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Reducing aeolian sand transport and beach erosion by using armour layer of coarse materials
Coastal Engineering ( IF 4.4 ) Pub Date : 2021-03-04 , DOI: 10.1016/j.coastaleng.2021.103871
G. Strypsteen , L.C. van Rijn , M.D. Hoogland , P. Rauwoens , J. Fordeyn , M.P. Hijma , Q.J. Lodder

A man-made dune-beach-spit system at the south-east side of the island of Texel (Prins Hendrik site) has been built in 2018–2019 to strengthen the traditional dike. The core of the dune-beach-spit system consists of medium fine sand with a d50 of 0.25–0.3 mm. The beach is covered with an armour (protection) layer of coarse materials with relatively large gravel and shell fractions to reduce wind erosion and thus maintenance costs. In the design phase of the project the aeolian sand transport model of Bagnold was used to estimate the long-term erosion losses of sand at the new dune-beach system. This transport model was validated in the design phase by using detailed sand transport and bed roughness measurements at a nearby site called The Hors. This site is a wide natural beach plain of sand (d50 = 0.23 mm), where 147 high-quality datasets have been collected using a wind mast equipped with 5 cup anemometers and various sand traps. It is shown that the measured sand transport rates at the Hors can be reasonably well represented by the modified Bagnold-equation for dry sand. After completion of the new dune-beach system, a field experiment was performed at the Prins Hendrik site to verify the sediment transport predictions and erosion loss of sand. Data from two permanent wind masts and one short, mobile wind mast were used to derive the effective roughness of (stationary) bed forms. Sand transport rates were measured at various locations using a new trap sampler. The measured sediment transport in the armoured beach zone can be reasonably well represented by the Bagnold-equation using a multi-fraction approach with hiding-exposure coefficient. The predicted transport rates have been used to estimate the annual loss of sand from the Prins-Hendrik site.



中文翻译:

通过使用粗糙材料的装甲层减少风沙输送和海滩侵蚀

2018-2019年,在特塞尔岛东南侧(Prins Hendrik工地)建立了人造沙丘-沙滩-吐痰系统,以加强传统堤防。沙丘-海滩-吐水系统的核心由中等细砂组成,ad 50为0.25-0.3 mm。海滩上覆盖着一层具有相对较大的砾石和贝壳部分的粗糙材料装甲(保护)层,以减少风蚀,从而降低维护成本。在项目的设计阶段,使用Bagnold的风沙运输模型估算了新的沙丘-海滩系统的长期砂土侵蚀损失。在设计阶段,通过在附近称为The Hors的地点使用详细的砂土运输和床面粗糙度测量,对这种运输模型进行了验证。这个地点是一片宽阔的天然沙滩,沙地(d 50 = 0.23毫米),其中使用配备有5个杯型风速计和各种集沙器的风杆收集了147个高质量数据集。结果表明,用改良的巴格诺德方程式对干砂的测量可以很好地表示在Hors处测得的砂传输速率。新的沙丘-海滩系统完成后,在普林斯·亨德里克(Prins Hendrik)场地进行了野外试验,以验证沉积物迁移预测和砂土侵蚀损失。来自两个永久性风杆和一个短而移动的风杆的数据被用来得出(固定)床身形式的有效粗糙度。使用新的捕集阱采样器在各个位置测量了沙的运输速度。装甲海滩区中测得的泥沙运移可以通过使用具有隐藏-暴露系数的多分数方法的Bagnold方程来很好地表示。预测的运输速度已用于估计Prins-Hendrik站点每年的沙子损失。

更新日期:2021-04-09
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