Meso-scale barrier estuary disturbance, response and recovery behaviour: Evidence of system equilibrium and resilience from high-resolution particle size analysis
Meso-scale barrier estuary disturbance, response and recovery behaviour: Evidence of system equilibrium and resilience from high-resolution particle size analysis
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中尺度屏障河口扰动、响应和恢复行为：高分辨率粒度分析的系统平衡和恢复力证据
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Plater
中科院分区：
文献类型：
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作者：
David W. Clarke;J. Boyle;J. Lario;A. Plater
确定沿海湿地的未来轨迹，特别是其扰动、应对和恢复机制的性质，对广泛的利益攸关方和环境管理人员至关重要。重建沿海环境的中尺度行为可有助于调整沿海资源管理战略，使之适应系统运作的自然尺度，从而促进真正的可持续性。从佩斯卡德罗沼泽，在加州的后屏障沿海湿地，沉积物进行了分析，其粒径分布在连续的2毫米部分向下的核心。粒径数据反映了过去的变化，在障碍相干性驱动的后障碍区的流体动力学变化。当考虑在一起，向下的核心平均粒径的趋势和粒径分布曲线的风格提供了相当大的洞察到中尺度系统的行为，揭示障碍/背障干扰响应恢复制度，制度转变和非周期性的高能量事件在干扰这些制度的作用。在次年度和多年度的时间段内，佩斯卡德罗系统的行为是一贯的特点是动态响应干扰和恢复，通过负反馈。此外，在分析的核心部分的持续时间，即1200-2300年，该系统被确定为采取了一系列的静态平衡状态。根据佩斯卡德罗沉积物记录重建的屏障河口行为表明了固有的环境恢复力。
Establishing the future trajectories of coastal wetlands, especially the nature of their disturbance, response and recovery regimes, is of critical importance for a wide range of stakeholders and environmental managers. Reconstructing meso-scale behaviour in coastal environments can serve to attune coastal resource management strategies to natural scales of system operations, thus fostering genuine sustainability. Sediments from Pescadero Marsh, a back-barrier coastal wetland in California, were analysed down-core for their particle size distribution in consecutive 2-mm sections. The particle size data reflect changing hydrodynamics in the back-barrier area driven by past variations in barrier coherence. When considered together, the down-core mean particle size trend and particle size distribution curve styles provide considerable insight into meso-scale system behaviour, revealing barrier/back-barrier disturbance–response–recovery regimes, regime shifts and the role of aperiodic high-energy events in disturbing these regimes. Over sub-annual and multi-annual time periods, the behaviour of the Pescadero system was consistently characterised by both dynamic response to disturbance and recovery through negative feedback. Furthermore, over the duration of the analysed core section, that is, 1200–2300 years, the system was determined to have adopted a series of static equilibrium states. The barrier estuary behaviour reconstructed from the Pescadero sediment record is indicative of innate environmental resilience.