Microgravimetric and GPR surveys for detection of unconsolidated zones in a levee

Łój, Monika; Porzucek, Sławomir; Gołębiowski, Tomisław; Everett, Mark E.

doi:10.1051/e3sconf/20186601022

Cited by 4 publications

(2 citation statements)

References 6 publications

(9 reference statements)

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“…As far as we know, there are no recommendations on the use of the high-resolution seismic reflection (HRSR) [29,30] for the inspection of dikes, but this technique seems to be a useful geophysical method for the detection of small unconsolidated zones, due to its high resolution [31][32][33]. Occasionally, other geophysical methods are used, e.g., the microgravimetric technique [34], fast growing capacitively coupled resistivity (CCR) [35][36][37][38] method, very low frequency (VLF) method, radio-magnetotelluric (MT) method, infrared (IR) method, self-potentials (SP) method, and LiDAR technique [39,40].…”

Section: Introductionmentioning

confidence: 99%

Application of Complex Geophysical Methods for the Detection of Unconsolidated Zones in Flood Dikes

2022

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The flood levees in the vicinity of Krakow city (Poland) are, in some places, over 100 years old. Thereupon, in the flood dike, and its subsoil, can appear unconsolidated zones, which, during the flood stage, can be a simple way of water flow and/or even can be the place where the levee body will be destroyed. This phenomenon took place in Wawrzeńczyce village, near Krakow city, during the flood in 2010. The geophysical research was carried out, in order to develop a methodology of recognition of potential areas where the levee body can be damaged. The geophysical surveys were conducted with the use of electrical and electromagnetic methods, as well as utilizing the seismic method. The general identification of examined media was realized by the electrical resistivity tomography (ERT) method. The ERT surveys were supplemented by capacitively-coupled resistivity (CCR) measurements, in order to analyze the usefulness of the CCR method for the examination of river dikes and reduction of interpretation ambiguity. The ground penetrating radar (GPR) method detected small anomalies in the body dike, due to the very high resolution of this method, which were not detected by the ERT and CCR techniques. During GPR surveys, non-standard measurement techniques were applied. Finally, the high-resolution seismic reflection (HRSR) method provided a clear and high-resolution image of the dike structure up to the water table and assisted with the identification of the hazard non-consolidated zones.

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Section: Introductionmentioning

confidence: 99%

Application of Complex Geophysical Methods for the Detection of Unconsolidated Zones in Flood Dikes

2022

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“…The electromagnetic profiling (EMP) method also called the ground conductivity meter (GCM) is less popular than the previous one and It uses to relatively fast recognition of the levee [5]. Occasionally, other geophysical methods were used, e.g., seismic surveys, i.e., reflection, refraction and MASW measurements [14], microgravimetric technique [15], very low frequency (VLF) method, radio-magnetotelluric (MT) method, infrared (IR) method, self-potentials (SP) method, acoustic emission (AE) [16] and LiDAR technique [6,17].…”

Section: Introductionmentioning

confidence: 99%

Application of Combined Geophysical Methods for the Examination of a Water Dam Subsoil

Gołębiowski

Piwakowski

Ćwiklik

et al. 2021

Water

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The paper presents the results of geophysical measurements that were carried out in the vicinity of the water dam/water reservoir supplying the city of Bielsko-Biala with drinking water. The measurements were performed in order to non-invasively detect faults, fractured zones and areas filled with breccia, which may be, at the same time, a preferential path of groundwater flow. The aforementioned factors influence the stability of the dam. The general identification of the examined media was realized by the electrical resistivity tomography method. The ERT surveys were supplemented by capacitively-coupled resistivity. The electrical methods allowed them to recognize geological settings, indicate possible fault locations, and point out the fault plane as a path of water flow. The ground penetrating radar method detected fractured and filled water areas and underground water paths in the dam’s forefield as a result of the method’s very high resolution. The high resolution seismic reflection method provided a clear and high resolution image of the relatively deep geological structure and verified a location and the run of the faults. In general, the complex geophysical-geological interpretation enabled classification of the unconsolidated/fractured zones associated with faults as a place where the erosion process is the most intense and can bring danger on the dam. Finally, it was confirmed that the area should be the subject of geophysical monitoring.

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Ground penetrating radar use in flood prevention

Tomecka‐Suchoń

2019

Acta Geophys.

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The main goal of the work is to create an automatic method of locating weak zones within flood embankments structure based on ground penetrating radar (GPR) measurements. The presented research shows the possibilities of using advanced methods of GPR signal processing and its analysis with the help of signal attributes for detecting zones threatening the stability of the structure of flood embankments. Obtained results may help in quick detection of potential weak zones of the embankments and consequently give means to ameliorate them, which may prevent damage to the embankments during rise in the level of river water. The presented analyses were carried out on GPR data obtained for the flood banks of the Rudawa River (Kraków, Poland) in the area of their visible degradation. The use of signal attributes, such as Energy, instantaneous frequency, similarity, curvature gradient, dominant frequency, allowed initial indication of anomalous zones threatening the stability of embankment. Advanced processing supported by the use of advanced filters such as GLCM, Grubbs filter threshold and Convolve Prewitt helped in the analysis of the structure of the embankments. Artificial neural networks (ANNs) in the supervised and unsupervised variants were used to perform the automatic classification of weakened zones within the embankments. The results demonstrated the usefulness of GPR geophysical method through integration of ANN in the analysis of the data.

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Microgravimetric and GPR surveys for detection of unconsolidated zones in a levee

Cited by 4 publications

References 6 publications

Application of Complex Geophysical Methods for the Detection of Unconsolidated Zones in Flood Dikes

Application of Complex Geophysical Methods for the Detection of Unconsolidated Zones in Flood Dikes

Application of Combined Geophysical Methods for the Examination of a Water Dam Subsoil

Ground penetrating radar use in flood prevention

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