1 Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam
2 Institute for Computational Science and Technology, Ho Chi Minh City, Vietnam
3 Faculty of Environment, VNU-HCM University of Science, Ho Chi Minh City, Vietnam
*Corresponding author: email@example.com
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.
1. Brunner, G.W., 2010. HEC-RAS River Analysis System Hydraulic Reference Manual (version 4.1). US Army Corp of Engineers. Hydrologic Engineering Center (HEC), Davis California, USA.
2. GSO - General Statistics Office, 2018. Statistical Yearbook of Vietnam in 2017.
3. Ha, N.T.T., Trang, H.T., Vuong, N.V., and Khoi, D.N., 2016. Simulating impacts of sea level rise on salinity intrusion in the Mekong Delta, Vietnam in the period 2015-2100 using MIKE 11. Naresuan University Engineering Journal. 11: 21-24.
4. IPCC, 2013. The Physical Science Basis: Contributing of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK.
5. Katzfey, J., McGregor, J., Ramasamy, S., 2014. High-resolution climate projections for Vietnam, Technical Report.
6. Khoi, D.N., Thom, V.T., Linh, D.Q., Quang, C.N.X., Phi, H.L., 2015. Impact of climate change on water quality in the Upper Dong Nai River Basin, Vietnam. Proceedings of the 36th IAHR World Congress. Netherland.
7. Moriasi, D.N., Arnold, J.G., Van, Liew M.W., Bingner, R.L., Harmel, R.D., Veith, T.L., 2007. Model evaluation guidelines for systematic quantification of accuracy in watershed simulations, Transaction of ASABE, 50: 885-900.
8. Tri, D.Q., Tuyet, Q.T.T., 2016. Effect of climate change on salinity intrusion: case study Ca River Basin. Vietnam. Journal of Climate Change, 2(1): 91-101.
9. Van, L.C.J., Dan N.P., Dieperink, C., 2016. The Challenges of Water Governance in Ho Chi Minh City. Integrated Environmental Assessment and Management. 12(2): 345-352.