مجلة النيلين لعلوم الارض
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Item Determination of Hydrogeological Parameters of Alluvial and Disa Sandstone Aquifers of West Darfur State, Western Sudan(Faculty of Petroleum and Minerals, 2019) Khalid M. M. Ali, Abdalla E. El Sheikh; Sami O. H. El KhidirThe study area concerns with the hydrogeological parameters of the alluvial aquifer and Disa Sandstone aquifer in West Darfur State, western Sudan. The western Darfur region is characterized by steeply slope topography of crystalline basement complexes terrain; hence, the bulk of surface water lost due to surface runoff and evaporation resulted in extremely shortage in water supply. The objectives of the current study are to investigate the water - bearing formations in order to define aquifers parameters and to assess water levels fluctuations in alluvial sedimentary aquifer systems. In this study the determination of hydrogeological parameters of alluvial and Disa Sandstone aquifers supported with the digital image processing of remotely sensed data, GIS - spatial analysis are applied to satisfy the requirements of the objectives. The Disa sandstone Formation covers an area of 300 km2 in West Darfur and extends into Chad. Approximately, the transmissivity values of alluvial deposits vary from 15 m2/d to 32 m2/d and sandstone varies between 15 m2/d, and 32 m2/d with average value of 18 m2/d. The specific yield in the alluvial aquifer ranges between 6% to 28%. The transmissivity (T) for Disa Sandstone is ranging from 17 m2/d to 88 m2/d with average value of 43 m2/d, while the specific yield for this aquifer ranges between 21% and 27% in Disa Sandstone. The boreholes drilled in Disa Sandstone reaches the Basement Rocks at depths range from 70m to 145m from the surface.Item Site Selection of Wastewater Treatment Plant using RS/GIS data and Multi- Criteria Analysis (MCA): Case Study Omdurman City, Khartoum State, Sudan(جامعة النيلين, 2017) Omer O. A. Abdalla; Sami O. H. El KhidirAbstract: Omdurman city is one of the biggest cities in Sudan in term of area and population. The city witness a rapid growth of population coupled with huge aerial expansion. This situation creates big environmental complications and hazards. One of biggest pollution issues in the city is the lack of modern and efficient Waste Water Treatment Plant (WWTP). The purpose of this study is to build a decision making model for selecting the optimal site for a WWTP utilizing the remote sensing and GIS data and analysis coupled with the Multi- Criteria Analysis (MCA). The utilized data comprise the remote sensing data of optical multispectral satellite imageries and the digital elevation model coupled with vector data of land used and land cover (LU/LC) layers. Various positive and exclamations criteria have been built from the RS/GIS data, while the analytic hierarchy process (AHP) was used to apply the weights for each criterion and sub criterion, in order to get the best result and find the optimal site. The obtained result presents three sites of high weights in the main criteria and lows in exclamation ones representing in-preferable sites; the sites are ranked as the first, second and third rank, which are located in the west, south and north of Omdurman city, respectively. Each of the three sites contains subzones of very suitable, suitable and unsuitable, where the first site renders high suitability over the others. Although all aims are achieved in this study, but there are still some limitations in different perspectives of the study such as details of data, determining the criteria and weights, which can be overcome by utilizing a high spatial resolution RS/GIS data to improve the MCA studies.Item Application of ASTER data in the identification of alteration zones - related to mineralization around Wadi El Milk, North Kordofan, Sudan(جامعة النيلين, 2017) Randa G. M. Ali; Sami O. H. El Khidir; Mohammed Y. AbdelgalilAbstract: Hydrothermal alteration zones- related to mineralization can be identified and discriminated based on distinctive spectral properties that appears in ASTER satellite data. The image processing techniques are mostly used for medium to regional scale geological mapping. In this study, we aimed to conduct a more exploration studies by utilizing the ASTER data to enhance and delineate the hydrothermal alteration zones - related to mineralization in North Kordofan, Sudan. In this work, resampled and co-registered ASTER (VNIR- SWIR) data have been used. The obtained co- registered nine bands (VNIR-SWIR) were subjected to different methods of spectral indices and spectral analysis techniques such as Spectral Analysis Mapper. The spectral mineral indices (hematite, Alunite, Kaolinite and Muscovite Mineral Indices) results were found conformable with results of Spectral Angle Mapper Classifier (SAM) for the same minerals. However, SAM rule images and vector format yielded an overall good discrimination of the four minerals indicating the alteration zones- related to mineralization.