BIẾN ĐỘNG NGUỒN NƯỚC MÙA LŨ HÀNG NĂM DO ẢNH HƯỞNG CỦA CÁC HỒ ĐẬP THƯỢNG LƯU VÀ DIẾN BIẾN LŨ NĂM 2018 Ở ĐỒNG BẰNG SÔNG CỬU LONG

Abstract

The Mekong Delta of Vietnam is affected by floods from the Mekong River Basin with the annual flood prone area varies from 1-2 million ha, the flood peak at Tan Chau- the upstream station in Vietnam - varies from 2.4-5.1m. Big floods (flood peak >4.5m at Tan Chau) often cause much damage for agricultural production, infrastructure, people and properties. Beside, floods may also bring a lot of benefits to the Delta such as alluvial sediment to fertile the soils, fisheries resources, water quality improvement and soil reclamation. The existing crops like Winter-Spring and Summer –Autumn rice crop evaded from the flooding period to avoid the damage due to flood and exploit the advantage of floods. The hydropower developments at the upstream of Mekong River were caused and will cause large change to the flood condition in the delta. This paper presented the change of annual flood due to the upstream hydropower development scenarios and an illustrated of the real flood in 2018 to ensure the confidence of the analyzed results.