Monitoring of impact of anthropogenic inputs on water quality of mangrove ecosystem of Uran,Navi Mumbai,west coast of India     

《Marine pollution bulletin》2013,76(1-2):291-300

Surface water samples were collected from substations along Sheva creek and Dharamtar creek mangrove ecosystems of Uran (Raigad), Navi Mumbai, west coast of India. Water samples were collected fortnightly from April 2009 to March 2011 during spring low and high tides and were analyzed for pH, Temperature, Turbidity, Total solids (TS), Total dissolved solids (TDS), Total suspended solids (TSS), Dissolved oxygen (DO), Biochemical oxygen demand (BOD), Carbon dioxide (CO₂), Chemical oxygen demand (COD), Salinity, Orthophosphate (O-PO₄), Nitrite–nitrogen (NO₂–N), Nitrate–nitrogen (NO₃–N), and Silicates. Variables like pH, turbidity, TDS, salinity, DO, and BOD show seasonal variations. Higher content of O-PO₄, NO₃–N, and silicates is recorded due to discharge of domestic wastes and sewage, effluents from industries, oil tanking depots and also from maritime activities of Jawaharlal Nehru Port Trust (JNPT), hectic activities of Container Freight Stations (CFS), and other port wastes. This study reveals that water quality from mangrove ecosystems of Uran is deteriorating due to industrial pollution and that mangrove from Uran is facing the threat due to anthropogenic stress.  相似文献   

Transnational Urbanism in Port of Spain: Returning Middle-Class Urban Elites     

《Urban geography》2013,34(5):700-727

Port of Spain, Trinidad offers an ideal context in which to analyze pre-retirement return migration to a Global South urban realm, expanding transnational urban research beyond the conventional focus on Global North metropolitan destinations. In this article, we draw on the transnational narratives of a selected sample of relatively youthful Trinidadians, who have spent many years abroad acquiring education and professional experience, but who have then decided to return in mid-career to the capital region of the island nation of their birth, or of their parent(s). Theoretically, we position these returning professionals as members of a "middling" transnational urban class whose return is at least partly motivated by a desire to "make a difference." Our results contribute to a growing literature that documents the role of transnational middle-class urban elites returning elsewhere in the Carribbean: "middling" transnational urbanism is reshaping key facets of urbanization in the Global South.  相似文献   

Perspectives for Hamburg as a port city in the context of a changing global environment     

Iris Grossmann 《Geoforum》2008,39(6):2062-2072

During recent decades, most European river-port cities and also many seaport cities have undergone a major transition towards a service-centred, rather than industrially-based metropolis, offering a high quality urban environment with a revitalised waterfront. Hamburg is one of the few river-port cities that have chosen the course of port expansion instead. This paper discusses the consequences of current global technological, organisational and economic developments for the port. Changing requirements imply rising monetary and land-use costs and environmental and social impacts, and also entail the risk that the port may not be able to fulfil new requirements and could thus lose market shares to coastal competitors. More importantly, the world-wide economic shift towards the service sector has affected port-dependent jobs in two ways: Directly port-dependent jobs have been reduced to a fraction, while many indirectly port-dependent jobs no longer require physical proximity of the port. Those benefits that continue to arise tend to spread over a much larger geographical region, while the port’s costs remain locally concentrated. Given the increasing competition between world-wide metropolitan regions that seek to establish themselves in new sectors and attract a qualified workforce, it is particularly relevant for Hamburg to account for these changes and to incorporate an assessment of the port’s changing costs and benefits into planning processes. To date, this task has received little attention from the city.  相似文献   

基于力学平衡模型的长三角港口物流发展协调性研究   总被引：1，自引：0，他引：1  

叶士琳  曹有挥  蒋自然  王佳韡 《地理科学》2017,37(11):1624-1631

基于港口物流协调发展理论分析框架,构建相应的综合评价指标体系和协调性判别模型,对长三角13个港口物流发展协调性进行综合评判。结果表明：长三角已形成较为明显的以上海港为核心,宁波-舟山港、苏州港和南京港为副中心,其余港口为重要补充的多层次港口物流规模等级结构;港口物流协调发展层次总体偏低,以低水平协调型为主,且港口物流发展协调度与综合发展度间存在紧密联系,呈现明显的“U”型曲线特征;港口物流协调发展偏离方向集中化特征不明显,制约不同港口物流协调发展的主要因素存在较大区别,同时就物流运营发展滞后型、城市支撑发展滞后型和基础设施发展滞后型港口分别提出改进方向。  相似文献   

射阳港双导堤建设环境影响后评价     

汤倩  闫玉茹  李梦颖 《江苏地质》2021,45(4):433-437

为治理河口拦门沙,实施了通过整治及疏浚的方式打通拦门沙的射阳港双导堤工程,导堤的功能定位为“导流、挡沙、减淤”。通过对江苏盐城射阳港海岸动力地貌等环境的调查,分析研究射阳港区不同时期的水下沉积物分布特征、不同历史时期的水下地形特征,同时研究不同时期的水质、底质沉积物、生态群落等指标数据,对射阳港双导堤建设的环境影响进行后评价。研究认为：双导堤工程完工后导堤口区域出现明显冲刷,导堤两侧出现淤积,颗粒变细,但对水质环境、底质沉积物环境和生态环境的影响不大,双导堤工程建设对环境影响的风险可控。  相似文献   

Upwelling and ocean structures off Algoa Bay and the south-east coast of South Africa     

《African Journal of Marine Science》2013,35(4):525-536

As the Agulhas Current flows along the south-east coast of South Africa, a number of processes operate that bring cold, deep water up onto the narrow shelf. As a consequence, upwelling along the coastline is enhanced farther southward and downstream. This situation is investigated off Algoa Bay and along the south-east coast to Port Alfred, where measurements demonstrate that marked temperature variability occurs at the coastline, particularly in summer when temperature structures are more intense and easterly-component winds more common. There is no indication that upwelling is more prevalent at Port Alfred; increasing variability farther south is evident at Woody Cape/Cape Padrone, where the coastline veers westwards, forming the eastern boundary of Algoa Bay. Here it is found that, after a wind change to north-easterly, cold water is upwelled along the shoreline between 19 hours and 2.5 days later. Such upwelling progresses north-eastwards with the movement of the wind and weather systems, although colder water also moves south-westwards into Algoa Bay. Winds, currents, sea level and sea temperatures are highly correlated, with fluctuations in sea level measuring >50 cm being associated with coastal trapped waves (CTWs). Such barotropic wind-driven CTWs are frequently active during upwelling, although it is unclear whether there is any interaction between the two phenomena.  相似文献   

江苏洋口港区雷电特性及风险区划   总被引：2，自引：1，他引：1  

冯民学  焦雪  钟颖颖  于波  苗甫生 《气象科学》2012,32(1):86-93

利用洋口港区所在的江苏如东县地面观测站1959—2009年的雷暴日资料和洋口港区2006年1月—2009年12月的闪电定位数据,对港区雷电活动的时空分布特点和变化特征进行统计分析,揭示了洋口港区雷电发生的规律:闪电集中在6—8月份,港区陆地的闪电密度高于水域,而海上的闪电强度高于陆地。并通过计算气象指标、地物环境指标、承灾体的风险指标和建筑物的防护指标,对洋口港区人工岛进行雷击风险计算和雷击风险区等级划分,得出人工岛干散货及杂货作业区为高风险区,液体散货罐区和LNG接收站区域为中等风险区,公共设施区为低风险区,整个人工岛的雷击风险综合等级为中等。  相似文献   

Econometric analysis on the effect of port state control inspections on the probability of casualty: Can targeting of substandard ships for inspections be improved?     

Sabine Knapp  Philip Hans Franses 《Marine Policy》2007

This article is based on 183,819 port state control inspections from various port state control regimes and casualties from three different data sources for a time period of 6 years. It is the first time an analysis on a combined dataset of this magnitude has been performed. Binary logistic regression is used to measure the effect of inspections on the probability of casualty, which can be measured for very serious casualties but not for serious or less serious casualties. In addition, the magnitude of improvement areas for targeting substandard vessels is determined and the models further show how targeting of substandard ships on a combined dataset can be improved. In addition, the analysis also compares the fishing fleet with the commercial fleet.  相似文献   

可编程增益放大器在海洋环境监测中的应用及其接口     

余家栋 《海洋科学》1989,13(2):33-37

文中提出一种性能优良的单片集成数字增益设定器LFl3006/7,它与集成运算放大器组成可编程增益放大器PGA电路,也可组成具有二进制或者十进制等不同增益档次的程序可测控的仪表放大器。微机系统通过接口电路对它实施智能式的增益切换,优化了仪器测量的动态范围和精度,这对人们无法手动干预的环境监测或海洋遥测过程有特殊的意义。  相似文献   

上海港与周边港口的国际竞争策略   总被引：7，自引：0，他引：7  

许长新  徐杏等 《海洋工程》2001,19(2):92-96

世界航运中心从大西洋转向了太平洋，东亚地区已成为国际集装箱运输的核心区域。随着该地区各集装箱港口的发展，大家都在努力争夺新的国际航运中心的地位。与上海港直接竞争的是釜山港、神户港和高雄港。本文分析了三港以及上海港的有关情况，通过设置有关的港口国际竞争力的指标，对上述四个港口在软硬件方面的竞争情况作了比较。文章最后给出了港口动态竞争模型，通过对8该模型的建立，阐述了各港口应采取的竞争与合作战略。  相似文献