Factors controlling the survival of coastal dunes during multiple hurricane impacts in 2004 and 2005: Santa Rosa barrier island, Florida
Factors controlling the survival of coastal dunes during multiple hurricane impacts in 2004 and 2005: Santa Rosa barrier island, Florida
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DOI：
10.1016/j.geomorph.2007.06.004
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发表时间：
2008-03-15
期刊：
影响因子：
3.9
通讯作者：
Horwitz, Mark H.
中科院分区：
文献类型：
--
作者：
Claudino-Sales, Vanda;Wang, Ping;Horwitz, Mark H.
圣罗莎岛是一个85公里长、以波浪为主的低洼屏障岛，位于沿着佛罗里达西北海岸，面向墨西哥湾。整个岛屿都受到伊万的严重影响，伊万是一个强大的3级飓风，于2004年9月在以西约45公里处登陆。10个月后的2005年7月，另一个3级飓风丹尼斯在该岛西端以东约30公里处登陆。圣罗莎岛的特点是发育良好，但相对较低的沙丘，在本文中描述为初期和建立沙丘，根据存在的草和木本类型的植被，分别。沙丘被两次飓风严重侵蚀。本文研究了区域尺度沙丘破坏与生存的控制因素，沙丘生存受飓风特征（包括强度、持续时间和频率）和地貌参数（包括屏障岛宽度、沙丘高度和宽度、植被类型、沙丘与海洋的距离以及沙丘的连续性）的控制。沙丘破坏的三个过程，包括从最严重到最不严重，淹没，过洗，陡坎。上述因素的相互作用决定了沙丘对风暴冲击的不同响应。一般来说，海湾海岸线附近的广泛和茂密的木本植被沙丘地在风暴中幸存下来，而海湾海岸线附近的不连续沙丘和草植被几乎完全被摧毁。(C)2007 Elsevier B.V保留所有权利。
Santa Rosa Island is an 85 km-long, wave-dominated low-lying barrier island situated along the northwestern Florida coast, facing the Gulf of Mexico. The entire island was severely impacted by Ivan, a strong category 3 hurricane that made landfall about 45 km to the west in September of 2004. Ten months later in July of 2005, Dennis, another category 3 hurricane, made landfall about 30 km east of the western tip of the island. Santa Rosa Island is characterized by well-developed but relatively low dunefields, described in this paper as incipient and established dunes, based on the presence of grassy and woody types of vegetation, respectively. The dunes were severely eroded by the two hurricanes. This paper investigates the factors controlling the regional-scale destruction and survival of the dunefields.Dune survival is controlled by: 1) hurricane characteristics, including intensity, duration, and frequency, and 2) morphological parameters including width of the barrier island, height and width of the dunefields, vegetation type, distance of the dunes to the ocean, and continuity of the dunefields. Three processes of dune destruction are described including, from most to least severe, inundation, overwash, and scarping. The interaction of all the above factors determines the different dune responses to the storm impacts. In general, the extensive and densely woody vegetated dunefields near the bay-side shoreline survived the storms, while the discontinuous dunes with grassy vegetation near the Gulf shoreline were almost completely destroyed. (C) 2007 Elsevier B.V All rights reserved.