Time-lapse electrical resistivity tomography for assessment of seasonal moisture variations in a tropical regolith

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2022-01-01 DOI:10.3178/hrl.16.18

A. Mojica, Bolívar Duarte, F. Vergara, Milagros Pinto-Núñez, Reinhardt Pinzón, J. Pérez, María Gabriela Castrellón, Carlos A. Ho, M. Gómez

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引用次数: 2

Abstract

: Monitoring and quantifying hydrological flows in the vadose zone is complicated to analyze due to the effects of rainfall in the tropics, the dynamic interactions among rains, the vegetation layer, moisture in the soil, and the entire regolith. Quantifying subsurface hydrological flows at specific scales and high resolution presents further diffi‐ culties. To overcome these issues, resistivity methods can play an important role. This paper examines the results of gravimetric moisture content monitoring in the Panamanian tropics through time-lapse electrical resistivity tomography analysis. Changes in the electrical properties of soil were quantified through six tomographic tests performed between February 2012 and March 2013 along with a profile. Significant changes in resistivity were identified between February (dry season) and May, and August and October (rainy season), with negative percentages (–60%) indicating the effects of rain infiltration at the surface and positive percentages (60%) linked to moisture absorption in the soil, electrode relocation for each test or inversion pro‐ cesses. Additional laboratory analyses of soil samples were carried out to obtain gravimetric moisture content tomo‐ grams. The changes of this parameter in the subsurface horizons, and the percentage differences in the calculated resistivity values, are helpful for determining the impact of rain on the soils.

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用于评估热带风化层季节性湿度变化的延时电阻率层析成像

由于热带地区降雨、降雨、植被层、土壤水分和整个风化层之间的动态相互作用的影响，对水汽带水文流量的监测和量化分析是复杂的。在特定尺度和高分辨率下对地下水文流量进行量化提出了进一步的困难。为了克服这些问题，电阻率方法可以发挥重要作用。本文通过延时电阻率层析成像分析研究了巴拿马热带地区的重力含水率监测结果。通过2012年2月至2013年3月期间进行的六次层析成像测试以及剖面，对土壤电特性的变化进行了量化。在2月(旱季)和5月，以及8月和10月(雨季)之间确定了电阻率的显著变化，负百分比(-60%)表明地表雨水入渗的影响，正百分比(60%)与土壤中的水分吸收、每个测试或反演过程的电极重新定位有关。对土壤样品进行了额外的实验室分析，以获得重量水分含量。该参数在地下层位的变化，以及电阻率计算值的百分比差异，有助于确定降雨对土壤的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.