Assessing Vulnerability of Regional-Scale Aquifer-Aquitard Systems in East Gulf Coastal Plain of Alabama by Developing Groundwater Flow and Transport Models
نویسندگان
چکیده
Groundwater vulnerability assessment helps subsurface water resources management by providing scientific information for decision-makers. Rigorous, quantitative of groundwater usually requires process-based approaches such as flow and transport modeling, which have seldom been used large aquifer-aquitard systems due to limited data high model uncertainty. To quantify the regional-scale in East Gulf Coastal Plain Alabama, a three-dimensional (3D) steady-state was developed using MODFLOW, after applying detailed hydrogeologic characterize seven main aquifers bounded aquitards. The velocity field calibrated observed heads then applied calculate age residence time this 3D system via backward/forward particle tracking. Radioactive isotope (14C 36Cl) were calibrate backward tracking model. Results showed that shallow (<300 ft below table) southern Alabama is mainly Anthropocene (25–75 years) hence susceptible surface contamination, while deep (700 or deeper contain “fossil” waters may be safe from modern contamination if there no artificial recharge/discharge. Variable horizontal vertical maps reflect hydrologic conditions intermediate-scale architectures models. These large-scale flow/transport models with coarse resolutions reasonably broad distribution fluctuation ages, probably structures being captured reliably geology Parameter sensitivity analysis, vadose zone percolation time, wavelet preliminary extension transient also discussed support aquifer indexed ages Alabama.
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ژورنال
عنوان ژورنال: Water
سال: 2023
ISSN: ['2073-4441']
DOI: https://doi.org/10.3390/w15101937