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首页> 外文期刊>Estuarine Coastal and Shelf Science >Measuring sediment deposition and accretion on anthropogenic marshland - Part II: The adaptation capacity of the North Frisian Halligen to sea level rise
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Measuring sediment deposition and accretion on anthropogenic marshland - Part II: The adaptation capacity of the North Frisian Halligen to sea level rise

机译：测量人为沼泽地上的沉积物沉积和吸积-第二部分：北弗里斯兰哈利根对海平面上升的适应能力

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Low coastlands, marshlands and islands all over the world are challenged by rising water levels due to climatic changes. The adaptation capacity of such lowlands is based on frequent inundations and according sedimentation processes. Exemplarily, a system of small islands west of Northern Germany was investigated over three years. At three out of ten so-called Halligen located in the Wadden Sea, the adaptation capacity of the anthropogenic marshland was determined. The Halligen Hooge, Langeness and Nordstrandischmoor have surface elevations only a few decimetres above mean high water and have to cope with an inundation frequency of nowadays up to 22 times per year. By use of methods introduced in Schindler et al. (2014, this volume) in combination with a Cs-137 and Pb-210 dating campaign on 12 sediment cores, vertical accretion rates were measured and detailed sediment accretion patterns presented. A good agreement was found between the used methods to calculate long term and short term marshland accretion rates. Sediment deposition and vertical marshland accretion is mainly controlled by the high tide events (single storm surges). Coastal protection structures, established in the early 20th century, decrease the inundation frequency and hinder the efficiency of the sediment transport by the tidal channel system on the Halligen. Vertical marshland accretion based on 210Pb dating for the time span 1915-2011 (1.0 +/- 0.3 mm/a, Hooge, 1.2 +/- 0.3 mm/a, Langeness and 2.6 +/- 0.9 mm/a, Nordstrandischmoor) is in disequilibrium with the fast increasing mean high water level (MHW, 5.0 +/- 0.3 mm/a). Projections until 2100 revealed that the extreme values (highest high waters, HHW) tend to rise much faster than the MHW or relative mean sea level (RMSL). Therefore an increasing hazard potential for the Halligen has to be expected if vertical marshland accretion does not accelerate in the future. (C) 2014 Elsevier Ltd. All rights reserved.
机译：由于气候变化，世界各地的低沿海地区，沼泽地和岛屿都面临着水位上升的挑战。这种低地的适应能力是基于频繁的洪水和相应的沉积过程。示例性地，对德国北部西部的一个小岛进行了三年的调查。在位于瓦登海的十个所谓的哈利根中，有三分之二被确定为人为沼泽地的适应能力。 Halligen Hooge，Langeness和Nordstrandischmoor的地表高程仅比平均高水高出几分之一米，如今必须应对每年多达22次的淹没频度。通过使用Schindler等人介绍的方法。 （2014年，此卷）结合对12个沉积物岩心的Cs-137和Pb-210测年运动，测量了垂直吸积率，并给出了详细的沉积物吸积模式。在计算长期和短期沼泽地增生率的方法之间发现了很好的一致性。沉积物沉积和垂直沼泽地增生主要受潮汐事件（单次风暴潮）的控制。始建于20世纪初的海岸保护结构降低了淹没频率，并阻碍了哈利根（Halligen）潮汐通道系统的泥沙输送效率。在1915-2011年间基于210Pb的垂直沼泽地增生（1.0 +/- 0.3毫米/年，Hooge，1.2 +/- 0.3毫米/年，Langeness和2.6 +/- 0.9毫米/年，Nordstrandischmoor）快速增加的平均高水位（MHW，5.0 +/- 0.3 mm / a）。直到2100年的预测表明，极端值（最高水位，HHW）的上升趋势往往比MHW或相对平均海平面（RMSL）快得多。因此，如果垂直沼泽地的积聚将来不会加速，那么哈里根的潜在危险就必须增加。 （C）2014 Elsevier Ltd.保留所有权利。

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