Author(s)

L. T. V. Hoa, H. Shigeko, N. H. Nhan & T. T. Cong

Abstract

Besides causing severe damage, flooding in the Mekong river delta (MKRD) brings some benefit for this area by washing away acidic and salty water from the soil and therefore fertilizes it by the deposition of sediment. Thus, solving flood problems in this area is important. After the historical flood of 2000, dike, embankment, and road systems in the MKRD in Vietnam were upgraded. This change affected to some extent the propagation of the extremely big flood in 2001 that occurred immediately thereafter. This study aims to use HydroGis software with integration by a numerical hydrodynamic model and GIS tools to simulate and analyze the inundation influenced by this infrastructure change. Simulated results have showed obvious differences between the situations before and after systems upgrading. Keywords: flood, inundation, numerical model, Mekong river delta, hydrology. 1 Introduction The Lower MKRD occupies only 11% of the whole MKRD area, but it has to transport all water flow from the entire basin area; severe flooding occurs every year in this area. The delta is flat and inundation lasts several months, damaging crops and property that are insufficiently protected from flooding. Besides resulting in loss of life and property, however, flooding benefits agriculture in

Keywords

flood, inundation, numerical model, Mekong river delta, hydrology.