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Parameterization of erosion vulnerability at coasts with multiple bars: A case study of Baltic Sea coastal segment in Poland
Coastal Engineering ( IF 4.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.coastaleng.2020.103723
Grzegorz Różyński

Abstract The paper proposes a method of detection of erosion-prone, multiple bar beaches only based on recorded bathymetric profiles, without any (frequently missing) hydrodynamic information. For this purpose a 45 km long, pristine coastal segment of the Polish coast was analyzed; the bathymetric profiles there, spaced every 500 m, were measured in 2005 and 2011 from a dune/cliff crest up to a seabed depth of about 15 m. One or two monotonic components were identified in seabed topography with signal processing tools - their shapes closely resemble theoretical upward-concave beach equilibrium profiles, reflecting intensive wave breaking in those regions. Although saturated wave energy dissipation often occurs only along a portion of those regions, the assumption of such regime allows for straightforward evaluation of the uppermost limit of wave energy dissipation capacity for each studied bathymetric profile. This problem was thoroughly examined and validated in the study. Knowing the intensity of energy dissipation in saturated regime and the length of segments where it occurs, we can calculate wave energy dissipation potential profile-by-profile. Hence, erosion prone sub-segments can be identified, where wave energy dissipation is remarkably lower than that established at neighbouring profiles. The presented methodology can be particularly recommended for dissipative beaches with multiple bars, where beach fills are often considered to mitigate coastal erosion.

中文翻译:

多条海岸侵蚀脆弱性参数化:以波兰波罗的海海岸段为例

摘要 本文提出了一种仅基于记录的测深剖面检测易受侵蚀的多条海滩的方法,而没有任何(经常丢失)水动力信息。为此,对波兰海岸 45 公里长的原始海岸段进行了分析;那里的测深剖面每 500 m 间隔一次,是在 2005 年和 2011 年测量的,从沙丘/悬崖顶一直到约 15 m 的海床深度。使用信号处理工具在海底地形中识别出一两个单调分量——它们的形状与理论上的上凹海滩平衡剖面非常相似,反映了这些区域的强烈波浪破碎。虽然饱和波浪能量耗散通常只发生在这些区域的一部分,这种制度的假设允许直接评估每个研究的测深剖面的波浪能量耗散能力的上限。这个问题在研究中得到了彻底的检查和验证。知道饱和状态下能量耗散的强度和它发生的段的长度,我们可以逐个剖面计算波浪能量耗散潜力。因此,可以识别易于侵蚀的子段,其中波浪能耗散明显低于在相邻剖面上建立的。所提出的方法可以特别推荐用于具有多个酒吧的耗散海滩,其中海滩填充通常被认为可以减轻海岸侵蚀。知道饱和状态下能量耗散的强度和它发生的部分的长度,我们可以逐个剖面计算波浪能量耗散潜力。因此,可以识别易于侵蚀的子段,其中波浪能耗散明显低于在相邻剖面上建立的。所提出的方法可以特别推荐用于具有多个酒吧的耗散海滩,其中海滩填充通常被认为可以减轻海岸侵蚀。知道饱和状态下能量耗散的强度和它发生的段的长度,我们可以逐个剖面计算波浪能量耗散潜力。因此,可以识别易于侵蚀的子段,其中波浪能耗散明显低于在相邻剖面上建立的。所提出的方法可以特别推荐用于具有多个酒吧的耗散海滩,其中海滩填充通常被认为可以减轻海岸侵蚀。
更新日期:2020-08-01
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