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Use of Landsat 8 OLI Images to Assess Groundwater Potential Areas in the Bamun Plateau: Cameroon Volcanic Line (CVL)

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Journal of Water Resource and Protection 2020年第7期12卷 558-576页

作者： Oumar Farouk Mouncherou olivier njikeu Brice Tchakam Kamtchueng Amidou Kpoumié Zakari Mfonka Oumarou Farikou Mfochive Yvette Frida Danwe Mohammad Bello Amidou Moundi Jules Remy Ndam Ngoupayou Jean Claude Tonga Institute of Mining and Geological Research (IRGM) Yaounde Cameroon Department of Earth Sciences University of Yaounde I Yaounde Cameroon Department of Earth Sciences University of Maroua Maroua Cameroon Spatiale Studies Center of the Biospher UMR 5126 CNRS-CNES-IRD-UPS IUT Paul Sabatier Toulouse France

The problem of groundwater supply in the Bamun plateau situated in the Cameroon Volcanic Line exists and no proper solution has been found so far. This investigation intends to find the suitable groundwater potential zones by overlaying the geomorphologic map, lineament map, lineament density map and lithological map, using visual interpretation of Landsat imagery. The results reveal that about 1921 structural elements, ranging in size, from 30 m to 5.845 km with an average length of 671 m in the field. The total length of the mapped lineaments is approximately 1289 km. The most important lineament (5.845 km length) diagonally crosses the study area in the direction NNE-SSW. In addition to this trend, all others are smaller than 14 km. More than 92% of lineaments are less than 5 km in size and only 1.3% of them are larger than 10 km. Small lineaments are thus the most numerous. According to their directions, the lineaments listed are grouped into 18 directional classes of 10-degree intervals. The rosette of their directions highlights the preferred directions NE-SW, N-S, E-W, NNE-SSW and ENE-WSW. Most of the lineaments clusters in the central part of the area are N20° - 30°E and N60° - 70°E trending lineaments. In this study, the NE-SW trend dominates the structural trend followed by NW-SE and N-S. This can be an indication of the directions of groundwater movement in the area. Alluvial plain and valley have moderate to very good groundwater potential that occurs all over the study area. Porosity of the volcanic rocks varies greatly, but it is everywhere more porous than the underlying, unweathered bedrock. There are essentially three classes (low, average and high) of groundwater potential zones. Hight potential zones are observed around the localities of the Khogham, Mbatpit and Mbam massifs on the one

关键词： Bamun Plateau Aquifer Lineaments Landsat Imageries Groundwater

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