山东沿海港口自然资源评价   总被引：2，自引：0，他引：2  

杨鸣 《海岸工程》1997,(4)

港口资源在海岸带开发利用中是极为宝贵的资源。本文根据山东海岸的各种自然条件和已建港的岸线使用情况，通过综合分析，对山本省海岸带的港口资源进行了评价。  相似文献   

锦州港潮流悬沙淤积模型试验研究     

董凤舞  徐敏福  郭瑞祥 《海洋工程》1994,(1)

本文首先分析了锦州湾的自然条件，明确了风浪掀沙和潮流输沙是引起港池和航道淤积的主要原因并得到了海水含沙量与风、浪、潮的定量关系，为确定模型中应施放的特征含沙值提供了依据。文中首次将窦国仁全沙模型相似理论应用于海湾潮流泥沙模型并取得了成功。验证试验表明，模型中潮位、潮流速、流向、含沙最分布，淤积强度分布，淤积量和淤沙粒径级配等均与原型基本一致。利用此泥沙模型对锦州港各期工程方案的淤积量和淤积强度分布进行了预报并对今后港口扩建工程布置提出了建议。  相似文献   

厦门港湾柱样沉积物的孢粉组合特征     

于永芬  陈承惠 《台湾海峡》1995,(1)

本文根据厦门港湾12个柱样沉积物的抱粉分析结果，划分出三个饱粉带，探讨了其沉积环境与古气候演化史。Ⅲ榛属－藜科－水龙骨科带，以榛和草本为主，表明为稀树草原植被和温凉干燥气候，陆相沉积，形成于晚更新世晚期至早全新世；Ⅱ栎属、栲属、栗属一水龙骨科带，表明为繁盛的常绿阔叶林和茂密的灌木草本植被，气候最湿润暖热，为冰后期海面最高时期，海相沉积，形成于中全新世；I松属－禾本科－蕨属、水龙骨科带，由成类、草本和针叶树组成，表明主要为针叶树和栽培植被，气候转为暖干，现代沉积，即晚全新世。  相似文献   

芦潮港车客渡码头水域近期强势淤涨原因辨析     

贺松林  劳治声 《海洋学研究》1999,17(1):13-19

叙述了１９９３年前的芦潮港车客渡码头水域自然水深条件和１９９３年后强烈淤涨的态势,从诸事件的时间之窗及水下滩坡适应性调整、长丁坝促淤效应等方面讨论了该水域强势淤涨的原因,提供了一个海岸工程产生淤积响应的典型实例。海岸带（尤其在沉积环境响应敏感的区域）开发必须注重社会经济效益与环境效益的统一。  相似文献   

3D hydrodynamic characterisation of a meso-tidal harbour: The case of Bilbao (northern Spain)     

Manel Grifoll  Almudena Fontán  Luis Ferrer  Julien Mader  Manuel González  Manuel Espino 《Coastal Engineering》2009

A background knowledge of marine dynamics helps harbour managers to control pollution and to manage dredging and traffic operations. This contribution studies the hydrodynamic conditions within Bilbao Harbour, which is enclosed by the Nervión Estuary (in the Basque Country, Spain). The results obtained from hydrographical surveys are compared with numerical simulations obtained using the Regional Ocean Modelling System (ROMS). Hydrodynamic modelling was carried out to determine the inner harbour currents for a specific period in which data were available. Then, numerical experiments were designed in order to quantify the importance of different driving mechanisms in the harbour hydrodynamics. The results show that, in addition to the strong tidal influence on water circulation, the wind forcing and freshwater discharge also have a non-negligible influence on the currents. The computational domain is complex due to the presence of harbour infrastructures (i.e. breakwaters and piers). As a result, topographic eddies are therefore observed in the results. The freshwater influence of the Nervión river can also be observed in residual currents. This paper presents an improvement to the application of numerical modelling to a complex geometry domain, contributing to our understanding of the behaviour of the marine systems in meso-tidal harbours. This can be used to deal with harbour engineering and management problems.  相似文献   

Erosion and accretion rates and their associated sediment characters along Ras El Bar coast,northeast Nile Delta,Egypt     

Mahmoud M. El Banna 《Environmental Geology》2007,52(1):41-49

Beach profile data, covering the coast of Ras El Bar, northeast Nile Delta, collected during the years from 1990 to 2002 combined with landsat images for the area and sedimentological investigation have been used to identify beach and nearshore seafloor sediment changes. Along the coast of Ras El Bar, two accretion sectors and one of erosion have been recognized. The first accretion sector is located west of Damietta harbour, where the harbour jetties have halted the littoral transport, while the second one is behind a system of detached breakwaters protecting Ras El Bar resort. Both the two sectors are characterized by growing shoreline with maximum rates ∼15 and 10 m/year, respectively. Also, they have maximum nearshore seafloor accretion rates of ∼18 and 22 cm/year, respectively. The erosion sector is located east of Damietta port and has a maximum rate of shoreline retreat ∼−10 m/year. Erosion of its nearshore seafloor is indicated recording a maximum rate of ∼−20 cm/year. The rate of net sediment volume change in the area indicates shifting of the accretion sector (II) westward, responding to installation of the new breakwaters unit. The two accretion sectors are characterized by dominance of moderately sorted fine sands in their shore area which change seaward into less sorting very fine sands. Beach sands of the eroded sector are poorly sorted medium grain size. The dominant constituents of heavy mineral species in beach and sea-bottom sands are the characteristic assemblages of the Nile deposits. The sands of the eroded zone are relatively enriched in monazite, zircon, tourmaline, garnet, and rutile.  相似文献   

Geoarchaeological evidence for dredging in Tyre's ancient harbour, Levant     

Nick Marriner 《Quaternary Research》2006,65(1):164-171

Chrono-stratigraphic data from Tyre's ancient northern harbour delineate extensive dredging practices during the Greco-Roman and Byzantine periods. Radiocarbon dates from four cores consistently cluster between ca. 500 B.C. and 1000 A.D. and indicate rapid rates of sedimentation in the basin, namely ∼10 mm/yr during the Greco-Roman and Byzantine periods, compared to 0.5-1 mm/yr for the period 6000-4000 B.C. Absence of strata between 4000 B.C. and 500 B.C. is not consistent with a natural base-level sediment sink and cannot be interpreted as a depositional hiatus in the high-stand systems tract. Ancient dredging is further corroborated by persistent age-depth inversions within the fine-grained harbour facies. These data support removal of Middle Bronze Age to Persian period sediment strata, with deliberate overdeepening of the harbour bottom by Greco-Roman and Byzantine societies.  相似文献   

港建工程海域悬浮颗粒物及其生态效应研究     

孙廷庆  刘红军 《中国海洋大学学报(自然科学版)》2014,44(8):89-96

于2011年5月~2012年4月,对正在建设港口及其邻近海域环境进行为期一年的监测,研究港口建设引起的悬浮物变化,及其对海域重金属污染物和生物群落的影响。研究结果表明:(1)海域悬浮物的变化范围为1.2~147.5mg/L,底层悬浮物含量显著高于表层,悬浮物含量受季节自然因素和工程建设人为因素的双重影响;(2)水体中重金属含量呈现升高趋势,与悬浮物含量变化的关系不明显;(3)海域浮游植物密度和群落特征指数均较低,甲藻比例明显增加;浮游动物密度和各群落特征相对正常;底栖生物面临较大压力。  相似文献   

Response of benthic opportunistic polychaetes and amphipods index to different perturbations in coastal oligotrophic areas (Canary archipelago,North East Atlantic Ocean)     

Rodrigo Riera  Jose Antonio de‐la‐Ossa‐Carretero 《Marine Ecology》2014,35(3):354-366

Oligotrophic areas harbour low macrofaunal abundance and patchy distribution. In these areas it is necessary to test the reliability of biological indicators, especially those based on taxonomic sufficiency where the level of identification is balanced against the need for ecological information and could affect the efficiency of bioindicators. The BOPA (benthic opportunistic polychaetes and amphipods) index was applied in five coastal areas subjected to different perturbations (aquaculture, harbour, brine, sewage, and thermal pollution) in the Canary archipelago, an oligotrophic area of the Atlantic Ocean. Significant differences in the BOPA index between impact and control sites were only found in the area affected by a harbour. Perturbations such as aquaculture, brine or sewage discharge produce only a weak response of the BOPA index, whereas no effects were observed at thermal pollution‐impacted locations. The BOPA index should be used with caution to establish the ecological status of coastal water bodies in the Canary Islands, since it was only reliable in strongly impacted regions (enlargement harbour works), but did not respond clearly to other man‐induced perturbations.  相似文献   

环渤海地区港口与城市关系的动态测度及驱动模式研究   总被引：2，自引：0，他引：2  

郭建科  杜小飞  孙才志  王泽宇 《地理研究》2015,34(4)

港城交互作用是港口城市形成、演化并实现可持续发展的关键因素,因此,如何测定港城关系并从中揭示港城交互作用的模式是港口城市研究的一个难点问题.一直以来,港城关系中港口功能与城市功能定量分析方法以及港城互动关联机制的研究比较薄弱.在RCI基础上,提出DCI的概念、内涵及其算法,并以此为基础,对环渤海地区主要海港城市的港城关系状况及DCI值动态变化趋势进行定量测度,并运用脉冲响应函数对港城驱动模式进行系统分析,揭示不同港口城市在港城相互作用方面的具体差别与联系,丰富地理学对于港城关系内在机理的认识.结果显示:环渤海地区12个海港城市港城关系状况可以分为港口驱动型、城市驱动型和港城稳定型三类;变动趋势可以分为持续上升型、持续下降型及波动型三类;港城交互作用机制及稳定性存在明显差别.港城关系的强弱或倾向性与港口或城市规模没有直接关系,而是与港口或城市发展阶段、港口与腹地的关系等深层次问题密切相关.  相似文献