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Article

Comparing Q-Tree with Nested Grids for Simulating Managed River Recharge of Groundwater

by 1,2,3 and 1,2,*
1
The Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, Hebei, China
2
Key Laboratory of Groundwater Contamination and Remediation of Hebei Province and China Geological Survey, Shijiazhuang 050061, Hebei, China
3
College of Water Resources and Environment, Hebei GEO University, Shijiazhuang 050031, Hebei, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3516; https://doi.org/10.3390/w12123516
Received: 21 October 2020 / Revised: 6 December 2020 / Accepted: 12 December 2020 / Published: 14 December 2020
The use of rivers to recharge groundwater is a key water resource management method. High-precision simulations of the groundwater level near rivers can be used to accurately assess the recharge effect. In this study, we used two unstructured grid refinement methods, namely, the quadtree (Q-tree) and nested grid refinement techniques, to simulate groundwater movement under river recharge. We comparatively analyzed the two refinement methods by considering the simulated groundwater level changes before and after the recharge at different distances from the river and by analyzing the groundwater flow and model computation efficiency. Compared to the unrefined model, the two unstructured grid refinement models significantly improve the simulation precision and more accurately describe groundwater level changes from river recharge. The unstructured grid refinement models have higher calculation efficiencies than the base model (the global refinement model) without compromising the simulation precision too much. The Q-tree model has a higher simulation precision and a lower computation time than the nested grid model. In summary, the Q-tree grid refinement method increases the computation efficiency while guaranteeing simulation precision at a certain extent. We therefore recommended the use of this grid refinement method in simulating river recharge to the aquifers. View Full-Text
Keywords: managed recharge; groundwater model; unstructured grid; refinement; MODFLOW managed recharge; groundwater model; unstructured grid; refinement; MODFLOW
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MDPI and ACS Style

Cui, W.; Hao, Q. Comparing Q-Tree with Nested Grids for Simulating Managed River Recharge of Groundwater. Water 2020, 12, 3516. https://doi.org/10.3390/w12123516

AMA Style

Cui W, Hao Q. Comparing Q-Tree with Nested Grids for Simulating Managed River Recharge of Groundwater. Water. 2020; 12(12):3516. https://doi.org/10.3390/w12123516

Chicago/Turabian Style

Cui, Weizhe; Hao, Qichen. 2020. "Comparing Q-Tree with Nested Grids for Simulating Managed River Recharge of Groundwater" Water 12, no. 12: 3516. https://doi.org/10.3390/w12123516

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