P. Standring , C.M. Lowery , J. Burstein , J. Swartz , J.A. Goff , S.P.S. Gulick , C.B. Miller
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引用次数: 0
Abstract
Regional variability of global sea-level rise remains an important area of study given the vulnerability of sediment-starved coastlines to coastal inundation, especially those in proximity to large population centers. Galveston Bay, Texas, is currently experiencing more than double the global rate of sea-level rise and is particularly vulnerable to storm inundation that will further destabilize the coastline. Limitations in instrumental observations necessitate the use of the geologic record preserved offshore modern Galveston Bay to understand how this particular coastline responds to periods of rapid sea-level rise. We present micropaleontological analysis of sediment cores combined with high-resolution seismic data to reconstruct the Holocene paleoestuary offshore Galveston Bay and its evolution since initial inundation ∼10 ka through marine transgression ∼6 ka. We find that despite rapid sea-level rise, the Galveston paleoestuary maintained relatively stable outer boundaries, and within the bay environmental shifts occurred as a result of probable marine incursions due to tidal inlet migrations. Paleoenvironmental changes in the early Holocene coincide with flooding events within other Texas Gulf Coast bays suggesting global sea-level rise played a prominent role. Middle to late Holocene changes occurred when rates of sea-level rise slowed, suggesting regional hydroclimate change played a more dominant role.
全球海平面上升的区域变异性仍然是一个重要的研究领域，因为沉积物匮乏的海岸线很 容易被沿海洪水淹没，特别是那些靠近大型人口中心的海岸线。得克萨斯州加尔维斯顿湾目前的海平面上升速度是全球上升速度的两倍多，特别容易被风暴淹没，从而进一步破坏海岸线的稳定。由于仪器观测的局限性，有必要利用现代加尔维斯顿湾近海保存的地质记录来了解这条特殊的海岸线是如何应对海平面快速上升时期的。我们结合高分辨率地震数据，对沉积物岩芯进行了微古生物学分析，重建了加尔维斯顿湾近海全新世古河口及其自 10 ka ka 初期淹没至 6 ka 海洋侵蚀的演变过程。我们发现，尽管海平面迅速上升，但加尔维斯顿古河口仍保持着相对稳定的外部边界，而海湾内部的环境变化则可能是潮汐入口迁移造成的海洋入侵的结果。全新世早期的古环境变化与得克萨斯州海湾沿岸其他海湾的洪水事件相吻合，这表明全球海平面上升起到了重要作用。全新世中期到晚期的变化发生在海平面上升速度放缓之时，这表明区域水文气候的变化发挥了更主要的作用。
期刊介绍：
Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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