Omphile Sidney Lekone , Nata T. Tafesse , Rubeni Tawanda Ranganai , Kebabonye Laletsang , R.B.M. Mapeo , Tebogo L. Masaka
{"title":"在博茨瓦纳东北部的 Dukwi 井田使用地质电法估算含水层水力参数","authors":"Omphile Sidney Lekone , Nata T. Tafesse , Rubeni Tawanda Ranganai , Kebabonye Laletsang , R.B.M. Mapeo , Tebogo L. Masaka","doi":"10.1016/j.jafrearsci.2024.105328","DOIUrl":null,"url":null,"abstract":"<div><p>A hydro-geophysical investigation was carried out in the northeastern parts of Botswana, in a wellfield called Dukwi, with the aim of estimating the aquifer hydraulic parameters employing the geo-electrical method. A Schlumberger electrode configuration of 16 vertical electrical soundings (VES) was carried out in the Dukwi Wellfield. The data were recorded with a maximum AB/2 spacing of 500 m and processed using the InterpexRESIXIP<sup>tm</sup> software. In addition, physicochemical parameter measurements were carried out for 19 groundwater samples in the field. Aquifer hydraulic parameters, like hydraulic conductivity (K) and transmissivity (T), were computed from the pumping test data. An interpretation was made using statistics, including linear regression analysis. The major aquifer is the Mea Arkose Formation, and its estimated hydraulic conductivity and transmissivity ranges from 15.4 to 47.3 m/day and 539.9–2113.9 m<sup>2</sup>/day, respectively. The aquifer transverse resistance (Tr) and longitudinal conductance (S) of the rocks overlying the aquifer ranges from 945 to 2440 Ωm<sup>2</sup> and 1.5 to 9.7 Ω<sup>-1</sup>, respectively. The R<sup>2</sup> value for the geo-electrical and pumping test K and T values are 0.689 and 0.896, respectively. The estimated K has a positive and strong correlation (R<sup>2</sup> = 0.946) with the resistivity. A strong positive correlation (R<sup>2</sup> = 0.892) is obtained between the estimated T and Tr of the aquifer. On the basis of these correlations, equations that relate the resistivity of the aquifer to its hydraulic parameters were formulated. These equations enable the evaluation of aquifer hydraulic parameters where there is a lack of pumping test data. Furthermore, these equations can be used in other parts of the country and in regions elsewhere that have similar geological and hydrogeological setups.</p></div>","PeriodicalId":14874,"journal":{"name":"Journal of African Earth Sciences","volume":"217 ","pages":"Article 105328"},"PeriodicalIF":2.2000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Estimation of aquifer hydraulic parameters using geoelectric method in the Dukwi wellfields, northeastern Botswana\",\"authors\":\"Omphile Sidney Lekone , Nata T. Tafesse , Rubeni Tawanda Ranganai , Kebabonye Laletsang , R.B.M. Mapeo , Tebogo L. Masaka\",\"doi\":\"10.1016/j.jafrearsci.2024.105328\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A hydro-geophysical investigation was carried out in the northeastern parts of Botswana, in a wellfield called Dukwi, with the aim of estimating the aquifer hydraulic parameters employing the geo-electrical method. A Schlumberger electrode configuration of 16 vertical electrical soundings (VES) was carried out in the Dukwi Wellfield. The data were recorded with a maximum AB/2 spacing of 500 m and processed using the InterpexRESIXIP<sup>tm</sup> software. In addition, physicochemical parameter measurements were carried out for 19 groundwater samples in the field. Aquifer hydraulic parameters, like hydraulic conductivity (K) and transmissivity (T), were computed from the pumping test data. An interpretation was made using statistics, including linear regression analysis. The major aquifer is the Mea Arkose Formation, and its estimated hydraulic conductivity and transmissivity ranges from 15.4 to 47.3 m/day and 539.9–2113.9 m<sup>2</sup>/day, respectively. The aquifer transverse resistance (Tr) and longitudinal conductance (S) of the rocks overlying the aquifer ranges from 945 to 2440 Ωm<sup>2</sup> and 1.5 to 9.7 Ω<sup>-1</sup>, respectively. The R<sup>2</sup> value for the geo-electrical and pumping test K and T values are 0.689 and 0.896, respectively. The estimated K has a positive and strong correlation (R<sup>2</sup> = 0.946) with the resistivity. A strong positive correlation (R<sup>2</sup> = 0.892) is obtained between the estimated T and Tr of the aquifer. On the basis of these correlations, equations that relate the resistivity of the aquifer to its hydraulic parameters were formulated. These equations enable the evaluation of aquifer hydraulic parameters where there is a lack of pumping test data. Furthermore, these equations can be used in other parts of the country and in regions elsewhere that have similar geological and hydrogeological setups.</p></div>\",\"PeriodicalId\":14874,\"journal\":{\"name\":\"Journal of African Earth Sciences\",\"volume\":\"217 \",\"pages\":\"Article 105328\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2024-06-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of African Earth Sciences\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1464343X24001614\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1464343X24001614","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Estimation of aquifer hydraulic parameters using geoelectric method in the Dukwi wellfields, northeastern Botswana
A hydro-geophysical investigation was carried out in the northeastern parts of Botswana, in a wellfield called Dukwi, with the aim of estimating the aquifer hydraulic parameters employing the geo-electrical method. A Schlumberger electrode configuration of 16 vertical electrical soundings (VES) was carried out in the Dukwi Wellfield. The data were recorded with a maximum AB/2 spacing of 500 m and processed using the InterpexRESIXIPtm software. In addition, physicochemical parameter measurements were carried out for 19 groundwater samples in the field. Aquifer hydraulic parameters, like hydraulic conductivity (K) and transmissivity (T), were computed from the pumping test data. An interpretation was made using statistics, including linear regression analysis. The major aquifer is the Mea Arkose Formation, and its estimated hydraulic conductivity and transmissivity ranges from 15.4 to 47.3 m/day and 539.9–2113.9 m2/day, respectively. The aquifer transverse resistance (Tr) and longitudinal conductance (S) of the rocks overlying the aquifer ranges from 945 to 2440 Ωm2 and 1.5 to 9.7 Ω-1, respectively. The R2 value for the geo-electrical and pumping test K and T values are 0.689 and 0.896, respectively. The estimated K has a positive and strong correlation (R2 = 0.946) with the resistivity. A strong positive correlation (R2 = 0.892) is obtained between the estimated T and Tr of the aquifer. On the basis of these correlations, equations that relate the resistivity of the aquifer to its hydraulic parameters were formulated. These equations enable the evaluation of aquifer hydraulic parameters where there is a lack of pumping test data. Furthermore, these equations can be used in other parts of the country and in regions elsewhere that have similar geological and hydrogeological setups.
期刊介绍:
The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa.
The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.