• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Sediment transport in a dynamic, tidally-influenced coastal embayment exemplified by Pleasant Bay and Chatham Harbor, Cape Cod, Massachusetts.
【24h】

Sediment transport in a dynamic, tidally-influenced coastal embayment exemplified by Pleasant Bay and Chatham Harbor, Cape Cod, Massachusetts.

机译：受到潮汐影响的动态沿海污染物中的泥沙运输，例如马萨诸塞州科德角的宜人海湾和查塔姆港。

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

Sediment transport in a coastal embayment was documented on multiple spatial and temporal scales. An inlet formed in Chatham Harbor in 1987 and as a result the primary flood-tidal delta began to migrate. The relationship between the evolution of the tidal inlet and the flood-tidal delta was documented using field studies and spatial analyses of georeferenced aerial photographs. A feedback mechanism was documented such that the migrating flood-tidal delta increases in surface area, which causes the ebb-tidal flow to become more channelized, which in turn allows more intertidal area to be created by flood-tidal currents and further channelizing ebb-tidal flow. As a result of this cycle two outcomes can be reached. First, the flood-tidal delta restricts ebb-tidal flow to such an extent that a new inlet is formed through the barrier during a storm event. Second, ebb-tidal flow creates channels in the flood-tidal delta, decreasing the surface area of the flood-tidal delta and restarts the cycle.;In April 2007 a new inlet formed through Nauset Beach, a barrier spit within the boundaries of Cape Cod National Seashore. This inlet formed during an extratropical storm as did the 1987 inlet. However, the 2007 inlet did not form as a result of increasing hydraulic inefficiency due to spit elongation. The restriction and redirection of the main tidal channel in the central part of the harbor gave rise to conditions that led to the 2007 inlet formation. The placement of dredged material within Chatham Harbor also contributed to that restriction and redirection.;A new shoreline proxy for calculating shoreline change in the Pleasant Bay-Chatham Harbor coastal lagoon was developed and tested. Shoreline change not discernible using a traditional shoreline proxy was documented using this new proxy along shorelines with fringing salt marsh. This method can track low-energy sediment transport that over time can have dramatic impacts to, and implications for shoreline change, water quality issues, predator-prey relationships and overall ecosystem health. Salt marshes are among the world's most biologically productive ecosystems and these findings will improve our understanding and management of these areas.
机译：在多个时空尺度上记录了沿海岸带的泥沙运移。 1987年在查塔姆港形成一个进口，结果，主要的洪潮三角洲开始迁移。通过实地研究和地理参考航空照片的空间分析，记录了潮汐进口演变与潮汐三角洲之间的关系。反馈机制被记录下来，使得迁移的潮汐三角洲的表面积增加，这导致潮汐流变得更加通道化，这反过来又允许潮汐流产生更多的潮间带面积，并进一步通道化退潮。潮流。作为该周期的结果，可以达到两个结果。首先，潮汐洪流三角洲将潮汐流限制在一定程度，以至于在暴风雨期间通过屏障形成新的入口。其次，潮汐流在潮汐三角洲中形成通道，减小了潮汐三角洲的表面积并重新启动了循环。； 2007年4月，通过Nauset海滩形成了一个新的进水口，这是开普省边界内的障碍物鳕鱼国家海滨。该入口与1987年的入口一样在温带风暴中形成。但是，2007年的进水口并未形成，原因是由于吐水口伸长而导致水力效率低下。港口中部主要潮汐通道的限制和改道导致了导致2007年进水口形成的条件。查塔姆港内疏of材料的放置也对限制和改道做出了贡献。开发了一个用于计算宜人湾-查塔姆港沿海泻湖中海岸线变化的新海岸线代理。使用此新代理记录了沿海岸线的边缘盐沼，使用传统海岸线代理无法识别出海岸线变化。这种方法可以跟踪低能沉积物的运输，随着时间的流逝，低能沉积物会对海岸线变化，水质问题，食肉动物与猎物的关系以及整体生态系统健康产生重大影响，并产生影响。盐沼是世界上生物生产力最高的生态系统之一，这些发现将增进我们对这些地区的了解和管理。

著录项

  • 作者

    Borrelli, Mark.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Geology.;Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;海洋物理学;
  • 关键词

  • 入库时间 2022-08-17 11:39:10

相似文献

  • 外文文献
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