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- W2808247934 abstract "Abstract Groundwater residence‐time distributions (RTDs) are critical for assessing susceptibility of water resources to degradation. A novel combination of numerical modeling and statistical methods allows estimation of regional RTDs with unprecedented speed. In this method, particle RTDs are generated in 30 type locales in the northeastern glaciated U.S. by using automated generalized finite‐difference groundwater flow and advective transport models. Targets for statistical learning were created from particle RTDs by fitting Weibull, gamma, and inverse Gaussian distributions. Whole‐basin flux‐weighted RTDs were well fit by one‐component Weibull distributions. Flux‐weighted RTDs at stressed receptors such as wells often produced more complicated RTDs that required a two‐component mixture to fit. A Multitask LASSO regression was trained on the parametric RTDs using hydrogeographic features of the modeled areas as explanatory features. In this way, RTDs are regionalized with mappable physical features such as recharge and aquifer volume. The shape, location, and scale parameters of the parametric RTDs are strongly related to the mean exponential age. The shape parameter of the distribution, which controls deviation from exponential, is additionally a function of aquifer heterogeneity and hydrologic features. Regionalized RTDs provide useful metrics with respect to groundwater lag times and solute loading to streams. The lag time between input and output contained in the RTD is critical to understanding the relation between the land surface and human and ecological receptors." @default.
- W2808247934 created "2018-06-21" @default.
- W2808247934 creator A5021285186 @default.
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- W2808247934 date "2018-09-01" @default.
- W2808247934 modified "2023-10-01" @default.
- W2808247934 title "Regionalization of Groundwater Residence Time Using Metamodeling" @default.
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- W2808247934 doi "https://doi.org/10.1029/2017wr021531" @default.
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