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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A method to estimate the longshore sediment transport at ebb-tidal deltas based on their volumetric growth: Application to the Guadiana (Spain-Portugal border)
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A method to estimate the longshore sediment transport at ebb-tidal deltas based on their volumetric growth: Application to the Guadiana (Spain-Portugal border)

机译：基于其体积增长的延缓沉积物运输的方法：对瓜迪亚纳（西班牙 - 葡萄牙边境）的应用

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摘要

Current techniques assessing longshore sediment transport rates have large uncertainties, pleading for the development of alternative and complementary approaches. The present study proposes a method to estimate the decadal average rate of longshore transport at modern ebb-tidal deltas based on a sediment budget analysis of the outer shoal growth. This transport is obtained as the balance of the other contributions to the shoal with the total sediment input rate obtained from an inverse application of the inlet reservoir model. The method is applied to the Guadiana ebb-tidal delta, yielding an average longshore sediment transport rate (~85 000 m3 year(-1)) in good agreement with expectations for the region. It is exemplified that this decadal averaged rate can be used to improve longshore sediment transport expressions in order to study its variability over shorter time scales. At the Guadiana, the yearly longshore sediment transport from the improved formula ranges from ~25 000 m(3) (westward) to ~245 000 m(3) (eastward) and is related to the North Atlantic Oscillation index. Overall, the proposed method constitutes an alternative tool to constrain the average longshore sediment transport rate over decades in the vicinity of tidal inlets. It is applicable to ebb-tidal deltas where the outer shoal growth (from an early to a mature stage) is well documented by bathymetric maps, and where the main transport pathways towards the outer shoal can be specified. (c) 2019 John Wiley & Sons, Ltd. (c) 2019 John Wiley & Sons, Ltd.
机译：评估龙岸沉积物运输率的目前的技术具有很大的不确定性，恳求开发替代和互补方法。本研究提出了一种基于外部浅层生长的沉积物预算分析，提出了一种估算现代EBB-TIDAL Deltas的龙底运输二道平均速率的方法。获得该运输作为浅滩的其他贡献的平衡，其具有从入口储存模型的逆应用获得的总沉积物输入速率。该方法适用于瓜迪亚纳潮潮三角洲，良好的龙头沉积物运输速率（〜85 000 m3年（-1）），与该地区的期望良好。举例说明，这种Decadal平均率可用于改善漫长的沉积物传输表达式，以便在较短的时间尺度上研究其变化。在瓜迪亚纳，从改进的公式到〜25000米（3）（向西）到〜245 000米（3）（东部）的年度龙岸沉积物运输，并与北大西洋振荡指数有关。总的来说，该方法构成了一个替代工具，以限制潮汐入口附近的数十年的龙头沉积物运输速率。它适用于EBB-TIDAL DELTA，其中外部浅滩生长（从早期到成熟阶段）通过碱基图谱良好地记录，并且可以指定朝向外部浅滩的主要运输路径。 （c）2019 John Wiley＆Sons，Ltd。（c）2019 John Wiley＆Sons，Ltd。

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