空间互相关方法在分析海底沙波迁移规律中的应用

海底沙波具有显著的活动性并能够对海底工程设施造成潜在威胁,因此对海底沙波活动性的评估一直以来受到广泛关注。目前大多数研究者仍利用平面剖面对比来分析海底沙波的迁移特征。然而,该方法难以全面高效地获取海底沙波二维平面迁移矢量。本文基于2007年和2009年的高分辨率多波束测深数据,详细阐述了空间互相关方法在分析北部湾东南海域海底沙波迁移规律中的应用过程。利用实测数据进行对比分析,获得了研究区海底沙波的活动特征,并进一步讨论了空间互相关算法中不同参数的选取对结果的影响。结果显示,利用空间互相关分析方法能够有效获取海底沙波二维迁移矢量,获得的海底沙波迁移速率和迁移方向与前人研究成果吻合,表明了该方法的可行性和可靠性。但在对实际DTM数据进行空间互相关分析时,需根据海底沙波形态、数据质量等因素选取合适的参数及矢量获取方法。本研究实验了一种确定海底沙波迁移规律的新方法,该方法将有效提升获得海底地形变化规律的效率和准确度,可获得更加精细的海底地形动力过程。     

广西红树林根际土壤放线菌的原位培养分离及其活性筛选

为了发掘广西红树林根际土壤的放线菌资源,本文利用原位培养装置,埋于根际土壤中俘获放线菌,30d后取回实验室,采用平板涂布法对4个地点的原位培养样品于15种培养基上进行分离纯化;对分离株基于16SrRNA基因序列进行系统发育分析;进一步进行抗菌活性和产酶活性检测。共分离得到113株放线菌。对其中33株放线菌进行测序,结果表明20株属于链霉菌属,11株属于拟诺卡氏菌属,1株属于伦兹氏菌属,1株与拟诺卡氏菌属相似性最高为90%,很可能属于放线菌一个新属。抗菌实验结果显示其中有7株、4株、18株、6株、10株、3株实验菌株分别对大肠埃希菌、铜绿假单胞菌、金黄色葡萄球菌、普通变形杆菌、乙型溶血性链球菌和肺炎克雷伯氏菌具有抑制作用;有55株、62株、24株、72株的实验菌株分别具有纤维素酶活性、淀粉酶活性、胶原蛋白酶活性、酯酶活性。原位培养可以丰富对广西红树林根际土壤的认识,分离到了新种甚至可能是新属的放线菌,分离得到的部分放线菌菌株具有较高生物活性,为后续工作提供了良好的实验材料。     

杭州湾潮混合的初步研究 Ⅱ. 下湾区

1964年作者发表了“杭州湾潮混合的初步研究Ⅰ.上湾区”一文(毛汉礼、甘子钧等，1964)。根据表征入海径流冲淡作用的河口盐度沿程分布和变化特征，将杭州湾以海盐为界划分为上湾区和下湾区：海盐以上的上游段为上湾区，其潮混合为强混合型；海盐至湾口的下游段为下湾区。其后，又对杭州湾的盐度分布、水系和环流做了初步分析，并对潮汐、对流和风浪等作用所导致的涡动混合现象作了粗略的讨论，认为要合理地阐明下湾区的混合过程似应同时考虑侧向与垂向的混合效应(毛汉礼．沈鸿书等，1964)。本文根据1963年在杭州湾下湾区进行专题水文调查所获得的资料，对杭州湾下湾区的潮混合问题进行了研究：对表征该区潮混合扩散过程的某些特征量，如水平涡动扩散系数、水平涡动交换系数等作出量级估计，并给出涡动交换椭圆；估算了控制这一河口区域盐量平衡与动量平衡的各项物理过程的相对重要性，为进一步开展杭州湾下湾区潮混合过程的观测和理论研究提供依据。     

An Electronic Chart Display and Information System

This article introduces the most advanced form of electronic chart display and information systems (ECDIS) which complies with the performance standards for ECDIS established by the International Maritime Organization (IMO) and International Hydrographic Organization (IHO). It also describes the key features and the important functions of ECDIS, which we developed. This system is different from the productions developed by C-map, Seven-cs, offshore, and others. It is more suitable for China Marine Safety Administration Bureau to manage the navigation marks real-time. Using this system charts were located and accessed rapidly, and displayed smoothly. This article also discusses in ECDIS application system how to dynamically access and desert charts data in a limited memory (limited computer memory and resource). We constructed a tridimensional structure to manage a large amount of charts data. Vertically, according to the scale range, all charts were divided into eight levels, and a data structure called as “Multiple Scale Quad-tree” was constructed. And horizontally, a grid (every unit has a fixed size) was given to a certain scale level. We call this data structure a “Regular Page.” We explore the implementation of such a structure on the worldwide charts management utilizing quad-trees. Then we discuss the future development of ECDIS and its application system in marine agencies in China.     

Upper-ocean variation in the northern South China Sea from mooring station observations

I~IOXThe northern South China Sea is the frontal region for the water exchange between the sleuthChina Sea (SCS) and its neighboring seas. Its northeast part connects to the East China hothrough the Taiwan Strait and the east part ~ates with the Pacific Ocean by the LUZOn Strait.The a~heric interface over the northern SCS is the important paSSage for the South China Seamourn. Therefore, the uPPer vallationS Of the northern SCS are not Only affected by the dynndc and thermed~c d…     

南海北部上层海洋变化的定点观测分析

对南海季风试验(CSMEX)加密观测期(IOP)“实验3”号船在南海北部获得的CTD温盐和声学多普勒流速剖面仪(ADCP)海流等观测资料进行分析,给出东沙群岛西南部大陆坡附近IOP两个阶段定点观测的海洋分量部分结果,通过分析海水的动力、热力学结构,描述夏季风暴发、维持期间该测站上层海洋的变化,讨论近表面水的温度、盐度和海流对海面风场的响应.     

A method to estimate the forces exerted by internal solitons on cylindrical piles

Internal soliton is the large amplitude wave existing in the pycnocline, induced by internal tide in the condition of special bottom topography. During its propagation process, the induced disturbance can bring about strong convergence of sea water and sudden strong current (wave-induced-current), which can cause severe threat to the ocean engineering structures, such as oil drilling platform and pipeline. In this paper, Morison’s empirical method, modal separation and regression analyses are introduced to estimate the forces and torques exerted by internal soliton on cylindrical piles. As an example, a limited set of observational data recording a passage of the internal soliton near Dongsha Islands is used to estimate the horizontal velocity and its acceleration in a vertical section for computing the force and torque on a supposed pile, and the estimation results are reasonable. It is shown that, the higher number of the modes retained in the calculation, the better the estimation of velocity profile fits the observational one. A better overall approximation to the real solution can be reached if there are more observational current data acquired in a whole vertical profile.     

Dynamic Analysis of a Single-Column Platform (II)

This paper describes the study of a single-column structure used as well-head platform. In order to check the reliability of computation theory and programme, model tests have been carried out. The paper introduces the conclusion of tests and the dynamic properties of single-column platform are obtained.     

乙酰褐藻酸丙二酯的制备与表征

为了改变褐藻酸丙二酯的溶解性,本文以氢碘酸为催化剂,将褐藻酸丙二酯与乙酐反应,制备了乙酰褐藻酸丙二酯。生成物不溶于水,可溶于多种中等极性的有机溶剂。本文用IR,~1H-NMR,HGPC对其进行了表征,并对反应条件对产率的影响进行了探讨。