Analyses of the long-term salinity variability in the Bohai Sea and the northern Huanghai(Yellow) Sea     

YUHuaming  BAOXianwen  L&#;Cuilan  CHENXu''en  KUANGLiang 《海洋学报(英文版)》2009,28(5):1-8

Based on the comprehensive collection of the field observed salinity of the Bohai Sea (BHS) and the northern Huanghai Sea (NHS) from the 1950s to the present,the patterns of 10-years-averaged salinity at the different layers in the recent five decades (the 1950s,the 1960s,the 1970s,the 1980s and the 1990s) are obtained by the spatial-temporal interpolation technique with the scrupulous data quality control in this study.Then,by combining the spatial-temporal interpolation technique with successive correction method,the annual distributions of salinity both in the BHS and in the NHS are obtained as well.The data analyses indicate that the overall salinity in the BHS and the NHS increases from the 1960s till the present,with the increase of annual mean salinity of 0.04 psu from the 1950s,and the maximum increase rate of salinity is about 0.14 psu/a in the Bohai Bay.The high salinity tongue extended significantly from the NHS into the BHS.The intensified eastern wind field is related to the western intrusion of the NHS warm current,which probably leads to the moving forward of the high salinity water mass into the BHS.However,it is rather different from the salinity distribution characteristics between the 1950s and the 1960s.The extensive precipitation in the 1960s could lead to an increase in the discharge of the Huanghe River,which might result in the decrease of salinity in the BHS.But the salinity isoline of 32 in the NHS still extended significantly into the BHS in the 1960s.Since the 1980s,the patterns of salinity distribution have changed thoroughly.The salinity in the central area of the BHS was low,while the salinity in the Bohai Bay and the Liaodong Bay was higher than the other regions with its horizontal salinity gradient decreasing in the 1980s.The Empirical Orthogonal Function Analysis (EOF) is also conducted to study the interannual salinity variability of the BHS and the NHS.The correlation coefficient between the time coefficient series of the main mode and the Huanghe River discharge can reach -64.57%.It can be concluded that salinity variation of the BHS and the NHS has strong negative correlation with the Huanghe River discharge.  相似文献   

The application of geographic information technology to coastal geomorphology     

GUOWei  LIShuheng  ZHUDakui 《海洋学报(英文版)》2009,28(5):49-57

With the development of modern oceanic observation technologies,coastal survey data have been experiencing a substantial growth.The integration management of the data from different disciplines,different sources and different formats has become a major research field in coastal geomorphology by using Geographic Information System (GIS).This paper puts forward a new methodology framework of GIS techniques in coastal ocean geomorphology,including data acquisition,process,analysis,and representation.It focuses on some major GIS techniques to study the land-ocean interaction mechanism,such as spatial analysis,submarine topography model and three-dimension (3D) visualization,and apply its result to coastal urban planning,harbor site selection and geomorphology environment about coral reef and islands on the continental shelf.The case studies cover the whole coastal ocean to serve the social community,economical development and diplomatic rights for decision-making all round in the coastal zone.The research shows clearly that the application of coastal multi-source geospatial platform has changed the traditional coastal geomorphology science dramatically from its research scope,fields and methods,however,as made clear in this paper,extracting accurate information from remote sensing data and GIS databases for coastal geomorphological applications is a nontrivial challenge that requires the combined knowledge and skills of information scientists and geomorphologists.  相似文献   

区域性海洋要素持续测量平台新技术概述   总被引：2，自引：2，他引：0  

陈永华  李思忍 《海洋科学》2009,33(4):76-80

21世纪是海洋的世纪,海洋要素现场观测对海洋学研究、海洋工程建设和海上国防安全等诸多方面具有深远的意义.比如近年来气候的剧烈变化,就是由大气和海洋共同作用的结果,且受海洋的影响较大[1],因为海洋表层储存的热量比大气多1 000多倍.  相似文献   

核酸探针技术及其在海洋浮游植物检测中的应用   总被引：1，自引：0，他引：1  

李秀芹  于志刚  米铁柱  蔡青松  甄毓 《海洋科学》2009,33(3):87-92

在海洋生态系统中,浮游植物是初级生产者,通过其生命活动影响和改变着海水的理化性质;反过来海水环境的污染和破坏也会作用于浮游植物个体、种群和群落.  相似文献   

绿藻氢化酶及其产氢代谢的分子生物学研究进展     

范晓蕾  郭荣波  王广策  许晓晖  时艳侠 《海洋科学》2009,33(1):77-83

随着全球工业的迅猛发展,对能源的需求量大幅增加,由于不可再生的矿物能源储量有限,导致能源危机逐渐映现,因此,开发可再生的洁净新能源成为亟待解决的全球性问题.H2由于其能量密度高,燃烧后只生成水,不造成任何污染,成为最理想的可再生能源之一.在各种制氢方法中,绿藻制氢以太阳能为能源,以水为原料,通过光解水制取H2,是目前生物制氢技术研究的热点.  相似文献   

海底隧道防排水技术浅析——以厦门翔安海底隧道为例     

许文锋 《台湾海峡》2009,28(1):102-106

由于海底隧道的特殊性,其防排水技术与一般陆地隧道有着显著区别,本文介绍了厦门翔安海底隧道的防排水方案设计情况,对方案实施效果进行了评估．得出了海底隧道防排水应结合围岩与支护的自防水功能采取以堵为主的原则,并针对海底隧道防排水方案实施中的问题,提出了对初期支护背后注浆是重点,改进注浆材料等建议．从而论述了防排水技术是海底隧道工程建设的核心问题．  相似文献   

海域勘界技术的应用   总被引：1，自引：0，他引：1  

张维林 《台湾海峡》2009,28(3):432-436

制订划界方案是海域勘界工作的核心工作,包括资料分析、初拟划界草案、草案协调和协商等阶段．大多数海域界线需要分段划分．勘界实践表明,不同界线及其不同区段的界线必须运用不同的划界技术,如垂直岸线法、水道（航道）中心线法、协议线法、习惯线法、中点连线法、用海界线法及岛礁中间线法等．草案协调是勘界工作的难点,必须采取背靠背协调、面对面协商及反复沟通等方法,促成双方达成共识．  相似文献   

直接数字频率合成技术在声学释放器中的应用     

贾立双  张选明  张少永 《海洋技术学报》2009,28(1)

直接数字频率合成技术(DDS)是一种新的频率合成方法,它具有转换时间短、相位变化连续、全数字可编程等优点.文中介绍了ADI公司生产的AD7008芯片作为频率信号源在声学释放器中的应用.  相似文献   

DEM地形可视化自增强技术   总被引：1，自引：0，他引：1  

王春  王占宏  李鹏  李伟涛 《地理信息世界》2009,7(1)

地形可视化是地形表达、虚拟地理环境与虚拟仿真领域中重要的组成部分.论文首先回顾了DEM地形分析与表达技术,然后重点阐述了如何利用DEM自身解译的地形信息,增强DEM地形等高线图、地形晕渲图等地形可视化效果,突出不同地形特征与细节,实现可量测性和直观性为一体的3维地形表达,提供用户更为直观、准确的地形认知.  相似文献   

一种改进的Apriori挖掘算法     

李唐平  陶宏才 《成都信息工程学院学报》2009,24(6):537-540

针对制约Apriori算法效率的瓶颈问题,提出了一种基于Apriori的改进算法,算法只需要遍历一次事务数据库,避免了Aprori算法多次扫描事务数据库和产生大量的候选项集,同时利用项集的有序性改进了判断连接的方式,优化了连接步骤,减少了判断时间.实验结果表明,改进的Apriori算法在运行效率上有一定的提高.  相似文献