共查询到20条相似文献，搜索用时 46 毫秒
1.
2.
海岛独立分散于海域,其经济必须依托陆域与外界进行物质和信息交换而发展,海岛与陆域的区位关系对海岛经济发展模式的形成起着决定作用.石城岛和獐子岛均属辽宁省大连市,是长山群岛中两个具有典型区位特征的海岛,经过长期发展,石城岛从单一的渔业经济转向依托庄河港发展海洋港口经济,而獐子岛基于渔业资源优势大力发展以集体经济为主导的渔业经济.通过两者的比较研究,可见依托内陆地区是海岛经济可持续发展的根本,区位优势是海岛经济可持续发展的基础,生态保护是海岛经济可持续发展的保障. 相似文献
3.
Statistical features of eddies approaching the Kuroshio east of Taiwan Island and Luzon Island 总被引：1，自引：0，他引：1
Yu-Hsin Cheng Chung-Ru Ho Quanan Zheng Bo Qiu Jianyu Hu Nan-Jung Kuo 《Journal of Oceanography》2017,73(4):427-438
This study examined the statistical features of eddies approaching the Kuroshio east of Taiwan Island and Luzon Island. In total, 315 eddies (138 anticyclonic and 177 cyclonic eddies) were detected from 19.5 years of satellite altimeter sea-level data, with more than 95% of these eddies being generated in the ocean west of the Mariana Islands. Eddy trajectory statistics indicated that eddies frequently intrude into the Kuroshio regime at two latitude bands, namely 18°N–19°N and 22°N–23°N, with periods of 146 ± 62 and 165 ± 46 days, respectively. The interaction time is longer within the two active bands (33 ± 10 days at 18°N–19°N and 45 ± 17 days at 22°N–23°N) than at other latitudes. These two eddy-intrusion bands are associated with the northern and southern Subtropical Countercurrents (STCCs). These STCCs have a vertically reversed sign of the meridional potential vorticity gradient, thus providing a key energy source for eddy generation. In addition, when westward-propagating eddies approach the Ryukyu Islands, the southwestward recirculation flow east of the island chain as well as topographic effects cause some eddies to head southwestward to the east of Taiwan and intrude into the Kuroshio at 22°N–23°N, rather than to dissipate directly. Therefore, we suggest that the STCCs play a key role in inducing the eddies to frequently intrude into the Kuroshio at 18°N–19°N and 22°N–23°N. In addition, the Ryukyu Islands are responsible for concentrating the eddies within 22°N–23°N. 相似文献
4.
5.
Sea level rise could bring about an event that has not previously been seen in modern history, that of the physical disappearance of some low-lying Island States. The objective of this paper is to examine what are the likely scenarios for some of these islands in the course of the next century, and analyse for each scenario if these Island States could continue to claim an Exclusive Economic Zone or not. Also, it will analyse the possibility that Island States could continue having some sort of status analogous to statehood even if it was to lose all territory. Finally, the idea of a “government-in-exile” will be discussed, where the State could retain its identity waiting for a future re-emergence of the island. 相似文献
6.
D. G. McKnight 《新西兰海洋与淡水研究杂志》2013,47(3):324-326
Four asterozoans—Ophidiaster confertus H. L. Clark, Acanthaster sp., Axiognathus squamata (Delle Chiaje), and Ophioplocus imbricatus (Muller and Troschel) taken near Norfolk Island are new records for this poorly known locality. 相似文献
7.
L. J. Poppe M. L. DiGiacomo-Cohen S. M. Smith H. F. Stewart N. A. Forfinski 《Geo-Marine Letters》2006,26(2):59-68
Multibeam bathymetric data and seismic-reflection profiles collected in eastern Long Island Sound and western Block Island Sound reveal previously unrecognized glacial features and modern bedforms. Glacial features include an ice-sculptured bedrock surface, a newly identified recessional moraine, exposed glaciolacustrine sediments, and remnants of stagnant-ice-contact deposits. Modern bedforms include fields of transverse sand waves, barchanoid waves, giant scour depressions, and pockmarks. Bedform asymmetry and scour around obstructions indicate that net sediment transport is westward across the northern part of the study area near Fishers Island, and eastward across the southern part near Great Gull Island. 相似文献
8.
菜坨子岛位于大连市长海县,为无居民海岛,功能定位为渔业用岛。依据无居民海岛生态系统的特点和渔业用岛功能定位,文章使用压力-状态-响应模型设置3层指标体系,对菜坨子岛生态状况进行评价。指标评价方法采用专家评价法及单因子环境质量指数法、综合评价指数法等计算各级权重值和指标值。基于2015年现场调查数据,采用层次分析法对压力-状态-响应模型进行计算,得出菜坨子岛年生态状况分值及评价结果。结果表明,菜坨子岛总体状态为“优”（分值为0.811 1）。此外,经过对评价指标进一步优化后,可将该评价方法推广到对其他渔业用无居民海岛的生态状况评价,为其开发和保护提供依据。 相似文献
9.
海南岛海岸环境特征 总被引：8，自引：0，他引：8
海南岛虱热带季风岛屿型气候，为南海大陆架岛屿，中央为山地，临海为多种类型海岸，以处于动态平衡的海蚀-海积型海岸为主。海南岛主要是基岩岬湾海岸，潮汐属日潮型，东部与南部为不规则日潮混合潮。海岸构造运动与气候变化的双重影响，更新世初期，海岸属基岩港湾型，晚更新世构造运动频敏，使不少海湾底部抬升为阶地。构造抬升运动持续到全新世，使一些珊瑚抬升为高出海面数米的阶地。海岸类型按其成因与形态可分为两大类：基岩港湾海岸与砂砾质平原海岸。基岩港湾海岸分布于山地与丘陵临海处，砂砾质平原海岸（或为三解洲平原海岸）其表现形式多为沙坝与泻湖海岸，沙坝上叠置发育着海滩、沙堤或沙丘，随着海岸加积展宽或地壳上升，老的沙坝可抬高成为海积阶地。潮流作用对洪湾众多的海南岛的发育演变以及开发利用亦有重要作用。潮汐汊道港湾规模较大，水域面积达数十平方公理。 相似文献
10.
《African Journal of Marine Science》2013,35(1):383-386
During the period April 1991–March 1996, 10 entangled Antarctic fur seals Arctocephalus gazella, 28 entangled Subantarctic fur seals A. tropicalis and one entangled southern elephant seal Mirounga leonina were observed at Marion Island, Southern Ocean. Entanglement of fur seals was estimated at between 0.01 and 0.15% of the combined population of both species. 相似文献
11.
12.
海岛生态旅游开发模式的研究有助于成熟海岛目的地开发新产品增加新收入,也有助于新进入者获得市场先发优势,对无居民海岛旅游开发具有启发意义。文章通过对国内外海岛生态旅游理论和实践研究及实地走访,提出海岛生态旅游的五大特征;依照开发活动对海岛生态系统干扰程度由低到高,将其开发模式依次分为严格的、中等的和不严格的模式;对山东长岛进行案例实证研究,对比不同开发模式的优劣势,建议山东长岛采用严格的生态旅游开发模式,实施以海洋野生动物为核心的生态旅游带动海岛自然旅游的差异化战略,获得海内外市场,并促进当地经济、社会和生态的可持续发展。 相似文献
13.
巴勒尼群岛沿着南极洲维多利亚地延伸达1 6 0km ,并向北延伸到新西兰海底山脉的南端。其中最南部的是斯特尔岛 (长 44km)。起码在最近半个世纪 ,岛上未见到喷发。在其他海岛中 ,记录到火山活动的有巴基岛 ( 1 83 9和1 899年 )和杨岛 ( 1 83 9年 )。2 0 0 1年 6月 1 2日 ,美国华盛顿冰况观测中心的EuDowling在研究罗斯海中的冰况时 ,根据来自卫星“NOAA 1 4、NOAA 1 5和NOAA 1 6”的资料 ,发现了面积达 2 0× 2 0 0km2 的异常云彩 ,其底部边缘悬挂在斯特尔岛上空。其顶部位于近 6 0 0 0m的高空 ,主要由冻结的水汽组成 (温度为 -5 3℃ )… 相似文献
14.
15.
《Deep Sea Research Part I: Oceanographic Research Papers》1999,46(4):715-731
A series of hydrographic stations north and south of Easter Island (27′10′S, 109′20′W), Chile, were sampled between 22 and 23 May, 1994. The hydrography measured was consistent with basin-scale studies and showed a surface mixed layer that ranged between 80 and 115 m depth and had temperature and salinity values typical of autumn subtropical waters (22′C in temperature and 35.85 in salinity). The hydrography indicated the presence of two water masses in the vicinity of the island: the eastern South Pacific Central Water and the Antarctic Intermediate Water. Nutrient concentrations in general were lowest at the surface, over a layer that was deeper than the density mixed layer, and increased with depth. The appearance of salt fingers within the eastern South Pacific Central water mass was suggested by the positive vertical gradients of temperature and salinity, by the rough steps in the temperature and salinity profiles, and by the low and positive density ratios combined with Turner angles between 70′ and 80′. The density field indicated the development of geostrophic flows that were consistent with the eastern portion of the subtropical gyre of the South Pacific and with the surface dynamic topography of the period of observations. Due to the presence of the island, the large-scale north-northwestward geostrophic flows were reversed at spatial scales comparable to the size of the island. 相似文献
16.
永兴岛及七连屿造礁石珊瑚近10年变化分析 总被引：2，自引：1，他引：2
根据2007-2016年珊瑚礁监测数据，永兴岛及七连屿共调查到造礁石珊瑚11科113种，常见种有鹿角杯形珊瑚Pocillopora damicornis、疣状杯形珊瑚Pocillopora Verrucosa、粗野鹿角珊瑚Acropora humilis、澄黄滨珊瑚Porites lutea、丛生盔形珊瑚Galaxea fascicularis、梳状菊花珊瑚Goniastrea pectinata及锯齿刺星珊瑚Cyphastrea serailia等。研究区域内造礁石珊瑚种类近10年（2007-2016年）来下降明显，其中永兴岛从39种下降到18种，下降率为53.85%；北岛从23种下降到17种，下降率为26.09%；赵述岛从46种下降到12种，下降率为73.91%；西沙洲从51种下降到15种，下降率为70.59%。群体形态群落中皮壳状种类数最为稳定，分枝类下降了59.26%；叶片状下降了75.00%；圆盘状下降了87.50%；团块状下降了57.14%。通过对研究区域造礁石珊瑚种类组成及群落形态等方面的变化分析可见，人为活动、长棘海星、珊瑚病害、台风及全球升温等因素逐渐影响到西沙海域的珊瑚礁生态系统。 相似文献
17.
18.
无居民生态岛建设评价体系初步构建——以大洲岛为例 总被引：1，自引：0，他引：1
《中国海洋大学学报(自然科学版)》2016,(3)
无居民海岛生态环境特殊且具有其重要价值和地位,对无居民生态岛建设评价的研究,有助于更好地实现中国海岛的生态保护和有序开发。本文以PSR模型为指标框架,参考国内外各类生态评价指标,采用文献分析法、德尔菲法、模糊评价法等方法逐步筛选适合指标,初步建立包括生态风险、生态现状、生态保障为主系统层的包含9个评价指标的无居民生态岛建设评价指标体系,并将大洲岛作为典型案例进行示范评价。结果表明:该指标体系的评价结果能够较好的反映大洲岛的生态建设状况,具有较强的实际意义与较好的实践应用价值。 相似文献
19.
F. J. Taylor 《新西兰海洋与淡水研究杂志》2013,47(2):389-402
Ten samples of freshwater from Campbell Island were analysed for their main ionic constituents. All show a preponderance of sodium and chloride derived from sea water. Potassium, calcium, and magnesium gave slightly higher concentrations than would be expected if derived solely from sea water. It is con‐eluded that the excess potassium is derived from the underlying rocks and soil, and the excess calcium and magnesium from the sea by fractionation into salt particles. 相似文献
20.