Equilibrium scour depths around piles in noncohesive sediments under currents and waves
Equilibrium scour depths around piles in noncohesive sediments under currents and waves
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DOI：
10.1016/j.coastaleng.2011.05.011
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
U. Zanke;T. Hsu;A. Roland;Ó. Link;R. Diab
中科院分区：
文献类型：
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作者：
U. Zanke;T. Hsu;A. Roland;Ó. Link;R. Diab
本文提出了在恒定流、潮汐和短波作用下单桩平衡冲刷深度的通用计算公式。根据量纲分析，发现冲刷的控制参数是Keulegan-Carpenter数和流速与泥沙颗粒开始运动的临界速度之间的比值u/uc。在此基础上，本文推导了一个新的平衡冲刷深度计算公式。文中采用文献中的冲刷过程和波流作用的实测资料，KC和u/u分别在6 ~ 105和0.6 ~ 4.5之间，对新提出的公式进行了参数化和验证。预测的冲刷深度和调查的测量结果清楚地表明，在文献中还没有报道的床特性的影响。预测使用新的方法进行了比较，与以前的测量和其他配方中提出的专门文献。该经验公式较好地反映了波浪、水流和泥沙特性对冲刷过程的影响。
A universal formula for the estimation of equilibrium scour depth around a single cylindrical pile under the action of steady currents, tidal and short waves is presented. Following a dimensional analysis, the controlling parameters of scour was found to be the Keulegan–Carpenter number and the ratio between the flow velocity and the critical velocity for the initiation of motion of the sediment particles, u/uc. Based on this finding a new formula for the prediction of equilibrium scouring depths was derived in this paper. Measurements of the scouring process and the action of waves and/or currents from literature are used with KC and u/ucranging between 6 and 105, and 0.6 and 4.5, respectively for the parameterization and verification of the newly proposed formula. The predicted scour depths and the investigated measurements show clearly the influence of the bed properties which have not been reported before in the literature. Predictions using the new approach have been compared with previous measurements and other formulations presented in the specialized literature. The proposed empirical formula accounts for the effect of waves, currents and sediment characteristics on the scouring process and shows better results than previous ones.