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SUBMESOSCALE SURFACE TIDAL, VORTICAL, AND RESIDUAL CIRCULATIONS IN A SEMI-ENCLOSED BAY 半封闭海湾的亚中尺度表面潮汐、涡旋和残余环流
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.188
Sung Yong Kim, Kyeong Ok Kim
We scrutinize three different components of submesoscale surface tidal, vortical, and residual circulations in a semienclosed bay using (1) observations of high-frequency radar-derived surface current maps and (2) numerical model simulations run under realistic vertical stratification and boundary conditions at O(1)-km spatial and 1-hourly temporal resolutions over a 2-year period. Based on the spatial statistics of the identified submesoscale eddies and eddy kinetic energy budget analysis, the submesoscale eddies are primarily generated by the detachment of shoreline-following tidal currents at the coastal boundaries, persist for less than 1.5 days, and are dissipated dominantly via vertical buoyancy fluxes associated with bottom bathymetric interactions of the tidal currents. The residual circulation is clearly shown with the nontidal geostrophic currents associated with the pressure gradients generated by wind-driven Ekman transports against the coast and the ageostrophic low-frequency currents.
本文研究了一个半封闭海湾中亚中尺度地面潮汐、涡旋和剩余环流的三个不同组成部分,使用:(1)高频雷达衍生的地面洋流图的观测数据;(2)在真实的垂直分层和边界条件下,以0(1)公里的空间和1小时的时间分辨率进行了2年的数值模式模拟。基于对亚中尺度涡旋的空间统计和涡旋动能平衡分析,亚中尺度涡旋主要由沿岸线的潮流在海岸边界的分离产生,持续时间小于1.5 d,主要通过垂直浮力通量和潮流的底水深相互作用消散。残余环流主要表现为非潮地转流和非地转低频流,这些流与风驱动的Ekman输运对海岸产生的压力梯度有关。
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引用次数: 0
QUANTIFYING THE WAVE-DRIVEN RECOVERY OF SANDY BEACHES FOLLOWING STORM EROSION 量化风暴侵蚀后沙滩的波浪驱动恢复
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.sediment.72
Matthew Phillips
Following the rapid and destructive impacts of storm erosion, beach recovery is a key natural process of restoration, returning eroded sand to the subaerial beach and rebuilding coastal morphology to continue to support the needs of present-day coastal communities. While more detailed attention in international literature has been given to understanding and predicting beach behaviour under regimes of storm erosion, beaches are for most of the time by nature accretionary features. This paper presents critically important advanced new insight and quantification of recovery processes of sandy beaches by waves. Durations and rates of recovery are synthesised from over 70 studies worldwide in a range of wave climates (from low to high wave energy) and tidal settings (from micro- to macrotidal), with a focus primarily on sandy beach coastlines. A holistic perspective of the different processes and indicators that constitute beach recovery is presented, including those in the subaqueous beach related to the post-storm onshore migration of sandbars and storm deposits in deeper offshore waters, as well as processes in the subaerial beach related to the recovery of subaerial sediment volume, shorelines, berms, and dunes.
在风暴侵蚀的快速和破坏性影响之后,海滩恢复是一个关键的自然恢复过程,将被侵蚀的沙子恢复到陆上海滩,重建海岸形态,以继续支持当今沿海社区的需求。虽然国际文献对理解和预测风暴侵蚀下的海滩行为给予了更详细的关注,但海滩在大多数时候都是自然增生的特征。本文提出了波浪对沙滩恢复过程的新认识和定量分析。持续时间和恢复率综合了全球70多项研究,包括波浪气候(从低到高波浪能量)和潮汐环境(从微潮到大潮),主要关注沙滩海岸线。本文全面介绍了构成海滩恢复的不同过程和指标,包括水下海滩中与风暴后沙洲和更深近海风暴沉积物陆上迁移有关的过程,以及陆上海滩中与陆上沉积物体积、海岸线、堤道和沙丘恢复有关的过程。
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引用次数: 1
MULTI-YEAR MONITORING TO DISTINGUISH ENVIRONMENTAL IMPACTS DUE TO WATERFRONT CONSTRUCTION FROM AMBIENT ENVIRONMENTAL CHANGE 多年监测,以区分因滨水建设造成的环境影响和环境变化
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.94
Kevin MacIntosh, Tundi Agardy, Dr. Leo Brewster
In tropical marine systems, water quality, coral health, fish habitat productivity and various other factors (e.g.: water temperature, salinity, turbidity) are all inter-related. Therefore, shoreline development, and the related design and construction of waterfront projects, may have a significant impact on the marine environment, both positive and negative, depending on the location and quality of science, engineering, and marine ecology undertaken during design, construction, and monitoring. Evaluating the physical, ecological, and social impacts of coastal projects after construction is rarely undertaken in any quantitative manner, if at all. As part of our standard process, we include monitoring for a period of 2- 5 years to quantify shoreline stability, water quality impacts, and increases in biological production as well as biodiversity. To determine when environmental arguments against development are valid and to counter those against research due to time and cost pressures, the goal is to identify what is important for minimizing environmental impacts of development.
在热带海洋系统中,水质、珊瑚健康、鱼类栖息地生产力和各种其他因素(例如水温、盐度、浊度)都是相互关联的。因此,岸线开发以及滨水项目的相关设计和施工,可能会对海洋环境产生重大的积极和消极的影响,这取决于在设计、施工和监测过程中所进行的科学、工程和海洋生态的位置和质量。很少以定量的方式评估沿海项目建设后的物理、生态和社会影响,如果有的话。作为我们标准流程的一部分,我们包括2- 5年的监测,以量化海岸线稳定性、水质影响、生物产量和生物多样性的增加。为了确定什么时候反对发展的环境论点是有效的,并反对那些由于时间和成本压力而反对研究的论点,目标是确定对最大限度地减少发展对环境的影响来说什么是重要的。
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引用次数: 0
PRESERVING THE LAST OF ILLINOIS’ SHORELINE: ECOLOGICALLY-DRIVEN SHORELINE STABILIZATION TECHNIQUES FOR INLAND LAKES 保护伊利诺斯州最后的海岸线:内陆湖泊的生态驱动的海岸线稳定技术
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.151
Margaret Boshek, Jack Cox, Dale Brockamp
Illinois Beach State Park (IBSP) represents the last contiguous 6.5 mile pristine shoreline within the State of Illinois. Geologically speaking, the park sits atop a migratory beach-ridge characterized by sand ridges separated by low wetland swales which are home to over 650 species, some of which are rare and threatened. The land itself provides a visual history of the layering of the primary frontal dune marching lakeward as the beach-ridge migrated south. Human development, however, has stabilized the beach ridge to the north, cutting off sand supply to the park. The very coastal process that created this landform will eventually lead to its ruin. Approaching this problem, a number of hydrodynamic and sediment morphology numerical models were used to determine the areas of highest erosion rate within the park.
伊利诺斯州海滩州立公园(IBSP)代表了伊利诺斯州内最后一个连续的6.5英里原始海岸线。从地理上讲,公园坐落在一个迁徙的海滩山脊上,其特征是由低矮的湿地洼地隔开的沙脊,这里是650多种物种的家园,其中一些是稀有和受威胁的物种。这片土地本身提供了一个直观的历史,说明了随着海滩脊向南迁移,初级正面沙丘向湖泊移动的分层过程。然而,人类的发展已经稳定了北部的海滩山脊,切断了公园的沙子供应。造就这种地貌的海岸作用最终会导致它的毁灭。为了解决这个问题,使用了许多水动力和泥沙形态数值模型来确定公园内侵蚀速率最高的区域。
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引用次数: 0
COST BENEFIT ANALYSIS IN COASTAL MANAGEMENT – USEFUL OR FLAWED? 海岸管理的成本效益分析——有用还是有缺陷?
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.97
Ron Cox, Peter Horton, Nigel Rajaratnam, James Carley
Cost Benefit Analysis (CBA) has become an important tool for evaluating coastal management actions in Australia, and various coastal CBA studies have been completed. However, some of these studies have produced contradictory outcomes, and some assumptions on which they were based have been questioned. In the presentation, various assumptions frequently used in coastal CBA’s are considered and assessed with reference to specific case studies.
成本效益分析(Cost - Benefit Analysis, CBA)已成为评估澳大利亚沿海管理行为的重要工具,并完成了各种沿海CBA研究。然而,其中一些研究产生了相互矛盾的结果,并且它们所基于的一些假设受到了质疑。在报告中,参考具体的案例研究,考虑和评估了沿海CBA中经常使用的各种假设。
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引用次数: 0
APPLICATION OF THE MODIFIED LINEAR SUPERPOSITION METHOD FOR TIDE AND STORM SURGE INTERACTION — TROPICAL AND EXTRA-TROPICAL CYCLONES 潮汐和风暴潮相互作用的改进线性叠加法的应用——热带和热带外气旋
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.148
Christopher Bender, Ashley Kauppila, Don Resio
Coastal modeling efforts have applied different ways to handle the interaction of storm surge and tides. In relatively deep water, tidal superposition can be considered an approximately linear process (with the storm-generated water level added to the tide level providing a reasonable total water level). However, in shallow water with restricted access to the ocean, tide and surge superposition can be nonlinear such that simple addition of surge and tide proves inaccurate. The paper and presentation provide an extension of previous work that developed the Modified Linear Superposition (MLS) Method to analyze the interaction of the storm surge with the tide. The method is designed to produce accurate, unbiased results while at the same time not requiring excessive computer resources and time.
海岸建模工作应用了不同的方法来处理风暴潮和潮汐的相互作用。在相对较深的水域,潮汐叠加可以被认为是一个近似线性的过程(风暴产生的水位加到潮汐水位上,提供一个合理的总水位)。然而,在进入海洋受限的浅水中,潮汐和浪涌叠加可能是非线性的,因此简单地将浪涌和潮汐相加是不准确的。本文和报告是对先前研究的扩展,该研究发展了修正线性叠加(MLS)方法来分析风暴潮与潮汐的相互作用。该方法旨在产生准确,无偏的结果,同时不需要过多的计算机资源和时间。
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引用次数: 0
EROSION HOTSPOTS AND BAR DYNAMICS ON THE DANISH WESTCOAST 丹麦西海岸的侵蚀热点和沙洲动态
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.6
Nikolai Heath Sørensen, Per Sørensen
Focused local beach and dune erosion hamper coastal safety in certain vulnerable areas. Erosion hotspots are observed as 300-500 m stretches of coastline with greater levels of erosion than adjoining coastlines. Two erosion hotspots are identified, one on the mid Danish west coast (Ndr. Thorsminde Tange) and one on a north-facing beach in northern Jutland (Tversted). Two erosion hotspots, with different wave climates, are observed and analysed to better understand their controlling mechanisms. Forecasting erosion hotspots’ location and behaviour could be valuable for coastal safety in these areas.
集中的当地海滩和沙丘侵蚀妨碍了某些脆弱地区的海岸安全。在300-500米长的海岸线上观察到侵蚀热点,其侵蚀程度比邻近的海岸线更严重。确定了两个侵蚀热点,一个在丹麦西海岸中部(Ndr)。Thorsminde Tange)和一个在日德兰半岛北部朝北的海滩上(Tversted)。对两个具有不同波浪气候的侵蚀热点进行了观测和分析,以更好地了解它们的控制机制。预测侵蚀热点的位置和行为可能对这些地区的海岸安全有价值。
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引用次数: 0
USING AN AGENT-BASED MODEL TO SIMULATE THE IMPACTS OF AN APPLIED DYNAMIC ADAPTIVE PATHWAYS PLAN 使用基于代理的模型来模拟应用动态自适应路径计划的影响
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.18
Andrew Allison, Scott Stephens, Paula Blackett, Yvonne Matthews, Mark Dickson, Judy Lawrence
Coastal cities and towns are at risk from climate change and relative sea level rise (RSLR). There is uncertainty in how and when these will impact and how to adapt, meaning there is a need for flexible tools to help decision-making and decision-makers. Decision-makers have many available actions to respond to sea level rise and other coastal hazards, but there is uncertainty around which action to take in different situations and when is the best time to act. We use agent-based modelling (ABM) to investigate multi-hazard interaction and Dynamic Adaptive Pathways Planning (DAPP) to explore the impact of an applied DAPP to work with the deep uncertainty around urban coastal systems. We developed an ABM, which included five physical hazards, whose occurrence in time was influenced by six plausible future shared socio-economic pathway / representative concentration pathway (SSP/RCP) scenarios.
沿海城镇面临气候变化和相对海平面上升(RSLR)的风险。这些影响如何、何时产生以及如何适应存在不确定性,这意味着需要灵活的工具来帮助决策和决策者。决策者有许多可用的行动来应对海平面上升和其他沿海灾害,但在不同情况下采取何种行动以及何时采取行动的最佳时机存在不确定性。我们使用基于智能体的模型(ABM)来研究多灾害相互作用,并使用动态自适应路径规划(DAPP)来探索应用DAPP对城市沿海系统周围深度不确定性的影响。我们开发了一个ABM,其中包括五种物理危害,它们的发生时间受到六种合理的未来共享社会经济途径/代表性浓度途径(SSP/RCP)情景的影响。
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引用次数: 0
INCORPORATING CLIMATE CHANGE RESILIENCE INTO A BREAKWATER REPAIR: A CASE STUDY AT HILO, HAWAII 将气候变化适应能力纳入防波堤修复:夏威夷希洛的案例研究
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.structures.84
Jessica H. Podoski, Chris Goody, David Smith
The original breakwater at Hilo Harbor was completed in 1930 and consisted of a 10,080-foot-long rubble-mound breakwater built over Blonde Reef, protecting a 35-foot-deep basin. Recent repairs were completed in 1973, 1975, and 1981. The 1981 repair consisted of a layer of 7.5-ton tribar armor units along 900 feet of the breakwater along the trunk of the structure. The USACE Honolulu District intends to conduct repairs to the Hilo Harbor breakwater within the next 5 to 10 years. A multifaceted analysis has been conducted to optimize future repair design from both an economic investment standpoint, as well as to incorporate evaluation of risk of failure and reliability-based design under projected future forcing conditions. The results of this analysis will be presented including the following: 1) evaluation of breakwater damage using both visual inspection and remote sensing data; 2) an in-depth analysis of present and future breakwater overtopping rates due to extreme waves and sea level rise through the use of spectral phase-averaged wave modeling, Boussinesq phase-resolving models, and high fidelity, fully three-dimensional Computational Fluid Dynamics (CFD) wave modeling; and 3) initial results of reliability-based design to assess past and present performance and damage modes.
希洛港最初的防波堤于1930年完工,由一个10080英尺长的碎石堆防波堤组成,建在金发礁上,保护着一个35英尺深的盆地。最近的维修分别于1973年、1975年和1981年完成。1981年的修复包括沿着900英尺的防波堤沿着结构的主干铺设一层7.5吨的三角装甲单元。USACE檀香山区计划在未来5到10年内对希洛港防波堤进行维修。为了优化未来的维修设计,从经济投资的角度进行了多方面的分析,并结合了在预测的未来强迫条件下的失效风险评估和基于可靠性的设计。该分析的结果将包括以下内容:1)使用目视检查和遥感数据对防波堤损伤进行评估;2)利用频谱相位平均波浪模型、Boussinesq相位解析模型和高保真、全三维计算流体动力学(CFD)波浪模型,深入分析极端波浪和海平面上升导致的当前和未来防波堤过顶率;3)基于可靠性设计的初步结果,以评估过去和现在的性能和损伤模式。
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引用次数: 0
CLIMATE RESILIENT COASTAL SOLUTIONS IN THE CARIBBEAN CONTEXT 加勒比地区气候适应性沿海解决方案
Pub Date : 2023-10-02 DOI: 10.9753/icce.v37.management.165
Amaury Camarena, Aline Kaji, Gabby Mauti
Caribbean Small Island Developing States (SIDS) face a unique set of development challenges and are exposed to some of the most extreme weather events. While the Caribbean region has a limited contribution to climate change drivers, such as greenhouse gas emissions, the region is significantly impacted by the effects of climate change, especially sea level rise, increase in tropical storm intensity, and ocean warming and acidification. The objective of this study is to describe key SIDS case studies completed in recent years, including challenges and opportunities, and to highlight the unique characteristics and lessons learnt that led to the development of the design framework.
加勒比小岛屿发展中国家(SIDS)面临着一系列独特的发展挑战,并面临一些最极端的天气事件。虽然加勒比地区对温室气体排放等气候变化驱动因素的贡献有限,但该地区受到气候变化影响的显著影响,特别是海平面上升、热带风暴强度增加以及海洋变暖和酸化。本研究的目的是描述近年来完成的主要小岛屿发展中国家案例研究,包括挑战和机遇,并强调导致设计框架发展的独特特征和经验教训。
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引用次数: 0
期刊
Proceedings of ... Conference on Coastal Engineering
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