How strong are salt marshes? Geotechnical properties of coastal wetland soils
How strong are salt marshes? Geotechnical properties of coastal wetland soils
复制标题
盐沼的强度有多强？
DOI：
10.1002/esp.5322
复制
发表时间：
2022
影响因子：
3.3
通讯作者：
Brooks H
中科院分区：
文献类型：
--
作者：
Brooks H
盐沼在全球分布，潮间带湿地有植被，许多海岸都有沼泽边缘侵蚀。为了理解沼泽边缘侵蚀发生的方式和原因，必须首先量化盐沼基质对施加剪切和垂直应力的响应。这种反应可能受到沼泽基质生物、地球化学和沉积学组成的影响。然而，目前对这些特性的沼泽间变异性以及它们如何影响沼泽边缘侵蚀过程和沼泽在潮汐框架内保持其垂直位置的能力的系统研究很少。本文比较了英国东部的蒂林厄姆沼泽和西北部的沃尔顿沼泽两处沉积学截然不同的沼泽。土壤抗剪强度和压缩性是通过岩土工程方法确定沼泽抗剪和垂直有效应力来确定的。这项研究能够在三维样品中分离出根对基底抗剪强度的影响。作为对垂直有效应力的响应，沼泽基底的预期位移大小和垂直恢复潜力都受到沼泽上过去的应力条件的影响，特别是由干燥引起的应力条件。基材对竖向有效应力的响应也通过固结对孔隙比（或容重）的影响影响基材的抗剪强度。我们提出了在施加应力下沼泽成分和基质行为之间的联系的证据。研究结果揭示了沼泽抵抗边缘侵蚀的潜在决定因素，这对于基于自然的沿海防洪和沿海恢复计划的明智实施至关重要。
Salt marshes are globally distributed, vegetated intertidal wetlands and marsh edge erosion is common on many shores. To understand how and why marsh edge erosion occurs, the response of salt marsh substrates to applied shear and vertical stress must first be quantified. This response is likely influenced by marsh substrate biological, geochemical and sedimentological composition. However, currently there is little systematic research into the between‐marsh variability in these properties and how they affect both marsh edge erosion processes and the ability of a marsh to maintain its position vertically within the tidal frame.This paper compares two marshes of contrasting sedimentology at Tillingham marsh, East England and Warton marsh, Northwest England. Soil shear strength and compressibility are determined by applying geotechnical methods to determine marsh resistance to shear and vertical effective stresses. This research was able to isolate the influence of roots on substrate shear strength in a three‐dimensional sample. In response to vertical effective stress, both the expected displacement magnitude and the vertical recovery potential of a marsh substrate are affected by past stress conditions on the marsh, particularly those resulting from desiccation. The substrate response to vertical effective stress also influences substrate shear strength through the effect of consolidation on the void ratio (or bulk density).We present evidence for the connection between marsh composition and substrate behaviour under applied stress. The results shed light on potential determinants of marsh resistance to edge erosion, which is ultimately essential for the informed implementation of both nature‐based coastal flood defences and coastal restoration schemes.
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DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
J. Allen
通讯作者：
J. Allen
影响因子：
3.3
作者：
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通讯作者：
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影响因子：
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作者：
I. Möller;T. Spencer
通讯作者：
I. Möller;T. Spencer
影响因子：
3.3
作者：
A. Pringle
通讯作者：
A. Pringle
影响因子：
2.8
作者：
M. Brain;A. Long;D. Petley;B. Horton;R. Allison
通讯作者：
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