Version 1
: Received: 26 April 2023 / Approved: 3 May 2023 / Online: 3 May 2023 (12:39:01 CEST)
How to cite:
Nguyen, T.B.; Dang, N.D.; Dao, B.D. Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam). Preprints2023, 2023050148. https://doi.org/10.20944/preprints202305.0148.v1
Nguyen, T.B.; Dang, N.D.; Dao, B.D. Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam). Preprints 2023, 2023050148. https://doi.org/10.20944/preprints202305.0148.v1
Nguyen, T.B.; Dang, N.D.; Dao, B.D. Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam). Preprints2023, 2023050148. https://doi.org/10.20944/preprints202305.0148.v1
APA Style
Nguyen, T.B., Dang, N.D., & Dao, B.D. (2023). Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam). Preprints. https://doi.org/10.20944/preprints202305.0148.v1
Chicago/Turabian Style
Nguyen, T.B., Nhan Duc Dang and Bang Duc Dao. 2023 "Understanding Saltwater Origins and Mechanisms in the Coastal Aquifers of Da Nang Area (Central Vietnam)" Preprints. https://doi.org/10.20944/preprints202305.0148.v1
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 Holocene and Pleistocene, respectively.
Keywords
saltwater intrusion; groundwater modeling; sustainable groundwater development; Coastal aquifers; Surface water interaction; Water resource management
Subject
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
