20世纪Medjerda三角洲的退化与发展(西地中海突尼斯)

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Thouraya Ben Moussa , Oula Amrouni , Abderraouf Hzami , Laurent Dezileau , Gil Mahé , Saâdi Abdeljaouad
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引用次数: 15

摘要

本研究的目的是重建梅杰达河三角洲最近的形态-沉积演化。利用卫星图像、沉积学和地球化学分析以及210Pbex和137Cs辐射测量数据,研究了1936 - 2016年Medjerda海岸线的时空演变。1936—2016年,岸线演变的总体趋势为进积增加(300±12 m)。然而,中尺度净岸线移动位置(NSM)和终点速率(EPR)显示,在1988-1999年期间,侵蚀模式估计为- 20 m±0.15 m/年。沉积学分析揭示了四个主要的岩石地层单元。细砂底层(Md = 0.08 mm)向粘土和粉砂相方向递减(Md <0.063毫米),富含大陆植物碎屑。地球化学结果显示陆源成分逐渐进入,而不是海相沉积。137Cs/210Pbex放射性测年证实了新河流在20世纪50年代的功能,最高沉积速率为3.3 cm/年。结果表明,1981年Sidi-Salem大坝蓄水后,泥沙流量急剧减少,沙粒大小减小,几乎没有沙粒到达海岸,海岸线退缩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Progradation and retrogradation of the Medjerda delta during the 20th century (Tunisia, western Mediterranean)

The aim of this study is the reconstitution of the recent morpho-sedimentary evolution of the Medjerda River delta. We examine the spatio-temporal evolution of the Medjerda shoreline between 1936 and 2016 using satellite images, complemented by sedimentological and geochemical analyses and 210Pbex and 137Cs radiometric data. The general tendency of the shoreline evolution shows an increasing progradation (300 ± 12 m) between 1936 and 2016. Yet the mesoscale Net Shoreline Movement position (NSM) and the End Point Rate (EPR) reveal an erosion pattern estimated to be −20 m ± 0.15 m/yr during the period 1988–1999.

The sedimentological analyses reveal four main lithostratigraphic units. The fine sand substratum layer (Md = 0.08 mm) decreases toward clay and silt facies (Md < 0.063 mm), rich in continental plant debris. The geochemical results reveal gradual incoming of the terrigenous component instead of marine deposits. The 137Cs/210Pbex radiometric dating confirms the functioning of the new river flow by the 1950s with the highest sedimentation rate being 3.3 cm/yr. Our results show that the Sidi-Salem dam impoundment (1981) led to a dramatic reduction of sediment discharge, a decrease of the grain size with nearly no more sand reaching the coast, and the shoreline retreat.

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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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