Monitoring of seepages around dams using geophysical methods: a brief review

Kayode, O.T; Odukoya, Abiodun M.; Adagunodo, T. A.; Adeniji, A. A.

doi:10.1088/1755-1315/173/1/012026

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…A combination of EM, ERT and other tools such as SP, have proven to give quantitative and qualitative interpretation of seepage flow. Performing resistivity and self-potential profiles along several lines across the dam permits obtaining a quasi-three dimensional view of the seepage pattern [21]. It has been concluded from many study cases that different geophysical methods can supplement each other in characterizing and identifying subsurface seepage areas as they relate to the bedrock fracturing, culturally emplaced drainages, and variations in soil type.…”

Section: Monitoring Seepage In Earthfill Damsmentioning

confidence: 99%

Geophysical Methods and their Applications in Dam Safety Monitoring

Adamo¹,

Al‐Ansari²,

Sissakian³

et al. 2020

Journal of Earth Sciences and Geotechnical Engineering

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The use of geophysical methods in dam sites investigations and safety monitory has proved their good value and versatility in many earthfill dam sites as early as the 1920s. In the following years great development has occurred in the methods, application procedures and tools used. They may be considered today as good ways for carrying out observation tasks on existing dams in non-intrusive and much faster and cheaper ways than the traditional geotechnical methods. It is possible using them to discover anomalies in the dam body or its foundation at an early stage and allowing quick intervention repair works. These methods seek to register and present variations in the basic geotechnical material properties in dams such as; bulk density, moisture content, elasticity, mechanical properties of rocks, electrical resistivity and mineralogy and magnetic properties and so forth. Such variations can indicate increasing seepage flow, progression in cracks’ sizes, formation of voids, caverns and other instability manifestations. Depending on how any investigation is carried out and the targeted anomaly, there is now selection of these methods such as: Electromagnetic Profiling (EM), Electrical Resistivity Tomography (ERT), SelfPotential (SP), Ground Penetration Radar (GPR), variety of Seismic Methods (SM) which can be applied using such equipment as in Seismic refraction, Seismic Reflection, Multi Analysis of Rayleigh surface waves (MASW) instruments, or using Refraction Micrometer (ReMi), macro-gravity method, and Cross-Hole Seismic Tomography. In addition, Temperature Measurements and other less used methods can be used like Microgravity measurement, Magnetic Profiling and Radio Magnetotelluric methods. An attempt is made here to cover the details of these methods, their advantages and limitations and to prove their usefulness in many dam sites all over the world. One observed issue is their adaptability to embankment dams more than to concrete dams and their popularity for checking seepage related problems and material changes within dam bodies and their foundations such as formation of voids and sinkholes.

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Section: Monitoring Seepage In Earthfill Damsmentioning

confidence: 99%

Geophysical Methods and their Applications in Dam Safety Monitoring

Adamo¹,

Al‐Ansari²,

Sissakian³

et al. 2020

Journal of Earth Sciences and Geotechnical Engineering

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“…Saltwater intrusion, or the pollution of coastal aquifers by oceanic seawater, has been a significant problem for coastal habitats in many regions all over the world, particularly because fresh groundwater resources are the most important sources of water supply [1]. In coastal areas, seawater intrusion (SWI) is the most significant limiting factor to groundwater extraction [2,3]. The seawater wedge continues to invade inland into coastal aquifers as a consequence of excessive groundwater extraction in coastal aquifers [4,5].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Groundwater Extraction on the Performance of Fractured Concrete Subsurface Dam in Controlling Seawater Intrusion in Coastal Aquifers

Armanuos

Moghazy

Zeleňáková

et al. 2022

Water

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Among the well-known approaches for controlling seawater intrusion during extensive freshwater abstraction from coastal aquifers is the construction of subsurface dams. In the current research, the SEAWAT code is being implemented to examine the impact of groundwater extraction on the effectiveness of a damaged subsurface dam for controlling saltwater intrusion. Simulations were performed numerically to check impact of the subsurface dam height, dam location, well height, well location, abstraction rate, fracture aperture, fracture location, seawater density and fracture dimension on the effectiveness of subsurface dam as a countermeasure to prevent saltwater intrusion in coastal aquifers. Increasing the abstraction rate from 1 × 10−6 to 5 × 10−6 m3/s caused the seawater to advance more into the freshwater, and the loss of effectiveness increased. The minimum and maximum value of loss of subsurface dam effectiveness was recorded to be 34.6% to 93%, respectively, for the abstraction rates from the well equal 1 × 10−6 and 5 × 10−6 m3/s, consequentially. When the dimensionless value of well height location Lw/Ld is increased from 1.0 to 2.0, the effectiveness of the subsurface dam is reduced by around 20%. The findings demonstrate that the well location, well depth, abstraction rate, location of the dam, fracture aperture, and density of saltwater all affect the effectiveness impairment of the fractured subsurface dam for controlling saltwater intrusion. Decision makers could use findings of this research to better manage groundwater resources in coastal aquifers.

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“…The world experience shows that the geophysical methods of non-destructive testing are widely used to determine the safety of hydraulic structures. The applied geophysical methods are sufficiently described in works (Camarero and Moreira, 2017;Dzhurik et al, 2014;Fatoba et al, 2018;Kayode et al, 2018;Kolesnikov et al, 2009;Kolesnikov et al, 2012;Nwokebuihe et al, 2017;Olasunkanmi et al, 2018;Prigara et al, 2012;Prigara et al, 2014;Zumr et al, 2018). An analysis of these works indicates that the seismic methods, georadar sounding and various modifications of electrometric methods are widely used.…”

Section: Introductionmentioning

confidence: 99%

Geophysical survey of earthen dam using the electrical prospecting methods

Akhmetov

Assemov

Shaytorov

2020

Contrib. Geophys. Geod.

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The hydraulic structures for the land reclamation needs and their operation are the objects of careful attention. The water-bearing earth dams of small height pose an extra danger, where the accident occurs the most often. Such facilities should be constantly monitored to prevent the dangerous incidents. The article discusses an alternative method for studying the filtration properties of earth dams by the electrical parameters – resistivity, induced polarization and self-potential. The relative polarizability was used to exclude the influence of electrical resistivity to the induced polarization data. A study of advanced technology to identify the filter zones was carried out on an earthen dam in the Almaty region, Kazakhstan. The measurement data for three profiles are presented as the sections form in the parameters of resistivity and relative polarizability. Their complex interpretation with the respect of self-potential data, is given as a diagram of probable filtration paths. This is possibly due to the local increased watering in the dam loamy body. Then, the electric and self-potential parameters were evaluated to determine the filtering zones. The study results of above parameters have identified several water-saturated zones in the dam body. This technology could be used to estimate the condition of such objects and their engineering-geological monitoring.

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Monitoring of seepages around dams using geophysical methods: a brief review

Cited by 8 publications

References 26 publications

Geophysical Methods and their Applications in Dam Safety Monitoring

Geophysical Methods and their Applications in Dam Safety Monitoring

Assessing the Impact of Groundwater Extraction on the Performance of Fractured Concrete Subsurface Dam in Controlling Seawater Intrusion in Coastal Aquifers

Geophysical survey of earthen dam using the electrical prospecting methods

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