Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments
Some vertical electrical sounding (VES) data from tectono-thermal environments usually plot anomalously on a VES curve, thereby distorting the curve trend at the points of their occurrence. These datasets usually plot noisily in the form of a sudden rise and drop in electrical resistivity values. They constitute abnormal datasets that are usually deleted to recover trends and consequently develop confidence in both the datasets and the modelling and interpretational processes. This study was conducted to assess their origin and consequently gain an understanding of their contributions to groundwater accumulation and transmission in saprock aquifers. The results, supported by co-located drilling and pumping test data, show that these datasets are indicators of subsurface conditions where high-resistivity unconformal structures directly overlie saturated (low-resistivity) porous media, provided that the resistivity of the first breakout point is less than those from subsequent points. Remote sensing data reveal that these types of curves are common in hard rock and metasedimentary environments. Borehole groundwater yields can also be assessed qualitatively from the number and trend of breakoff points. The integrity of the breakoff points must be affirmed by using more sensitive equipment for data acquisition and repeating the measuring process using different potential electrode separations and—where possible—VES profile orientation.
Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments
Some vertical electrical sounding (VES) data from tectono-thermal environments usually plot anomalously on a VES curve, thereby distorting the curve trend at the points of their occurrence. These datasets usually plot noisily in the form of a sudden rise and drop in electrical resistivity values. They constitute abnormal datasets that are usually deleted to recover trends and consequently develop confidence in both the datasets and the modelling and interpretational processes. This study was conducted to assess their origin and consequently gain an understanding of their contributions to groundwater accumulation and transmission in saprock aquifers. The results, supported by co-located drilling and pumping test data, show that these datasets are indicators of subsurface conditions where high-resistivity unconformal structures directly overlie saturated (low-resistivity) porous media, provided that the resistivity of the first breakout point is less than those from subsequent points. Remote sensing data reveal that these types of curves are common in hard rock and metasedimentary environments. Borehole groundwater yields can also be assessed qualitatively from the number and trend of breakoff points. The integrity of the breakoff points must be affirmed by using more sensitive equipment for data acquisition and repeating the measuring process using different potential electrode separations and—where possible—VES profile orientation.
Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments
Anthony E. Akpan (Autor:in) / Stephen E. Ekwok (Autor:in) / Ubong C. Ben (Autor:in) / Ebong D. Ebong (Autor:in) / Jewel E. Thomas (Autor:in) / Aniekan M. Ekanem (Autor:in) / Nyakno J. George (Autor:in) / Kamal Abdelrahman (Autor:in) / Mohammed S. Fnais (Autor:in) / Ahmed M. Eldosouky (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Metadata by DOAJ is licensed under CC BY-SA 1.0
Safeguarding groundwater from arseniferous aquifers
| British Library Conference Proceedings | 1996
Groundwater Hydraulics of Extensive Aquifers
| Elsevier | 1973
Groundwater hydraulics of extensive aquifers
| UB Braunschweig | 1972
Groundwater ages in coastal aquifers
| British Library Online Contents | 2013
Groundwater hydraulics of extensive aquifers
| TIBKAT | 1983