Abstract
SaiGon –DongNai (SG-DN) river system plays a vital role in developing the southern key economic triangle including Ho Chi Minh City, DongNai and BinhDuong provinces. Saltwater intrusion results from many factors and complex movements in SG–DN river system, in the midst of which are sea level rise and water regulation of upstream reservoirs. Theses causes have gradually changed the hydraulic regimes of the river system. As a result, saltwater intrusion has become seriously. In this article, the authors used mathematical models to investigate the change of saltwater boundary of the river system before and after the impact of sea level rise and the regulatory regime of the reservoirs. The findings contributed to the predicted scenarios where sea level rise and salinity boundary could be controlled through the regulation of upstream reservoirs.
Highlights
SaiGon –DongNai (SG-DN) river system includes DongNai river’s mainstream and four major tributary rivers that are La Nga river, Be River, SaiGon River and Vam Co River
As featuring a deep river bed, we have discovered that a gentle riverbed slope with high water level amplitude of daily tide leads to the rising tide of saltwater intrusion upstream, especially in the mid and late dry season (March and April)
As the results in Tab.[3], we find that when sea level rises, the salinity will spread deeply into the upstream of the river
Summary
SG-DN river system includes DongNai river’s mainstream and four major tributary rivers that are La Nga river, Be River, SaiGon River and Vam Co River. Saline intrusion is an extremely important and more noticeable issue in the low basin of SG-DN river. As featuring a deep river bed, we have discovered that a gentle riverbed slope with high water level amplitude of daily tide leads to the rising tide of saltwater intrusion upstream, especially in the mid and late dry season (March and April). In recent years, along with the impact of climate change and sea level rise, the calculations and predictions of saltwater intrusion have become more pressing. Many studies have lately reflected substantial improvement by using mathematical methods and algorithms. These methods have given the simulation results almost close to the actual measured ones. The prediction outcomes through mathematical calculations are reasonably accurate
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