Selvi Misnia Irawati, Fadhlan amin Amin, Andri Yadi Paembonan

Identifikasi dan Pemodelan 2D Zona Akuifer Daerah Buffalo River Dengan Menggunakan Data Audiomagnetotelluric

Introduction

Identifikasi dan pemodelan 2d zona akuifer daerah buffalo river dengan menggunakan data audiomagnetotelluric. Eksplorasi & pemodelan 2D zona akuifer dalam (0-500m) di Buffalo River menggunakan data Audiomagnetotelluric. Identifikasi lapisan akuifer potensial di formasi Bloyd dan Hale.

Abstract

Water is one of the important components in life on earth. The water source that is widely used now is groundwater. Groundwater is water that is below the surface and occupies cavities in the geological layer. This layer is called the aquifer layer. Groundwater exploration from shallow to very deep depth targets is an option for water availability.the study area is in the watershed of Buffalo, Arkansas. The buffalo river area has the potential for groundwater with a very deep depth. The depth of groundwater is very deep it is a problem to use geophysical exploration methods that are commonly carried out such as geoelectricity. Estimating aquifer layers is a problem that can be solved using audiomagnetotelluric (AMT) methods, especially aquifer layers at depths of more than 100 meters. Hence the need for this method to achieve targets and lithology at such depths. The use of the AMT method with a frequency range of 1 Hz – 10,000Hz which can reach depths of more than 1000 meters is one of the solutions to the problem of estimating very deep targets. AMT data rotated towards geoelectrical strike by N75oE. AMT modeling used using 2D inversion, the type of inversion is Non Linear Conjugate Gradient. Based on the results of modeling and interpretation, the formations arranged in the study area consist of the Bloyd formation, Hale formation, Boone formation, Everton formation and Ordovician formation. Layers that have potential as aquifer layers are obtained at low resistivities of 1-100 Ωm, are at depths of 0 - 500 meters with lithology arranged in the Bloyd formation and Hale formation. The formation is composed of several types of rocks, namely sandstone and limestone

Review

This paper presents a timely and relevant investigation into identifying deep aquifer zones in the Buffalo River region of Arkansas using audiomagnetotelluric (AMT) data. The study addresses a critical challenge in groundwater exploration: locating water resources at depths exceeding the reach of conventional geophysical methods like geoelectricity. The choice of AMT, with its broad frequency range (1 Hz – 10,000 Hz) enabling deep penetration (up to 1000 meters), is highly appropriate for the stated objective. The application of 2D inversion using the Non-Linear Conjugate Gradient method is a standard and robust approach for such data. The findings, identifying potential aquifer layers at 0-500 meters depth within the Bloyd and Hale formations (composed of sandstone and limestone) based on low resistivity values (1-100 Ωm), offer valuable insights into the area's hydrogeological potential. While the abstract clearly outlines the methodology and key results, there are several areas where further detail and clarity would enhance the full manuscript. The rationale behind the specific geoelectrical strike rotation (N75oE) could be more thoroughly explained, perhaps linking it to regional geological trends or a more detailed tensor analysis. The broad resistivity range of 1-100 Ωm identified for aquifers, while indicative, could benefit from a more nuanced interpretation considering the specific lithologies of the Bloyd and Hale formations. Additionally, the abstract would be strengthened by briefly mentioning data quality control measures or how the interpreted aquifer zones correlate with any existing geological knowledge or borehole data for validation. A more precise location of the study area within the Buffalo River watershed would also improve geographical context. Overall, this research addresses a significant problem in groundwater resource management, particularly in areas with deep-seated aquifers. The application of the AMT method provides a viable solution for exploring these challenging targets, making a valuable contribution to applied geophysics and hydrogeology. With a more comprehensive exposition of the methodological specifics, interpretational rationale, and validation in the full paper, this work has strong potential to advance our understanding of deep aquifer systems. The study's findings are pertinent for water resource planning and management in regions facing similar deep groundwater exploration challenges.

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