Erosion Behavior of Sand-silt Mixtures: the Role of Silt Content
Erosion Behavior of Sand-silt Mixtures: the Role of Silt Content
复制标题
砂泥混合物的侵蚀行为：泥沙含量的作用
DOI：
10.2112/si85-235.1
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发表时间：
2018-05
影响因子：
--
通讯作者：
Ou Suying
中科院分区：
文献类型：
--
作者：
Yao Peng;Hu Zhan;Su Min;Chen Yongping;Ou Suying
摘要：Hu，Z.;苏，M.; Chen，Y.P.，和欧世贤，2018.砂-粉砂混合物的侵蚀特性：粉砂含量的作用。In：Shim，J.S.;春，我。，和Lim，H. S.（编辑），2018年国际沿海研讨会（ICS）（韩国釜山）的会议记录。《海洋研究杂志》，特刊第85期，页。1171-1175.椰子溪（佛罗里达），ISSN 0749-0208。众所周知，临界粘粒含量是控制混合料整体粘聚力和提高侵蚀阈值的关键因素。除粘性粘粒外，已有的研究表明，非粘性粉土也能提高桑迪床的床面稳定性。许多研究进行了与人工双峰混合物具有不同的峰值的砂和粉砂部分，以了解粉砂颗粒的作用。然而，目前尚不清楚双峰混合物在多大程度上代表天然砂粉砂混合物。通过对典型粉砂型潮滩沉积物的环形水槽试验，研究了粉砂对砂粉混合物侵蚀行为的影响。使用了两种类型的砂-粉土混合物：中值粒径为52 μm的粉土混合物和中值粒径为82 μm的极细砂混合物。结果表明，粉砂含量为30%的混合物表现为砂，细砂的Shields曲线（货车Rijn，2007）适用于预测临界床面切应力。当含泥量增加到60%时，床面的临界切应力是含泥量为30%时床面切应力的2倍，床面稳定性增强。由于各混合料的粒径比（Dm，砂/Dm，粉砂）相同，粉砂含量被认为是提高运动阈值的重要因素。应进行更多的研究，以了解临界粉砂含量和潜在的机制。
ABSTRACT Yao, P.; Hu, Z.; Su, M.; Chen, Y.P., and Ou S.Y., 2018. Erosion behavior of sand-silt mixtures: the role of silt content. In: Shim, J.S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1171–1175. Coconut Creek (Florida), ISSN 0749-0208. It is well known that critical clay content is key factor controlling overall cohesion of the mixtures and increasing erosion threshold. Besides cohesive clay fraction, existing studies show that non-cohesive silt can enhance bed stability of a sandy bed as well. Many studies were conducted with an artificial bimodal mixture with distinct peaks of sand and silt fraction to understand the role of silt particles. However, it is unclear to what extent a bimodal mixture represents natural sand-silt mixtures. In this study, we conducted series of annular flume experiments on sediment samples collected from typical silt dominated tidal flat to study role of the silt on erosion behavior of sand-silt mixtures. Two types of sand-silt mixtures were used: a silt-sized mixture with median grain size of 52 μm, and a very fine sand-sized mixture with median grain size of 82 μm. The results show mixtures with 30% silt content behaves as sand, and a Shields curve of fine sands (van Rijn, 2007) is applicable for prediction of the critical bed shear stress. However, bed stability is enhanced when silt content increases to 60%, since the critical bed shear stress is twice of bed materials with 30% silt. Since the fractional grain size ratio (Dm,sand/Dm,silt) of each mixture is the same, silt content is considered as the important factor on increasing the threshold of motion. More studies should be conducted to understand the critical silt content and the underlying mechanisms.
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影响因子：
2.3
作者：
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通讯作者：
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DOI：
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发表时间：
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期刊：
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