Modification and Recalibration of an Existing Groundwater Model of Shelby County, Tennessee

IF 2.2 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Journal of The American Water Resources Association Pub Date : 2025-10-02 DOI:10.1111/1752-1688.70050

Khairul Hasan, Brian Waldron, Rodrigo Villalpando-Vizcaino, Scott Schoefernacker

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Abstract

Recent updates and recalibration were made to a groundwater model of Shelby County, Tennessee, to simulate groundwater flow dynamics more accurately in and between aquifers and to be utilized for predictive simulations. The modified CAESER-II model extends the simulation period from 1960 to 2021 and incorporates several improvements: updated hydraulic parameters for the Memphis aquifer, refined aquitard breach characterization, and enhanced historical records for pumping and river stage. The recalibrated model achieved a mean absolute residual (MAR) of 3.31 m across the domain and 3.70 m at the Sheahan well field, demonstrating improved performance over the original CAESER-I model. Calibrated values for hydraulic conductivity and specific storage fell within literature-reported ranges, and the average vertical conductivity of breaches (0.076 m/day) closely matched values obtained from core samples and falling head tests. These enhancements enable better simulation of inter-aquifer leakage and provide utility managers with a robust tool for assessing well field vulnerability and evaluating the risk of contaminant migration through aquitard breaches.

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田纳西州谢尔比县现有地下水模型的修正与再校准

最近对田纳西州谢尔比县的地下水模型进行了更新和重新校准，以更准确地模拟含水层内和含水层之间的地下水流动动力学，并用于预测模拟。改进后的CAESER-II模型将模拟期从1960年延长至2021年，并进行了几项改进：更新了Memphis含水层的水力参数，改进了含水层破裂特征，增强了抽水和河流阶段的历史记录。重新校准的模型在整个区域的平均绝对残差（MAR）为3.31 m，在Sheahan井田的平均绝对残差（MAR）为3.70 m，与原始的CAESER-I模型相比，性能有所提高。水力导电性和比储水量的校准值在文献报道的范围内，裂缝的平均垂直导电性（0.076米/天）与岩心样品和下降水头测试的值非常匹配。这些改进可以更好地模拟含水层间泄漏，并为公用事业管理人员提供了一种强大的工具，用于评估井场的脆弱性和评估污染物通过含水层渗漏的风险。

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来源期刊

Journal of The American Water Resources Association 环境科学-地球科学综合

CiteScore

4.10

自引率

12.50%

发文量

100

审稿时长

3 months

期刊介绍： JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.