• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Wave energy and clast transport in eastern Tasman Bay, New Zealand
【24h】

Wave energy and clast transport in eastern Tasman Bay, New Zealand

机译：新西兰塔斯曼湾东部的波浪能和碎石运输

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

Coarse-gravel beaches are common features along the eastern margin of Tasman Bay, at the north end of South Island, New Zealand. Although these features have traditionally been interpreted as spits, contemporary incident wave energy appears too small to transport boulders and cobbles persistently along the beaches and platforms by longshore drift. An alternative explanation suggests that boulder beaches are essentially derived in situ from resistant bedrock, which lies seaward and was buried by gravel during the Holocene sea level rise. Wind, wave and clast size data from Cable Bay and the Nelson Boulder Bank were used to resolve this problem. Wave and wind data indicate that waves reaching these areas are derived locally in Tasman Bay, and are limited in size and energy. Hindcasting predicts a 4(.)7 m wave could propagate from Tasman Bay. However, during Cyclone Yalli, the most intense storm in nearly 40 years of wind records, the largest wave measured in the nearby area of Cable Bay was only 2(.)7 m high. Maximum orbital velocity on the seabed beneath a 4(.)7 m is calculated to be 2(.)9 m s(-1), which cannot initiate transport of clasts greater than 0(.)15 m in diameter. Clasts on the gravel platforms have average diameters greater than this, but some clasts may be as large as 1(.)0 m in diameter. By comparison, a swash run-up method predicts that a wave 4(.)7 m high can transport clasts no larger than 0(.)3 m in diameter. These data and approximate calculations strongly suggest that the present wave environment in eastern Tasman Bay is not capable of consistently transporting clasts on the boulder platforms by longshore drift. Reduced sea levels in the pre-Holocene period would further reduce wave energies available in Tasman Bay. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：在新西兰南岛北端的塔斯曼湾东缘，粗砾石滩是常见的特征。尽管传统上将这些特征解释为“喷口”，但现代入射波能量似乎太小，无法通过长岸漂流沿海滩和平台持续运送巨石和卵石。另一种解释认为，巨石滩基本上是从抗性基岩原位获得的，该基岩位于海中，并在全新世海平面上升期间被砾石掩埋。来自Cable Bay和Nelson Boulder Bank的风，浪和碎屑尺寸数据用于解决此问题。海浪和风的数据表明，到达这些区域的海浪是在塔斯曼湾本地产生的，其大小和能量受到限制。 Hindcasting预测可能会从塔斯曼湾传播出4（。）7 m的波浪。然而，在近40年来最大的强风暴飓风“雅利”期间，在电缆湾附近测得的最大海浪只有2（。）7 m高。在4（。）7 m以下海床上的最大轨道速度经计算为2（。）9 m s（-1），这无法启动直径大于0（。）15 m的岩屑的运输。碎石平台上的碎屑的平均直径大于此值，但某些碎屑的直径可能高达1（。）0 m。相比之下，斜​​波上升法预测，高4（。）7 m的波浪可以传输直径不大于0（。）3 m的碎石。这些数据和近似计算强烈表明，塔斯曼湾东部目前的波浪环境无法通过长岸漂流持续在巨石平台上运送碎屑。全新世前时期海平面的下降将进一步减少塔斯曼湾可用的波浪能。版权所有（c）2006 John Wiley＆Sons，Ltd.

著录项

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