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41.
42.
基于清代、民国期间多种历史文献中的风、雨、潮现象和“颶、颱”记载重建了1644~1911年影响今华东浙、沪、苏的台风频率序列 F 清代史料中记载了该区受263次台风影响,年均0.98次。功率谱和小波分析显示18世纪中期至20世纪初,4 a周期表现最为明显. F 与Nino3指数基本对应,反映出入境华东的台风对极端ENSO事件并不敏感,强LaNina年和强ElNino年入境本区的台风频率基本相同。研究时段内,在多年代际尺度上,北半球及中国东部地区的增暖会增加影响华东沿海的台风发生频率 相似文献
43.
相对于钙法、氨法脱硫技术,海水脱硫在脱硫、脱氮效果、一次性投入、综合运行费用和避免二次污染方面有一定优势,在我国沿海电厂具有广阔的应用前景。本文重点介绍了海水脱硫技术,并对福建省今后SO2减排治理工作提出了建议。 相似文献
44.
Maanan M 《Environmental pollution (Barking, Essex : 1987)》2008,153(1):176-183
Mussels (Mytilus galloprovincialis), clams (Venerupis decussatus) and oysters (Crassostrea gigas) were sampled seasonally during 2004-2005, from different coastal environments of Morocco in order to measure their accumulated heavy metal concentrations. The concentrations of Hg and Pb were determined by AFS and ICP-MS methods, respectively, whilst the remaining metals (Cd, Cr, Cu, Mn, Zn and Ni) were quantified by AAS. The soft tissue concentrations of the mussels were on average 7.2 mg kg(-1) (Cd), 9.6 mg kg(-1) (Pb), 0.6 mg kg(-1) (Hg), 26.8 mg kg(-1) (Cu), 8.8 mg kg(-1) (Cr), 292 mg kg(-1) (Zn), 20.8 mg kg(-1) (Mn) and 32.8 mg kg(-1) (Ni). The highest tissue heavy metal concentrations were recorded in the south from the industrial area of Jorf Lasfar. The relationships between metal concentration and season in each species showed very similar annual profiles with a peak observed around spring-summer. Statistical analysis indicated that different species showed different bioaccumulation of metals depending on study site and season. 相似文献
45.
不同类型海岸的溢油清理方法 总被引:1,自引:0,他引:1
世界石油资源分布和需求的不均衡性,促进了海上石油工业和石油运输业的快速发展,同时也增加了溢油事故的几率.海上溢油污染问题日趋严重,溢油污染对海洋环境、生态、资源、经济及人类生产生活等造成了巨大的影响,日益引起社会各界的关注.海岸溢油污染清理实践表明,正确的溢油清理方案的制定应综合考虑海岸的敏感性指数、溢油的类型、清理方法可能带来的危害以及支际可操作程度等.对包括盐沼地海岸和红树林海岸,沉积海岸,以及岩石海岸三类典型海岸的国内外现有海岸溢油污染清理技术进行了详细的综述,以期为我国的海岸带管理和溢油应急计划的制订提供技术参考. 相似文献
46.
借鉴美国加州南岸空气质量预报经验,特别是其运行管理模式对于现阶段中国城市环境空气质量预测预报具有极高的参考价值。简要介绍了加州南岸空气质量管理局(SCAQMD)空气质量预报业务流程、技术方法、信息发布方式和预报效果评估策略。建议从4个方面借鉴SCAQMD经验:(1)建立相对完善的空气质量预报体系,分层级自上而下指导预报工作;(2)选择合适的空气质量预报方法,综合统筹成本-效益评估工作;(3)评估预报效果进而提高预报准确率;(4)在优化空气质量预报能力的基础上,有序开展预警协同控制工作。 相似文献
47.
1IntroductionChinahasalongcoastalline.Since1980’,economyincoastalareashasbeendevelopingfast,alongwiththeincreasingpopulation.... 相似文献
48.
49.
Anthony E. J. 《Journal of Coastal Conservation》1997,3(1):169-178
Beach conservation and management on the high-value French Riviera in southeastern France have had mixed fortunes in shoreline
economic development strategies over the past half century. Prior to 1965, socio-economic growth related to immigration and
tourism resulted in considerable pressure on the coastal zone, leading in particular to beach erosion and degradation of beach
environmental quality. Between 1965 and 1980, over 20% of the 132 km-long French Riviera was permanently altered through the
implantation of yachting harbours and reclamation fill structures, while beach-based recreation had a rather low ranking as
a development choice, except in the two major resorts of Cannes and Nice which exhibit a densely urbanized seafront. On this
preponderantly boldrocky coast, the mediocre recreational value inherited by many of the beaches from the regional geologic
setting, and from development pressures and earlier errors in coastal management, left them vulnerable to appropriation and
so-called ‘valorization’ by yachting harbour and estate developers.
Over the last decade, artificial shoreline development has virtually ceased, in response to several more or less interrelated
factors. These include relative stagnation of socio-economic growth, increasing development and maintenance costs of yachting
harbours, saturation of the yachting harbour market as a result of the burgeoning of new, often cheaper, resorts and of reconversion
of commercial and shipbuilding ports to leisure ports in the Mediterranean, more stringent legislation, since 1986, on the
implantation of residential and major engineering structures on the coastline, pressure for conservation of the cultural and
environmental heritage, and greater demand for beach recreational space. This situation has forced a diversification of shore-based
activities, as it has been realised that better managed beaches may balance economic aspirations while contributing to enhanced
environmental quality and sensible shoreline conservation. This change in strategy has entailed considerable efforts and money
on the improvement of coastal water quality, the provision of amenities for beach-goers, and especially the nourishment of
eroding beaches and the creation of several artificial beaches. The extent to which beaches will continue to play a role in
the sustainable development of French Riviera resorts will depend largely on the capacity of local authorities to maintain
environmental quality in the face of inherited and persistent handicaps such as beach erosion. 相似文献
50.
Freshly deposited surface sediments from the Alexandria coastal zone were collected and analysed in 1995 for their trace metal concentrations. Metal concentrations in the sediments vary between sites within a wide range for copper, zinc, iron, lead, chromium and cadmium. the statistical analysis between the metal concentrations and the different constituents (organic carbon, total nitrogen, silt, clay and total iron) showed significant correlations. the enrichment factors for the sediments ranged between 3 and 4-fold for copper, chromium and zinc and reached up to 9-fold for lead and 113-fold for cadmium. the highest index for cadmium and lead may be attributed to the anthropogenic inputs from the surrounding area, where they are highest in lower discharge areas. 相似文献