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首页> 外文会议>International Union of Geodesy and Geophysics General Assembly >The sedimentological changes caused by human impact at the artificial channel of Medjerda-River (Coastal zone of Medjerda, Tunisia)
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The sedimentological changes caused by human impact at the artificial channel of Medjerda-River (Coastal zone of Medjerda, Tunisia)

机译：Medjerda-River（Medjerda，突尼斯沿海地区）人工渠道引起的沉积学变化

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Recent sedimentary and morphological changes at the new mouth of Medjerda-River (Gulf of Tunis) are investigated using a multiproxy approach of sediment cores complited by ~(210)Pbex and ~(137)Cs method dating. The subject of the study is to focus on surveying the sedimentary evolution of Medjerda-Raoued Delta caused by the human intervention in the management of the main tributaries of the Medjerda-River (artificial channel of Henchir Tobias). Sediment cores (CEM-1 and CEM-3) were subjected to both multiproxy approaches (Grain size, geochemical analysis and dating radiometric ~(210)Pbex and ~(137)Cs). The sedimentological analysis of the new deltaic deposits shows a progradation sequence with the silt and clay deposits on the historic sandy substratum. The mean grain size evolution on the old beach profile shows a decreasing trend from backshore (CEM-3) to nearshore (CEM-1). The geochemical results show varying concentrations of chemical elements such as Fe, K, Rb, Nb, Cr, Ti, Ba, Ca, Sr, Zr, V, and potentially toxic metal trace elements such as Pb, Zn and the As. The Principal component Analysis (PCA) applied in the geochemical elements evolution confirms the marine origin of the sand deposits in the basic layers of the two cores. The chronological method (~(210)Pbex and ~(137)Cs) affirms that the first fluvial deposits were set up only after 1950. The sedimentological and geochemical result confirm the actual unless of coarser fluvial supplies under the human activities leading the negative coastal sediment balance and the shoreline retreat as well.
机译：利用〜（210）PBEX致〜（137）CS方法约会，使用沉积物核心的多分歧方法来研究新的Medjerda-River（突尼斯湾）的沉积和形态变化。该研究的主题是专注于调查由人类干预造成的Medjerda-Raou三角洲的沉积演变，以人为干预Medjerda-River的主要支流（Henchir Tobias的人为渠道）。对沉积物核（CEM-1和CEM-3）进行多分杂方法（晶粒尺寸，地球化学分析和约会辐射率〜（210）PBEX和〜（137）CS）。新的Deltaic沉积物的沉积学分析显示了历史型沙子上淤泥和粘土沉积物的促成序列。旧海滩型材的平均晶粒大小演变显示了从岸上（CEM-3）到近岸（CEM-1）的减少趋势。地球化学结果显示了不同浓度的化学元素，例如Fe，K，Rb，Nb，Cr，Ti，Ba，Ca，Sr，Zr，V和潜在有毒金属微量痕量元素，例如Pb，Zn和As。在地球化学元件演变中应用的主要成分分析（PCA）确认了两座核心基层中的砂沉积物的海洋起源。时间顺序方法（〜（210）PBEX和〜（137）CS）确认了第一个河流存款仅在1950年之后建立。沉积学和地球化学结果证实了实际的实际，除非在引领负沿海的人类活动下造熟河流供应沉积平衡和海岸线撤退也是如此。

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