Beach Slope and Sediment-Grain-Size Trends as a Basis for Input Parameters for the SBEACH Erosion Model
Beach Slope and Sediment-Grain-Size Trends as a Basis for Input Parameters for the SBEACH Erosion Model
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海滩坡度和沉积物粒度趋势作为 SBEACH 侵蚀模型输入参数的基础
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发表时间：
2015
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通讯作者：
M. Leadon
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作者：
M. Leadon
摘要Leadon，M.，2015.作为SBEACH侵蚀模型输入参数基础的海滩坡度和沉积物粒度趋势。风暴诱发的BEACH CHange（SBEACH）模式校准研究的结果提供了新的技术和支持模式输入参数的选择和模式输出结果的解释。海滩和沙丘侵蚀分析使用SBEACH侵蚀模型在圣约翰县，佛罗里达，表现出敏感性的模拟侵蚀的两个模型输入参数的变化：沉积物粒度和雪崩前的最大坡度（MSPA）。MSPA参数对应于沙丘或海滩护堤侵蚀悬崖的向海坡度，位于风暴引起的侵蚀的向陆极限。模型标定工作表明，这两个模型输入参数和输沙率系数K的变化与海滩坡度的趋势。根据全县地形测量数据计算的海滩坡度值与现有的平均沉积物粒度数据的评价表明，这两个参数之间存在明显的相关性。该分析提供了一种方法，用于估计SBEACH模型输入整个圣约翰县所需的平均沉积物粒度值。在圣约翰县进行的SBEACH校准工作的结果表明，K和MSPA模型输入参数相对于平均沉积物粒度变化的趋势。在佛罗里达的巴拿马城海滩、佛罗里达的布里瓦德县以及沿着路易斯安那州海岸的巴拉塔里亚盆地内的堰洲岛进行的SBEACH模型校准研究的结果表明，这些趋势是一致的。
ABSTRACT Leadon, M., 2015. Beach slope and sediment-grain-size trends as a basis for input parameters for the SBEACH erosion model. Results from Storm-induced BEAch CHange (SBEACH) model calibration studies have provided new techniques and support for selection of model input parameters and interpretation of model output results. Beach and dune erosion analyses using the SBEACH erosion model in St. Johns County, Florida, demonstrated sensitivity of simulated erosion to changes of two model input parameters: sediment grain size and maximum slope prior to avalanching (MSPA). The MSPA parameter corresponds with the seaward slope of the dune or beach-berm erosion escarpment at the landward limit of the storm-induced erosion. Model calibration work demonstrated trends of these two model input parameters and of the sediment-transport rate coefficient K in relation to changes in beach slope. Evaluation of beach-slope values computed from county-wide topographic survey data in relation to the available mean sediment-grain-size data has shown clear correlation between these two parameters. This analysis provided a method for estimating mean sediment-grain-size values needed for SBEACH model input throughout St. Johns County. Results of SBEACH calibration work performed throughout St. Johns County demonstrated trends in the K and MSPA model input parameters relative to mean sediment-grain-size variations. Results of SBEACH model calibration studies in Panama City Beach, Florida; Brevard County, Florida; and on barrier islands within the Barataria Basin along the Louisiana coast demonstrated consistency with these identified trends.