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| Paper Type | : | Research Paper |
| Title | : | Construction And Study Of Aridity Index Based On Temperature & Rainfall Data In Ishurdi, Pabna, Bangladesh. |
| Country | : | Bangladesh |
| Authors | : | M.A Rahman, M.K Alam, M.A Ali, M.S Islam |
 |
: | 10.9790/0990-0110104  |
| Downloads : Times | ||
Abstract: Changing patterns of aridity index have important implications on agriculture of Bangladesh. Aridity can be equates with a deficiency of rainy days and ground moisture. In this study the Aridity Index in Ishurdi Pabna from time period (1996-2011) has been computed using De Martonne (1926). Linear regression method is used to analysis the trend of Temperature & Rainfall and also has been used for projection. A study has been carried out to assess the increases of both temperature and rainfall in the Ishurdi Pabna. The monthly De Martonne (1926) aridity index is used to evaluate the monthly aridity index and it reveals the irrigation months in the study area. The rainfall characteristic is also analyzed which is used to compute the rainfall distribution within a year. An increasing trend of precipitation concentration is also observed in the study area. These results may be a first indication of the precipitation response to global warming.
Keywords: Aridity, Precipitation, Temperature, Irrigation
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| Paper Type | : | Research Paper |
| Title | : | DHI Analysis Using Seismic Frequency Attribute On Field-AN Niger Delta, Nigeria |
| Country | : | Nigeria |
| Authors | : | Yaqub O. Adepoju, Joseph O. Ebeniro, Chukwuemeka N. Ehirim |
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: | 10.9790/0990-0110510 |
| Downloads : Times | ||
Abstract: Effect of hydrocarbon gas on the seismic frequency attributes was studied and considered for applicability as Direct Hydrocarbon indicator (DHI) in the AN reservoir in the Niger Delta basin. Matching Pursuit algorithm for the spectral decomposition was adopted for frequency attributes analysis at 10Hz to 35Hz, along the interpreted reservoir top. Three frequency surface attributes were co-rendering and color blending to highlight the effect of gas in the reservoir. Gas filled sand exhibits distinctly higher frequency amplitudes at low frequency bands of 15Hz to 25Hz despite a subtle hardness of the sand relative to the overburden thick shale. High frequency amplitude expression in the low frequency (15Hz-25Hz) band observed in the gas reservoir is found to be a consistent character of overpressured gas reservoirs within the Niger Delta basin. It was concluded, therefore based on time-frequency seismic character of the gas sand, that frequency attribute can be used as a direct hydrocarbon indicator for the sandstone gas reservoir in the Niger Delta.
Keywords: Seismic attribute, Spectral Decomposition, Niger delta.
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| Paper Type | : | Research Paper |
| Title | : | Direct Current Resistivity Investigation of the Groundwater Potential and Basement Structure in Parts Of Pompo Village, Minna, Nigeria |
| Country | : | Nigeria |
| Authors | : | Chikwelu, E. E., Udensi, E. E. |
|
: | 10.9790/0990-0111119 |
| Downloads : Times | ||
Abstract: A direct current resistivity investigation of parts of Pompo village opposite Federal University of Technology, Gidan Kwano Campus, Minna, was carried out using conventional Vertical Electrical Sounding (VES) method. The aim of this survey is to determining the ground water potential of the area and to locate those areas that could be useful for civil engineering workers. The data obtained were interpreted using computer-based program called Zohdy, which showed a laterally and vertical varying succession of high and low resistive geoelectric layers throughout the area. The resulting (Interpreted) models were used to produce depth to basement map, regolith map, iso-resistivity contour maps at different depth and the vertical sections through each profile. The interpreted earth-layered model suggests the existence of three geoelectric layers with resistivity in the range of 20Ùm-200Ùm and 200Ùm-900Ùm for the first and second layers respectively, while the fresh basement forms the third layers with resistivity value above 1000Ùm. The aquifer system of the study area is generally characterized by relatively low resistivity value between 200Ùm and about 800Ùm in the weathered basement and supported on some VES points by fractured basement and its thickness ranges from 5m to >20m. The most promising region of the site lies on west and south-eastern part, while the civil and the environmental works will be best located at the northern and southern part where the fresh basement is uplifted.
Keywords: groundwater potential, vertical electrical sounding, investigation.
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