南海三维温盐结构对海水透明度的影响分析  

Effect of Three-Dimensional Temperature and Salinity Structure on Secci Disk Depth in South China Sea

作　　者：邓美环 郝增周[1,2] 龚芳[1,2] 陶邦一[1,2] 何贤强[1,2] DENG Mei-huan;HAO Zeng-zhou;GONG Fang;TAO Bang-yi;HE Xian-qiang(State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China)

机构地区：[1]卫星海洋环境动力学国家重点实验室,浙江杭州310012 [2]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《水下无人系统学报》2018年第6期596-604,共9页Journal of Unmanned Undersea Systems

基　　金：国家重点研发计划资助(2016YFC1400203);中央级公益性科研院所基本科研业务专项资金资助项目(JT1503)

摘　　要：无人水下航行器(UUV)试验作业、航行深度和航路选择等活动受海流、透明度、跃层、海水温度和盐度等海洋复杂水文环境的影响。研究结合卫星遥感和数值模式数据,从信息流的角度分析了南海海域三维温盐结构对海水透明度(SDD)的影响及区域分布特征,规避了在传统相关性分析中无法准确描述变量间因果影响关系的不足。结果表明,因受高温低盐海域叶绿素浓度较高的影响,表层盐度较低的中沙群岛及近岸海域,其SDD主要受浅层海水盐度的影响;表层高温低盐的南沙群岛附近海域SDD主要受20～30m深处的海水温度影响;表层高温高盐的西沙群岛附近海域SDD主要受60～70m深处的海水温度和盐度影响;由于受温度锋面和悬浮泥沙的影响,吕宋海峡附近海域SDD主要受30～50 m深处海水温度的影响。水下三维海水温度和盐度的变化影响甚至会加剧SDD的变化,因此建议UUV在航行和试验作业时应尽量选择最大SDD深度以下,同时避开水下三维海水温度和盐度对SDD影响较大的深度,以保证UUV航行的安全、可靠和隐蔽性。The experiment,navigation depth and sea route of an Unmanned Undersea Vehicle(UUV)are affected by ocean current,transparency,spring layer,seawater temperature and salinity,as well as other complex hydrological environments.Based on the information flow concept,this paper investigates the cause-effect relation between the three-dimensional temperature and salinity structure and the Secci Disk Depth(SDD)by using the data of satellite remote sensing and numerical model in South China Sea,which avoids the disadvantage of the traditional correlation analysis that the causal relationship among variables cannot be accurately described.The results show that:1)The SDD in the area around the Zhongsha Islands and offshore with lower salinity is mainly affected by the salinity of the shallow sea water because the chlorophyll concentrations are high in the seawater with higher temperature and lower salinity;2)Seawater of the area around the Nansha Islands with high temperature and low salinity,so the SDD mainly affected by the temperature of the seawater at a depth of20-30meters;3)The SDD in the area around the Xisha Islands with higher temperature and salinity is mainly affected by the temperature and salinity of the seawater at a depth of60-70meters;and4)Due to the influences of temperature front and suspended sediment,the SDD around Luzon strait is mainly affected by the temperature of the seawater at a depth of30-50meters.Therefore,it is suggested that UUV should navigate and conduct experiment beneath the depth with maximum SDD and keep away from the depth range,where the underwater three-dimensional temperature and salinity structure has significant impact on the SDD,in order to ensure its safety,reliability and invisibility.

关 键 词：水下航行器 海水透明度 三维温盐结构 信息流 

分 类 号：U674.941[交通运输工程—船舶及航道工程] P731.14[交通运输工程—船舶与海洋工程]