Geological impacts on coastal wetland landscapes: some general effects of sediment autocompaction in the Holocene of northwest Europe
Geological impacts on coastal wetland landscapes: some general effects of sediment autocompaction in the Holocene of northwest Europe
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对沿海湿地景观的地质影响：欧洲西北部全新世沉积物自动压实的一些一般影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Allen
中科院分区：
文献类型：
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作者：
J. Allen
描述了一个模拟模型，它提供了对海岸泥滩和沼泽上不平坦的基底上形成的地层层序中自压实效应的一般见解。岩性单位和埋藏的地貌逐渐移位和扭曲，合成层序类似于欧洲西北部全新世描述的层理几何形状。自动压实还会促进局部沉积速率，这可能会大大超过创建可容纳空间的速率。由于下伏泥炭的高可压缩性，海侵粉砂与特别大的沉积速率有关。海平面表观上升速率和海床厚度之间的实验关系类似于全新世的经验趋势。然而，后者被模型中未包括的与岩性有关的“内在”效应所强化。
A simulation model is described providing general insights into autocompaction effects in stratigraphic sequences formed on coastal mudflats and marshes over uneven basements. Lithological units and buried landscapes are progressively displaced and distorted, the synthetic sequences resembling bedding geometries described from the northwest European Holocene. Autocompaction also promotes local deposition rates that may greatly exceed the rates at which accommodation space is created. Transgressive silts are associated with especially large deposition rates, because of the high compressibility of underlying peats. The experimental relationships between apparent rates of sea-level rise and bed thickness resemble empirical trends for the Holocene. The latter are, however, reinforced by an ‘intrinsic’, lithology-related effect not included in the model.