Estimating Landward Migration of Nearshore Constructed Sand Mounds
Estimating Landward Migration of Nearshore Constructed Sand Mounds
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DOI：
10.1061/(asce)0733-950x(1995)121:5(247
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发表时间：
1995-09
期刊：
影响因子：
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通讯作者：
S. Douglass
中科院分区：
文献类型：
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作者：
S. Douglass
建立了一个在日常冲浪区近海建造、但在风暴期间受到海浪干扰的深处的潜丘迁移模型。该模型基于Bagnold的推移质输沙方程和Stokes的二阶波动理论，考虑了有限振幅波的速度不对称性引起的净输沙问题。沙子守恒的考虑导致了一个方程，它表明土丘将按照非线性对流-扩散模型运行。仅基于波浪和输沙模型的“对流系数”类参数被用来估计淹没土丘的迁移率。不同深度下土丘移动的期望值可以利用特定地点的波浪气候数据来估计。完整的泥沙输运方程成功地模拟了1989年加利福尼亚州银滩州立公园的一个土丘的迁移。土丘移动参数的期望值给出的结果与在阿拉巴马州莫比尔的Silver Strand和近海测得的迁移率相当吻合。
A model for the migration of submerged mounds constructed offshore of the day-to-day surf zone but within the depths disturbed by waves during storm events is developed. The model considers net shoreward sand transport due to the velocity asymmetry of finite-amplitude waves, and is based on Bagnold’s bed-load–sand transport equation with Stokes’ second order wave theory. Conservation of sand considerations lead to an equation that indicates mounds will behave according to a nonlinear convection-diffusion model. The “convection coefficient”–like parameter, which is based on the wave and sand-transport models only, is proposed as an estimate of the migration rate for submerged mounds. The expected value of mound movement in different depths can be estimated with site-specific wave-climate data. The full sediment-transport equations successfully simulate the migration of a mound at Silver Strand State Park, California, in 1989. The expected value of the mound-movement parameter gives results that agree reasonable well with measured migration rates both at Silver Strand and offshore of Mobile, Alabama.