...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Multi-scale morphodynamics of an estuarine beach adjacent to a flood-tide delta: Assessing decadal scale erosion
【24h】

Multi-scale morphodynamics of an estuarine beach adjacent to a flood-tide delta: Assessing decadal scale erosion

机译：邻近洪水潮三角洲的河口海滩的多尺度形态学性质：评估截止额度腐蚀

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Estuarine beaches are ubiquitous, yet understudied, coastal systems. The mixed hydrodynamic processes - such as combined tidal and wave forcing - and the influence of adjacent sedimentary features - such as flood-tide deltas (FTDs) - leads to complex morphodynamic processes. As such, the dynamics and evolution of these important coastal systems are poorly understood. This study synthesises a set of analyses conducted on an estuarine beach, in southeast Australia, over multiple temporal scales. Nearshore waves and currents were measured and used to determine the processes driving seasonal to yearly beach change between 2007 and 2010. These results were compared to decadal scale beach change determined from aerial photos between 1963 and 2006. We found the westward transport of sediment towards the inner estuary was the dominant nearshore process leading to erosion in the eastern regions of the beach (near the estuary entrance) and accretion in the west over yearly time scales. Cross-shore sediment transport occurred during winter storm swell conditions leading to erosion in more exposed sites and some limited accretion in sheltered zones, most likely due to sediment input from the flood-tide delta. However, severe storm swell events that propagated into the estuary led to a loss of sediment and erosion across the entire beach which was not recovered during the study period. It is likely that the erosion processes observed in the short- to medium-term (days to years) analyses are the conditions that led to the long-term shoreline retreat observed in the aerial photograph record. The long-term shoreline retreat since 1963 is likely a result of a negative sediment balance due to movement of the FTD and a lack of sediment input in the eastern regions of Shoal Bay. Shoreline retreat will likely continue unless increased sediment input occurs from marine sources or shoreline interventions are maintained.
机译：河口海滩普遍存在，尚未深入的沿海系统。混合的流体动力学方法 - 例如组合潮汐和波迫使 - 以及相邻沉积特征的影响 - 例如洪水δ（FTDS） - 导致复杂的形态学过程。因此，这些重要的沿海系统的动态和演化都很清楚。本研究综合了一系列在澳大利亚东南部的河口海滩上进行的分析，超过多个时间尺度。测量了近岸波浪和电流，并用于确定2007年至2010年间驾驶季节性到年海滩变化的过程。这些结果与1963年和2006年之间的航空照片中厘定的二等尺度海滩变化进行了比较。我们发现向西向西运输沉积物内部河口是占主导地位的近岸进程，导致海滩东部地区（近河入口处）和西部的遭受的侵蚀，每年的时间尺度。冬季风暴期间发生跨海岸沉积物运输，导致更暴露的位置侵蚀的条件以及庇护区的一些有限的吸引力，很可能是由于洪水潮三角洲的沉积物输入。然而，严重的风暴膨胀事件蔓延到河口导致整个海滩的沉积物和侵蚀丧失，在研究期间没有恢复。在短至中期（日期到几年）分析中观察到的侵蚀过程可能是导致在航空照片记录中观察到的长期海岸线撤退的条件。自1963年以来的长期海岸线撤退可能导致由于FTD的运动和浅滩区域的浅滩区域的缺乏沉积物引起的负面沉积平衡。除非维持从海洋来源或海岸线干预发生的增加的沉积物输入，否则海岸线撤退可能会继续。

著录项

  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第31期|106759.1-106759.12|共12页
  • 作者

    Harris Daniel L.; Vila-Concejo Ana; Austin Timothy; Benavente Javier;

  • 作者单位

    Univ Queensland Sch Earth & Environm Sci Brisbane Qld 4072 Australia|Univ Queensland Remote Sensing Res Ctr Brisbane Qld 4072 Australia;

    Univ Sydney Sch Geosci Geocoastal Res Grp Sydney NSW 2006 Australia;

    Univ New South Wales UNSW Sch Math & Stat Coastal & Reg Oceanog Lab Sydney NSW 2052 Australia;

    Univ Cadiz Fac Marine & Environm Sci Dept Earth Sci Cadiz 11510 Spain;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号