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| Paper Type | : | Research Paper |
| Title | : | Determination of Aquifer Hydraulic Parameters from Pumping Test Data Analysis: A Case Study of Akpabuyo Coastal Plain Sand Aquifers, Cross River State, S-E Nigeria. |
| Country | : | Nigeria |
| Authors | : | Amah E. A || Anam G. S |
Abstract:Five boreholes namely IkotEdemOdo (Ak3), IkotOyom (Ak7), IkotMbakara (Ak9), AkwaObioInwang (Ak10), and IkotEkpo (Ak11) within the Akpabuyo Local Government Area of Cross River State were subjected to a number of pumping tests: step drawdown, constant discharge and recovery tests to provide some preliminary estimation of hydraulic parameters for the study area. The results indicate that transmissivity T, hydraulic conductivity k, and specificcapacity SC, ranged from 485.0m2/d to 1346.0m2/d, 9.7m/d to 27.9m/d, 0.02m3/d/m to 346.m3/d/m respectively. Mean static water level (SWL), saturated thickness of the aquifer (b) and borehole drilled depths (BDD) were 30.29m, 48.0m and 64.8m, respectively. The litho-logs of the boreholes confirm that the estimated hydraulic parameters were obtained from unconfined gravelly sandy aquifers underlain by mostly sandy clay (aquitard)..
[1]. Amah, E.A and Esu, E.O (2008). Geophysical and hydrogeological studies of shallow groundwater aquifers of Calabar area, south – eastern Nigeria. International Journal of Environmental Science. 4(2), 78 – 90.
[2]. Allen, J. R. L. (1985). Late Quaternary Niger Delta and adjacent areas, sedimentary environments and lithofacies. AAPG Bull, vol.49, p 547 -600.
[3]. Edet, A. E. and Okereke, C. S. (2002).Delineation of shallow groundwater aquifers in the coastal plain sands of Calabar area (Southern Nigeria).Journal of African Earth Sciences (35), 438p.
[4]. Etu – Efeotor, J. O. (1981). Preliminary Hydro Chemical investigations of sub- surface waters in parts of the Niger Delta. Journal of Mining and Geology vol. 18(1) 103 -105.
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| Paper Type | : | Research Paper |
| Title | : | Geological mapping in semi-arid regions with low spectral contrast surfaces using ASTER data |
| Country | : | Tunisia |
| Authors | : | Mourad El Koundi || Pascal Allemand || Fouad Zargouni |
Abstract: Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) is largely used for geological mapping and lithological discriminations because of its relative fine resolution and its relative broad spectral range (14 bands). This study investigated the use of ASTER data for geological mapping at scale 1:50.000 in the Sahel block (eastern Tunisia). This region is characterised by sedimentary outcropping series with relative low tone contrast. Based on mineral composition of outcropping series, five indices were used in addition to VNIR and SWIR corrected bands for classification process. A Minimum Noise Fraction Transformation was performed to increase S/N ratio and to reduce redundancy. Eleven spectral endmembers representing lithostratigraphic units were used as training classes for a supervised classification using the Spectral Angle Mapping (SAM) algorithm. Results were validated using field verification and accuracy assessment. With an overall accuracy of 85.67% and a Kappa of 0.791, produced map is estimated to be accurate.
Keywords – ASTER, geological mapping, spectral analysis, spectral low contrast surfaces, Tunisian Sahel
[1]. A. Hirano, R. Welch and H. Lang, Mapping from ASTER stereo image data: DEM validation and accuracy assessment, ISPRS Journal of Photogrammetry & Remote Sensing, 57, 2003, 356– 370.
[2]. M. Abrams, S. Hook and B. Ramachandran, ASTER User Handbook Version 2 (Jet Propulsion Laboratory/California Institute of Technology: California 2001).
[3]. Y. Yamaguchi, A.B. Kahle, H. Tsu, T. Kawakami and M. Pniel, Overview of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), IEEE Transactions on Geoscience and Remote Sensing, 36(4), 1998, 1062-1071.
[4]. L.C. Rowan and J.C. Mars, Lithologic mapping in the Mountain Pass, California area using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data, Remote Sensing of Environment, 84(3), 2003, 350–366.
[5]. R.D. Hewson, T.J. Cudahy, S. Mizuhiko, K. Ueda and A.J. Mauger, Seamless geological map generation using ASTER in the Broken Hill-Curnamona province of Australia, Remote Sensing of Environment, 99(1-2), 2005, 159-172.
[6]. R.D. Hewson, T.J. Cudahy and J.F. Huntington (2001) Geologic and alteration mapping at Mt Fitton, South Australia, using ASTER satellite-borne data, in: Geoscience and Remote Sensing Symposium, 2001. IGARSS '01. IEEE 2001 International, pp. 3..
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| Paper Type | : | Research Paper |
| Title | : | Sub-surface Structural Configuration of the Chitradurga Schist Belt as Inferred from Bouguer Gravity data analysis |
| Country | : | India |
| Authors | : | K.Bhagya || G.Ramadass |
Abstract: The NW-SE trending Chitradurga Schist Belt (CSB) from Sarangapatnam to Gadag in Dharwar Craton, of Indian peninsular Shield is interesting both from the Geological and as well as Geophysical points of view. However relatively few Geophysical studies over the Chitradurga Schist Belt have been reported. In this paper a new Bouguer gravity map of Chitradurga -Gadag region were analysed qualitatively and quantitatively to understand the geological structures in this region. The qualitative analysis consist of gradient analysis (Horizontal, Vertical ,Analytical signal and Tilt derivatives ) were brought out the disposition of the schist belt contacts, shear zones, two (F1 & F2) major deep faults are running NW-SE , nine ( f1 to f9) small local faults trending in NW-SE, N-S , five gravity lows (L1 to L5) and three gravity high (H1 to H3) lineaments were delineated. Based on these inferred features comparing with known geological control, schist belt as three mineral potentional zones were delineated, northern (A), Central (B) and (C) zones.
[1]. Anand S.P. and Mita Rajaram, 2003. Study of Aeromagnetic data over part of eastern ghat mobile belt and Bastar Craton.Gondwana; Res.6, PP-859-865.
[2]. A.P .Singh, Mishra,D.C., Laxman, G., 2003 Apparent Density Mapping and 3-D Gravity Inversion of Dharwar Crustal Province. J.Ind. Geophys.Union, Vol.7. No.1, pp.1-9.
[3]. Anand, S.P. and Rajaram mita (2002) Aeromagnetic data to probe the Dharwar Craton. Curr. Sci., v.83(2), pp.162-163.
[4]. Babu.V.R.R.M. 2001. Plate tectonic history of the Indian plate Nellore-Khammam schist belt. Bengaluru; Indian Academy of Geosciences.PP-1-183
[5]. Chadwick.B., Vasudev.V.N and Hegde.G.V., 2000. The Dharwar Craton, southerh India interpreted as the result of late Archean oblique Convergence, Precambrian Reseach.99 (2000), PP.91-111. [6]. Gupta.M.L., Heat flow in the Indian Peninsula—its geological and geophysical implications. - Tectonophysics, 1982 – Elsevier., Volume 83, Issues 1–2, 10 March 1982, Pages 71–90.