泰利台风对台湾东北黑潮入侵东海陆架影响的研究

本文利用卫星高度计数据和分析数据,并结合同时期现场深水潜标的流速观测数据,研究了超强台风泰利过境前后台湾东北附近海域流场、位势密度场、位势涡度场以及黑潮入侵东海陆架强度的变化。分析结果表明,泰利台风通过改变台湾东北陆坡附近海域的流场、位势密度场,显著地削弱(增强)了西段(东段)陆坡附近的位势涡度梯度,从而使得西段(东段)陆坡黑潮入侵东海陆架的强度显著增强(减弱)。此外,本文还区分了台湾东北西部陆坡附近表层的跨陆坡“上凸型”位势涡度分布与次表层的跨陆坡“下凹型”位势涡度分布,并认为次表层的跨陆坡“下凹型”位势涡度分布也应作为台湾东北西部陆坡附近“位势涡度障碍”的重要组成部分。本文的研究结果揭示了大气中的台风过程对台湾东北黑潮入侵东海陆架产生显著影响的关键过程及机制,相关结论可为台湾东北黑潮入侵东海陆架变化规律的研究提供有价值的参考。     

不同水温对文昌鱼性腺发育的影响

研究表明，不同水温对文昌鱼性腺发育分化和成熟有十分显著的影响。１４℃对文昌鱼性腺发育没有显著的作用，２０和２５℃十分有利于性腺发育和成熟，经４０ｄ培养，出现一些雌、雄文昌鱼产卵和释精以及加速性腺发育。本文还讨论了水温促进性腺发育可能的机制。     

用新显色剂3-甲氧基-甲亚胺H光度测定海水中的硼

采用新试剂３－甲氧基－甲亚胺Ｈ测定海水中的硼，加入ＥＤＴＡ和酒石酸掩蔽各种干扰离子，不须分离可直接测定，方法简便、快速、准确。     

Role of mangrove in mercury cycling and removal in the Jiulong Estuary

Baseline of mercury in mangrove swamp The mercury content in sediments in the Jiulong Estuary was determined in 1984 and 1985(Table 1). The highest content of mercury in sediments (300×10~(-9)) was found in Ditou, contrast-ing strongly with the low content of 36×10~(-9) in Port Dongzhai in the Hainan Island. Tab1e 1 showsthat the average content of mercury in sediments in the Jiulong Estuary is 140×10~(-9) and the averageof four areas is 72×10~(-9). This value means that these areas have not been heavily contaminated by     

Numerical analysis of the sea (lake) breeze dynamics and initialization of the model

In this paper, analysed are the effects of synoptic wind, earth-rotation inertia and land surface roughness on sea (lake) breeze process, on the basis of the calculated results of a 2-D primitive equation model with turbulent energy closure. The results show that a moderate background wind field acts as a trigger for sea (lake) breeze onset, and presents prominent effect on the breeze intensity, inland advance rate and structure feature. The effects of Coriolis force not only make the breeze veering round, but also damp the development of the breeze component normal to shore.The paper also discussed the dynamic method of wind field initialization based on one-site radiosonde. Three approaches of initialization have been tested. In comparison, it was found that the approach of one-dimensional dynamic initialization with nudging term was preferable to the others.     

长江口南支潮流的一个数值模拟

为了能够精确地拟合天然水域不规则的水陆边界,并能保持有限差分数值计算在矩形网格中进行,本文利用Thompson的数值网格生成技术,在长江口南支七丫口至横沙河段设计了一个椭圆型边界拟合坐标系,并在这个坐标系下建立了平面二维潮流数学模型。通过数值求解此数学模型,实现了计算区域内现状潮流的一个数值模拟,模拟结果表明,模式的设计是成功的。     

九龙江口红树林上附着动物的生态

福建九龙江口红树林附着动物７种，白脊藤壶Ｂａｌａｎｕｓ ａｌｂｉｃｏｓｔａｔｕｓ和白条地藤壶Ｅｕｒａｐｈｉａ ｗｉｔｈｅｒｓｉ在数量上占绝对优势，是危害红树的主要附着动物。附着动物在河口红树林区的数量分布随着盐度的降低而减少，其栖息密度和生物量的高峰期在夏，秋两季。生长茂密的红树林（郁蔽度大于０．５），附着动物主要分布于水流畅通的向海边缘和潮沟边缘的红树上。水流畅通程度是影响附着动物在红树林区向纵     

星载SAR浅海水下地形和水深测量模拟仿真──水下地形高度、坡度和方向与可测水深分析

根据星载合成孔径雷达(SAR)浅海水下地形和水深成像机理,建立了浅海水下地形和水深雷达后向散射截面仿真模型.利用该模型模拟并分析了不同地形条件下,浅海水下地形的雷达后向散射截面.分析结果表明,水下地形高度越高,SAR可测量的水深越深;水下地形坡度越大,越易被SAR所观测.水下地形的星载SAR测量还与水下地形的方向有关,与卫星飞行方向平行的水下地形最易被SAR观测,与卫星飞行方向垂直的水下地形最不易被SAR观测.     

成山卫沙坝潟湖链的形成和近期演化

山东荣成市成山头南侧发育了一条沙坝和一系列的湖 ,组成成山卫湖链 ,以面积最大的天鹅湖有关资料为主 ,运用粒度分析、软体动物鉴定、14 C测年等方法 ,对So5 ,Sh5 ,Sh1和Sh6孔岩心进行分析 ,揭示了该湖链的形成过程 :距今 70 0 0a左右 ,海水开始入侵 ,形成了荣成湾 ,距今 6 0 0 0a左右 ,沙坝和坝内的一系列半封闭湖形成 .根据沙坝层理的观测资料分析了湖形成后自然作用下的演化动态 ,并指出近年来由于人类活动加剧 ,严重影响了湖的演化过程     

An experimental method for determining the frequency-dependent added mass and added mass moment of inertia for a floating body in heave and pitch motions

Most of the existing relevant materials have been obtained from experiments, in which evaluating the added mass at the resonant frequency corresponding to the peak of a frequency-response curve obtained from the “forced” vibration analysis is the most popular technique. In this paper, a simple experimental method was presented where the “free” vibration responses instead of the “forced” ones were used to determine the values of m_ah and I_ap. The main part of the experimental system is composed of a floating body (model) and a spring–shaft shaker. The “free” vibration of this main part was induced by imposing on it an initial displacement (and/or an initial velocity), and from the time histories of displacements information such as the “damped” natural frequencies, damping ratios, sectional added mass coefficients (C_V and C_P) were obtained. Since the displacements of the spring–shaft shaker are “translational” and those of the floating body due to pitch motions are “angular”, a technique for the transformation between the associated parameters of the two components of the main part was presented.