利比亚东北部班加西平原 Al-Coeffiah 地区岩溶石灰岩地质灾害评估

IF 1.1 4区 地球科学 Q3 GEOLOGY
Entisar El-Rayani, Fathi Salloum, Abdelsalam Elshaafi, Awad Bilal, Khalifa Eldursi
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引用次数: 0

摘要

Al-Coeffiah 岩溶地貌位于利比亚东北部的班加西平原,是 Al-Jabal Al-Akhdar 反岩层的一部分。该地区出露的地层序列主要以班加西地层的中新世石灰岩为代表。该地区有丰富的岩溶地貌,如洞穴和巨大的溶洞,地下有许多空隙和绵延数公里的运河网络。这项研究以实地观察为基础,结合对 Al-Coeffiah 喀斯特地形高分辨率卫星图像的分析。主要目的是评估岩溶地貌可能造成的地质灾害,包括 (i) 岩石崩塌、(ii) 地下水污染和 (iii) 地球化学过程。研究发现,潜在的地质灾害主要存在于浅层的大型洞穴中,如 Al-Jebah、Habibi、Merisi 和 Boukarmah doline 洞穴。此外,软沉积物中的溶洞所形成的断裂岩溶地貌的地质灾害更大。化学和细菌分析表明,Al-Coeffiah 地区及其周边地区的地下水污染被认为是最严重的 问题之一,这主要是由于污水通过岩溶现象渗入造成的,尤其是在过去 10 年里。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Assessment of geohazards of karstified limestone in Al-Coeffiah area, Benghazi plain, NE Libya

Assessment of geohazards of karstified limestone in Al-Coeffiah area, Benghazi plain, NE Libya

Al-Coeffiah karst terrain is located in Benghazi plain which is a part of Al-Jabal Al-Akhdar anticlinorium, northeast Libya. The exposed stratigraphic sequence of the area is largely represented by the Middle Miocene limestone rocks of Benghazi Formation. The area is affected by abundant karstic features such as caves and giant dolines with many subsurface voids and canal networks which extends for several kilometers. This research is based on field observations combined with analysis of high-resolution satellite imagery of Al-Coeffiah karst terrain. The main aim is to assess potential geohazards provided by the karst features, including (i) rock failure, (ii) groundwater pollution, and (iii) geochemical processes. The potential geohazards have been found to lies in the large caves at shallow depths such as Al-Jebah, Habibi, Merisi, and Boukarmah doline-caves. In addition, there is a greater geohazard in fractured karst terrains which are created by dolines in soft sediments. Chemical and bacteriological analyses indicate that the groundwater pollution in Al-Coeffiah area and its surrounding regions is considered as one of the most serious problems largely due to the seepage of sewage water through karst phenomena particularly during the last 10 years.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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