30天记录的潮汐谱分析   总被引：2，自引：0，他引：2  

叶安乐 《山东海洋学院学报》1983,13(2):1-12

一、引言 目前，存在着不断增长数目的短期(例如30天)潮汐观测记录，特别是越来越多的潮流观测记录已从自动记录仪器获得。这些资料需要人们去分析、研究和利用。多年来，人们通常用经典的调和分析方法来分析短期潮汐记录，而这些方法仅仅提供人们一些预先确定了的分潮的信息。事实上，在不同的地区存在着不同的浅水分潮，而这些浅水分潮则是地区特征的表现。  相似文献   

第二章 重力场与地壳性质     

《海洋学研究》1989,(4):6-9

(一)重力观测 海上重力观测使用两台海洋重力仪,即GSS3(No.53)和KSS31(No.22),前者为后者发生故障时的替补设备。 海上重力观测与世界重力网IGSN71相联时,采用拉柯斯特—龙贝格(LaCoste—Romberg)G型(No.480)重力仪在陆上进行测量。  相似文献   

Spectral Analysis of Nonlinear Drag Forces     

马汝建  李桂喜赵东 《中国海洋工程》2005,19(2):325-332

The spectral properties of nonlinear drag forces of random waves on vertical circular cylinders are analyzed in this paper by means of nonlinear spectral analysis. The analysis provides basic parameters for estimation of the characteristic drag forces. Numerical computation is also performed for the investigation of the effects of nonlinearity of the drag forces.The results indicate that the wave drag forces calculated by linear wave theory are larger than those calculated by the third order Stokes wave theory for given waves. The difference between them increases with wave height. The wave drag forces calculated by use of hnear approximation are about 5% smaller than their actual values when measured in the peak values of spectral densities. This will result in a safety problem for the design of offshore structures. Therefore, the nonlinear effect of wave drag forces should be taken into comidemtion in design and application of important offshore structures.  相似文献   

Numerical Solution of Lock-Release Gravity Current with Viscous Self-Similar Regime     

张立柱李行伟  陈国谦 《中国海洋工程》2004,18(1):157-162

Lock-release gravity currents with a viscous self-similar regime are simulated by use of the renormalization group(RNG) k - ε model for Reynolds-stress closure. Besides the turbulent regime with initially a slumping phase of a conslant current front speed and later an inviseid self-similar phase of front speed decreasing as t^-1/3(where t is the time measured from release), the viseous self-similar regime is satisfactorily reproduced with front speed decreasing as t^-4/5,consistent with well known experimental observations.  相似文献   

A Forced System of Two Cylinders with Various Spacings   总被引：3，自引：0，他引：3  

邹建锋  任安禄邓见 《中国海洋工程》2004,18(3):391-402

The spectrum characteristics and wake structures for a circular cylinder oscillating in a wake are investigated by use of the currently modified virtual boundary method. A forced system of two cylinders with a small spacing ( the downstream one is made to oscillate in the transverse direction) is studied and interesting flow characteristics are observed. A vortex switch and the change of vortex modes (between 2S mode and 2P mode) are observed in the “lock-in“ region. Vortex bands are formed and lost with the increasing excitation frequency. Information concerning saddle points in the flow field is obtained for different excitation frequencies. For a forced system of two cylinders with a large spacing, the upstream cylinder sheds vortexes because there is no downstream cylinder oscillating in the wake. No distinct “lock-in“ response is found for the downstream cylinder.  相似文献   

N0AA发布美国珊瑚礁生态系统新研究报告并为综合观测系统提供依据     

石莉  李雪 《海洋信息》2006,(1):30-31

2005年8月18日，NOAA发布美国珊瑚礁生态系统国家研究报告。根据美国浅海珊瑚礁生态系统状况新的全国评价，美国国家珊瑚礁系统依然承受着来自自然和人类的种利压力，包括：过度捕捞、病害、污染和气候变化。  相似文献   

海洋光学遥感与海洋高光谱特性研究   总被引：3，自引：0，他引：3  

李武  葛运国 《海洋技术学报》1997,16(3):12-16

海洋光学遥感与海洋高光谱特性研究李武辛海英（国家海洋局第一海洋研究所，青岛２６６００３）葛运国（国家海洋局海洋技术研究所，天津３００１１１）１前言１９７８年８月，美国发射了世界上第一颗海洋卫星Ｓｅａｓａｔ－１，标志着海洋探测与陆地、大气探测一样，进入...  相似文献   

介绍验潮井进水孔改进的一种方法     

颜国泰 《海洋技术学报》1991,10(3):76-80

验潮井的功能,在于随潮性和消波性,1984年对福建等地13口验潮井潮汐自记曲线的调查得知,50％左右的验潮井消波性能欠佳.本文以具体数据和图例,介绍四口验潮井进水孔经改进后,消除一定高度海浪的影响,获取较为准确的潮汐记录曲线。  相似文献   

海洋生物-光学算法研究──南黄海叶绿素浓度的估算     

傅克忖  曾宪模  李宝华  曾晓起  荒川久幸 《海洋与湖沼》1997,28(3):238-244

根据１９９５年９月中日合作南黄海现场观测资料，对南黄海生物－光学算法进行研究。首先对南黄海现场多光谱反射比数据进行因子分析，解反射比协方差矩阵的特征问题；解出特征值和对应的特征向量，求出主因子，然后建立叶绿素α对主因子的多元线性回归方程，并对算法进行回报和预报检验。计算结果表明，该算法具有较高精度，同时也显示出天气条件对估算精度产生较大影响。  相似文献   

与海洋开发同步发展海洋观测技术     

李允武 《海洋技术学报》1995,14(4):88-89

与海洋开发同步发展海洋观测技术李允武（国家海洋局海洋技术研究所）我国海洋产业正在高速发展。根据中国海洋报提供的统计数字，１９８０年至１９９０年的十年中，海洋主要产业总产值年增长率为１７％，自９０年代以来，年增长率提高到２８％。１９８９年海洋主要产业总...  相似文献