好氧颗粒污泥系统快速启动试验研究   总被引：2，自引：0，他引：2  

王琳  孙磊  林跃梅 《中国海洋大学学报(自然科学版)》2006,36(2):299-302

采用3组圆柱型SBR反应器进行活性污泥颗粒化培养,接种浓度分别为12 500mg.L-1,4 400mg.L-1和1 800mg.L-1。由于采用逐步缩短沉降时间这一有效措施,系统启动20d后,颗粒污泥初步形成,污泥浓度可达到6 000~8 000mg.L-1,高于普通活性污泥系统,且沉降性能良好,SVI值在50mL.g-1左右。颗粒污泥的平均粒径稳定在0.2~0.25mm。在活性污泥颗粒化的启动试验中,在生物化学条件相同的条件下,逐步缩短沉淀时间可以加快好氧污泥颗粒化系统的启动。  相似文献   

派比安台风对上海黄浦江潮位的影响及成因探讨   总被引：3，自引：3，他引：3  

徐建成 《海洋预报》2001,18(1):1-10

2000年派比安台风产生的历史第二高潮位对上海的防汛带来严重影响。本文通过比较历史上的风暴潮，从动力机制、天文高潮与增水极值相碰头，潮波共振和水利工程的影响等四个方面分析了这次风暴潮造成的高水位，及台风余振期边缘波的影响，并用SLOSH（Sea,Lake,Overland Surge from Hurricanes)模式模拟了这次风暴潮，为防台减灾的正确决策提供了理论依据。  相似文献   

A Compact Explicit Difference Scheme of High Accuracy for Extended Boussinesq Equations     

周俊陶林建国  谢志华 《中国海洋工程》2007,21(3):507-514

Presented here is a compact explicit difference scheme of high accuracy for solving the extended Boussinesq equations.For time discretization,a three-stage explicit Runge-Kutta method with TVD property is used at predicting stage,a cubic spline function is adopted at correcting stage,which made the time discretization accuracy up to fourth order;For spatial discretization,a three-point explicit compact difference scheme with arbitrary order accuracy is employed.The extended Boussinesq equations derived by Beji and Nadaoka are solved by the proposed scheme.The numerical results agree well with the experimental data.At the same time,the comparisons of the two numerical results between the present scheme and low accuracy difference method are made,which further show the necessity of using high accuracy scheme to solve the extended Boussinesq equations.As a valid sample,the wave propagation on the rectangular step is formulated by the present scheme,the modelled results are in better agreement with the experimental data than those of Kittitanasuan.  相似文献   

疏浚物倾倒区海水水质级别的模糊综合评价     

刘现明  徐恒振 《海岸工程》1995,14(2):33-37

应用模糊综合评价方法对大连臭水套海域疏浚物预选倾倒区的水质状况进行了评价，得到了有益的结论。  相似文献   

长江口水域双带蛤科一新种     

徐凤山 《海洋与湖沼》1996,27(2):200-202

于１９８５－１９８６年在长江口的底栖生物取样中，采到大量双壳类软体动物标本。鉴定表明，其中一新种，被定名为中华团结蛤Ａｂｒａ ｓｉｍｉｃａ ｓｐ．ｎｏｖ。，属樱蛤超科中的双带科（Ｓｅｍｅｌｉｄａｅ）。模式标本保存于中国科学院海洋研究所。  相似文献   

台湾海峡台风暴潮非线性数值计算   总被引：2，自引：1，他引：2  

吴培木  许永水  李燕初  陈玉霞  陈季良 《海洋学报》1981,3(1):28-43

台湾海峡平均水深不大于50米,台风侵袭频繁.由于台湾岛的“墙壁效应”和台湾海峡的“狭管效应”的影响,台湾海峡的台风暴潮显得较为独特.以前,我们及其他兄弟单位对福建沿海台风暴潮的研究,大多数仅局限于单站的气-水动力相互作用的研究,很少涉及整个海峡.虽说我们也曾作过福建沿岸台风暴潮现场调查,但进行次数有限,了解的也仅是海峡西岸局部地区的情况,它仅能反映台湾海峡台风暴潮的一个侧面,而无法了解整个海峡地区的风暴潮全貌.  相似文献   

2-D TIDAL FLOW BY OPERATOR-SPLITTING METHOD     

何少苓  林秉南 《海洋学报(英文版)》1986,5(4):508-516

In this paper, the method of operator splitte is applied to simulate the tidal flow in the Hang-zhou Bay. Different schemes of splitting have been devised and compared.Results of the study indicate that good simulation can be achieved. Besides being simpler in form, this method is flexible and allows much freedom in selecting the mode of splitting and the scheme of computation.  相似文献   

Parabolic Wave Propagation Modelling in Orthogonal Coordinate Systems     

袁德奎  林斌良肖鸿 《中国海洋工程》2004,18(3):445-456

This paper presents a numerical model study of the propagation of water waves using the parabolic approximation of the mild-slope equation in the orthogonal coordinate system. Two types of coordinate systems are studied: (a) a general form of orthogonal coordinate system and (b) the conformal system, a special form of orthogonal coordinate system. Two typical examples, namely, expanded breakwaters and a circular channel, are studied to validate the model. First, the examples are studied by use of the general orthogonal coordinates. Then the same examples are computed by use of the confonnal system. The computational results show that the confonnal coordinate system generally gives better predictions than the general orthogonal system. A numerical technique for generating the conformal grid is combined with the numerical model to improve the practicability of the model. The comparison between the result from the numerical grid system and that from the analytical grid system shows that reliable computational results can be obtained by use of the numerical confonnal grid system.  相似文献   

打好“桥”牌,顺利实现舟山市由海岛经济向半岛经济的转型          下载免费PDF全文

黄旭 《海洋开发与管理》2005,22(5):80-87

2008年,浙江省舟山市这个千岛城市将成为半岛城市,其海岛经济也将向半岛型经济转变.实现这个经济转型,首先全市上下应提高思想认识,其次三大产业的发展上要有新调整,在主攻海洋经济时,应将长三角和全国作为发展的腹地,凸现半岛在经济发展中的优势,还应处理诸如发展经济与保护资源环境等方面的关系.  相似文献   

悬浮沙激光散斑图像处理的研究     

杜军兰  陈靖齐  于连生  刘海坤  徐雷 《海洋技术学报》2001,20(1):107-111

本文以统计模式识别为基础，阐述了图像处理在悬浮沙粒粒径流量中的实际应用，提出了用图像层析来确定放大系数的方法，提出了测量的准确度。  相似文献