Alaskan Beaufort Shelf Evolution Model Setup and Output Data Files

Data available for download at https://arcticdata.io/data/10.18739/A2H70820F/ Supplementary material for Malito et al., 2022, Evolution of Arctic continental shelves: modelling morphologic feedbacks to climate driven increases in sea states, Journal of Geophysical Research: Oceans The data include model setup files (Delft3D-FLOW) and output results supporting research on the evolution of the Arctic continental shelves. In this study we used the Alaskan Beaufort Shelf as an analog for Arctic shelves undergoing climate-driven changes to sediment transport dynamics. Model trials were conducted using Delft3D-FLOW and processed using Matlab. Arctic continental shelves, including the Alaskan Beaufort Shelf (ABS), are experiencing declines in sea ice coverage and duration which are leading to increasingly energetic sea states and coastal erosion. A Delft3D sediment transport model was developed to test how present-day and projected future waves impact shelf evolution, and how shelf geometry modifies propagation of waves toward the coast. Wave-induced sediment transport and morphologic adjustment were enhanced on a relatively steep ABS shelf section (slope 0.0008) under increased projected waves. Redistribution of sediments from the inner shelf to the middle shelf led to attenuation of projected waves as the shelf evolved, creating a regulatory feedback loop. In contrast, effective wave attenuation across a relatively flat shelf section (slope 0.0003) limited cross-shelf transport and morphologic change. Our findings suggest that morphodynamic feedbacks to the growing Arctic wave climate depend on shelf geometry and can impact future coastal erosion. Experimental setup includes 1000-year morphodynamic evolution simulations conducted of two representative cross-shelf sections (located near Harrison Bay, AK, and Flaxman Island, AK) under two wave climates each ("Present-Day" waves and "RCP8.5" waves). Wave climates were extracted from a publicly available datasets (Casas-Prat et al., 2018). Annual time series were constructed for the Alaskan Beaufort shelf over a hindcast period from 1979-2005 and RCP8.5 projected period between 2081 and 2100 (Casas-Prat et al., 2018). The 1979-2005 wave hindcast is hereafter referred to as present-day waves, and the projected 2081-2100 dataset is referred to as RCP8.5 waves. A representative Beaufort Sea storm was then applied to the four output shelf profiles to evaluate the impact of shelf geometry on wave attenuation. Contents include: 1) Delft3D-FLOW model setup files for 1000-year model simulations a) Harrison Bay, AK i) Present-day waves ii) RCP8.5 waves b) Flaxman Island, AK 2) Delft3D-FLOW model setup files for representative storm trials 3) Processed Matlab structures and metadata for model results (1 and 2) Present-Day and RCP8.5 wave datasets were extracted from the Arctic wave climate projections conducted here: Casas-Prat, M., Wang, X. L., and Swart, N. (2018). CMIP5-based global wave climate projections including the entire Arctic Ocean. Ocean Modelling, 123(April 2017), 66–85. https://doi.org/10.1016/j.ocemod.2017.12.003可在 https://arcticdata.io/data/10.18739/A2H70820F/ 下载本数据集，本材料为Malito等人2022年发表于《地球物理研究杂志：海洋》的论文《北极陆架演化：气候驱动海况增强的地貌反馈模拟》的补充材料。 本数据集包含支撑北极陆架演化研究的Delft3D-FLOW模型配置文件与模拟输出结果。本研究以阿拉斯加波弗特陆架（Alaskan Beaufort Shelf, ABS）作为受气候驱动的沉积物输运动态变化北极陆架的类比研究对象。模拟试验通过Delft3D-FLOW完成，并使用Matlab进行后处理。 包括阿拉斯加波弗特陆架在内的北极陆架正经历海冰覆盖范围与存续时长的缩减，这导致海洋浪况愈发剧烈，海岸侵蚀加剧。本研究开发了Delft3D沉积物输运模型，用以检验当前及未来预估的波浪如何影响陆架演化，以及陆架几何形态如何调控波浪向岸传播。在坡度为0.0008的较陡ABS陆架区段，增强的未来预估波浪条件下，波浪诱导的沉积物输运与地貌调整更为显著。沉积物从内陆架向中陆架的再分布，会随着陆架演化过程衰减预估波浪，形成调控性反馈环路。与之相反，在坡度为0.0003的平缓陆架区段，有效的波浪衰减限制了跨陆架输沙与地貌变化。本研究结果表明，北极日益增强的浪况所带来的地貌动力学反馈效应取决于陆架几何形态，并可能影响未来的海岸侵蚀过程。 本实验设置包含两组代表性跨陆架剖面（分别位于美国阿拉斯加州哈里森湾附近与弗莱克斯曼岛附近），在两种浪况条件下分别开展了1000年的地貌动力学演化模拟，两种浪况分别为“当前工况”波浪与“RCP8.5”预估波浪。浪况数据取自公开数据集（Casas-Prat等人，2018）。针对阿拉斯加波弗特陆架，我们构建了1979-2005年波浪后报时段与2081-2100年RCP8.5预估时段的年际时间序列数据（Casas-Prat等人，2018）。其中1979-2005年波浪后报数据下文称为当前工况波浪，2081-2100年预估数据集称为RCP8.5波浪。随后，我们选取一个典型的波弗特海风暴事件，作用于四个输出陆架剖面，以评估陆架几何形态对波浪衰减的影响。 数据集包含以下内容： 1) 用于1000年模拟的Delft3D-FLOW模型配置文件 a) 阿拉斯加州哈里森湾 i) 当前工况波浪 ii) RCP8.5波浪 b) 阿拉斯加州弗莱克斯曼岛 2) 用于典型风暴试验的Delft3D-FLOW模型配置文件 3) 用于模型结果（含上述1、2项）的Matlab处理后结构数据与元数据 当前工况与RCP8.5波浪数据集取自如下研究生成的北极浪况预估结果：Casas-Prat, M., Wang, X. L., and Swart, N. (2018). 基于耦合模式比较计划第五阶段（Coupled Model Intercomparison Project Phase 5, CMIP5）的全球浪况预估（覆盖整个北冰洋）. 《海洋建模》, 123(2017年4月), 66–85. https://doi.org/10.1016/j.ocemod.2017.12.003