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Hydrogeophysical Studies of Central Kwara State Basement Complex of Nigeria.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Hydrogeophysical Studies of Central Kwara State Basement Complex of Nigeria./
作者:	Bawallah, Musa Adesola.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	238 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-03, Section: B.
Contained By:	Dissertations Abstracts International80-03B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10973530
ISBN:	9780438525641

Hydrogeophysical Studies of Central Kwara State Basement Complex of Nigeria.
Bawallah, Musa Adesola.

Hydrogeophysical Studies of Central Kwara State Basement Complex of Nigeria. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 238 p.

Source: Dissertations Abstracts International, Volume: 80-03, Section: B.

Thesis (Ph.D.)--Kwara State University (Nigeria), 2018.

This item must not be sold to any third party vendors.

The quest to meet the required groundwater need of citizens of Nigeria, especially Central Kwara State for both domestic and industrial applications in the face of scarce water resources, occasioned by incessant borehole failure/low yield, has prompted researches for viable source of water. The central Kwara state falls within the basement complex region of Nigeria known as the hard rock terrain, where availability of groundwater is dependent mainly on structural features (such as fracture, weathered basement, etc.), and their dispositions to yield groundwater. In this study, an integrated geophysical approach involving airborne and ground magnetics, landsat imaging, very-low-frequency electromagnetic (VLF-EM) and vertical electrical sounding (VES) has been employed to establish geologic features associated with groundwater occurrence in four (4) local government areas of Central Kwara State. Twenty VLF-EM profiles, twenty magnetic profiles and seventy three VES were conducted in W-E orientation across the geologic strike within settlements in the area, with traverse length 500 to 3000 m and spread 200 to 650 m (AB) respectively. The ABEM Wadi VLF-EM and SAS 4000 Terrameter equipment, and total field intensity magnetometer G19T were used to measure conductive/resistive variation and magnetic susceptibility of various lithologic units respectively. A combination of the Dar Zarouk parameters such as total traverse resistance (T), longitudinal conductance (S), longitudinal resistivity (ρL), transverse resistivity (ρI) and coefficient of anisotropy ( λ ) were determined from the geoelectric parameters while the product of coefficient of anisotropy and total traverse resistance were employed to determine the yield index. The geoelectric sequence revealed three distinctive characteristics of the lithologic units with resistivity parameters ranging between 350 to 1900 Ωm, 7.7 to 99.1 Ωm and above 3000 Ωm; making up the topsoil, weathered layer and bedrock respectively. The topsoil is interpreted as laterite/hard pan within thickness range of 0.4 and 2.2 m while the weathered layer zone ranged between 0.9 to 36.1 m thickness respectively; making the overburden of the area with thickness range of 1.4 to 42.7 m. The bedrock resistivity ranges from 400 Ωm to 8192 Ωm, indicative of weathered/fractured and fresh basement respectively. Groundwater yield Capacity (GW.Y. C) values ranged from 32.38 to 5733.0 with 32 to 350, 350 to 450, 450 to 850, 850 to 1750 and 1750 to 3000 and above representing dry/abortive, extremely low yield, low yield, medium yield and high yield respectively. From the results, it is concluded that the north-eastern and the central region of the area have the highest prospect while part of the north western, north central and the south eastern parts have medium prospect and the rest of the area has prospect for low yield except for the south western end. Part of the south western and the middle part of the north eastern part have lean or least prospect for groundwater. The orientations of the lineament are in north-eastern and south-western direction, especially for the macro structures which account for about 2 to 4% of the structures. These macro structures occur mainly at the North-eastern end, down the South-eastern part of the study area with length of about 5 - 18 km. The micro lineaments account for about 5 to 10% of the total structures and they are oriented in north-eastern and south-western direction with length of about 800 m to 5 km, while mini structures are multi-directional, while some are found west-eastern direction and some in north-eastern and south-western directions. They account for about 80 to 84% of the total structures with length of about 200 m to 3 km. Drainage pattern reflects surface characteristics as well as subsurface formation. Most of the streams and river tributaries follow directions that are different from that of lineaments which is an indication that the streams are not structurally controlled. The stream and rivers flow nearly East to West direction (multidirectional manner). It is concluded that there exists ineffective communication between a major source of recharge (stream/rivers) and the lineament, therefore a situation of low recharge is inevitable. Since all other contributing factors to groundwater yield are expected to be affected, this may probably accounts for one of the major reasons for the low groundwater potential within the study area.

ISBN: 9780438525641Subjects--Topical Terms:

535228
Geophysics.

Hydrogeophysical Studies of Central Kwara State Basement Complex of Nigeria.
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520 $a The quest to meet the required groundwater need of citizens of Nigeria, especially Central Kwara State for both domestic and industrial applications in the face of scarce water resources, occasioned by incessant borehole failure/low yield, has prompted researches for viable source of water. The central Kwara state falls within the basement complex region of Nigeria known as the hard rock terrain, where availability of groundwater is dependent mainly on structural features (such as fracture, weathered basement, etc.), and their dispositions to yield groundwater. In this study, an integrated geophysical approach involving airborne and ground magnetics, landsat imaging, very-low-frequency electromagnetic (VLF-EM) and vertical electrical sounding (VES) has been employed to establish geologic features associated with groundwater occurrence in four (4) local government areas of Central Kwara State. Twenty VLF-EM profiles, twenty magnetic profiles and seventy three VES were conducted in W-E orientation across the geologic strike within settlements in the area, with traverse length 500 to 3000 m and spread 200 to 650 m (AB) respectively. The ABEM Wadi VLF-EM and SAS 4000 Terrameter equipment, and total field intensity magnetometer G19T were used to measure conductive/resistive variation and magnetic susceptibility of various lithologic units respectively. A combination of the Dar Zarouk parameters such as total traverse resistance (T), longitudinal conductance (S), longitudinal resistivity (ρL), transverse resistivity (ρI) and coefficient of anisotropy ( λ ) were determined from the geoelectric parameters while the product of coefficient of anisotropy and total traverse resistance were employed to determine the yield index. The geoelectric sequence revealed three distinctive characteristics of the lithologic units with resistivity parameters ranging between 350 to 1900 Ωm, 7.7 to 99.1 Ωm and above 3000 Ωm; making up the topsoil, weathered layer and bedrock respectively. The topsoil is interpreted as laterite/hard pan within thickness range of 0.4 and 2.2 m while the weathered layer zone ranged between 0.9 to 36.1 m thickness respectively; making the overburden of the area with thickness range of 1.4 to 42.7 m. The bedrock resistivity ranges from 400 Ωm to 8192 Ωm, indicative of weathered/fractured and fresh basement respectively. Groundwater yield Capacity (GW.Y. C) values ranged from 32.38 to 5733.0 with 32 to 350, 350 to 450, 450 to 850, 850 to 1750 and 1750 to 3000 and above representing dry/abortive, extremely low yield, low yield, medium yield and high yield respectively. From the results, it is concluded that the north-eastern and the central region of the area have the highest prospect while part of the north western, north central and the south eastern parts have medium prospect and the rest of the area has prospect for low yield except for the south western end. Part of the south western and the middle part of the north eastern part have lean or least prospect for groundwater. The orientations of the lineament are in north-eastern and south-western direction, especially for the macro structures which account for about 2 to 4% of the structures. These macro structures occur mainly at the North-eastern end, down the South-eastern part of the study area with length of about 5 - 18 km. The micro lineaments account for about 5 to 10% of the total structures and they are oriented in north-eastern and south-western direction with length of about 800 m to 5 km, while mini structures are multi-directional, while some are found west-eastern direction and some in north-eastern and south-western directions. They account for about 80 to 84% of the total structures with length of about 200 m to 3 km. Drainage pattern reflects surface characteristics as well as subsurface formation. Most of the streams and river tributaries follow directions that are different from that of lineaments which is an indication that the streams are not structurally controlled. The stream and rivers flow nearly East to West direction (multidirectional manner). It is concluded that there exists ineffective communication between a major source of recharge (stream/rivers) and the lineament, therefore a situation of low recharge is inevitable. Since all other contributing factors to groundwater yield are expected to be affected, this may probably accounts for one of the major reasons for the low groundwater potential within the study area.
590 $a School code: 2005.
650 4 $a Geophysics. $3 535228
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710 2 $a Kwara State University (Nigeria). $b Pure and Applied Sciences. $3 3431501
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793 $a English
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