Geophysical investigations on river dikes in Vietnam

Tuyen, Doan Van; Canh, T.; Weller, A.

doi:10.3997/2214-4609.201406473

Cited by 8 publications

(9 citation statements)

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“…Investigative resistivity surveys on embankments to detect structural defects or anomalous seepage are fairly widespread ͑Abuzeid, 1994; Engelbert et al, 1997;Titov et al, 2000;Van Tuyen et al, 2000;Buselli and Lu, 2001;Panthulu et al, 2001;Voronkov et al, 2004͒. However, modeling studies to find out more about typical effects from dam geometries is less common.…”

Section: Introductionmentioning

confidence: 99%

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

2006

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Repeated resistivity measurement is a potentially powerful method for monitoring development of internal erosion and anomalous seepage in earth embankment dams. This study is part of a project to improve current longterm monitoring routines and data interpretation and increasing the understanding when interpreting existing data. This is accomplished by modeling various occurrences typical of embankment structures using properties from two rockfill embankment dams with central till cores in the north of Sweden. The study evaluates the influence from 3D effects created by specific dam geometry and effects of water level fluctuations in the reservoir. Moreover, a comparison between different layout locations is carried out, and detectability of internal erosion scenarios is estimated through modeling of simulated damage situations. Software was especially developed to model apparent resistivity for geometries and material distributions for embankment dams. The model shows that the 3D effect from the embankment geometry is clearly significant when measuring along dam crests. For dams constructed with a conductive core of fine-grained soil and high-resistive rockfill, the effect becomes greatly enhanced. Also, water level fluctuations have a clear effect on apparent resistivities. Only small differences were found between the investigated arrays. A layout along the top of the crest is optimal for monitoring on existing dams, where intrusive investigations are normally avoided, because it is important to pass the current through the conductive core, which is often the main target of investigation. The investigation technique has proven beneficial for improving monitoring routines and increasing the understanding of results from the ongoing monitoring programs. Although the technique and software are developed for dam modeling, it could be used for estimation of 3D influence on any elongated structure with a 2D cross section.

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Section: Introductionmentioning

confidence: 99%

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

2006

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“…Sandy formations in the dike foundations cause seepage effects. Various termite species dig cavities for their nests in the dike body and decrease the stability of the dike (Tuyen et al, 2000). The efficiency of geophysical methods for dike monitoring has to be improved to detect such defects in the dikes.…”

Section: Dike Model With Termite Nestmentioning

confidence: 99%

The effect of dike geometry on different resistivity configurations

Hennig

Weller

Canh

2005

Journal of Applied Geophysics

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“…Aina et al, 1996;Batayneh et al, 2001) and dam status control (e.g. Van Tuyen et al, 2000;Buselli and Lu, 2001;Panthulu et al, 2001;Voronkov et al, 2004;Cho and Yeom, 2007). As regards dam status control investigations, they typically include 2D resistivity profiling along the embankment crest or along the downstream toe, in order to locate anomalies.…”

Section: Introductionmentioning

confidence: 99%

Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam

Sjödahl

Dahlin

Johansson

et al. 2008

Journal of Applied Geophysics

120

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Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hällby was the first Swedish embankment to get a permanently installed monitoring system intended for resistivity measurements. Daily measurements started to take place already in late 1996, which make these long term monitoring data unique. This paper includes examples of long term time series from Hällby along with some evaluation and interpretation techniques used when analysing such monitoring data. Time-lapse inversion was used to focus the variation over time and suppress artefacts due to the resistivity structure. Seasonal resistivity variations inside the dam are obvious. Increasing long term resistivity has been noticed in a particular zone in the left embankment. This zone also exhibits larger seasonal variations relative to other parts of the dam, and the variations are increasing. The observations may relate to an ongoing internal erosion process in the dam. The long term change may be indicative of a change in material properties, and the large and increasing variations may reflect higher and increasing seepage levels. In the years 2004 to 2006 the dam was upgraded and the resistivity system reinstalled. The results indicate that resistivity monitoring may have a chance of detecting development of internal erosion at an early stage.

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Geophysical investigations on river dikes in Vietnam

Cited by 8 publications

References 0 publications

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

The effect of dike geometry on different resistivity configurations

Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam

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