韩国南极国家行动:动因、举措及策略          下载免费PDF全文

吴伦 《极地研究》2016,28(3):381-389

南极地区位于地球的最南端,其独特的地理位置和自然环境一方面推迟了人类对其争夺和改造,另一方面也积累和形成了特殊的资源储量和战略价值。在物质资源日益匮乏的今天,南极作为尚待开发的新边疆,其战略意义日渐突显。韩国在南极有着广泛而特殊的利益,为了实现这些利益,改变后发参与的不利局面,韩国在南极科研、政治、经济等领域采取了诸多积极举措,并且形成了一套灵活务实的策略。随着国内外形势的发展,韩国未来将制定正式的南极政策文件,在原有实践基础上加大参与力度,并充分发挥企业的支援作用,实现国内优势向国家能力的转换,从而更好地推进其南极战略。  相似文献   

Numerical Simulation and Analysis of Storm Surges Under Different Extreme Weather Event and Typhoon Experiments in the South Yellow Sea     

ZHANG Mingzong  ZHOU Chunyan  ZHANG Jisheng  ZHANG Xinzhou  TANG Zihao 《中国海洋大学学报(英文版)》2022,21(1):1-14

In this study,a coupled tide-surge-wave model was developed and applied to the South Yellow Sea.The coupled model simulated the evolution of storm surges and waves caused by extreme weather events,such as tropical cyclones,cold waves,extratropical cyclones coupled with a cold wave,and tropical cyclones coupled with a cold wave.The modeled surge level and significant wave height matched the measured data well.Simulation results of the typhoon with different intensities revealed that the radius to the maximum wind speed of a typhoon with 1.5 times wind speed decreased,and its influence range was farther away from the Jiangsu coastal region;moreover,the impact on surge levels was weakened.Thereafter,eight hypothetical typhoons based on Typhoon Chan-hom were designed to investigate the effects of varying typhoon tracks on the extreme value and spatial distribution of storm surges in the offshore area of Jiangsu Province.The typhoon along path 2 mainly affected the Rudong coast,and the topography of the Rudong coast was conducive to the increase in surge level.Therefore,the typhoon along path 2 induced the largest surge level,which reached up to 2.91 m in the radial sand ridge area.The maximum surge levels in the Haizhou Bay area and the middle straight coastline area reached up to 2.37 and 2.08 m,respectively.In terms of typhoons active in offshore areas,the radial sand ridge area was most likely to be threatened by typhoon-induced storm surges.  相似文献   

The 'Grasses' of the Big Scrub District of North-eastern New South Wales: A sedimentary record of late Holocene grasslands in a subtropical forest landscape     

W.E. Boyd  B.J. Stubbs  C. Averill 《The Australian geographer》1999,30(3):331-336

This paper records sedimentary data which indicate that at least part of the Wilsons River floodplain, on the margins of the subtropical rainforest known as the 'Big Scrub', has a long and certainly pre-European history of relative treelessness. Despite a general presumption that this lowland subtropical region was completely forested prior to European settlement, recent historical research has indicated that certain areas were naturally open. While the historical information is clear, the data reported here-a fossil pollen record and one radiocarbon date- reinforces that information for one type of locality, providing an initial indication of time depth.  相似文献   

Exploitation or 'Wise Use' of the Coongie Lakes,South Australia: Issues arising from a petroleum exploration proposal     

Thomas Jenkin 《The Australian geographer》1999,30(3):355-371

The exploitation of natural resources within areas that are valued for their environmental qualities raises competing emotions. This paper considers a proposal to undertake petroleum exploration in an area of recognised environmental value, namely, the Coongie Lakes of far north-east South Australia. In development cases such as this, the level of inquiry needs to address environmental, social, cultural and economic issues from a range of interest groups; therefore, the process of assessment is a crucial factor in minimising conflict and meeting the wishes of the stakeholders. In the example of Coongie Lakes, the chosen method failed. This paper discusses the perspectives of the major stakeholders, the process of assessment undertaken, and the criticisms directed at this process. The apparent inadequacies of the assessment process undertaken are then highlighted, and an alternative assessment procedure suggested.  相似文献   

中国南方地区土地退化动态变化及人类活动影响   总被引：22，自引：3，他引：19  

卢金发 《地理科学进展》1999,18(3):215-221

中国南方典型研究区50 年代和80 年代土地退化的对比分析表明, 近几十年来, 不同人类活动地区土地退化变化呈现出各自不同的特点, 土地退化发展最严重的地区既不是人口密度较小和经济较落后的基岩山区,也不是人口密度大、经济发达和土地开垦程度高的低丘岗地区, 而是人口增长速度较快, 经济不够发达的低山丘陵地区。  相似文献   

海岸沙丘沙运动特征若干问题的研究——以闽江口南岸为例     

陈方  贺辉扬 《中国沙漠》1997,17(4):355-361

在海岸带,沙粒粒径和水分含量是决定沙粒起动风速的最主要因素。闽江口南岸海滩沙的平均粒径为2.0Φ,水分含量多在0.3%~1.0%之间。运用Johnson的经验公式,可计算出海滩沙的起动风速为6~7m/s。这一结果与实际观测值十分吻合。由于海岸环境因素的影响,使得同等条件下海岸带沙粒的起动风速明显大于内陆沙漠沙,而风沙流的输沙率明显小于内陆沙漠沙。海岸带是风速剧变带,在引用陆地气象台站的风速记录分析海岸风况和研究风沙运动规律时,必须对风速进行订正。  相似文献   

论华南喷流—沉积块状硫化物矿床   总被引：28，自引：1，他引：27  

徐克勤  王鹤年  周建平  朱金初 《高校地质学报》1996,2(3):241

现代海底喷流－沉积硫化物矿床的发现极大地推动了海底热液成矿理论的发展,也大大地提高了对古代海底喷流块充化物矿术的研究水平。本文指出喷流－沉积是重要的成矿作用,提出喷流－沉积矿床是华南Ｃｕ、Ｐｂ、Ｚｎ、Ｓｎ、Ａｇ、Ａｕ等矿产资源的重要来源,形成了一批超大型矿床,并将华南许多曾被认为属夕卡岩矿床重新确认为喷流－沉积岩床。文章还论述了华南喷流－沉积块状硫化物矿床的特征、分类、时空分布及其成矿特点等问题,提出断裂拗陷带型喷流－沉积块状硫化物矿床是华南具有特色的类型,而陆相断陷盆地中喷流－沉积矿床值得进一步深入研究。  相似文献   

滇西南云县三叠纪火山岩组合及系列的厘定及其构造意义   总被引：3，自引：2，他引：1  

朱勤文  何昌祥 《现代地质》1993,7(2):151-159,T001

本文重新厘定了云县三叠纪火山岩的组合和系列,识别了4个层位中的酸性熔结凝灰岩,重新划分了火山喷发旋回和韵律。中三叠统忙怀组(T_2m)为富硅富铝高钾流纹质火山岩组合,该旋回由5个喷发韵律层组成;上三叠统小定西组(T_3x)为高钾玄武岩-钾玄岩-安粗岩及火山碎屑岩组合,该旋回由6个喷发韵律层组成。芒汇河组(T_3mh)为钾质粗面玄武岩-高钾流纹质火山岩组合,该旋回由6个喷发韵律层组成。T_2m火山岩属碰撞型弧火山岩,T_3x和T_3mh火山岩属钾玄岩系列火山岩,具有滞后型弧火山岩之属性。  相似文献   

南黄海陆架区15ka以来的古气候事件与环境演变   总被引：10，自引：0，他引：10  

孟广兰  韩有松  王少青 《海洋与湖沼》1998,29(3):297-305

于１９８６－１９９４年间,陆续对南黄海７个柱状样品进行了孢粉分析研究,结合＾１４Ｃ测年数据,参考古地磁、热释光测年等分析资料,以其中３个主要岩芯剖面资料为代表,论述了南黄海陆架区１５ｋａ以来的古气候环境演变。结果表明,在第四纪末次冰期冰消期中,气候曾剧烈波动,并逐渐由晚冰期向冰后期过渡。这一演变特点与全球气候背景下的中国东部地理环境相关。同时识别出３个短期降温和两个升温事件：其中Ａ１亚带冷期出现在  相似文献   

南海表层水温年循环的数值模拟   总被引：8，自引：0，他引：8  

王东晓 《海洋学报》1998,20(4):25-37

本文采用一个非线性约化重力海洋模式对南海表层水温(SST)年循环过程进行了数值研究,探讨了南海表层水温年循环形成和维持的动力学和热力学机制·模拟结果表现出与观测分析相一致的年循环变化阶段性和空间结构,并发现南海SST年循环的阶段性是海面动力强迫和热力强迫共同作用的结果;南海上层海洋的热力平衡有着明显的季节特征.  相似文献