Planview Geometry and morphological characteristics of pocket beaches on the Catalan coast (Spain)
Planview Geometry and morphological characteristics of pocket beaches on the Catalan coast (Spain)
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加泰罗尼亚海岸袖珍海滩的平面图几何和形态特征（西班牙）
DOI：
10.1016/j.geomorph.2009.01.005
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
V. Pellegrino
中科院分区：
文献类型：
--
作者：
D. Bowman;J. Guillén;L. López;V. Pellegrino
在开展详细的动态实地试验之前，沿海地形研究是一个相关的初始阶段。本研究的目的是确定72加泰罗尼亚口袋海滩，自然和人工的平面特征，并确定其遮蔽效果，海湾化和平衡状态。在SIGPAC上进行了平面形态测量，1：5000正射影像集和波气候由Puertos del Estado（Wana模型）提供。应用平面形态参数，确定海岸平面景观指数。研究表明，加泰罗尼亚口袋海滩显示出广泛的压痕，这表明没有单一的结构，构造或形态控制主导其平面形状。人造口袋海滩通常显示比天然口袋海滩小的凹痕。岬间距与海滩面积呈正相关。越是锯齿状的海湾，它们的海滩就越短。低锯齿口袋海滩是最宽和最长的。深压痕有助于海滩保护和能量耗散，从而抵消了撕裂效率并抑制了巨型撕裂的形成。袋状海滩通常在结构和海滩形态上表现出沿岸逐渐和中等的变化。三分之一的加泰罗尼亚袖珍海滩是“沉积物饥饿”，即，60%甚至更多的海湾海岸线都没有海滩沉积物。平衡状态的检查表明，大多数的加泰罗尼亚口袋海滩是在一个不稳定的模式，与压痕比是无关的波的曲率。
Coastal planform studies are a relevant initial stage before launching detailed dynamic field experiments. The aim of this study is to define the planform characteristics of 72 Catalan pocket beaches, natural and man-made, and to determine their sheltering effect, embaymentization and their status of equilibrium. Planform measurements were performed on SIGPAC, 1:5000 orthophoto sets and wave climate was provided by Puertos del Estado (Wana model). Planform parameters were applied and coastal planview indexes were determined. The study shows that the Catalan pocket beaches display a wide range of indentation, suggesting that no single structural, tectonic or morphological control dominates their planform. The man-made pocket beaches typically display indentations which are smaller than those shown by natural pocket beaches. Headland spacing and beach area are positively correlated. The more indented bays are, the shorter their beaches become. Low-indented pocket beaches are the widest and the longest ones. Deep indentation contributes towards beach protection and energy dissipation which counteracts rip efficiency and inhibits the formation of mega-rips. Pocket beaches often show gradual and moderate alongshore changes in texture and beach morphology. One third of the Catalan pocket beaches are “sediment starved”, i.e., 60% and more of their embayed shorelines are deprived of beach sediments. Examination of the status of equilibrium demonstrates that most of the Catalan pocket beaches are in an unstable mode, with indentation ratios that are unrelated to the wave obliquity.