Combined electrical resistivity tomography and magnetic resonance sounding investigation of the surface-water/groundwater interaction in the Urema Graben, Mozambique

Chirindja, Farisse; Dahlin, Torleif; Perttu, Nils; Steinbruch, Franziska; Owen, Richard

doi:10.1007/s10040-016-1422-y

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…The hydrogeophysical methods are up and coming in hydrogeological studies (Chirindja et al, 2016). They have been applied in various conditions, for example in wetlands (Chambers et al, 2014), rivers (Steelman et al, 2015), proglacial moraines (McClymont et al, 2011), karst regions (McCormack et al, 2017), and volcanic systems (Di Napoli et al, 2016;Fikos et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

A first investigation of hydrogeology and hydrogeophysics of the Maqu catchment in the Yellow River source region

Zeng

Lubczynski

et al. 2021

Earth Syst. Sci. Data

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Abstract. The Tibetan Plateau is the source of most of Asia's major rivers and has been called the Asian Water Tower. Detailed knowledge of its hydrogeology is paramount to enable the understanding of groundwater dynamics, which plays a vital role in headwater areas like the Tibetan Plateau. Nevertheless, due to its remoteness and the harsh environment, there is a lack of field survey data to investigate its hydrogeology. In this study, borehole core lithology analysis, soil thickness measurement, an altitude survey, hydrogeological surveys, and hydrogeophysical surveys (e.g. magnetic resonance sounding – MRS, electrical resistivity tomography – ERT, and transient electromagnetic – TEM) were conducted in the Maqu catchment within the Yellow River source region (YRSR). The hydrogeological surveys reveal that groundwater flows from the west to the east, recharging the Yellow River. The hydraulic conductivity ranges from 0.2 to 12.4 m d−1. The MRS sounding results, i.e. water content and hydraulic conductivity, confirmed the presence of an unconfined aquifer in the flat eastern area. Based on TEM results, the depth of the Yellow River deposits was derived at several places in the flat eastern area, ranging from 50 to 208 m. The soil thickness measurements were done in the western mountainous area of the catchment, where hydrogeophysical and hydrogeological surveys were difficult to be carried out. The results indicate that most soil thicknesses, except on the valley floor, are within 1.2 m in the western mountainous area of the catchment, and the soil thickness decreases as the slope increases. These survey data and results can contribute to integrated hydrological modelling and water cycle analysis to improve a full-picture understanding of the water cycle at the Maqu catchment in the YRSR. The raw dataset is freely available at https://doi.org/10.17026/dans-z6t-zpn7 (Li et al., 2020a), and the dataset containing the processed ERT, MRS, and TEM data is also available at the National Tibetan Plateau Data Center with the link https://doi.org/10.11888/Hydro.tpdc.271221 (Li et al., 2020b).

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Section: Introductionmentioning

confidence: 99%

A first investigation of hydrogeology and hydrogeophysics of the Maqu catchment in the Yellow River source region

Zeng

Lubczynski

et al. 2021

Earth Syst. Sci. Data

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“…Nyabeze et al (2010) reported on the occurrence of a low resistivity zone at the Siloam hot spring, from electrical conductivity surveys. Chirindja et al 2016 applied the ERT to investigate the Urema flood plain in Mozambique and confirmed the existence of a semi-confined permeable aquifer confined by a 30 to 40 m clay layer. Chirindja et al 2017 delineated fractured zones in Nampula, Mozambique concluded that the ERT method was better at resolving lateral variations in the bedrock.…”

Section: Introductionmentioning

confidence: 78%

Using Electrical Resistivity Tomography (ERT) to Delineate Subsurface Structures at Siloam Hot Spring in the Soutpansberg Basin, South Africa

Nyabeze¹,

Gwavava²,

Sekiba³

2018

JGG

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Electrical resistivity tomography (ERT) was used to delineate subsurface structures at Siloam hot spring in the Soutpansberg Basin of South Africa. The spring water was reported to be hottest in South Africa. Groundwater with temperature ranging between 63.3 °C and 67.5°C was observed flowing from the spring. Relatively wet areas were noted to the south and north of the spring. Electrical resistivity arrays with Dipole-dipole and Wenner-Schlumberger configurations were used. Current injection and potential dipole separations of 5 m and 10 m were applied across the spring. Inversion results for arrays with the shorter dipole separation of 5 m had better resolution. Resistivity sections were generated from inversion of ERT data. The resistivity values for the low and high resistive zones were ρa < 10 and ρa > 70 Ωm respectively. Sub-horizontal resistivity zones were obtained from the inversion of Wenner-Schlumberger array survey data. High resistivity zones associated with dykes or sills were delineated on Dipole-dipole derived depth sections. Near vertical structures associated with water bearing faults or fractures were delineated at the Siloam hot spring.

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“…Typically, a convergence of the data fit was reached after 5-6 iterations. The data fit is expressed in root mean squared (RMS) error, which represents the relative difference between the measured apparent resistivity data and the calculated model response (Chirindja, Dahlin, Perttu, Steinbruch, & Owen, 2016).…”

Section: Resultsmentioning

confidence: 99%

Very‐high‐resolution electrical resistivity imaging of buried foundations of a Roman villa near Nonnweiler, Germany

Al-Saadi

Schmidt

Becken

et al. 2018

Archaeological Prospection

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Electrical resistivity tomography (ERT) methods have been increasingly used in various shallow depth archaeological prospections in the last few decades. These non‐invasive techniques can save time, costs, and efforts in archaeological prospection and yield detailed images of subsurface anomalies. We present the results of quasi‐three‐dimensional (3D) ERT measurements in an area of a presumed Roman construction, using a dense electrode network of parallel and orthogonal profiles in dipole–dipole configuration. A roll‐along technique has been utilized to cover a large part of the archaeological site with a 25 cm electrode and profile spacing, respectively. We have designed a new field procedure, which used an electrode array fixed in a frame. This facilitated a very efficient field operation, and overall a total of 9648 electrode positions were occupied. The 3D ERT inversion results clearly characterize the main structures of the Roman foundations. We compared our high‐resolution 3D electrical resistivity model with findings from archaeological excavations, which have been done in some parts of the surveyed area. The ERT result coincide well with the excavation results, i.e. the location as well as the vertical and horizontal extensions of the structures could be precisely imaged. The ERT results successfully images most parts of the walls, pits and also smaller internal structures of the Roman building; moreover, excavation ditches that had been refilled prior to the ERT survey are delineated as resistivity heterogeneities as well.

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Combined electrical resistivity tomography and magnetic resonance sounding investigation of the surface-water/groundwater interaction in the Urema Graben, Mozambique

Cited by 6 publications

References 18 publications

A first investigation of hydrogeology and hydrogeophysics of the Maqu catchment in the Yellow River source region

A first investigation of hydrogeology and hydrogeophysics of the Maqu catchment in the Yellow River source region

Using Electrical Resistivity Tomography (ERT) to Delineate Subsurface Structures at Siloam Hot Spring in the Soutpansberg Basin, South Africa

Very‐high‐resolution electrical resistivity imaging of buried foundations of a Roman villa near Nonnweiler, Germany

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