0010号台风"碧利斯"对厦门港湾表层海水中溶解无机砷含量的影响     

李俊  郑佩如  杨逸萍  胡明辉 《台湾海峡》2002,21(4):404-410

本文研究了0010号台风“碧利斯”影响期间及其随后的恢复期中,厦门港湾中九龙江口和西港海域站表层海水总溶解砷（TDIAs)、As^3 含量和As^3 /As^5 值的变化特征。结果表明,观测期间两站TDIAs和As^5 含量均比非台风时期呈数倍增加,经10d后仍未恢复到非台风时的水平。As^3 含量也有较大幅度的增加,但波动较大。文中还对观测期间影响溶解无机砷含量的因素进行了初步的探讨。  相似文献   

应用数字地形模型方法分析漳州港海底冲淤变化     

杨顺良  郑承忠 《热带海洋学报》2001,20(3):68-74

利用漳州港海域无围堰填海造地前后的水深测量数据，结合海域地质钻探、表层和柱状沉积物资料，用数字地形模型方法计算了该区海底的冲淤量，分析了冲淤变化及其影响因素，结果显示：（1）淤积主要发生在近岸海域，其主要原因是近岸3-10m厚的海底淤泥层在回填土的挤压和推移下发生形变，产生淤浅假象；另一个原因是回填时部分泥沙流失入海，淤积在近岸海域，致使淤积强度增大。（2）由近岸往外，淤积强度逐渐减弱，并过渡为产中刷状态。  相似文献   

96孔酶标板法测定中国对虾血淋巴上清液抗菌活力和酚氧化酶活性的初步研究   总被引：6，自引：0，他引：6  

雷质文  黄捷  杨冰  张立敬  俞开康 《海洋湖沼通报》2001,(4):33-37

用96孔酶标板法测量单尾中国对虾血淋巴上清液抗菌（Uα）应力和过氧化酶活性。实验表明，该法具有以下优点：1）可测定大批单尾对虾血淋巴上清液的抗菌活力，酚氧化酶活性；2）所需对虾血淋巴上清液微量化；3）用酶标仪读取酶的活性，减少了不同试验者人为读数时的误差；4）重复性高。  相似文献   

用臭氧处理海水对鱼虾的急性毒性效应研究   总被引：9，自引：2，他引：9  

姜国良  刘云  杨栋  吕艳 《海洋科学》2001,25(3):11-13

本实验检测了不同浓度臭氧残留对中国对虾(Penaeus chinensis)、牙鲆（Paralichthys oilvaceus）存活率的影响。结果表明，对虾的耐受力要比牙鲆鱼强，中国对虾在臭氧浓度≥1.0mg/L时，可存活至少48h，而芽鲆在此浓度下3h后，即出现鳃部充血肿胀、呼吸频率加快等不适应现象，48h LC50为0.13mg/L。如果能正确控制臭氧的残留量，利用臭氧净化养殖用水是一个不容质疑的水质净化的好方法。  相似文献   

闽南近海尖头斜齿鲨的生殖生物学研究   总被引：12，自引：0，他引：12  

陈明茹  丘书院  杨圣云 《海洋学报》2001,23(3):92-98

尖头斜齿鲨(Scoliodon laticaudus)是暖水性小型鲨鱼,为有胎盘胎生种类.在闽南近海,其雄鱼的性成熟长度为382～448mm,雌鱼的性成熟长度为405～467mm,1994年5月至1995年4月的周年随机采样中,雌鱼在群体中所占比例为53.0%.雌鱼的妊娠开始于1～4月,同年的6～8月分娩,妊娠期为5～6个月.尖头斜齿鲨雌鱼每个子宫一次妊娠怀胚胎1～12尾,其中3～6尾者占67.8%.雌鱼一次妊娠产仔鱼2～24尾,平均9.1尾,其中6～13尾占70%;57%的母体左右子宫内胚胎数相同.胚胎数量随母体全长的增大而呈线性增加.雌性尖头斜齿鲨生殖周期约为2年,一生生殖2～3次,生殖能力较低.尖头斜齿鲨胚胎在分娩时全长138～142mm,与雌鱼性成熟长度的比为0.30～0.35,胚胎的雌雄比为1.17:1.同一子宫内及左右两子宫中的胚胎发育情况均基本相同.另外还讨论了鲨鱼资源的保护和管理问题.  相似文献   

Wave-Current Forces on Small Square Cylinders (Part I)     

Li Yucheng  He Ming Professor  Dalian University of Technology  Dalian Former master student  Dalian University of Technology  Dalian 《中国海洋工程》1994,(3)

-Based on the extended Morison Equation and model tests, the in-line forces on small square cylinders caused by waves (regular and irregular) and currents are analyzed in detail in this paper. The hydrodynamic coefficient CD and Cu related to KC number and the effect of direction of wave incidence are also given, which can be used in engineering practice.  相似文献   

Research on Characteristics of Density Current Under the Action of Waves     

Li Dashan  Shen Ying  Ren Rushu Chen Yao Senior Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing Associate Professor  Hohai University  Nanjing Master  Hohai University  Nanjing 《中国海洋工程》1997,(1)

In this paper,the characteristics of density current under the action of waves are describedwith the help of flume experiment and theoretical analysis.The study shows that turbid water under the ac-tion of the waves can present three types of motion,i.e.significant stratification,fragile stratification andstrong mixing.The motion of turbid water presents significant stratification when(H/D)/△ρ/ρ~(1/2)≤4.5,generally this state is known as density current.The formulas of motionvelocity,thickness,and discharge of density current moving on horizontal bottom are derived by use of ba-sic equations such as momemtum equation,equation of energy conservation and continuity equation offluid.The time-average velocity and the thickness of density current under the action of waves have a rela-tionship with such parameters as relative density(△ρ/ρ),wave height(H),and water depth(D).Whenthese parameters are determined,the time-average thickness and motion velocity of density current are al-so determined.The relat  相似文献   

Estimation of Axial Pile Bearing Capacity According to Shear Strength Parameters of Soil     

Yu Xiaodong  Yan Shuwang Sun Wanhe Postgraduate Student  Tianjin University  Tianjin Professor  Tianjin University  Tianjin Senior Engineer  Tianjin Port Engineering Institute  Tianjin 《中国海洋工程》1997,(2)

At pesent,it is very popular to estimate pile bearing capacity by use of empirical formula andphysical indexes of soil provided in the design codes for civil construction in China.This paper attempts toapply mechanical indexes of soil and semi-empirical formulas,which are based on soil mechanical theoriesand were summarized and presented by Meyerhof in 1976,to calculate the axial pile bearing capacity.Lo-ading test results of 24 single piles in Tianjin area have been collected and compared with the proposed cal-ulation approach.  相似文献   

Static Analysis of Collision Strength of Offshore Platform     

Li Runpei Chen Weigang Gu Yongning Professor  Shanghai Jiao Tong University  Shanghai Assistant  Shanghai Jiao Tong University  Shanghai 《中国海洋工程》1996,(1)

In this paper a numerical analysis method combining FEM incemental technique with limit analysis concept is proposed for the study of the static strength of offshore platform in collision. Large deformation and plasticity are accounted for and the limit yield surface expressed by generalized stress for a tubular section is derived. The modified stiffness matrix of space beam element is formulated by Plastic Node Method. The buckling behavior of beam columns can also be taken into account. It can trace the generation of plastic hinges during loading and finally the ultimate strength of offshore platform against collision is obtained.  相似文献   

Model Test of Sand Restraining Force on Pipeline     

Zhang Jianguo Yan Chi Yan Shuwang Lecturer  Dept. of Hydraulic Eng.  Tianjin University  Tianjin Associate Professor  Dept. of Hydraulic Eng.  Tianjin University  Tianjin Professor  Dept. of Hydraulic Eng.  Tianjin University  Tianjin 《中国海洋工程》1996,(1)

This paper describes the model tests for determining the axial friction and the lateral resistance of sand to pipeline by using fine sand and prototype pipeline, and the calculation method based on limit analysis theory is verified. The effect of cyclic loading is considered in the test.  相似文献