Influence of a spatially complex framework geology on barrier island geomorphology
Influence of a spatially complex framework geology on barrier island geomorphology
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空间复杂骨架地质对障壁岛地貌的影响
DOI：
10.1016/j.margeo.2018.01.011
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发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
Reece, Bobby
中科院分区：
文献类型：
--
作者：
Wernette, Phillipe;Houser, Chris;Weymer, Bradley A.;Everett, Mark E.;Bishop, Michael P.;Reece, Bobby
格架地质可以影响堰洲岛对风暴的响应和恢复，以及相对海平面上升的岛屿海侵。格架地质对堰洲岛地貌的影响先前已经在格架沿海岸有节奏或由孤立的古水道或海岬组成的地区进行了研究。本文的目的是研究格架地质对美国德克萨斯州帕德雷岛国家海岸（PAIS）海滩和沙丘地貌的影响，该海岸的格架地质变化很大。沿着~100 km的研究区域，使用自动化方法从地形和测深数字高程模型（DEM）中提取沿海海滩和沙丘形态测量和海上测深剖面，并使用电磁感应（EMI）测量来绘制地下框架地质图。使用小波分解、全局小波（GW）和双相干分析来测试提取的岸线指标之间和内部的空间关系。GW趋势线表明，海滩和沙丘形态计量学受构造控制。框架地质与沿岸岛屿形态测量的小波相干图热点表明，古河道对岛屿的解剖影响了海滩和沙丘的形态，在古河道直接向陆的区域发现了大型沙丘。岸滩和沙丘形态测量学的双相干分析表明，格架地质导致的低频振荡与高频振荡相互作用，在古河道直接向陆的沙丘线上具有更大的小尺度变异。这些结果表明，PAIS古河道非线性地影响了海滩和沙丘的形态，进而改变了岛屿对风暴和海平面上升的响应。本文认为，了解格架地质是预测岛屿对海平面上升响应的关键，需要将格架地质纳入堰洲岛模型。本文表明，不规则的框架地质影响小尺度的海岸过程，并产生跨尺度的相互作用，影响海滩和沙丘形态，影响堰洲岛对风暴和海平面上升的响应。
Barrier island response and recovery to storms, and island transgression with relative sea level rise, can be influenced by the framework geology. The influence of framework geology on barrier island geomorphology has previously been examined in areas where the framework is rhythmic alongshore or consists of an isolated paleo-channel or headland. The purpose of this paper is to examine the influence of framework geology on beach and dune geomorphology at Padre Island National Seashore (PAIS), Texas, USA, where the framework geology is variable alongshore. Alongshore beach and dune morphometrics and offshore bathymetric profiles were extracted from a combined topography and bathymetry digital elevation model (DEM) using an automated approach along the ~100 km study area, and an electromagnetic induction (EMI) survey was used to map the subsurface framework geology. Wavelet decomposition, Global Wavelet (GW), and bicoherence analyses were used to test for spatial relationships between and within the extracted alongshore metrics. GW trendlines demonstrate that beach and dune morphometrics are structurally controlled. Hotspots in wavelet coherence plots between framework geology and alongshore island morphometrics indicate that the paleo-channels dissecting the island influence beach and dune morphology, with large dunes found in the area directly landward of the paleochannels. Bicoherence analysis of alongshore beach and dune morphometrics indicates that low-frequency oscillations due to framework geology interact with higher-frequency oscillations, with greater small-scale variability in the dune line directly landward of the paleo-channels. These results suggest that the paleo-channels of PAIS non-linearly influence beach and dune morphology, which in turn alters the response of the island to storms and sea level rise. It is argued that an understanding of the framework geology is key to predicting island response to sea level rise and framework geology needs to be included in barrier island models. This paper demonstrates that an irregular framework geology influences small-scale coastal processes, and creates interactions across scales that influence beach and dune morphology and affects barrier island response to storms and sea level rise.
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影响因子：
2.9
作者：
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DOI：
--
发表时间：
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