福建近海主要经济渔业生物营养级和有机碳含量研究   总被引：2，自引：0，他引：2  

卢振彬  黄美珍 《台湾海峡》2004,23(2):153-158

本文研究了福建近海52种鱼类、6种虾类、4种蟹类、1种虾蛄和4种头足类的食性和营养级及其有机碳含量。结果表明：营养级以鱼类最高，为2．1～3．7级，平均2．65级；头足类为2．04～2．88级，平均2．60级；蟹类2．38～2．73级，平均2．58级；虾类最低，为1．64～2．21级，平均1．96级．干样有机碳含量百分率也以鱼类最高，为33．0％～76．2％(m／m)，平均46．25％(m／m)；头足类为27．80％～46．16％(m／m),平均40．24％(m／m)；虾类为30．60％～38．40％(m／m),平均34．90％(m/m)；蟹类最低,为25．00％～30．78％(m/m)，平均28．24％(m／m),鲜样有机碳含量百分率还是以鱼类最高,为4．80％～29．55％(m／m),平均13．75％(m／m)；蟹类为8．90％～12．68％(m／m),平均10．74％(m/m)；虾类为6．97％～11．53％(m/m)，平均9．55％(m/m)；头足类最低仅为7．38％～8．52％(m／m),平均7．95％(m/m),干样有机碳含量百分率和鲜样有机碳含量百分率与营养级均成正相关，但前者的相关性高于后者。  相似文献   

海水中低含量铵氮的高灵敏度荧光法测定   总被引：3，自引：0，他引：3  

余翔翔  郭卫东 《海洋科学》2007,31(4):37-41

提出了一种改进的、可测定海水中低含量铵氮的高灵敏度荧光分析方法。其原理是在硼酸缓冲溶液的作用下,海水中的铵氮与邻苯二甲醛(OPA)发生衍生化反应,通过测定生成的荧光产物来确定水体中铵氮的浓度。方法的检测限极低(0.002 5μmol/L),重现性好,且水样用量少(10 mL),适用于海水中溶解有机物的光铵化研究及其他低铵含量水样的测定。  相似文献   

The dynamic behaviour of a river-dominated tidal inlet, River Murray, Australia     

B. Shuttleworth  A. Woidt  T. Paparella  S. Herbig  D. Walker   《Estuarine, Coastal and Shelf Science》2005,64(4):131

Australia's largest river, the River Murray, discharges to the southern ocean through a coastal lagoon and river-dominated tidal inlet. Increased water extractions upstream for irrigation have led to significantly reduced flows at the mouth and, as a result, the area is undergoing rapid change, particularly with regard to the rate at which sediment is being transported into the lagoon. Based on detailed and accurate bathymetric surveys it has been possible to estimate that the rate of lagoon in-filling is of the order of 100,000 m³ per year for the period June 2000 to May 2003, although the actual rate shows significant year to year variability. Dredging of the lagoon commenced in 2000 in an attempt to reverse the trend.In an effort to understand the behaviour of the inlet a one-dimensional numerical model of the inlet has been developed. The model extends the original of van de Kreeke by including a dynamic inlet throat area based on predicted river flows and a sediment transport module to predict the resulting net sediment transport. Comparisons with water level data collected on both the ocean and lagoon sides of the mouth have shown that the model is able to predict the attenuation and lag of the tidal signal reasonably well. The sediment transport model was based on predicted sediment concentrations in the surf zone and was found to predict the rate of sediment in-filling to an acceptable level of accuracy. It is envisaged that the model will be a useful management tool, especially since it is possible to manipulate river discharges to the mouth.  相似文献   

Comparison of two three-dimensional hydrodynamic modeling systems for coastal tidal motion     

Q.Y. Zhang   《Ocean Engineering》2006,33(2):137-151

A comparison of two three-dimensional numerical modeling systems for tidal elevations and velocities in the coastal waters is presented. The two modeling systems are: (1) the Princeton Ocean Model (POM) and (2) the MIKE 3 flow model. The model performance results for Singapore's coastal waters show that the predicted tidal elevations from the two hydrodynamic modeling systems are almost identical and are in very good agreement with field measurement data. The simulated tidal current velocities match well with field measurement data at the selected stations, but it seems that the POM provides the slightly better simulation, compared to the MIKE 3 flow model. The depth profiles of the velocities obtained from the two modeling systems may be greatly different at some time, due to the vertical diffusion coefficient calculated from different turbulent sub-models in the two modeling systems. The POM generally predicts larger peak tidal velocities. The maximum speed differences for the model results from the two modeling systems occur in the top and differ from time to time and from location to location, reaching up to 20%.  相似文献   

Body weight, sexual maturity, and spinal deformity in strains and families of Atlantic cod (Gadus morhua) at two years of age at different locations along the Norwegian coast     

Kolstad  K.; Thorland  I.; Refstie  T.; Gjerde  B. 《ICES Journal of Marine Science》2006,63(2):246-252

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东部沿海滩涂和浅海资源大开发之我见     

杜渺 《海岸工程》2000,19(3):39-45

介绍了浙江东南沿海的台州市及所属玉环县、温州市及所属乐清市、瓯海区等地面实施海洋“蓝色工程”的丰富实践和新鲜经验。文中借鉴浙东南沿海大开发的成功经验,结合我国东部沿海其它地区特别是苏北沿海的实际,提出了做出滩涂开发利用、发展海洋经济的总体战略构想。  相似文献   

软土海岸地区测量控制点标志的设立     

苏衍坤  李新国  朱绪伟  苏衍国 《海洋测绘》2007,27(3):43-47

分析了软土、湿地、滩涂地区特殊地理环境对测量控制点的影响;主要探讨了此类地区控制点标志的设计、施工。借助于建筑桩基技术和道桥施工方法,首次成功实现了某三角洲湿地滩涂地区统一布网。几年来,结合滩涂湿地测量、海岸防护和滩涂开发工程对部分控制点进行了初步检测,给出了部分检测数据。应用和检测均表明:桩基标石可较好地解决软土、湿地、滩涂地区控制点布设难题,显著提高软土海岸地区测量控制点标志的稳固性,从而延长控制网的可使用期。  相似文献   

夏季长江冲淡水转向机制分析   总被引：7，自引：0，他引：7  

廖启煜  郭炳火  刘赞沛 《海洋科学进展》2001,19(3):19-25

利用 1 95 9,1 975 - 1 982年及 1 998年夏季各月黄、东海盐度分布和相应风场资料 ,分析讨论了长江冲淡水夏季的扩展路径。指出 :除海底坡降外 ,由 S向的苏北沿岸流和 N,NE向的浙东沿岸流及台湾暖流构成的“力偶”,是使冲淡水向左扭转的重要外力之一。用近岸均质模型和远岸双层模型的涡度方程定性讨论了冲淡水的转向机制  相似文献   

海洋石油污染及其生物修复   总被引：1，自引：0，他引：1  

刘金雷  夏文香  赵亮  马庆奎 《海洋湖沼通报》2006,(3):48-53

文章根据海洋油污染的现状,介绍了海洋石油污染的来源、危害、转归以及对污染的生物修复等内容。指出了限制微生物降解的因素以及如何提高降解效率的措施。生物修复对环境和人类影响小,修复速度快且费用较低,在海洋油污染治理中该方法具有广阔应用前景。  相似文献   

A GIS-based step-wise procedure for assessing physical exposure in fragmented archipelagos     

Jan Ekebom  Pasi Laihonen  Tapio Suominen 《Estuarine, Coastal and Shelf Science》2003,57(5-6):887-898

Wind and waves are major forces affecting the geomorphology and biota in coastal areas. We present a generally applicable method for measuring and calculating fetch length, fetch direction and wave exposure. Fetch length and direction, measured by geographic information system-based methods, are used along with wind direction and wind speed data to estimate wave height and period by applying forecasting curves. The apparent power of waves approaching the shore, used as a proxy for wave exposure, is then calculated by a linear wave model. We demonstrate our method by calculating fetch lengths and wave exposure indices for five areas with varying exposure levels and types of meteorological conditions in the Finnish Archipelago Sea, situated in the northern Baltic Sea. This method is a rapid and accurate means of estimating exposure, and is especially applicable in areas with geomorphologically varying and complicated shorelines. We expect that our method will be useful in several fields, such as basic biogeographical and biodiversity research, as well as coastal land-use planning and management.  相似文献