摘要
潮流和风浪是浅海底边界层沉积物再悬浮和垂向输运的主要动力,对底剪切应力和悬浮物浓度有显著影响。本文基于2018年2月23日~3月2日在山东半岛东侧进行的一次原位座底连续观测,利用高频点式流速仪(ADV)和浊度计(RBR-TU)的观测结果定量研究了潮流和风浪对底剪切应力和悬浮物浓度的影响。结果表明:在弱风浪情况下,底剪切应力跟潮流流速的平方显著相关。但是在强风浪海况下(有效波高大于1 m),底剪切应力受控于风浪的影响。潮流通过平流输运作用和局地再悬浮作用影响悬浮物浓度分布,而波浪主要通过局地再悬浮影响悬浮物浓度。定量研究潮流和风浪对底边界层剪切应力和悬浮物浓度的影响有助于认识沉积动力过程,进而优化目前沉积物输运模型中的参数化方案,达到定量预测沉积物输运过程的目的。
Tidal currents and wind waves are the dominant driving forces for sediment resuspension and transport in the bottom boundary layer of shallow seas.Based on an in-situ dataset collected off the Shandong Peninsula from February 23 to March 2,2018,the effects of tidal currents and wind waves on bottom shear stress and suspended sediment concentration were quantitatively studied.Under weak wave conditions,the bottom shear stress is significantly correlated with the square of tidal current speed.As surface waves grow bigger(significant wave height is greater than 1 meter),the bottom shear stress is mainly controlled by the waves.Tidal currents contribute to the variation of suspended sediment concentration through lateral advection and/or local resuspension,while wind waves mainly cause the local resuspension.This quantitative study is deemed to help understanding the sedimentary dynamic process of the bottom boundary layer by optimizing parameterization schemes in sediment transport models.
作者
赵盖博
边昌伟
徐景平
ZHAO Gai-Bo;BIAN Chang-Wei;XU Jing-Ping(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Physical Oceanography Laboratory,Ocean University of China,Qingdao 266100,China;Department of Marine Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Pilot National Laboratory of Marine Science and Technology(Qingdao)Laboratory for Marine Geology and Environment,Qingdao 266000,China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第11期83-91,共9页
Periodical of Ocean University of China
基金
国家自然科学基金项目(41476070
41530966
41606015)资助~~
关键词
潮流
风浪
底剪切应力
悬浮物浓度
tidal current
wind wave
bottom shear stress
suspended matter concentration
作者简介
赵盖博(1993-),男,硕士生,研究方向为沉积动力学。E-mail:gb_zhao@126.com;通讯作者:徐景平,E-mail:xujp@sustc.edu.cn。
