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首页> 外文期刊>Journal of Coastal Research: An International Forum for the Littoral Sciences >Island Edge Morphodynamics along a Chronosequence in a Prograding Deltaic Floodplain Wetland
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Island Edge Morphodynamics along a Chronosequence in a Prograding Deltaic Floodplain Wetland

机译：沿着一项促进的红外洪泛区湿地的岛屿边缘形态学

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Much of the previous research on coastal deltaic land building has focused on the planform delta dimensions; whereas this research focuses on shifts in vertical elevation and deltaic island edge cross-sectional morphology in relation to a proposed conceptual model of deltaic island edge morphological development. This study was conducted using data collected from the Wax Lake Delta in the northern Gulf of Mexico. Island edge cross-sectional elevation profiles were extracted from a 2012 LIDAR elevation survey. Four morphometric variables (levee width, interior slope, mean elevation range, and total elevation range) were selected to describe the shape of each of these profiles, and each profile was also assigned to an age class, which was determined based on mapping of historic deltaic island extent from aerial imagery. Multivariate analysis of variance was used to test the effect of age class and distance from the upstream end of the island on these four morphometric variables. Results indicated that both age and the distance within age were statistically significant predictors of island edge cross-sectional morphology. Field-surveyed elevation transects also followed the predicted pattern of morphologic change and illustrated that the shifts in morphology can occur very rapidly within this system-over a matter of a few months-as the result of a single large river flood. High soil percent organic matter was also found to correlate to high elevation in field-surveyed transects, indicating that biological processes such as organic matter production and accretion may also play an important role in morphological development of deltaic floodplain wetlands.
机译：以前关于沿海红兰陆地建设的大部分研究都集中在Planform Delta尺寸上;然而，这项研究侧重于垂直高程和红细胞岛边缘横截面形态的转变，而达到三角岛边缘形态发展的建议概念模型。使用从墨西哥北部的蜡湖三角洲收集的数据进行了本研究。从2012年LIDAR高程调查中提取岛边缘横截面高度型材。选择四个形态差变量（堤坝宽度，内坡，平均升高范围和总升高范围）来描述这些轮廓中的每一个的形状，并且每个配置文件也被分配给年龄类，这是基于历史的映射确定的来自空中图像的红外岛屿范围。使用多变量的方差分析来测试年龄阶级和距离岛上的距离的距离在这四个形态学变量上的效果。结果表明，年龄和年龄距离的距离是群岛边缘横截面形态的统计上显着的预测因子。现场测量的升高横断面遵循了形态学变化的预测模式，并说明了形态的变化在这个系统内可能非常迅速 - 几个月 - 由于单个大河洪水的结果。还发现高土壤百分比有机物与现场调查的拐点中的高升高相关，表明有机物质产生和增生等生物过程也可能在普通洪泛区湿地的形态学发展中起重要作用。

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