寒潮过程中长兴岛近岸水体后向声散射观测研究  

Observation of Acoustic Backscatter in Water Column During Cold Surge in Changxingdao Coastal Water

作　　者：杨壮春 杨光兵 王红 陈亮 YANG Zhuang-chun;YANG Guang-bing;WANG Hong;CHEN Liang(CNOOC Deepwater Exploitation Co. Ltd.,Shenzhen 518064,China;First Institute of Oceanography,MNR,Qingdao 266061,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot Qingdao National Laboratory for Marine Science and Technology (Qingdao),Qingdao 266237,China;College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中海石油深海开发有限公司,广东深圳518064 [2]自然资源部第一海洋研究所,山东青岛266061 [3]青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室,山东青岛266237 [4]中国海洋大学海洋与大气学院,山东青岛266100

出　　处：《海洋科学进展》2019年第1期22-31,共10页Advances in Marine Science

基　　金：国家科技重大专项项目--大型油气田及煤层气开发-南海荔湾气田群和流花油田群开发示范工程(2016ZX05057);中央级公益科研院所基本科研业务费专项资金资助项目--海底浅表层底质温度剖面和声速连续观测技术研究和应用(2017Q01);国家自然科学基金项目--天气过程中底层水温变化对浅表层底质影响的观测研究(41706038);山东省自然科学基金项目--海底浅表层底质温度剖面和声速连续观测系统研究(ZR2017QD005)

摘　　要：2018-01-17—03-11,在大连长兴岛附近海域开展了为期54d的水文和气象连续现场观测,获取了风速、气温、海流、波浪、海冰、以及水体回声强度等多要素观测数据。数据显示观测期间经历了2次完整的大风降温天气过程(寒潮),并且在降温后出现了显著的冰情。通过将回声强度数据转化为后向声散射强度,用后向声散射强度数据表征水体悬浮物浓度变化,利用EMD方法分解了后向声散射强度数据,分析了潮流和波浪在海面是否结冰情况下对沉积物再悬浮的影响。结果显示:海面结冰对潮流引起的海底沉积物再悬浮没有明显影响,但海冰却能通过抑制波浪来减弱沉积物的再悬浮。A 54-day (January 17 to March 11, 2018) continuous in-situ hydrological and meteorological observation was conducted in coastal region of Changxingdao, Dalian, and wind speed, air temperature, current, wave, sea ice, and echo intensity were measured. Observation shows that two cold surges happened during the observation and sea ice was observed after the cold surges. The echo intensity was converted to backscatter strength to represent sediment concentration, and the backscatter strength was further decomposed with the EMD to analyze the effects of wave and tidal current on sediment resuspension with and without sea ice. Results show that the sec ice has little influence on the tidal current-induced sediment resuspension, but does weaken the sediment resuspension induced by waves.

关 键 词：再悬浮 海冰 寒潮 波浪 潮流 

分 类 号：P731[天文地球—海洋科学]