Investigation on the rainfall characteristic for triggering mountain hazards in Kangbumaqu river basin on 28th May,2021
On May 28,2021,a torrential rain and flash flood broke out in the Kangbu Maqu River Basin in Yadong County of Xizang Autonomous Region,located on the southern slope of the Himalayas.The war-ready highway along the river in the lower reaches of the river basin has collapsed in many places and the river bank has collapsed.Some sections of the road have been seriously damaged,and electricity communications and transportation have been interrupted,threatening the lives of the military and civilians at the downstream,and seriously affecting the livelihood of residents and the normal supply of armaments.Through the field investigation,the disaster situation was clarified,and the rainfall process was judged by combining the satellite remote sensing and ground rainfall monitoring data.The results show that the superposition of continuous rainfall and short-term heavy rainfall is the main inducing fac-tor for disasters such as flash flood,slope collapse(including rockfall)and riverbank collapses.Local mountain disas-ters such as collapses are closely related to the changes in rainfall monitored at stations.Satellite monitoring shows that the west side of Xiasima Town is the main rainstorm center,and the continuous rainfall in the local area from the 25th to the 28th and two short-duration rainstorms on the 26th and the 28th have triggered torrents and mountain haz-ards.It is worth noting that the time of this disaster is not the main flood season.The on-site investigation shows that some riverbanks and slopes still have the possibility of collapse,so the slopes and embankments should be strength-ened as soon as possible.In general,the rainfall monitored by stations is more inclined to explain local mountain di-sasters such as collapses,while satellite monitoring is easy to identify the main source areas of regional mountain tor-rents.The synergy of the two monitoring methods may be conducive to the all-round and multi-scaled monitoring and emergency response of mountain disasters in the basin.
South slope of HimalayasFlash floodMountain disastersCooperative monitoringHighway disaster
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