Estimation of Deposited Sediment Budgets on the Floodplain of an Giang Province, Vietnam

Abstract

This paper presents the result of suspended and deposited sediment measurements on the floodplain of An Giang province along the Cambodia-Vietnam border during a flood event in 2018. GIS and Remote sensing techniques were used to build maps for the flooded areas. Discharge were also measured on main channels and on the floodplain. Correlation equations between deposition sediment and discharge were build. The results of Landsat interpretting showed that inundation area of the floodplain was 35,765ha. Deposited sediment decreased with distance from the main channels. The results showed that total deposited sediment mass brought to the floodplain during a single flood event in 2018 was 5.023 million tons (14.04 kg/m2) and decreased compared to previous years. The decreased sediment, and its associated nutrients will negatively affect agricultural production in the floodplain, which will lead to a major impact on the ecological environment, and economic development of the region.