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Modification of Dune Erosion by adjacent Coastal Systems (MoDECS)

邻近海岸系统对沙丘侵蚀的影响 (MoDECS)

基本信息

批准号：
388261860
负责人：
Dr.-Ing. Pushpa Dissanayake, Ph.D.
金额：
--
依托单位：
Arbeitsgruppe Sedimentologie, Küsten- und Schelfgeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/388261860?language=en
关键词：
Modification Dune Erosion adjacent Coastal

项目摘要

Coastal beach and dune systems have high economic and environmental values, and provide a natural defence for the hinterland against the marine forcings (tides, waves, sea level rise), particularly during storm events. Commonly beach-dune systems on straight sand plains are taken into account in scientific analyses. However, the presence of adjacent coastal morphological elements (ebb tidal-deltas, inlet channels) changes the marine forcing and modifies dune erosion characteristics. The main objective of this research is to understand the communication between coastal elements and gain insights into the modification of storm erosion processes by investigating three distinct coastal systems: 1) Isolated Dune System (IDS), 2) Barrier-island Dune System (BDS) and 3) Estuarine Dune System (EDS). A novel approach uses a simplified (and therefore generic) representation of the exemplary dune systems from Hütelmoor (IDS), Norderney (BDS) in Germany and Sefton coast (EDS) in UK, located in different energy environments (tidal range, wave height). Numerical experiments using XBeach, Delft3D and SWAN models will be carried out with three schematisations of the dune systems (cross-shore dune profiles, two-dimensional dune areas and a model-based BDS), of which the complexity gradually increases, to simulate the storm erosion processes. In the first year of the project, a morphodynamically relevant storm definition will be initially established for the numerical experiments and used to define the previously occurred storm events at the three dune systems. Then, the cross-shore profiles will be simulated to investigate the erosion sensitivity to the bed topographic parameters like dune slope and dune width. In the second year, the two-dimensional areas will be simulated to investigate the impacts on the storm erosion processes by the morphological elements of inlets and estuarine environments, and the flow and sediment discharges. In the third year, a model-based beach and dune system which has a complex channel and shoal pattern similar to the nature of the BDS will be developed using long period (decadal) simulations. This will then be used to investigate the impacts of two climate change scenarios (sea level rise and storm occurrence) on the storm erosion at dunes surrounded by the morphological elements. Research findings will be disseminated via journal articles (Climatic Change) and conference proceedings.The project duration is 3 years and the host institution is Center for Marine Environmental Sciences (MARUM), University of Bremen. The research will be carried out in close collaboration with the internal and the external researchers (NOC: Liverpool, UNESCO-IHE: Delft, IOW: Warnemünde and CRS: Norderney). Annual meetings will be convened with the relevant experts to discuss findings and to receive feedback.

沿海海滩和沙丘系统具有很高的经济和环境价值，为内陆地区抵御海洋作用力（潮汐、波浪、海平面上升）提供了天然屏障，特别是在风暴期间。在科学分析中，通常会考虑到平直沙地平原上的海滩沙丘系统。然而，相邻的海岸形态要素（退潮三角洲，入口通道）的存在下，改变海洋强迫和修改沙丘侵蚀特征。本研究的主要目的是了解海岸要素之间的沟通，并通过调查三个不同的海岸系统获得对风暴侵蚀过程的修改的见解：1）孤立沙丘系统（IDS），2）障壁-岛屿沙丘系统（BDS）和3）河口沙丘系统（EDS）。一种新的方法使用一个简化的（因此通用的）代表性沙丘系统从Hütelmoor（IDS），Norderney（BDS）在德国和塞夫顿海岸（EDS）在英国，位于不同的能源环境（潮差，波高）。将利用XBeach、Delft 3D和SWAN模式进行数值试验，采用三种沙丘系统示意图（跨岸沙丘剖面、二维沙丘区域和基于模式的BDS），其复杂性逐渐增加，以模拟风暴侵蚀过程。在项目的第一年，将为数值试验初步建立一个与形态动力学有关的风暴定义，并用于定义三个沙丘系统以前发生的风暴事件。然后，将模拟跨岸剖面，以研究侵蚀对沙丘坡度和沙丘宽度等河床地形参数的敏感性。在第二年，二维区域将被模拟，以调查的风暴侵蚀过程的影响，通过形态要素的入口和河口环境，以及流量和泥沙排放。在第三年，将利用长期（十年）模拟，开发一个基于模型的海滩和沙丘系统，该系统具有与BDS性质相似的复杂的水道和浅滩格局。然后，这将被用来调查两个气候变化情景（海平面上升和风暴发生）的影响，在沙丘周围的形态要素的风暴侵蚀。研究结果将通过期刊文章（气候变化）和会议记录传播，项目期限为3年，主办机构为不莱梅大学海洋环境科学中心。研究将与内部和外部研究人员（NOC：利物浦，UNESCO-IHE：德尔夫特，IOW：Warnemünde和CRS：Norderney）密切合作进行。将与有关专家举行年度会议，讨论调查结果并听取反馈意见。