Nghiên cứu, đánh giá rủi ro lũ, ngập lụt theo các cấp độ mưa lớn và thượng nguồn cho thành phố Yên Bái và khu vực lân cận

Abstract

Flood risk assessment and flood damage analysis for high-risk areas in Yen Bai city and surrounding area (7 communes of Tran Yen district) have scientific and practical significance for planning flood response, management and investment efficiency in flood control works. In this study, a two-dimensional hydraulic model (MIKE FLOOD) and the flood damage analysis model HEC-FDA with the support of remote sensing technology and GIS  are used to calculate the damage according to the levels of risk (frequency flood - flood water level in rivers) and average annual damage in the area before and after the construction of the dike system. The calculation results show that damage in the current period can be from 107 to 12.787 thousand USD depending on the level of risk, in the future by 2050 it will increase by about 1,3 times. The efficiency of the investment in the dike system can bring in 550 thousand USD annually. This is an economic value for dicision maker to consider the efficiency in the investment of flood control works.