30 is the slope angle prone to mudflow too. The icefall and permanent snow area are the place easy to take place mudflow. However, the rock fall mainly takes place in the Nieru formation and on the slopes with slope angle larger than 60o. These findings can be used as a basis for a spatial prediction of the geohazards in the region.