Alfarrah Nawal, Berhane Gebremedhin, Hweesh Abdelrahim, Walraevens Kristine
Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, Krijgslaan 281-S8, 9000, Ghent, Belgium.
Geology Department, Az Zawiyah University, Az Zawiyah, Libya.
Ground Water. 2017 Jul;55(4):593-601. doi: 10.1111/gwat.12534. Epub 2017 May 12.
The desert of eastern Libya forms one of the most arid regions of the Sahara. The Great Man-Made River Project (GMRP) was established. It transports millions of cubic meters of water a day from desert wellfields to the coastal cities, where over 80% of the population lives. The Tazerbo Wellfield is one of the wellfields designed within the GMRP, delivering water to the eastern coast of Libya through an underground pipe network. Tazerbo Wellfield consists of 108 production wells; each well was designed to pump 100 L/s. The planned total groundwater withdrawal from all wells is 1 million m /d. The deep sandstone aquifer (Nubian sandstone) is covered by a thick mudstone-siltstone aquitard and is being heavily pumped. The aquifer and fine-grained sediments of the aquitard may be compacted resulting in land subsidence as a result of high exploitation. Local sinkholes have developed in the area of Tazerbo since the start of the pumping from the wellfield in 2004. These sinkholes have been caused mainly by lowering of the piezometric heads due to the withdrawal of groundwater. In this study, a hydrogeological investigation is presented about the effect of large groundwater pumping from the Nubian sandstone aquifer in Tazerbo Wellfield, SE Libya, based on physical parameters for 108 production wells and 23 observation wells.
利比亚东部的沙漠构成了撒哈拉沙漠最干旱的地区之一。大人工河项目（GMRP）应运而生。该项目每天将数百万立方米的水从沙漠井田输送到沿海城市，利比亚超过80%的人口居住在这些城市。塔泽尔博井田是大人工河项目中规划的井田之一，通过地下管网向利比亚东海岸供水。塔泽尔博井田由108口生产井组成；每口井的设计抽水量为100升/秒。所有井计划的总地下水开采量为100万立方米/天。深层砂岩含水层（努比亚砂岩）被一层厚厚的泥岩 - 粉砂岩隔水层覆盖，目前正被大量抽水。由于过度开采，含水层和隔水层的细粒沉积物可能会被压实，从而导致地面沉降。自2004年该井田开始抽水以来，塔泽尔博地区出现了局部塌陷坑。这些塌陷坑主要是由于抽取地下水导致测压水头下降造成的。在本研究中，基于108口生产井和23口观测井的物理参数，对利比亚东南部塔泽尔博井田努比亚砂岩含水层大量抽水的影响进行了水文地质调查。
