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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
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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
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南海地理位置重要,自然资源丰富。为维护南海领海主权与国家利益,需要加强对南海诸岛的有效管理与经营。南海海域热带风暴频发,热带风暴带来的灾害严重危害岛礁的经营建设和人民生命安全。以1977—2012年热带风暴数据为基础,通过缓冲区分析和空间拓扑分析等方法分析了南海海域及其岛礁近35 a来受热带风暴影响的状况及规律,以期为国家在经营管理南海诸岛时规避热带风暴灾害提供依据。研究结果表明:1东沙群岛至中沙群岛一带洋面(18°N~21°N,116°E~122°E)是南海海域受热带风暴影响最频繁的地区;2热带风暴对南海岛礁的影响主要集中在夏秋两季(6—11月);3在南海诸岛中,东沙群岛受热带风暴影响最为严重,其次是中沙和西沙群岛,而南沙群岛受热带风暴的影响相对较小。 相似文献
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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
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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
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