Contribution of Hurricane Ike storm surge sedimentation to long-term aggradation of Southeastern Texas coastal marshes
Contribution of Hurricane Ike storm surge sedimentation to long-term aggradation of Southeastern Texas coastal marshes
复制标题
飓风艾克风暴潮沉积对德克萨斯州东南部沿海沼泽长期加剧的贡献
DOI：
10.2112/si65-142.1
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发表时间：
2016
影响因子：
3.9
通讯作者：
Emily E. Denlinger
中科院分区：
文献类型：
--
作者：
H. Williams;Emily E. Denlinger
摘要威廉姆斯，H.F.L.和Denlinger，E.飓风艾克风暴潮沉积对德克萨斯州东南部沿海沼泽长期淤积的贡献飓风风暴潮将沿岸的沉积物输送到内陆，可能是沿海沼泽长期淤积的重要机制。飓风艾克于2008年9月13日在得克萨斯州加尔维斯顿附近登陆，产生了巨大的风暴潮，淹没了得克萨斯州东南部加尔维斯顿湾和路易斯安那州边界萨宾山口之间长达100公里的沿海沼泽。这项研究的目的是测量飓风产生的沉积物输入长期沼泽加积的贡献。2009年1月，对德克萨斯州东南部沿海沼泽地的风暴潮存款进行了实地调查，并于2010年1月再次进行调查。结果表明，该存款保存完好，并形成了一个向陆逐渐变细的楔形桑迪泥沉积物，延伸数百至数千米的内陆。铯-137测年被用来估计十年尺度的沉积速率在七个沿海沼泽地定位沿着两个断面附近的海岸线开始，并向内陆延伸，与风暴潮方向一致。长期沉积速率，包括飓风艾克带来的沉积物，每年约为0.5至1.6厘米，并随着沿着两个断面向内陆的距离而下降。在1950-2008年的58年期间，飓风艾克的风暴潮存款占这些地点总沉积量的42%至73%。研究结果表明，飓风风暴潮可能是研究区沿海沼泽长期淤积的主要机制。
ABSTRACT Williams, H.F.L. and Denlinger, E. Contribution of Hurricane Ike storm surge sedimentation to long-term aggradation of Southeastern Texas coastal marshes Hurricane storm surges transport littoral sediment inland and may represent an important mechanism for long-term aggradation of coastal marshes. Hurricane Ike made landfall near Galveston, Texas, on September 13th 2008, generating a large storm surge that flooded 100 km of coastal marshes in southeastern Texas between Galveston Bay and the Louisiana border at Sabine Pass. The objective of the study was to measure the contribution of the hurricane-derived sediment input to long-term marsh aggradation. A field survey of the storm surge deposit in southeastern Texas coastal marshes was conducted in January 2009 and repeated in January 2010. The results show that the deposit is well-preserved and forms a landward-tapering wedge of sandy to muddy sediments that extends hundreds to thousands of meters inland. Cesium-137 dating was used to estimate decadal-scale sedimentation rates at seven coastal marsh sites positioned along two transects beginning near the coastline and extending inland, aligned with the storm surge direction. Long-term sedimentation rates, including the sediment input from Hurricane Ike, vary from about 0.5 to 1.6 cm/year and decline with distance inland along both transects. The storm surge deposit of Hurricane Ike contributed between 42 % and 73 % of overall sedimentation at these sites in the 58-year period 1950–2008. The study findings suggest that hurricane storm surges may be the predominant mechanism for long-term aggradation of coastal marshes in the study area.