Influence of Diverse Urban Pressures on Water Characteristics in a Small Eastern Mediterranean Watershed

IF 1.7 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Aquatic Geochemistry Pub Date : 2022-06-17 DOI:10.1007/s10498-022-09405-w

E. Maatouk, A. El Samrani, R. Sawan, R. Bou Ghosn Salameh, V. Kazpard, Z. Matar

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引用次数: 1

Abstract

This work focuses on the characterization of a typical coastal karst watershed by addressing its physico-chemical parameters. The concentrations of the main ions clearly indicate the dominance of Ca²⁺ and HCO₃⁻ with a carbonate weathering rate equivalent to 230t/Km²/year; that is a typical weathering of karst watersheds. The spatio-temporal variability of dissolved organic matter (DOM) is also assessed in the watershed. Many samples were collected under different hydrological conditions from three representative sites. The evolution of OM composition along an urbanization gradient from upstream to downstream Kadisha watershed reveals the very strong impact of urban discharges on the receiving waters. Substantial differences in DOC results are highlighted in relation to the urban or natural origin of the DOM. Upstream OM flux is quantified and compared to downstream OM flux showing that, during the low flow period, the downstream flux is 29 times higher than the upstream. Also, a large fraction of non-humic substances, including hydrophilic organic matter HPI, is detected in the downstream section impacted by urban discharges. The higher values of SUVA noticed for DOM at upstream compared to downstream, reflects the low aromaticity and non-humic character of DOM in downstream. These outcomes show the impact of the Tripoli urban discharges on the quality and quantity of OM in the receiving waters downstream of the Kadisha catchment. This is typical at low water period when the dilution factor of urban discharges in the receiving waters is the least.

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不同城市压力对东地中海小流域水特征的影响

这项工作的重点是通过解决其物理化学参数的典型沿海喀斯特流域的特征。主要离子浓度明显以Ca2+和HCO3−为主，碳酸盐风化速率约为230t/Km2/年;这是典型的喀斯特流域风化。并对流域溶解有机质(DOM)的时空变异性进行了评价。在三个有代表性的地点，在不同的水文条件下采集了许多样品。Kadisha流域OM组成沿城市化梯度从上游到下游的演变揭示了城市排放对接收水域的强烈影响。DOC结果的实质性差异在DOM的城市或自然起源方面得到了突出显示。对上游OM通量进行了量化，并与下游OM通量进行了比较，结果表明，在低流量期，下游通量比上游高29倍。此外，在受城市排放影响的下游区域，检测到大量非腐殖质物质，包括亲水有机质HPI。上游DOM的SUVA值高于下游，反映了下游DOM的低芳香性和非腐殖性。这些结果显示了的黎波里城市排放对卡迪沙集水区下游接收水域OM的质量和数量的影响。这是典型的低潮期，城市污水在接收水域的稀释系数最小。

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来源期刊

Aquatic Geochemistry 地学-地球化学与地球物理

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.