Abstract
PurposeGroundwater plays a critical part in both natural and human existence. When surface water is scarce in arid climates, groundwater becomes an immensely valuable resource. Dak Lak is an area that frequently lacks water resources for everyday living and production, and the scarcity of water resources is exacerbated during the dry season. As a result, it is critical to do study and understand about groundwater to meet the region's water demand. This study aims to extend the use of the MODFLOW model for groundwater simulation and assess the overall groundwater reserves and water demand in the highland province Dak Lak.Design/methodology/approachThe MODFLOW model is used in this work to compute and analyze the flow, prospective reserves of groundwater from which to plan extraction and estimate groundwater variation in the future.FindingsThe application of the MODFLOW model to Dak Lak province demonstrates that, despite limited data, particularly drilling hole data for subterranean water research, the model's calculation results have demonstrated its reliability and great potential for use in other similar places. The use of the model in conjunction with other data extraction modules is a useful input for creating underground flow module maps for various time periods. The large impact of recharge and evaporation on groundwater supplies and water balance in the research area is demonstrated by simulations of climate change scenarios RCP4.5 and RCP8.5.Originality/valueNone of the studies has been done previously to analyze water resources of Dak Lak and the scarcity of water resources is exacerbated during the dry season. Therefore, this study will provide useful insights in the water resource management and the conservation of Dak Lak. The groundwater in Dak Lak can meet the area's water demand, according to the results obtained and water balance in the study area. However, the management of water resources and rigorous monitoring of groundwater extraction activities in the area should receive more attention.
Highlights
With three river systems, the Serepok, Ba and Dong Nai, and high average annual rainfall, Dak Lak has plenty of surface water (Jeremy and Jeff, 2005; Japan International Cooperation Agency (JICA), 2018; World Bank, 2019)
While successful applications have been demonstrated in different countries, the model has been used for groundwater research in several places in Vietnam, mainly focusing on plain areas with negligible elevation differences
We aim to extend the use of the MODFLOW model for groundwater simulation in the highland province Dak Lak
Summary
The Serepok, Ba and Dong Nai, and high average annual rainfall, Dak Lak has plenty of surface water (Jeremy and Jeff, 2005; Japan International Cooperation Agency (JICA), 2018; World Bank, 2019). With industrial deposits of Grade C2 in the Buon Ma Thuot plateau, the groundwater source on basalt is relatively large (Japan International Cooperation Agency (JICA), 2018). Groundwater becomes the primary source of water for more than half of the province’s domestic and agricultural activities, including irrigating coffee plantations (Ellen et al, 2015; Dave et al, 2005). In the case of groundwater representation and calculation, MODFLOW is one of the most powerful models, as it has numerous applications in more than 90 countries (Nasrin et al, 2013; Waterloo Hydrogeologic, 2018a; USGS, 1997; Feng et al, 2010). While successful applications have been demonstrated in different countries, the model has been used for groundwater research in several places in Vietnam, mainly focusing on plain areas with negligible elevation differences
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