Stable isotope evidences on sources and mechanisms of groundwater recharge in Hohhot basin, China
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Keywords:
Depression-focused recharge
Infiltration (HVAC)
Groundwater discharge
Groundwater model
Depression-focused recharge
Phreatic
Groundwater model
Groundwater discharge
Cone of depression
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Recently numerical modeling of groundwater age has become a new direction in groundwater research because groundwater age in a particular aquifer records the history of different periods of groundwater advection,dispersion and hydrodynamic mixing.Under steady flow conditions,assuming the same groundwater recharge,runoff and drainage,the groundwater flow and age distributions are demonstrated in this study through a synthetic application with the different heterogeneities.The results indicate that interlayers with low permeability have a positive effect for the deep regional groundwater circulation and update.Meanwhile,the results show that the groundwater dispersion plays an innegligible role in modeling groundwater age in regional-scale deep aquifers.Groundwater age modeling provides a new way for the study of groundwater circulation and sustainable use of groundwater resources on a regional scale.
Groundwater model
Depression-focused recharge
Groundwater discharge
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Abstract Simulating groundwater flow in basin‐fill aquifers of the semiarid southwestern United States commonly requires decisions about how to distribute aquifer recharge. Precipitation can recharge basin‐fill aquifers by direct infiltration and transport through faults and fractures in the high‐elevation areas, by flowing overland through high‐elevation areas to infiltrate at basin‐fill margins along mountain fronts, by flowing overland to infiltrate along ephemeral channels that often traverse basins in the area, or by some combination of these processes. The importance of accurately simulating recharge distributions is a current topic of discussion among hydrologists and water managers in the region, but no comparative study has been performed to analyze the effects of different recharge distributions on groundwater simulations. This study investigates the importance of the distribution of aquifer recharge in simulating regional groundwater flow in basin‐fill aquifers by calibrating a groundwater‐flow model to four different recharge distributions, all with the same total amount of recharge. Similarities are seen in results from steady‐state models for optimized hydraulic conductivity values, fit of simulated to observed hydraulic heads, and composite scaled sensitivities of conductivity parameter zones. Transient simulations with hypothetical storage properties and pumping rates produce similar capture rates and storage change results, but differences are noted in the rate of drawdown at some well locations owing to the differences in optimized hydraulic conductivity. Depending on whether the purpose of the groundwater model is to simulate changes in groundwater levels or changes in storage and capture, the distribution of aquifer recharge may or may not be of primary importance.
Depression-focused recharge
Groundwater model
Infiltration (HVAC)
Groundwater discharge
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