1Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam

2Institute for Computational Science and Technology, Ho Chi Minh City, Vietnam

3Faculty of Environment, VNU-HCM University of Science, Ho Chi Minh City, Vietnam


The aim of this study was to assess the impacts of the changes in upstream flow and sea level rise due to climate change on seawater intrusion in the Sai Gon and Dong Nai Rivers in Ho Chi Minh City. The HEC-RAS model was used for simulating the salinity intrusion. The results of model calibration and validation indicated that the HEC-RAS model could simulate reasonably the streamflow and salinity concentration with NSE values exceeding 0.5 for both calibration and validation periods. Based on the results in the calibration in the HEC-RAS model, differences in salinity concentration under the separate and combined impacts of the changes in the upstream flow and sea level rise were analyzed. The results indicated that the salinity intrusion is likely to increase by 0.9 to 13% under the impact of sea level rise, by 1.6 to 4.3% under the impact of the changes in the upstream flow, and by 2.6 to 16.9% under the combined impacts of changes in the upstream flow and sea level rise. The research obtained in this study could be useful for local authorities in proposing solutions to reduce the impacts of seawater intrusion in Ho Chi Minh City.


Cite this paper

Nguyen Thi Diem Thuy, Nguyen Ky Phung, Nguyen Xuan Hoan, Dao Nguyen Khoi (2018), Assessing the Impacts of the Changes in the Upstream Flow and Sea Level Rise Due to Climate Change on Seawater Intrusion in Ho Chi Minh City Using the HEC - RAS 1D Model. Vietnam Journal of Hydrometeorology, 01, 64-69.


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