Sbeach, Numerical Model for Simulating Storm-Induced Beach Change: Report 1: Empirical Foundation and Model Development
Sbeach, Numerical Model for Simulating Storm-Induced Beach Change: Report 1: Empirical Foundation and Model Development
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发表时间：
2019-02
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通讯作者：
M. Larson;N. Kraus
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作者：
M. Larson;N. Kraus
翻译后摘要：一个二维的数值模型，计算沙丘和海滩侵蚀产生的风暴潮和水位。基于经验的模型首先从大型波浪水槽中观察到的净跨岸输沙率和地貌变化的大数据集开发，然后使用高质量的现场数据进行验证。目的是再现海滩剖面的宏观特征，重点是沿岸砂坝的形成和运动。最终目标是预测风暴引起的海滩侵蚀和风暴后恢复。酒吧的模拟令人满意，但护堤过程不太好再现，部分原因是缺乏数据定义增生波和剖面过程。一个新的标准是开发预测侵蚀和加积，和模型使用此标准计算净输沙率在四个地区的近岸延伸从深水到极限的波浪爬高。通过计算剖面上的波高和立波，得到净跨岸输沙率。该模型以工程资料为驱动，主要输入为深水波高和周期时间序列、水位时间序列、中位海滩粒径和初始剖面形状。进行了全面的敏感性测试，并提出了示例应用程序，以评估响应的配置文件的存在下，一个垂直的海堤和行为的不同海滩填充横截面的正常和风暴波行动的调整。关键词：加积;跨海岸输沙;沙丘侵蚀;长海岸沙坝。
Abstract : A two-dimensional numerical model is presented for calculating dune and beach erosion produced by storm waves and water levels. The empirically based model was first developed from a large data set of net cross-shore sand transport rates and geomorphic change observed in large wave tanks, then verified using high-quality field data. The aim is to reproduce macroscale features of the beach profile, with focus on the formation and movement of longshore bars. The ultimate goal is prediction of storm-induced beach erosion and post-storm recovery. Bars are simulated satisfactorily, but berm processes are less well reproduced, due in part to a lack of data for defining accretionary wave and profile processes. A new criterion is developed for predicting erosion and accretion, and the model uses this criterion to calculate net sand transport rates in four regions of the nearshore extending from deep water to the limit of wave runup. Wave height and setup across the profile are calculated to obtain the net cross-shore sand transport rate. The model is driven by engineering data, with main inputs of time series of wave height and period in deep water, time series of water level, median beach grain size, and initial profile shape. Comprehensive sensitivity testing is performed, and example applications are made to evaluate the response of the profile to the presence of a vertical seawall and behavior of different beach fill cross sections in adjustment to normal and storm wave action. Keywords: Accretion; Cross shore sand transport; Dune erosion; Longshore bars.