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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Form drag is a major component of bed shear stress associated with tidal flow in the vicinity of an isolated sand bank, Torres Strait, northern Australia
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Form drag is a major component of bed shear stress associated with tidal flow in the vicinity of an isolated sand bank, Torres Strait, northern Australia

机译：形变阻力是与孤立的沙洲附近的潮汐流相关的床剪应力的主要组成部分，澳大利亚北部的托雷斯海峡

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摘要

Tidal current and elevation data were collected from five oceanographic moorings during October 2004 in Torres Strait, northern Australia, to assess the effects of large bedforms (i.e., sand banks) on the drag coefficient (CD) used for estimating bed shear stress in complex shallow shelf environments. Ten minute averages of tidal current speed and elevation data were collected for 18 days at an on-bank site ( < 7 m water depth) and an off-bank site (< 10 m). These data were compared to data collected simultaneously from two shelf locations (< 11 m) occupied to measure regional tidal behaviour. Overall C-D estimates at the on- and off-bank sites attained 7.0 +/- 0.1 x 10(-3) and 6.6 +/- 0.1 x 10(-3), respectively. On-bank C-D estimates also differed between the predominant east-west tidal streams, with easterly directed flows experiencing CD =7.8 +/- 0.18 x 10(-3) and westerly directed flows C-D=6.4 +/- 0.12 x 10(-3). Statistically significant differences between the off-bank and on-bank sites are attributed to the large form drag exerted by the sand banks on the regional tidal currents, and statistically significant differences between the westward and eastward flows is ascribed to bedform asymmetry. Form drag from the large bedforms in Torres Strait comprises up to 65% of the total drag coefficient. When constructing sediment transport models, different C-D estimates must therefore be applied to shelf regions containing steep bedforms compared to regions that do not. Our results extend the limited inventory of seabed drag coefficients for shallow shelf environments, and can be used to improve existing regional seabed mobilisation models, which have direct application to environmental management in Torres Strait. Crown Copyright (c) 2008 Published by Elsevier Ltd. All rights reserved.
机译：2004年10月，在澳大利亚北部的托雷斯海峡，从五个海洋系泊设备上收集了潮汐流和高程数据，以评估大型床形（即，沙岸）对用于估算复杂浅层中床层剪应力的阻力系数（CD）的影响。货架环境。在岸上地点（水深<7 m）和岸外地点（<10 m）收集了18天的平均十分钟潮流速度和潮汐数据。将这些数据与从两个被用来测量区域性潮汐行为的架子位置（<11 m）同时收集的数据进行比较。在银行内和银行外站点的总体C-D估计分别达到7.0 +/- 0.1 x 10（-3）和6.6 +/- 0.1 x 10（-3）。在主要的东西向潮汐流之间，银行对CD的估计也有所不同，东向气流的CD = 7.8 +/- 0.18 x 10（-3），西风引导的CD = 6.4 +/- 0.12 x 10（-3） ）。岸外和岸上站点之间的统计显着差异归因于沙岸在区域潮流上施加的大形式阻力，而西向和东向流之间的统计上显着差异归因于床形不对称。托雷斯海峡大床形的形式阻力高达总阻力系数的65％。因此，在构建沉积物输运模型时，与没有陡峭床形的架子区域相比，必须将不同的C-D估计应用于架子区域。我们的研究结果扩展了浅层架环境下有限的海底阻力系数清单，可用于改进现有的区域海底动员模型，这些模型已直接应用于托雷斯海峡的环境管理。 Crown版权所有（c）2008，由Elsevier Ltd.发行。保留所有权利。

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