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首页> 外文期刊>Wetlands >Influence of Inundation and Suspended-Sediment Concentrations on Spatiotemporal Sedimentation Patterns in a Tidal Freshwater Marsh
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Influence of Inundation and Suspended-Sediment Concentrations on Spatiotemporal Sedimentation Patterns in a Tidal Freshwater Marsh

机译：潮汐淡水沼泽中淹没和悬浮物浓度对时空沉积模式的影响

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Long-term marsh sustainability is threatened by environmental changes, especially accelerated rates of sea-level rise (SLR) and changing fluvial sediment supplies. Although direct observations of long-term marsh responses to these changes are challenging, this study examines shorter-term responses via bimonthly sedimentation measurements over 5years in Dyke Marsh Preserve (DMP), a tidal freshwater marsh in the Potomac River (Chesapeake Bay tributary, USA). Observed patterns are evaluated with physical drivers (winds, river discharge, water-level changes, suspended-sediment concentrations (SSC)) that influence spatiotemporal variability within the marsh. Linear regression models reveal that water-level changes exert more influence on this variability than SSC in a system with plentiful sediment supply. Sedimentation rates increase linearly with inundation time, but a quadratic regression model explains more of the variability, especially for the inorganic fraction of sediment. This result indicates that fluvial sediment supply is key for marsh accretion and suggests an optimal response of sedimentation to increased inundation that non-linearly affects marsh vulnerability to future SLR. Ultimately, the SSC in adjacent waters is not available to nourish the marsh unless it is transported and retained on the platform. Self-sustaining feedbacks among inundation, sedimentation, elevation, and plants likely aid in maintaining equilibrium elevations over time and thus also marsh sustainability.
机译：环境变化，尤其是海平面上升速度的加快和河流沉积物供应的变化，威胁着沼泽的长期可持续性。尽管直接观察对这些变化的长期沼泽响应具有挑战性，但本研究通过五年来在波托马克河（切萨皮克湾支流，美国，波多马克河）的潮汐淡水沼泽Dyke Marsh Preserve（DMP）中，通过超过5年的双月沉积测量研究了短期响应。 ）。观测到的模式是通过影响沼泽内时空变化的物理驱动因素（风，河流流量，水位变化，悬浮泥沙浓度（SSC））进行评估的。线性回归模型表明，在有大量泥沙供应的系统中，水位变化对这种变化的影响大于SSC。沉积速率随淹没时间线性增加，但是二次回归模型解释了更多的变异性，尤其是对于沉积物的无机部分。该结果表明，河流沉积物供应是沼泽增生的关键，并提出了沉积物对淹没增加的最佳响应，非线性对沼泽对未来单反的脆弱性产生非线性影响。最终，除非将其运输并保留在平台上，否则相邻水域中的SSC无法用于滋养沼泽。淹没，沉积，海拔和植物之间的自我维持反馈可能有助于维持一段时间内的平衡海拔，从而也破坏了沼泽的可持续性。

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