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- W2896581973 abstract "Abstract The fresh component of submarine groundwater discharge (fresh SGD) transports nutrient and contaminant loads from land to sea. Fresh SGD fluxes are poorly known but depend on geology, topography, climate, and land use. Here we assess two general approaches for quantifying the magnitude of fresh SGD over regional to continental scales—water budgets (lumped parameter models) and groundwater flow models—focusing on the U.S. Atlantic and Gulf Coasts as a large‐scale case study. Estimates of fresh SGD fluxes from groundwater flow models are more variable than estimates from water budgets, and both are often less than field‐based estimates. Both approaches predict the volume of fresh SGD within approximately 50% of 12.3 km 3 /year, in line with previous estimates, and differences are largely driven by hydrographic data inputs. The simplified water budget approach, while computationally cheap, cannot resolve flow paths or continuous flux distributions and may neglect groundwater flow from deep aquifers or distal recharge zones. Conversely, three‐dimensional groundwater flow models can resolve flow paths and fresh SGD contributions from heterogeneous aquifer systems but are computationally expensive and require more parameterization. Ultimately, multiple models and integrated field data are needed to improve our estimates of fresh SGD fluxes over a wide range of scales." @default.
- W2896581973 created "2018-10-26" @default.
- W2896581973 creator A5046953023 @default.
- W2896581973 creator A5061776249 @default.
- W2896581973 creator A5068650689 @default.
- W2896581973 creator A5085696965 @default.
- W2896581973 date "2018-10-01" @default.
- W2896581973 modified "2023-10-17" @default.
- W2896581973 title "Opportunities and Challenges in Computing Fresh Groundwater Discharge to Continental Coastlines: A Multimodel Comparison for the United States Gulf and Atlantic Coasts" @default.
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