Numerical Study on Instantaneous Discharge of Unsorted Particle Cloud in Cross Flow

The mixing characteristics of particles such as dredged sediment of variable size discharged into cross flow are studied by a 3D numerical model, which is developed to model the particle-fluid two-phase flow. The Eulerian method with the modified k-ε parameterization of turbulence for the fluid phase is used to solve fluid phase, while a Lagrangian method for the solid phase (particles), both the processes are coupled through the momentum sources. In the model the wake turbulence induced by particles has been included as additional source term in the k-ε model; and the variable drift velocities of the particles are treated efficiently by the Lagrangian method in which the particles are tracked explicitly and the diffusion process is approximated by a random walk model. The hydrodynamic behavior of dumping a cloud of particles is governed by the total buoyancy of the cloud, the drag force on each particle and the velocity of cross-flow. The computed results show a roughly linear relationship between the displacement of the frontal position and the longitudinal width of the particle cloud. The particle size in the cloud and the velocity of cross flow dominate the flow behavior. The computed results are compared with the results of laboratory experiments and satisfactory agreement is obtained.     

One new species of free-living marine nematodes (Enoplida,Anticomidae, Cephalanticoma) from the Huanghai Sea

One new species of free-living marine nematodes Cephalanticoma filicaudata sp. nov. from the Huanghai Sea, China is described and illustrated. Cephalanticoma filicaudata sp. nov. is characterized by well developed cephalic capsule, three teeth at the anterior of oesophagus, excretory pore opens posterior to cervical setae, only two cervical setae per file, body length longer than 5 200 μm, tail long and no ventral-lateral seta between the supplement and the cloacal opening. Types are deposited in the College of Marine Life Sciences, Ocean University of China.     

大黄鱼病原弧菌拮抗放线菌的筛选与人工诱变

从厦门集美海滩底泥分离得到38株放线菌，用琼脂块法测定它们对大黄鱼病原弧菌-溶藻弧菌和副溶血弧菌的拮抗效果，选择两株拮抗效果较好的放线菌进行诱变，测定诱变后各菌株的抗菌效果，并选择抗菌效果较好的菌株进行第二次诱变，如此反复诱变3次，共得到97株放线菌，结果表明；38株放线菌中的22株对两株病原菌有一定的拮抗作用；用紫外线照射可以获得少量对两株病原菌拮抗作用加强的菌株。     

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

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。     

Formation of Equilibrium Beach Profile of the Abandoned Yellow River Delta Coast in North Jiangsu

The abandoned Yellow River Delta coast is a typical erodible silty and muddy coast in China. The paper analyses the marine dynamic characteristics and the mechanism of beach erosion of this area. Analysis and calculation show that in this sea area wave and tidal current action should be considered. Based on the above analysis, an equilibrium beach profile calculation model is developed, in which the wave-current interaction is considered while sediment supply and sediment re-deposition are neglected. The model consists of four parts: (1) calculation of wave parameters, (2) calculation of velocity due to wave-current interaction at different water depth, (3) calculation of friction velocity and shear stress at different water depths, and (4) calculation of the amount of sediment erosion, erosion intensity and variation of beach profile. Calculated results are in good agreement with observed data. Finally, the evolution tendency is discussed and the equilibrium beach profile of this coast is calculated. B     

不同软基处理方法适用性比较

总结分析了国内外现有的软土地基处理的各种方法。通过对采用不同方法进行软基处理的工程实例处理效果的定量对比，发现不同软基处理方法的适用性差异很大，多数工程中仅用一种方法很难达到设计要求，而两种或多种方法联合则可望取得更好的效果。     

海水仔稚鱼脂类营养研究进展

近年来国外海水仔稚鱼脂类营养研究取得了重要进展。作者从海鱼鱼卵和早期仔稚鱼阶段的脂肪酸成分、海水仔稚鱼饥饿时脂肪酸的保存、海水仔稚鱼脂类的消化、吸收和运输、饲料中磷脂的作用和影响、饲料磷脂与甘油三酯的效率、饲料的必需脂肪酸、必需脂肪酸的定量需要、高度不饱和脂肪酸以及EPA和DHA比例的重要性等方面综述脂类营养对海水仔稚鱼生长的影响     

中国砂质海岸分布特征与存在问题

中国东部砂质海岸分布范围广泛,地形发育多样,风沙灾害、海岸侵蚀等地质灾害问题多发,严重影响了沿海地区的社会经济发展。了解沙质海岸的分布特征,做好砂质海岸的研究防护工作,对促进海洋经济持续稳定的发展有着十分重要的作用。     

潮滩演变规律在围堤选线中的应用——以江苏辐射沙洲内缘区为例

滩涂围垦是沿海地区耕地占补平衡的重要手段。如何进行合理的围堤选线,尽可能减小围堤对潮滩水沙环境的影响,使匡围后的潮滩演变不影响海堤安全,是围海工程设计时必须考虑的问题。以江苏辐射沙洲内缘区仓东垦区匡围工程为例,运用潮滩均衡态概念框架,对条子泥西侧岸滩平均高潮位点变化、师地岛形成及潮沟活动性等潮滩演变特征及趋势进行了分析,并重点探讨了其在围堤选线中的应用。     

荧光法在赤潮图像分析中的应用

赤潮藻样品中往往包含着各种复杂的非藻沉淀物,为解决这些微藻的探测和分析的问题,可以利用微藻类在一定波长的光照射下会产生荧光的特性,对裸甲藻等多种赤潮藻类进行荧光实验处理,并在此基础上对藻类的荧光图像和灰度图象进行图像分割,轮廓和纹理分析及图象识别等后继图象处理。实验证明,荧光法可以有效的去除背景噪声,保留藻类信息,使得后继的图象处理工作更加容易和有效,从而解决了探测和分析包含复杂背景的沉淀物样品中微藻的问题。