Geomorphic Features of the Bailongjiang River Drainage Basin and Its Relationship with Geological Disaster

Su Qi; Liang Mingjian; Yuan Daoyang; Xie Hong; Wu Zhao

doi:10.3799/dqkx.2016.527

Abstract：Active tectonics is one of the factor that impacts the geological disaster.In this paper,the control factors of the geological disas-ters (landslide and debris flow)in Bailongjiang drainage basin are studied.Based on SRTM-3 Digital Elevation Model,we make use of Arc-GIS spatial analysis techniques and Matlab scripts to extract various geomorphic parameters in Bailongjiang drainage basin systematically, such as the macro landform information,seven fitting S-A graphics of four graded rivers.Combined with neotectonic features,active faults,lithological distribution and rainfall condition,the control factors of geodisasters are analyzed.The results show that the convex fit-ting S-A graphics represents that the material output is bigger than the material input;on the contrary,the concave fitting S-A graphics represents that the material output is less than the material input;among which,the material input performs mountain uplift and the con-crete manifestation of material output is landslide,debris flow disaster produced in emergency.In addition,mylonitization or half myloniti-zation strata distribution controlled by regional tectonic movement is the essential factors for geological disasters.Affected by the compre-hensive factors above,it is concluded that geological disasters usually occurs in the region that elevation changes rapidly,high relief ampli-tude and high slope distribution and different sub-basin topography caused by regional differences in uplift control the area where geological disasters occur frequently,that is,geological disasters occur frequently in the sub-basin where material output is bigger than material input and the sub-basin where material input is bigger than material output doesn??t show the geological disasters distribution point.