Impacts of dike systems on hydrological regime in Vietnamese Mekong Delta

This paper examines the impact of the dike systems on river flows in the Vietnamese Mekong Delta (VMD). The study combined a hydrological change index method and the Mann–Kendall test to assess the temporal dynamics of both discharge and water levels along the main rivers of the VMD. Results highlig...

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Bibliographic Details
Published in:Water science & technology. Water supply 2022-11, Vol.22 (11), p.7945-7959
Main Authors: Xuan, Nguyen Van, Giang, Nguyen Ngoc Long, Ty, Tran Van, Kumar, Pankaj, Downes, Nigel K., Nam, Nguyen Dinh Giang, Ngan, Nguyen Vo Chau, Thinh, Lam Van, Duy, Dinh Van, Avtar, Ram, Thu Minh, Huynh Vuong
Format: Article
Language:English
Subjects:
Canals
Climate change
Deltas
Drainage canals
Dry season
Floods
flow regime
Human influences
Hydrologic regime
hydrological change index
Hydrology
irrigation construction
mann-kendall test
River flow
Rivers
Saline water
Trends
Upstream
vietnamese mekong delta (vmd)
Water discharge
Water levels
Waterways
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Summary:This paper examines the impact of the dike systems on river flows in the Vietnamese Mekong Delta (VMD). The study combined a hydrological change index method and the Mann–Kendall test to assess the temporal dynamics of both discharge and water levels along the main rivers of the VMD. Results highlight that the system of rivers and canals helps facilitate waterway traffic and drainage during the flood season. However, the low elevation of the delta has created conditions suitable for saline water to increasingly penetrate upstream during the dry season. Observed changes in the hydrological indicators at the upstream stations of Tan Chau (Mekong River) and Chau Doc (Bassac River) are not only due to the dike system but also upstream alterations to the flow regime. More research is needed to consider the various drivers of flow-regime change associated with natural and human activities both inside and outside of the study area.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2022.333