共查询到10条相似文献,搜索用时 31 毫秒
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由于世界金属价格的下跌、联合国海洋法会议规定的繁琐条文以及对结核采矿可行性过于乐观的设想 ,使得勘探深海锰结核的首次尝试以失败告终。随后注意力又集中到海山的富钴锰结壳上。 2 0世纪 80年代中期以来 ,人们寄希望于一些长期的计划以确立深海锰结核采矿的可行性。这些计划则需本国政府的大力资助。近年来海底热液矿物也引起人们的关注。自1 983年以来 ,一些学者就对离散板块边缘的海底热液矿物资源潜力产生了一定的兴趣 ,其中对红海中部亚特兰蒂斯二号深海海底的沉积物矿产进行过有关其商业潜力的最详细评价。该矿床是迄今已知海洋规… 相似文献
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20 0 1年 4月 2 4日设在土阿木土群岛 (法国在太平洋南部的领土 )朗伊罗阿环礁上的“波普里奥里奥”地震测站测到了海底的“爆炸”。由塔希提岛 (法属波里尼西亚 )波马达依地球物理实验室的工作人员完成的地震波分析表明 ,它们的源头位于马里亚纳群岛范围内 ,其地理坐标约为 2 0 3°W和 1 45°E(± 1 5km)。在这个地区的海底分布着奥依海脊 ,其顶部位于海平面以下 1 40m。正是由于奥依海脊的火山活动才造成 1 979年捕渔船的船员注意到该区出现了不一般的海浪以及海水的变色 ,并伴有强烈的硫磺味。从奥依海脊向西分布着帕哈罗斯火山岛(其另… 相似文献
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Seafloor Properties From Penetrometer Tests 总被引:3,自引:0,他引:3
Quasi-static and freely falling dynamic penetrometers are currently in extensive use for measuring the mechanical properties of sediments composing the littoral seafloor. Sediments in this zone are often inhomogeneous both laterally and with depth so that it is difficult to predict burial of mines and other objects when relying on models that assume uniform, homogeneous sediment. The results of penetrometer tests discussed in this paper show that there can be a wide spread in the penetration resistance that is measured depending on the degree of sediment inhomogeneity and the rate of penetration. Moreover, the dilative response of granular strata appears to further complicate matters because of the sudden, large changes in shear strength that can occur. As a result, mine burial models currently in use, which often rely on simple strain-rate factors and shear strength determined from experiments utilizing uniform, reconstituted sediment, do not appear to be adequate to handle real in situ conditions in many cases. The objective of this paper is to obtain a better understanding of in situ properties and how they may be incorporated into various burial models. 相似文献
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