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首页> 外文会议>International Symposium on Advances in Isotope Hydrology and its Role in Sustainable Water Resources Management;IHS-2007 >APPLICATION OF 15N ISOTOPES TO MANAGEMENTOF GROUNDWATER QUALITY, JABAL HASOUNAWELLFIELDS, GREAT MAN-MADE RIVERPROJECT, LIBYAN ARAB JAMAHIRIYA
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APPLICATION OF 15N ISOTOPES TO MANAGEMENTOF GROUNDWATER QUALITY, JABAL HASOUNAWELLFIELDS, GREAT MAN-MADE RIVERPROJECT, LIBYAN ARAB JAMAHIRIYA

机译：15N同位素在地下水质量管理中的应用，贾巴尔·哈索纳韦尔菲尔德斯，大人造河项目，利比亚·阿拉伯阿拉伯联合酋长国

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The Jabal Hasouna wellfi elds are located some 700 kilometres south of Tripoli, thecapital of Libya, and are part of the Great Man-Made River Project for water supply tocoastal areas. The wellfi elds include 484 deep wells with a total design production rateof 2.5 million cubic metres per day from the Cambro-Ordovician sandstone aquifer. Theaquifer is unconfi ned in the southwestern portion of the wellfi elds and the remainderis confi ned, but most of the wells are located in the unconfi ned part. Water quality isgood, but concentrations of nitrate up to 133 mg/L occur in the wellfi elds, with slightlyhigher concentrations in the unconfi ned aquifer. Previous 14C dating of the groundwatergave ages of 10.4 ka ± 0.4 ka to 17.2 ka ± 0.1 ka BP and stable isotope data indicate ameteoric origin from recharge during a humid climate phase of the Sahara. Analysis ofδ15N and δ18O from groundwater nitrate showed a range of 7.11 to 12.64‰ for the δ15Nand 12.51 to 22.35‰ for the δ18O. At Jabal Hasouna these ranges suggest that soil nitratemay be the source. There appears to be a low rate of denitrifi cation so high nitrate levelswill be a long-term concern for water quality.
机译：Jabal Hasouna Wellfi Elds酒店位于Tridoli以南约700公里 利比亚的首都，是供水的伟大人造河项目的一部分 沿海地区。 Wellfi ELD包括484个深井，具有全面的设计生产率 来自Cambro-Ordovician砂岩含水层每天250万立方米。这 含水层是在Wellfi Elds和剩下的中西南部的undfi ned 是confi ned，但大多数井都位于Unconfi ned部分。水质是 良好，但硝酸盐浓度高达133毫克/升，略微发生在井里的eld Unconfi Ned Aquifer中的浓度较高。以前的14C地下水约会 给出10.4 ka±0.4 ka至17.2ka±0.1ka bp和稳定同位素数据表示a 在撒哈拉州潮湿的气候期间充电中的陨石起源。分析 来自地下水硝酸盐的Δ15n和δ18o显示δ15n的范围为7.11至12.64 Δ18O为12.51至22.35‰。在Jabal Hasouna这些范围表明土壤硝酸盐 可能是源头。似乎是Denitrifi阳离子的低速率，因此硝酸盐水平高 将是水质的长期关注。

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