TITLE:
Regionalization and the Method for Risk Grading for Flash Flood Disaster in Tibet Region
AUTHORS:
Yangzong Ciren, Nima Ji
KEYWORDS:
Tibet, Flash Flood, Risk Regionalization, Vulnerability Assessment, Flash Flood Prevention
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.5,
May
26,
2022
ABSTRACT: Flash flood is one of the major meteorological disasters on the Tibet
Plateau (TP). Flash flood
risk regionalization based on the theory of flash flood occurrence risk is the
essential basis for relative risk management. The flash flood risk
regionalization and the high-resolution grid mountain flood risk level in TP is
carried out by using ArcGIS with the indicators of rainfall, days of heavy
rain, vegetation cover, slope, relative elevation difference, river network
density, population density, average GDP and traffic density. The areas with
high mountain flood risk are mainly located in the middle and downstream of
Yarlung, the Nujiang River Valley, the Jinsha River and Lancang River Basin.
Besides, the results of flash flood disaster risk regionalization were tested
by using historical flash flood disaster data and calamity census data. The
disasters occurred in high-risk and sub-high-risk regions are accounted for 73%.
Flash floods that cause casualties and economic losses of more than 100,000 CNY (Chinese Yuan) occurred in
high-risk areas. Flash flood risk assessment may provide reference for
the prevention and control of geological disasters in TP, improve disaster
prevention and mitigation capabilities, reduce the hazards of flash floods to
social development.