Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam)

  • Thao Bach NGUYEN Research and Advanced Technology Applications in Environmental, Material and Earth Sciences Research Team, Hanoi University of Mining and Geology, Vietnam
  • Nhan Dang DUC Institute for Nuclear Sciences and Technology, 179 Hoang Quoc Viet St., Ha Noi, Vietnam
  • Bang Duc DAO Hanoi University of Mining and Geology (HUMG), 18 Vien str,. Bac Tu Liem, Hanoi, Vietnam
DOI: https://doi.org/10.29227/IM-2023-02-42
Keywords: saltwater intrusion, groundwater modeling, sustainable groundwater development, coastal aquifers, surface water interaction, water resource management

Abstract

Saltwater intrusion in the rapidly developing city of Da Nang in central Vietnam is currently causing various water-related challenges,
including inadequate water supply and water pollution. An integrated SWAT-MODFLOW numerical model was used to investigate
the origin and mechanism of saltwater in Holocene and Pleistocene aquifers. Geophysical and isotopic approaches were used to validate
the SEAWAT model applied for simulating saltwater intrusion. The results suggest that the ebb and flow of tides, as well as water levels
in rivers primarily impact coastal aquifers. However, effective water resource planning and management, along with maintaining
the natural recharge of fresh water from local rain during the rainy season, could enable the rational and efficient utilization of
groundwater, reducing saltwater intrusion in many areas. During the dry season, groundwater is recharged from higher altitude areas.
The current saltwater intrusion mainly occurs along the rivers up to the hydraulic dam. Simulated models, using scenarios of stop
abstracting groundwater, but changing to the use of surface water for drinking water, show that the area of saline water shrinks quickly
after 30 years, reducing from 59.6 km2 to 39.5 km2 and from 40.2 km2 to 28.6 km2 in the Holocene and Pleistocene, respectively.

Published
2023-12-31
How to Cite
NGUYEN, T. B., DUC, N. D., & DAO, B. D. (2023). Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam). Test, 1(2 (52), 281–288. https://doi.org/10.29227/IM-2023-02-42
Issue
Vol 1 No 2 (52) (2023): Inzynieria Mineralna
Section
ARTICLES

Copyright (c) 2023 Thao Bach NGUYEN,Nhan Dang DUC,Bang Duc DAO

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