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首页> 外文期刊>Estuarine Coastal and Shelf Science >Particle size characterization of historic sediment deposition from a closed estuarine lagoon, Central California
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Particle size characterization of historic sediment deposition from a closed estuarine lagoon, Central California

机译：加利福尼亚中部封闭河口泻湖历史沉积物沉积的粒度表征

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Recent studies of estuarine sediment deposits have focused on grain size spectra as a tool to better understand depositional processes, in particular those associated with tidal inlet and basin dynamics. The key to accurate interpretation of lithostratigraphic sequences is establishing clear connections between morphodynamic changes and the resulting shifts in sediment texture. Here, we report on coupled analysis of shallow sediment profiles from a closed estuarine lagoon in concert with recent changes in lagoon morphology reconstructed from historic sources, with a specific emphasis on the ability of suite statistics to provide meaningful insights into changes in sediment transport agency. We found that a major reorganization in lagoon morphology, dating to the 1940s, was associated with a shift in sediment deposition patterns. The restricted inlet was associated with deposition of sediments that were finer, less negatively skewed, and less leptokurtic in distribution than sediments deposited while the lagoon had a more open structure. These shifts are associated with a change in transport process from fluvial (through-flow) to closed basin (trapping). We also found other chemostratigraphic changes accompanying this shift in sediment texture, reflecting changes in organic matter source, wetland species composition, and an increase in sediment organic content, as presumably coarse, well-ventilated floodplain sediments tend to result in mineralization rather than sequestration of organic matter. In conclusion, we found that grain size analysis, in concert with the suite statistics technique, reflected changes in coastal configuration supported by historic maps and photos, however, we also recognize that this analysis was more informative given further context through additional sedimentary analyses. These findings provide a basis for the interpretation of particle size distribution in lithostratigraphic sequences associated with bar-built estuaries, where understanding natural and anthropogenically-modified inlet dynamics may help shape conservation management where concerns exist with respect to fish passage, water quality, and sediment transport.
机译：河口沉积物的最新研究集中在粒度谱上，以更好地了解沉积过程，特别是与潮汐入口和盆地动力学有关的沉积过程。准确解释岩石地层层序的关键是在形态动力学变化与沉积物结构变化之间建立清晰的联系。在这里，我们报告了一个封闭的河口泻湖的浅层沉积物剖面的耦合分析，以及从历史资料来源重建的泻湖形态的最新变化，并特别强调了套件统计数据的能力，以提供有意义的洞察力，以了解沉积物输送机构的变化。我们发现，可追溯到1940年代的泻湖形态的重大重组与沉积物沉积模式的变化有关。与泻湖结构更为开放的沉积物相比，受限的入口与沉积物的沉积有关，沉积物更细，负偏斜程度较小，并且七聚体分布较少。这些变化与从河流（直流）到封闭盆地（诱集）的运输过程变化有关。我们还发现伴随沉积物质地变化的其他化学地层学变化，反映了有机质来源，湿地物种组成的变化以及沉积物有机物含量的增加，因为大概是通风良好的漫滩平原沉积物往往导致矿化而不是固存。有机物。总之，我们发现粒度分析与套件统计技术相结合，可以反映出历史地图和照片所支持的沿海构造的变化，但是，我们也认识到，通过进一步的沉积分析，这种分析在提供更多背景信息的情况下更具参考价值。这些发现为解释与条形河口相关的岩石地层学层序中粒径分布提供了基础，在这种情况下，了解自然和人为改变的进水口动态可能有助于在鱼类通过，水质和沉积物方面存在顾虑的情况下进行保护管理。运输。

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