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Swash zone sediment fluxes: Field observations

机译：冲积带泥沙通量：现场观察

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摘要

This paper describes newly obtained, high-frequency observations of beach face morphological change over numerous tidal cycles on a macrotidal sandy beach made using a large array of ultrasonic altimeters. These measurements enable the net cross-shore sediment fluxes associated with many thousands of individual swash events to be quantified. It is revealed that regardless of the direction of net morphological change on a tidal time scale, measured net fluxes per event are essentially normally distributed, with nearly equal numbers of onshore and offshore-directed events. The majority of swash events cause net cross-shore sediment fluxes smaller than ± 50 kg m~(-1) and the mean sediment flux per swash event is only 0( ± 1 kg m~(-1)) leading to limited overall morphological change. However, much larger events which deposit or remove hundreds of kilograms of sand per meter width of beach occur at irregular intervals throughout the course of a tide. It was found that swash-swash interactions tend to increase the transport potential of a swash event and the majority of the swash events that cause these larger values of sediment flux include one or more interactions. The majority of the larger sediment fluxes were therefore measured in the lower swash zone, close to the surf/ swash boundary where swash-swash interactions are most common. Despite the existence of individual swash events that can cause fluxes of sediment that are comparable to those observed on a tidal time scale, frequent reversals in transport direction act to limit net transport such that the beach face volume remains in a state of dynamic equilibrium and does not rapidly erode or accrete.
机译：本文介绍了使用大型超声波高度计制成的巨潮沙滩上，在多个潮汐周期内海滩面形态变化的最新高频观测结果。这些测量结果可以量化与成千上万的单个冲积事件相关的跨岸净沉积物通量。结果表明，不管潮汐时间尺度上净形态变化的方向如何，每个事件测得的净通量基本上是正态分布的，陆上和海上定向事件的数量几乎相等。大部分冲刷事件导致净跨海岸沉积物通量小于±50 kg m〜（-1），每个冲刷事件的平均沉积物通量仅为0（±1 kg m〜（-1）），导致总体形态有限更改。但是，在潮汐的整个过程中，每米宽的海滩会沉积或清除数百公斤沙子的较大事件以不规则的间隔发生。已发现，冲刷-冲刷相互作用往往会增加冲刷事件的运输潜力，并且导致这些较大的沉积物通量值的大多数冲刷事件都包括一个或多个相互作用。因此，大部分较大的沉积物通量是在较低的斜流带（靠近斜流与斜流相互作用最常见的冲浪/斜流边界）处测量的。尽管存在单独的冲刷事件，这些事件可能导致与潮汐时间尺度上观察到的泥沙通量相当，但频繁的运输方向逆转会限制净运输，从而使海滩的面容保持动态平衡，并且不会迅速侵蚀或积聚。

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  • 来源
    《Coastal engineering》 |2011年第1期|p.28-44|共17页
  • 作者

    C.E. Blenkinsopp; I.L Turner; G. Masselink; P.E. Russell;

  • 作者单位

    Water Research Laboratory, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia;

    Water Research Laboratory, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia;

    School of Marine Science and Engineering, University of Plymouth, Plymouth, PL4 8A4, UK;

    School of Marine Science and Engineering, University of Plymouth, Plymouth, PL4 8A4, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    swash; sediment transport; uprush; backwash; beach face bed-levels;

    机译：冲刷泥沙输送;高潮反洗海滩面床位;

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