Detection of seepage water around Embankment dam at Farooj using of 2-D Electrical Resistivity Tomography (ERT)
عنوان دوره: نوزدهمین کنفرانس ژئوفیزیک ایران
کد مقاله : 1507-NIGS
نویسندگان
1کارشناس
2گروه زمین شناسی دانشکده علوم دانشگاه فردوسی مشهد
چکیده
Due to the undeniable fact of decline in groundwater resources and the requirement to manage surface and subsurface groundwater, it is necessary to construct a variety of dams and embankment dams. One of the most important issues regarding to dams specially embankment dams is the Seepage. Therefore, the investigation and monitoring system are crucial in order to detect possible threats on the dam. Geophysical methods are non‐destructive exploration techniques to investigate underground situation. The aim of this study is exploiting of electrical resistivity tomography (ERT) to figure out probable seepages around an Embankment dam at Farooj. This geophysical method can be successfully used to delineate and map these seepage pathways within the subsurface of the earth dam. Analyzing and interpretation of the data and final tomograms, it is recognizable that there are anomalous low resistivity zones within the bedrock with resistivity variation from 10 to 160 Ωma which are interpreted as zones of weakness representing preferential flow pathways for water from the impounding reservoir. Five profiles (180, 140, 275,230 and 135 m) designed and surveyed by Wenner-Schelumberger configuration array in the study area. Maximum depth of investigation is about 40 m.
کلیدواژه ها
Title
Detection of seepage water around Embankment dam at Farooj using of 2-D Electrical Resistivity Tomography (ERT)
Authors
mahdi amanian, Mohammad Ali Shahrabi, Naser Hafezi Moghaddas
Abstract
Due to the undeniable fact of decline in groundwater resources and the requirement to manage surface and subsurface groundwater, it is necessary to construct a variety of dams and embankment dams. One of the most important issues regarding to dams specially embankment dams is the Seepage. Therefore, the investigation and monitoring system are crucial in order to detect possible threats on the dam. Geophysical methods are non‐destructive exploration techniques to investigate underground situation. The aim of this study is exploiting of electrical resistivity tomography (ERT) to figure out probable seepages around an Embankment dam at Farooj. This geophysical method can be successfully used to delineate and map these seepage pathways within the subsurface of the earth dam. Analyzing and interpretation of the data and final tomograms, it is recognizable that there are anomalous low resistivity zones within the bedrock with resistivity variation from 10 to 160 Ωma which are interpreted as zones of weakness representing preferential flow pathways for water from the impounding reservoir. Five profiles (180, 140, 275,230 and 135 m) designed and surveyed by Wenner-Schelumberger configuration array in the study area. Maximum depth of investigation is about 40 m.
Keywords
Electrical Resistivity Tomography (ERT), Seepage, Embankment Dam