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Onshore barrier affects sediment deposition in a subtropical mudflat
Regional Studies in Marine Science ( IF 2.1 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.rsma.2020.101344
Sayedur Rahman Chowdhury , Avijit Talukder , S.M. Sharifuzzaman , M. Shahadat Hossain

Onshore barrier in the intertidal area is reported to influence coastal geomorphology, sediment dynamics, and erosion and accretion processes. The present study describes sediment texture and deposition pattern, and shore profile of a tidal mudflat located in the Kutubdia Island of Bangladesh. A physical barrier in the form of concrete ring structure was placed on the mudflat of experimental site and the control site was 50 m away without any barrier. The texture of sediment was mostly medium silt (45.3%) in leeward side (= the side facing away from the tide/wave action) of the barrier. Whereas, coarse silt was dominant in the control (35.2%) and seaward side (31.2%), followed by medium silt (25.1% and 29.0%, respectively). The proportion of fine sand was higher in the control (18.4%) and seaward side (16.1%) than that of the leeward side (6.1%). Because of the barrier, there was noticeable sedimentation on mudflat as demonstrated by increased elevation of shore profile in the leeward side, 23.3 cm vs. 3.6 cm in the control. Sediment deposition was, however, varied due to susceptibility to erosion depending on grain size distribution, e.g. the fine deposits had greater erodibility than the sandy deposits. These results suggest that barrier on mudflat could bring a positive change to the sediment profiling and shore morphology, and thus help stabilizing the eroding shoreline.



中文翻译:

陆上屏障影响亚热带泥滩的沉积物沉积

据报道,潮间带的陆上屏障会影响沿海地貌,沉积物动力学以及侵蚀和吸积过程。本研究描述了位于孟加拉国库图布迪岛的潮汐滩涂的沉积物质地和沉积模式以及海岸剖面。将混凝土环结构形式的物理屏障放置在实验场地的泥滩上,控制场地距离50 m,没有任何屏障。屏障的背风面(背离潮汐/波浪作用的一面)的沉积物质地大多为中等淤泥(45.3%)。对照中粗粉砂占主导地位(35.2%),向海一侧(31.2%)占主导地位,其次是中等粉砂(分别为25.1%和29.0%)。细砂的比例在对照组(18.4%)和向海侧(16.1%)高于背风侧(6.1%)。由于有障碍物,在泥滩上有明显的沉积,如背风侧的岸线剖面升高(从对照的23.3 cm到3.6 cm)所示。然而,沉积物的变化是由于易受侵蚀的影响而变化的,具体取决于粒度分布,例如,细颗粒沉积物比沙质沉积物具有更大的侵蚀性。这些结果表明,滩涂屏障可以对沉积物剖面和海岸形态带来积极的变化,从而有助于稳定侵蚀的海岸线。细粒沉积物比沙质沉积物具有更大的侵蚀性。这些结果表明,滩涂屏障可以对沉积物剖面和海岸形态带来积极的变化,从而有助于稳定侵蚀的海岸线。细粒沉积物比沙质沉积物具有更大的侵蚀性。这些结果表明,滩涂屏障可以对沉积物剖面和海岸形态带来积极的变化,从而有助于稳定侵蚀的海岸线。

更新日期:2020-06-26
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