塞拉利昂近海主要渔场与渔船产值的分析     

任一平  高天翔  江永辉  周先标 《中国海洋大学学报(自然科学版)》2000,30(4)

根据塞拉利昂近海 16条生产船一年的生产日志资料 (1995年 7月～ 1996年 6月 ) ,分析了近海渔场渔区产值分布 ,指出 2区、4 4区、84区、97区为主要的经济渔区 ,主要渔汛时间为 6～ 8月。同时 ,还对渔获物的结构组成及渔轮的月平均单船产值进行了比较分析。  相似文献   

曹妃甸深水港址开发研究     

张素娟 《地理与地理信息科学》2000,16(1):79-82

论述曹妃甸港址开发的比较优势和建设前景,分析该港址具有天然的深水优势和突出的地理区位优势,蕴育着巨大的开发潜力。港口建设和临港产业带开发,将对环渤海以及北方地区经济发展产生极大的带动作用。  相似文献   

连云港西大堤工程建设影响作用评价   总被引：4，自引：0，他引：4  

徐军 《海洋通报》2005,24(5):67-73

西大堤的建成使连云港由原来的海峡通道型港口变为半封闭的人工海湾型港口,风浪条件改善,可利用的港口岸线大大加长,为连云港亿吨大港的建设提供了契机,也改善了连云港与东西连岛的交通条件,促进了旅游业的发展.另一方面,也改变了海湾内水动力与沉积环境.大堤建成后,湾内潮波由前进波转变为驻波,水体交换能力减弱,湾内水质污染加重,尤其是湾顶水域污染最重;同时加剧了湾内泥沙的淤积,在西大堤内侧形成新的潮滩,位于湾顶的老海滨浴场被淤废.由于西大堤封堵了连云海峡西口门,使得近岸泥沙的运移路径改变,北部的泥沙流自海州湾东去沿大堤折向东西连岛方向,在大堤的外侧和东西连岛外缘形成新的落淤场所,大沙湾和苏马湾海滨浴场受到影响.沉积作用的加剧已影响到港口及周边海岸与水利设施的正常运作,因而应加强对港区及周边海洋环境的监测与研究,缓建西大堤内侧北港区码头,并对西大堤西端进行透空式改造,以从根本上解决港区泥沙淤积问题.  相似文献   

基于Boussinesq波浪模型的港池波浪数值模拟与泊稳分析     

吴亚楠  武贺  周庆伟  马勇 《海洋通报》2021,40(3)

基于Boussinesq方程的MIKE21-BW模型,建立等水深、双突堤式的波浪数值港池,采用不同的波浪入射方向和双突堤口门宽度,分别对波浪经双突堤后的绕射情况进行模拟。根据《港口与航道水文规范》中的计算参数和突堤绕射系数结果,对BW模型进行率定和验证,结果表明二者吻合度较好,可以较好地描述港池的泊稳状况。在此基础上,利用MIKE21-BW模型对秦皇岛某港口防波堤工程的不同布局方案进行模拟计算和泊位稳定性分析,提出了工程设计方案建议。  相似文献   

结合无人船与网络RTK技术测量露天矿坑土方量     

吉绪发 《测绘通报》2019,(7):151-155

利用无人测量船与网络RTK技术联合测量某一涵盖水陆区域的填挖土方量。其中，利用无人船系统测量水下地形，利用网络RTK测量陆地地形，并将水陆两部分的地形数据融合，利用基于不规则三角网的DTM法计算了该区域的填挖土方量，同时得到水域部分的水下地形图，为后续施工建设提供了基础资料。本文提出的结合无人船和网络RTK技术测量复杂水陆地形的方案可为相关工程的测量实践提供参考依据。  相似文献   

黄骅港地区潮滩过程与港口选址   总被引：2，自引：0，他引：2  

石青峰  吴桑云  王文海 《海岸工程》2005,24(4):17-26

对黄骅地区潮滩过程的基本特征进行了讨论,结果表明,该区潮滩发育主要受黄河泥沙的控制,黄河从本区或其附近入海期间是潮滩迅速淤涨期,当黄河远离本区时,潮滩便开始退缩进入调整期。目前本区潮滩过程的主要物质是潮滩本身的沉积物。漳卫新河的来沙是本区的主要物源。本潮滩的潮下带宽达9km以上,破波带外界在约4．0m水深处,港址选在泥沙活跃的破波带内是值得商榷的。建议港口建设应尽量避开破波带．  相似文献   

青岛奥运场馆后续功能开发及利用     

于定勇  李晶  刘华兴 《海岸工程》2005,24(1):75-81

总结了后奥运时期奥运设施综合利用的经验教训,简介了2008年青岛奥帆赛奥运会场馆建设项目;逐一分析了青岛奥运工程单体建筑的后续功能,提出了奥运会后开发的具体设想。  相似文献   

A recent history of metal accumulation in the sediments of Rijeka harbor, Adriatic Sea, Croatia   总被引：2，自引：0，他引：2  

Neven Cukrov  Stanislav Fran?iškovi?-Bilinski 《Marine pollution bulletin》2011,62(1):154-167

We studied metal pollution in the sediments of Rijeka harbor, including anthropogenic influence during recent decades and at the present time. Sediment profiles were collected at ten sampling points. The concentrations of 63 elements in bulk sediment were obtained using ICP-MS, and the concentrations of selected elements were evaluated by statistical factor analyses. We also calculated metal-enrichment factors and geoaccumulation indices and constructed spatial-distribution maps.Mercury (Hg) was the heaviest pollutant, with concentrations exceeding 4 mg/kg. Silver (Ag) was the second most important pollutant, with constantly increasing values. The average concentrations of the most toxic elements were comparable to those found in sediments of other ports throughout the world, and their toxicity ranged from threshold values [chromium (Cr), arsenic (As)] and midrange-effect values [cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni)] to extreme-effect values (Hg). Metal pollution has decreased during recent decades, except for Ag and barium (Ba).  相似文献   

Holocene coastal change in the ancient harbor of Yenikap?-?stanbul and its impact on cultural history     

Oya Algan  M. Nam?k Yalç?n  Yücel Y?lmaz  Elmas K?rc?-Elmas  Özlem Bulkan  Cem Gazio?lu  Mehmet Ali Polat 《Quaternary Research》2011,76(1):30-45

An extensive rescue excavation has been conducted in the ancient harbor of ?stanbul (Yenikap?) by the Sea of Marmara, revealing a depositional sequence displaying clear evidence of transgression and coastal progradation during the Holocene. The basal layer of this sequence lies at 6 m below the present sea level and contains remains of a Neolithic settlement known to have been present in the area, indicating that the sea level at ~ 8-9 cal ka BP was lower than 6 m below present. Sea level advanced to its maximum at ~ 6.8-7 cal ka BP, drowning Lykos Stream and forming an inlet at its mouth. After ~ 3 cal ka BP, coastal progradation became evident. Subsequent construction of the Byzantine Harbor (Theodosius; 4th century AD) created a restricted small basin and accumulation of fine-grained sediments. The sedimentation rate was increased due to coastal progradation and anthropogenic factors during the deposition of coarse-grained sediments at the upper parts of the sequence (7th-9th centuries AD). The harbor was probably abandoned after the 11th century AD by filling up with Lykos Stream detritus and continued seaward migration of the coastline.  相似文献   

Theoretical Analysis of Harbor Resonance in Harbor with An Exponential Bottom Profile   总被引：2，自引：0，他引：2  

王岗  郑金海  梁秋华  张蔚  黄诚 《海洋工程》2015,29(6):821-834

The general features of oscillations within a rectangular harbor of exponential bottom are investigated analytically. Based on the linear shallow water approximation, analytical solutions for longitudinal oscillations induced by the incident perpendicular wave are obtained by the method of matched asymptotics. The analytic results show that the resonant frequencies are shifted to larger values as the water depth increases and the oscillation amplitudes are enhanced due to the shoaling effect. Owing to the refraction effect, there could be several transverse oscillation modes existing in when the width of the harbor is on the order of the oscillation wavelength. These transverse oscillations are similar to standing edge waves, and there are m node lines in the longshore direction and n node lines running in the offshore direction corresponding to mode (n, m). Furthermore, the transverse eigen frequency is not only related to the width of the harbor, but also to the boundary condition at the backwall and the bottom shape.  相似文献