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Airborne Geophysical Analysis to Decipher Salinization for Coastal Louisiana
Water Research ( IF 11.4 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.watres.2025.123215
Michael Attia, Frank T.-C. Tsai, Shuo Yang, Burke Minsley, Wade H. Kress
Water Research ( IF 11.4 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.watres.2025.123215
Michael Attia, Frank T.-C. Tsai, Shuo Yang, Burke Minsley, Wade H. Kress
Coastal Louisiana is known for saltwater intrusion that threatens wetlands, aquifers, and rivers. However, the extent of saltwater intrusion is not well understood. This study develops an innovative framework with airborne electromagnetic (AEM) data to map chloride concentration distributions for wetlands in the Mississippi River deltaic plain and Chenier plain as well as for the Mississippi River Valley alluvial aquifer (MRVA) and Chicot aquifer. Moreover, the framework maps chloride concentrations along the Mississippi River and Atchafalaya River. Key components in the framework include the establishment of resistivity-to-chloride concentration transformation, 3D resistivity architecture building through geostatistics, and the employment of a lithologic model. The transformation functions correlate AEM resistivity data with porewater salinity measurements and groundwater and river chloride samples. The results show that AEM data reliably infers soil water chloride concentrations and correlates well with the distribution of various marsh types. AEM data reveals extensive saltwater presence at depth and near the coast, originating from salt domes and the Gulf of Mexico, respectively. The saltwater upconing pattern in the Chicot aquifer is likely due to excessive groundwater withdrawals. The AEM data also confirms a distinct tongue of saltwater intruding into the Atchafalaya Basin from the Gulf. The AEM data helps to identify faults that are obscured or eroded at the surface, which appear as leaky barriers in the subsurface where dramatic changes in chloride concentration are apparent. Finally, this study uses the AEM data to infer the presence of an extensive seawater wedge in the Mississippi River and Atchafalaya River.
中文翻译:
航空地球物理分析破译路易斯安那州沿海的盐渍化
路易斯安那州沿海地区以威胁湿地、含水层和河流的咸水入侵而闻名。然而,盐水侵入的程度尚不清楚。本研究利用机载电磁 (AEM) 数据开发了一个创新框架,以绘制密西西比河三角洲平原和切尼尔平原湿地以及密西西比河河谷冲积含水层 (MRVA) 和奇科特含水层的氯化物浓度分布。此外,该框架还绘制了密西西比河和阿查法拉亚河沿岸的氯化物浓度图。该框架中的关键组成部分包括建立电阻率到氯化物浓度的转换、通过地质统计学构建 3D 电阻率架构以及采用岩性模型。转换函数将 AEM 电阻率数据与孔隙水盐度测量值以及地下水和河流氯化物样品相关联。结果表明,AEM 数据可靠地推断了土壤水氯化物浓度,并与各种沼泽类型的分布密切相关。AEM 数据显示,深处和海岸附近存在广泛的咸水,分别来自盐丘和墨西哥湾。Chicot 含水层中的咸水上升模式可能是由于地下水过度抽取造成的。AEM 数据还证实了从墨西哥湾侵入 Atchafalaya 盆地的独特咸水舌。AEM 数据有助于识别在表面被遮挡或侵蚀的断层,这些断层在氯化物浓度发生明显变化的地下表现为泄漏屏障。最后,本研究使用 AEM 数据推断密西西比河和阿查法拉亚河中存在广泛的海水楔形。
更新日期:2025-01-28
中文翻译:
航空地球物理分析破译路易斯安那州沿海的盐渍化
路易斯安那州沿海地区以威胁湿地、含水层和河流的咸水入侵而闻名。然而,盐水侵入的程度尚不清楚。本研究利用机载电磁 (AEM) 数据开发了一个创新框架,以绘制密西西比河三角洲平原和切尼尔平原湿地以及密西西比河河谷冲积含水层 (MRVA) 和奇科特含水层的氯化物浓度分布。此外,该框架还绘制了密西西比河和阿查法拉亚河沿岸的氯化物浓度图。该框架中的关键组成部分包括建立电阻率到氯化物浓度的转换、通过地质统计学构建 3D 电阻率架构以及采用岩性模型。转换函数将 AEM 电阻率数据与孔隙水盐度测量值以及地下水和河流氯化物样品相关联。结果表明,AEM 数据可靠地推断了土壤水氯化物浓度,并与各种沼泽类型的分布密切相关。AEM 数据显示,深处和海岸附近存在广泛的咸水,分别来自盐丘和墨西哥湾。Chicot 含水层中的咸水上升模式可能是由于地下水过度抽取造成的。AEM 数据还证实了从墨西哥湾侵入 Atchafalaya 盆地的独特咸水舌。AEM 数据有助于识别在表面被遮挡或侵蚀的断层,这些断层在氯化物浓度发生明显变化的地下表现为泄漏屏障。最后,本研究使用 AEM 数据推断密西西比河和阿查法拉亚河中存在广泛的海水楔形。