排序方式： 共有6条查询结果，搜索用时 15 毫秒
1
1.
Jiangsu has the most abundant tidal flat resources among China's coastal provinces.To ease the conflict between the growing population and shrinking usable land and to promote regional sustainable development,large-scale coastal reclamation development activities have been performed in Jiangsu Province since 1949.The present study has integrated multi-source remote sensing images during 1974 to 2012 by using a Multi-point Fast Marching Method(MFMM) to extract the Jiangsu coastal reclamation areas for different time periods.The temporal and spatial patterns of the extent and elevation of the reclamation areas were analysed in order to determine the unused potential for future reclamation.It will provide information necessary to support the development and construction of tidal flats in Jiangsu.Results show that:(1) the reclaimed tidal flats along the Jiangsu coast cover more than 19.86×104 hm2,of which 13.97×104 hm2 is located in Yancheng,4.84×104 hm2 in Nantong,and 1.05×104 hm2 in Lianyungang;(2) the average elevation of the reclaimed Jiangsu tidal flats has gradually decreased over the last 40 years,while those in Dongtai and Rudong have showed particularly accelerated decrease since the 1990s;and(3) in 2012,very few unused tidal flats two meters above the sea level are left along the Jiangsu coast,and mainly concentrated in Yancheng.As there are still reserving some coastal land resources between 0-2 m,providing us with a potential for future development.All of these findings may be useful for researchers and local authorities for the development and utilization of tidal flat resources in Jiangsu. 相似文献
2.
Jiangsu has the most abundant tidal flat resources among China’s coastal provinces. To ease the conflict between the growing population and shrinking usable land and to promote regional sustainable development, large-scale coastal reclamation development activities have been performed in Jiangsu Province since 1949. The present study has integrated multi-source remote sensing images during 1974 to 2012 by using a Multi-point Fast Marching Method (MFMM) to extract the Jiangsu coastal reclamation areas for different time periods. The temporal and spatial patterns of the extent and elevation of the reclamation areas were analysed in order to determine the unused potential for future reclamation. It will provide information necessary to support the development and construction of tidal flats in Jiangsu. Results show that: (1) the reclaimed tidal flats along the Jiangsu coast cover more than 19.86×104 hm2, of which 13.97×104 hm2 is located in Yancheng, 4.84×104 hm2 in Nantong, and 1.05×104 hm2 in Lianyungang; (2) the average elevation of the reclaimed Jiangsu tidal flats has gradually decreased over the last 40 years, while those in Dongtai and Rudong have showed particularly accelerated decrease since the 1990s; and (3) in 2012, very few unused tidal flats two meters above the sea level are left along the Jiangsu coast, and mainly concentrated in Yancheng. As there are still reserving some coastal land resources between 0?2 m, providing us with a potential for future development. All of these findings may be useful for researchers and local authorities for the development and utilization of tidal flat resources in Jiangsu. 相似文献
3.
基于AHP和EWCM的部分南沙岛礁战略价值模糊综合评价 总被引：2，自引：0，他引：2
以模糊综合评价法为基础,构建岛礁战略价值评价指标体系与综合评价模型,采用层次分析法确定权重系数,运用熵权系数法进行权重修正,通过矩阵运算,定量评价马欢岛、费信岛、南钥岛、中业岛、北子岛、西月岛、双黄沙洲和司令礁8个岛礁的战略价值,为我国制定海洋发展战略、区域行动计划提供科技支撑和辅助决策。结果表明,一级评价指标的权重由高到低依次为自然条件、建设情况、地理位置、资源控制、战略潜力;二级评价指标中权重较高的有礁盘面积、平均高程、淡水资源、陆地距离、航线距离、辐射岛礁数、机场、建筑、人口;参与评价的南沙岛礁战略价值呈明显的梯度分布特征,中业岛最高,马欢岛次之,北子岛、西月岛、司令礁较低,费信岛、南钥岛、双黄沙洲最低。 相似文献
4.
南海占我国海洋国土的2/3,不仅是中国国家安全的天然屏障和重要的出海口与战略通道,而且是我国未来重要的能源接续区与资源基地、地缘政治经济问题的多发区。对南海争端发展态势进行空间分布与关联性GIS分析,是重要的辅助决策支持。结果表明:(1)文献研究和网络爬虫等方法可以快速有效地获取南海争端历史地理数据,GIS技术能够对南海争端历史地理数据进行时空变化的深入分析;(2)就争端事件的时间分布而言,事件数量随时间推进呈现显著增长,个别发生重大南海争端事件的年份出现突增的现象;(3)就争端事件的空间分布而言,与越南及菲律宾相关的南海争端事件尤甚,其他周边国家则相对较少,这主要源于越菲两国的战略利益与南海所在区域交叠,使得越菲不断挑起事端;(4)越南、菲律宾与马来西亚等国的利益诉求区主要位于南沙群岛,各国诉求区分布明确,局部交错。网络GIS技术丰富了历史地理研究的途径,为其提供了新的思路和方法。 相似文献
5.
基于JASON-1资料的南海海域海面风、浪场特征分析 总被引：1，自引：0，他引：1
南海海域地形复杂,风浪多变,由极端的水文气象条件引起的大风、巨浪等海况灾害频发,对航道运输、石油开发、海岸工程、军事活动等造成一定的影响.研究基于2002年1月15日至2012年2月15日共372周期的JA-SON-1 GDR数据,采用克里金插值法分析南海海域海面风速和有效波高的时空分布特征和季节变化规律,运用核密度估计法提取大风和巨浪灾害的高发区域,为航道运输安全和海洋工程建设等提供参考.结果表明,南海海域年均海面风速和有效波高皆从东北向西南方向呈舌状高值区,并逐渐向外减小;季均海面风速和有效波高均呈现秋冬高、春夏低的变化规律;大风高发区多集中于南海东北部海域、台湾海峡和吕宋海峡附近;巨浪高发区则位于东沙群岛以南、中沙群岛以北、西沙群岛以东、菲律宾以西这一海域. 相似文献
6.
选取南沙海域被越南非法侵占的29个岛礁的法律地位、军事基地潜力、水域通达性、岛礁资源价值、陆地联系紧密度与区域战略潜力等主要因素构建指标体系,采用主客观综合赋权的方法——层次分析法(AHP,Analytic Hierarchy Process)-变异系数法,定量评价越南侵占的我国南沙岛礁战略价值。研究结果表明:(1)越占岛礁价值最高的为南子岛,其次是南威岛,目前越南对其开发程度均较高;(2)战略价值较高的鸿庥岛、景宏岛等岛礁离我国控制的部分南沙岛礁距离较近,对我国战略防御构成威胁。另外西礁战略价值较高,已成为南沙旅游开发景点之一;(3)战略价值较低的金盾暗沙、奥南暗沙等目前受自身开发条件限制较大,但蕴藏着极大的油气潜力。以上越占岛礁战略价值分析结果,将为维护我国固有领土完整,为解决中越南沙争端提供支持。 相似文献
1