Empirical parameterization of setup, swash, and runup
Empirical parameterization of setup, swash, and runup
复制标题
DOI：
10.1016/j.coastaleng.2005.12.005
复制
发表时间：
2006-05-01
影响因子：
4.4
通讯作者：
Sallenger, Asbury H., Jr.
中科院分区：
文献类型：
--
作者：
Stockdon, Hilary F.;Holman, Rob A.;Sallenger, Asbury H., Jr.
利用10个动态不同的现场试验所收集的海岸线水位时间序列，开发了一种用于在各种条件下在天然海滩上使用的极端抬高的经验参数，该参数由2%的Exeexence值定义。作为离散水位极大值的高度，爬升取决于两个动态不同的过程：时间平均的波浪建立和总的波浪漂移，每个过程都被单独参数化。海岸线的设置最好是使用更常见的基于Iribarren的设置表达式的维度形式进行参数化，该表达式包括前滨海滩坡度、离岸波高和深水波长。显著的冲击波可以分解为入射频段和亚重力频段。使用基于Iribarren的表达式的维度形式也可以最好地对事件SWASH进行参数化。利用离岸波高和波长在维度上对亚重力冲击进行建模是最好的，并且在统计上没有显示出对前滨或海浪带坡度的显著线性依赖。在以超重力为主的耗散海滩上，同时对入射和超重力频率分量进行建模的SETUP和SWASH的大小仅取决于离岸波的高度和波长。对所有站点平均预测拉升的统计数据表明，偏差为-17厘米，RMS误差为38厘米：所有实验的平均观测拉升高度为144厘米。在具有复杂前滨地形的中等和反射海滩上，在实际应用中使用近岸平均海滩坡度进行跳跃参数化可能会导致相对跳跃误差相当于实测值和平均斜率之间分数变异性的51%。爱思唯尔出版公司(Elsevier B.V.)
Using shoreline water-level time series collected during 10 dynamically diverse field experiments, an empirical parameterization for extreme runup, defined by the 2% exceedence value, has been developed for use on natural beaches over a wide range of conditions. Runup, the height of discrete water-level maxima, depends on two dynamically different processes; time-averaged wave setup and total swash excursion, each of which is parameterized separately. Setup at the shoreline was best parameterized using a dimensional form of the more common Iribarren-based setup expression that includes foreshore beach slope, offshore wave height, and deep-water wavelength. Significant swash can be decomposed into the incident and infragravity frequency bands. Incident swash is also best parameterized using a dimensional form of the Iribarren-based expression. Infragravity swash is best modeled dimensionally using offshore wave height and wavelength and shows no statistically significant linear dependence on either foreshore or surf-zone slope. On infragravity-dominated dissipative beaches, the magnitudes of both setup and swash, modeling both incident and infragravity frequency components together, are dependent only on offshore wave height and wavelength. Statistics of predicted runup averaged over all sites indicate a - 17 cm bias and an rms error of 38 cm: the mean observed runup elevation for all experiments was 144 cm. On intermediate and reflective beaches with complex foreshore topography, the use of an alongshore-averaged beach slope in practical applications of the runup parameterization may result in a relative runup error equal to 51% of the fractional variability between the measured and the averaged slope. Published by Elsevier B.V.