scholarly journals Application of Electrical Resistivity Tomography Technique for Characterizing Leakage Problem in Abu Baara Earth Dam, Syria

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Walid Al-Fares

Electrical Resistivity Tomography (ERT) survey was carried out at Abu Baara earth dam in northwestern Syria, in order to delineate potential pathways of leakage occurring through the subsurface structure close to the dam body. The survey was performed along two straight measuring profiles of 715 and 430 m length in up- and downstream sides of the dam’s embankment. The analysis of the inverted ERT sections revealed the presence of fractured and karstified limestone rocks which constitute the shallow bedrock of the dam reservoir. Several subsurface structural anomalies were identified within the fractured bedrock, most of which are associated with probable karstic cavities, voids, and discontinuity features developed within the carbonates rocks. Moreover, results also showed the occurrence of a distinguished subsiding structure coinciding with main valley course. Accordingly, it is believed that the bedrock and the other detected features are the main potential causes of water leakage from the dam’s reservoir.

2018 ◽  
Vol 36 (2) ◽  
pp. 111
Author(s):  
Christ Jesus Barriga Paria ◽  
Jorge Pantaleon Barriga Gamarra

ABSTRACT. Huamantanga located approximately 3390 msnm in the central highlands of Peru, a district that promotes the sowing and harvesting of water called “mamanteo”, Inca ancestral water management technique to derive water from a ravine during the rainy season, to places with a high infiltration. On the other hand the construction of a dam, named with the same name, was built for the storage water due to the increase of the agrarian activities, nevertheless worrisome leaks were observed by which electrical resistivity tomography in these possible zones were realized Distributed four profiles, one parallel to the axis of the dam, 10 to 15 meters upstream of the first profile, on the outer slope and the fourth profile approximately 10 meters above the spring. In this way, the resistivity measurements were performed for each of the four lines of Tomographic Electric, in order to obtain detailed information of the stratigraphy in the study area and to identify the georesistive anomalies caused by tectonic or geological faults, Reflect as areas of low resistivities or anomalies. Analyzed the area of study were found considerable local fractures which were recommended to be quickly waterproofed because the risk of infiltrations is latent. Keywords: infiltration, fracture, geophysical investigation, electrical method.    RESUMO. Huamantanga localizado aproximadamente a 3390 msnm no centro da serra do Peru, distrito que promove o cultivo e colheita de água chamado de “mamanteo”, atividade incaica para derivar um fluxo de água durante a estação chuvosa, para locais com alta infiltração. Além disso, a construção de uma barragem, chamado pelo mesmo nome, foi construído para armazenar água devido ao aumento das atividades agrícolas, foram observados, no entanto vazamentos preocupantes foram observados para os quais foram realizados Tomografia Eléctrica nessas áreas potenciais, foram distribuído quatro perfis, uma paralela ao eixo da barragem de 10 a 15 metros a montante a partir do primeiro perfil, no lado exterior e o quarto perfil aproximadamente 10 metros acima da fonte de água. Assim, as medições de resistividade foram feitas para cada uma das 4 linhas de Tomografia Eléctrica, a fim de obter informações pormenorizadas sobre a estratigrafia na área de estudo e identificar anomalias georesistivas causadas por tectônismo ou falhas geológicas, que refletem como áreas de resistividades tão baixas ou anomalias. Analisada a área de estudo foram encontrados fratura locais consideráveis, que foram recomendadas a ser impermeabilizadas rapidamente, porque o risco de infiltrações é latente.  Palavras-chave: infiltração, fratura, investigação geofísica, método elétrico.    


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