Basin Groundwater Recharge and Discharge in the Gully Erosion Prone Areas of Anambra, Nigeria
Basin Groundwater Recharge and Discharge in the Gully Erosion Prone Areas of Anambra, Nigeria作者机构：Environmental Geochemistry Division National Geophysical Research Institute Hyderabad 500007 India Department of Geological Sciences Faculty of Natural Sciences Nnamdi Azikiwe University Awka 420281 Nigeria Geology Department Faculty of Natural Sciences Anambra State University Uli 431124 Nigeria Works Department Federal Polytechnic Oko 423117 Nigeria
出 版 物：《Journal of Environmental Science and Engineering》 (环境科学与工程（英文版）)
年 卷 期：2011年第5卷第7期
页 面：925-930页
学科分类：082802[工学-农业水土工程] 081803[工学-地质工程] 08[工学] 0828[工学-农业工程] 0818[工学-地质资源与地质工程] 09[农学] 0815[工学-水利工程] 0903[农学-农业资源与环境]
主 题：Groundwater recharge/discharge drainage basin gully erosion landslides.
摘 要：Anambra State of Nigeria is ravaged by ecological hazards of gully erosion and landslides. Over 450 active gully and landslide sites with depths ranging from 5 m to over 120 m are concentrated on both sides of the Awka-Nanka-Umuchu-Orlu cuesta. The Idemili River and Odo River form the major drainage basins of the area. The geomorphic characteristic of the cuesta/escarpment is a major controlling factor in groundwater recharge and discharge within the drainage basins. Rise in aquifer levels result in hydrogeotechnical implications of gully development and landslides. The calculated values of hydraulic properties of conductivity and transmissivity range from 1.20×10^-1 to 5.93×10^-1 cm/s and 1.15×10^5-13.05×10.3 m^2/s respectively. The values of groundwater velocity and groundwater discharge were 82 *** and 2.96×10^6 m^*** The plasticity index of the soil in the gully prone areas is relatively low ranging from 12.50-36.57%. The unique features of the geologic formations together with obtained aquifer characteristics favour gully/landslide hazards in the area.
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