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首页> 外文期刊>The Science of the Total Environment >Integration of shelf evolution and river basin models to simulate Holocene sediment dynamics of the Humber Estuary during periods of sea-level change and variations in catchment sediment supply
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Integration of shelf evolution and river basin models to simulate Holocene sediment dynamics of the Humber Estuary during periods of sea-level change and variations in catchment sediment supply

机译：整合架子演化和流域模型以模拟海伯河口全新世沉积物在海平面变化和集水区沉积物供应变化期间的动力学

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摘要

Three modelling elements and sedimentary evidence provide an understanding of sediment characteristics, river basin processes, tidal regimes and sea-level changes to explain sediment supply to the Humber Estuary through the Holocene (the last 10 000 years). An upscaled cellular catchment model simulates water and sediment fluxes from river basins, illustrating significant variations in response to climate change, especially precipitation and vegetation changes, principally deforestation. Much of the sediment mobilised remains in stores within the catchment and only a small fraction reaches the Humber tidal system. An empirical model helps to explain sediment erosion, transport and deposition from the offshore and coastal zones through the Holocene and sea-level rise caused the transgression of the continental shelf of the North Sea. Comparison with the sediment fill of the lowlands around of the Humber estuary, that represent the extent of the estuary during the Holocene, demonstrates that most of the fill (～95-98%) was derived from non-fluvial sources. A shelf evolution model, with reconstructions of sea level, palaeogeography and palaeobathymetry for 1000 year time steps through the Holocene predicts significant changes in tidal regimes, first over wide areas of the coast as the transgression of the continental shelf progresses. The most significant changes occur with the inner reaches of the palaeo-estuaries, especially those of the Humber and the Fenland. Throughout the mid-Holocene they are characterised by significantly lower tidal ranges (MWHST ～2.5 m less than present) and low tidal currents. The simulated patterns of tidal currents concur with the transport of fine grain sediment from the coastal zone into the estuaries. The major tidal range changes revise estimates of late Holocene and ongoing relative sea and land level changes.
机译：三个建模元素和沉积证据提供了对沉积物特征，流域过程，潮汐机制和海平面变化的理解，以解释通过全新世（最近一万年）向亨伯河口的沉积物供应。高档的蜂窝状流域模型模拟了流域的水和泥沙通量，显示了对气候变化（尤其是降水和植被变化，主要是森林砍伐）的显着变化。动员的大部分沉积物仍保留在流域内的存储中，只有一小部分到达了亨伯潮汐系统。一个经验模型有助于解释通过全新世和海平面上升引起北海大陆架海侵的近海和沿海地区的沉积物侵蚀，运输和沉积。与代表整个全新世期间河口范围的亨伯河口周围低地的沉积物充填进行比较，结果表明，大部分充填物（〜95-98％）来自非河流来源。陆架演化模型，包括通过全新世重建1000年的海平面，古地理学和古生物测量学，可以预测潮汐状态的重大变化，首先是随着大陆架海侵的发展，在沿海的广大地区。最显着的变化发生在古河口的内部，特别是亨伯河和芬兰河的内部。在整个全新世中期，它们的特征是潮汐范围明显较低（MWHST比现在少2.5m）和潮汐流低。潮流的模拟模式与细粒沉积物从沿海地区到河口的运输是一致的。主要的潮差变化修订了全新世晚期以及正在进行的相对海平面和陆平面变化的估计。

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