Geographia Technica, Vol 16, Issue 2, 2021, pp. 105-115
FLASH FLOOD HAZARD MAPPING USING SATELLITE IMAGES AND GIS INTEGRATION METHOD: A CASE STUDY OF LAI CHAU PROVINCE, VIETNAM
Quoc Lap KIEU 
ABSTRACT: Lai Chau is a typical mountainous province of Vietnam, with a natural area of 9068.78 km2, this is a province that frequently occurs flash floods. This paper presents the results of the application of Satellite images, combining the GIS - AHP - MCA integration method to create a zoning map and warn of flash floods in Lai Chau province. The results of this study indicate the analyses and appraisals over 6 primary factors that incite flash flood, including the characteristics of geomorphology, the properties of soils, the types of forests and fractional vegetation cover, the slope of local drainage basins, average annual rainfall and the river/stream density of the region. The zoning map showing flash flood potentials has determined that 33.55% (3042.5 km2) of the area had an extremely high risk of flash flood occurrences, 44.42% of the area had a medium risk and 22.03% had a risk of flash flood at the low or very low level. Zoning map and flash flood warnings have great significance in preventing flash floods and minimizing damage in the study area.
Keywords: Spatial analysis, Satellite images, GIS, flash flood, Vietnam
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