长江三峡工程的地质构造环境及地球动力学演变分析

根据卫星遥感影像特征和区域地质调查与地球应力分析的综合材料,运用遥感地质学和地球动力学及地质环境演变的分析方法,对长江三峡工程的背景构造(区域构造)-岩块构造(体域构造)-坝区构造(局域构造)进行了多层次的系统研究,查清了地质构造环境演变过程及其变化规律,发现了多级构造序次及多级构造应力场之间的相互转变关系,提出区域应力场与库区荷载应力场和周边采矿卸载应力场的共振效应,是对工程安全运行和长周期工程寿命的最大潜在威胁,为大型工程优化管理和工程灾害风险预防及国家建设合理决策等方面提供科学依据。     

地极移动的非线性动力机制

用非线性动力学原理和非线性振动方法,结合Chandler摆动的时间序列反演,证实了Chandler摆动的衰减能量是由周年激发的非线性共振所补充的．由高布锡归算的ILS参数,按共振激发模型反演出的Chandler摆动衰减指数和频率品质因数等结果,符合已有的大量基本结论,反演出的非齐次项的强迫频率基本都在周年频率的周围．非线性共振模型还表明,Chandler频率的不稳定性是由于存在频率转换和漂移,摆动振幅的不稳定性是由于存在共振跳跃,非线性的存在还将引出组合共振频率．同时用推广的最小公倍数证实和频差频的存在,提供了非整数的最小公倍数算法,为数论的非线性推广和在天文中的应用提供了工具．     

漳州港码头岸线规划潮流及泥沙问题研究

本文在实测资料的基础上，全面分析了漳州港海域的波浪要素，潮流动力，泥沙运移特性和水深演变等，计算了漳州港码头工程前后潮流分布场，并在此基础上预报了漳州港起步工程的３．５万吨级码头泊位、港池、航道的泥沙冲淤幅度。结果表明，漳州港海域的水深维护主要与上游纳潮面积大小有关，海域潮差大，潮流强，水深大，波浪小，海域泥沙主要来源于上游的九龙江，年输沙量为２７７万ｔ，海域年平均含沙量也不大，港池航道水深可由水流动力来维持、泊位和淤积很小，这些情况表明，漳州港屿仔尾海区建港的自然条件是优越的。     

沙埕港污损生物的生态研究

１９９０年３月至１９９１年２月，在闽沂交界处的沙埕港进行周年污损生物挂板试验，共记录生物７０年，其中，海藻１３种，动物５７种，以泥藤壶，网纹藤壶，僧帽牡盛，中胚花筒螅，太平洋侧花海葵，香港网筛苔虫和多种端足类为优势种，全年 生物附着，夏，秋春，冬季的优势种有显著不同，优势种突出，附着量特别大，夏季底层板（６－８月）的湿重生物量达２８．０３ｋｇ／ｍ＾２，为目前全国沿岩港湾生物量之冠。     

Electron paramagnetic resonance spectroscopy as a novel approach to measure macromolecule–surface interactions and activities of extracellular enzymes

The dynamics of high molecular weight organic matter in marine systems are influenced by molecular conformation, interactions with surfaces and susceptibility to enzymatic hydrolysis, parameters that are difficult to observe experimentally. Here we use electron paramagnetic resonance spectroscopy (EPR) and spin-labeled (SL-) polysaccharides to monitor the sorption of SL-polysaccharides to natural sediment surfaces and to montmorillonite and to observe decreases in polysaccharide size due to enzymatic hydrolysis. SL-pullulan, SL-xylan and SL-maltoheptaose all sorbed rapidly to muddy sediments but not to sandy sediments. SL-pullulan and SL-maltoheptaose also both sorbed to montmorillonite; however, SL-pullulan reached substantially greater final surface loadings than did SL-maltoheptaose. Using EPR has the advantages of being rapid (spectra can be acquired in 100 seconds), non-destructive and functional in complex media, including sediment slurries, muddy water or other optically opaque samples, permitting investigation of the interactions between biomacromolecules, extracellular enzymes and mineral surfaces in aquatic environments.     

Influence of non-linearities on the limits of stability of ships rolling in head seas

The present paper describes an investigation on parametric resonance in head seas in which a new third-order coupled mathematical model is considered. The restored modes of heave, roll and pitch are contemplated. The discussion is illustrated for the case of a transom stern fishing vessel at different speeds. It is pointed out that numerical simulations employing the new model are successfully compared to experimental results previously obtained for the vessel.Considering that analyticity is an important tool when handling complex stability issues, some theoretical dynamic characteristics of the equations are discussed. By means of the analysis of the coupled linear variational equation derived from an extended third-order model, the appearance of super-harmonics and increased rigidity proportional to wave amplitude squared due to third-order terms is demonstrated.In the present paper, an important tool is explored, that is the analysis of the limits of stability obtained from the new model. Limits of stability are a well-known and practical way of looking into the problem of parametric resonance. New limits of stability are derived and compared to the more conventional Strut diagram. Dynamic characteristics associated with the new limits of stability are discussed. The influence of different parameters is investigated, including vessel speed, damping and tuning. Consistent and revealing results are obtained through the analysis of the new limits of stability for different speeds and damping.     

广西廉州湾浅地层结构特征及其环境与工程意义

广西北海廉州湾围垦工程是北海市一项开发利用海洋资源，进行多功能开发的重要工程项目。本文介绍了围垦工程区的浅地层声学探测结果，分析了该区的浅地层结构特征，并在此基础上讨论了其浅地层结构的环境意义及工程意义。     

Study on Deposition in Semi-Closed Coastal or Estuarine Harbour Basins

A preliminary study on the distribution of sediment transport and siltation within a semi-closed harbour as well as the factors affecting the siltation has been made with a suspended sediment model, in which the Lianyungang port is used as the prototype. Based on the work, this paper describes a tubid water experiment within a typical excavated harbour basin. According to the experimental results some expressions for predicting the average siltation amount for semi-closed harbour basins by means of dimensional analysis have been proposed, with tidal features, harbour geometry and properties of sediment taken into account. Through comparing the calculated results with the laboratory and field measured data, it has been shown that the expressions presented in this paper are reasonable.