Foredune morphodynamics and sediment budgets at seasonal to decadal scales: Humboldt Bay National Wildlife Refuge, California, USA
Foredune morphodynamics and sediment budgets at seasonal to decadal scales: Humboldt Bay National Wildlife Refuge, California, USA
复制标题
季节到十年尺度的 Foredune 形态动力学和沉积物预算：美国加利福尼亚州洪堡湾国家野生动物保护区
DOI：
10.1016/j.geomorph.2018.06.003
复制
发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Bauer, Bernard O.
中科院分区：
文献类型：
--
作者：
Rader, Alana M.;Pickart, Andrea J.;Walker, Ian J.;Hesp, Patrick A.;Bauer, Bernard O.
沿海沙丘是在后岸形成的与海岸平行的山脊，其地貌动力学部分受海岸(岸上)沉积物收支的季节和空间变化控制，而海岸(岸上)沉积物收支的季节和空间变化又受海洋和大气过程和相互作用的驱动，包括区域海浪和风向、气候变化事件(例如ENSO)、沉积物可获得性、海滩特征(例如宽度、坡度)以及后岸的植被类型和覆盖。以前关于北加州海岸线变化的研究只报告了与区域气象制度有关的广泛的侵蚀和淤积速率。这项研究更详细地描述了洪堡湾国家野生动物保护区(HBNWR)2.5 公里海岸线上的海岸线响应和森林地形动力学。对历史航拍照片(1939-2014)的分析揭示了海岸线位置的趋势，同时还对跨海岸地形剖面的森林地形动态和季节性尺度体积变化进行了更详细的评估。这些发现建立了沙丘地貌动力学的历史背景，并可以探索季节气象变化对HBNW.DSAS长期(75年)沙丘演变和发展的影响。DSAS描述了北部最大的沙丘进积(高达+0.51 m a−1)和南部的最大沙丘退缩(高达−0.49 m a−1)。航空照片分析(2004-2014)显示，在统计上，南部地区的侵蚀特征明显大于北部和中部地区。从横岸剖面计算的季节性体积表明，近岸样带高程和沙丘体积在统计上存在显著差异，北部和中部地带的高程和体积比南部大。结合季节性双向沿岸漂移的证据，这些数据支持沉积物有效性、沙丘位置和由此形成的沙丘发育阶段的南北梯度。季节性风暴能量和气候强迫事件在侵蚀模式中引入了变异性，但支持了沿岸发展阶段的持续性。未来的研究应在较小的空间尺度上探索沙丘地貌动态，以及与多种植被组合的存在/不存在有关的变化。
Coastal foredunes are shore-parallel ridges that form in the backshore and their morphodynamics are controlled partly by seasonal and spatial variations in the coastal (onshore) sediment budget that, in turn, are driven by oceanic and atmospheric processes and interactions, including regional wave and wind regimes, climatic variability events (e.g., ENSO), sediment availability, beach characteristics (e.g., width, slope), and vegetation type and cover in the backshore. Previous studies on shoreline change in Northern California report only broad rates of erosion and accretion related to regional meteorological regimes. This study presents a more detailed, multi-decadal to seasonal account of shoreline response and foredune morphodynamics along a 2.5 km stretch of coast in the Humboldt Bay National Wildlife Refuge (HBNWR). Analysis of historical aerial photography (1939–2014) reveals trends in shoreline position that are coupled with more detailed assessments of foredune morphodynamics and seasonal scale volumetric changes from cross-shore topographic profiles``. These findings set the historical context of foredune morphodynamics and allow exploration of the implications of seasonal meteorological variation on long-term (75-year) foredune evolution and development at the HBNWR.DSAS describes maximum foredune progradation in the north (up to +0.51 m a−1) and maximum foredune retreat in the south (up to −0.49 m a−1). Aerial photograph analysis (2004–2014) shows statistically significant larger erosive features in the southern zone than in the northern and central zones. Seasonal volume calculations from cross-shore profiles indicate statistically significant differences in alongshore transect elevation and foredune volume, with larger elevations and volumes in the northern and central zones than in the southern. Combined with evidence of seasonal bidirectional littoral drift, these data support a north to south gradient in sediment availability, foredune position and resulting stages of established foredune development. Seasonal storm energies and climate forcing events introduce variability in erosive patterns but support the persistence of alongshore developmental stages. Future research should explore foredune morphodynamics on a smaller spatial scale and changes related to the presence/absence of multiple vegetation assemblages.
登录
查看更多内容
影响因子：
16.6
作者：
Barnard PL;Hoover D;Hubbard DM;Snyder A;Ludka BC;Allan J;Kaminsky GM;Ruggiero P;Gallien TW;Gabel L;McCandless D;Weiner HM;Cohn N;Anderson DL;Serafin KA
通讯作者：
Serafin KA
影响因子：
2.9
作者：
A. Sallenger;W. Krabill;J. Brock;R. Swift;S. Manizade;H. Stockdon
通讯作者：
A. Sallenger;W. Krabill;J. Brock;R. Swift;S. Manizade;H. Stockdon
加拿大爱德华王子岛格林威治沙丘前缘系统的年度至十年形态动力学
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
J. Ollerhead;R. Davidson‐Arnott;I. Walker;Sojan Mathew
通讯作者：
Sojan Mathew
冲浪区-海滩-沙丘相互作用：潮间带海滩和后岸的水流和沉积物输送
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
P. Hesp;T. Smyth
通讯作者：
T. Smyth
使用空间统计量化海滩沙丘体积变化的空间和时间趋势
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
J. Eamer;I. Walker
通讯作者：
I. Walker