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南海珠江口盆地陆架斜坡及大陆坡海底沙波动态分析 总被引:21,自引:2,他引:19
探索陆架与陆坡海底动力地貌演变规律,不仅是学科理论发展上的重要研究课题,同时也是国土开发和研究海洋工程环境的需要。文中基于作者提出的床面稳定中的“准共振界面波”理论模式,针对南海北部“卫滩幅”地区海床微地貌在水动力条件作用下的现况进行了初步分析,得出水深80~250m海底小尺度沙波的形成机理与室内水槽和天然海滩上的沙纹沙丘的形成同属一个规律,这一推论已得到该地区现场资料的初步验证。文中最后还就现有同行专家的研究成果估算了上述地区沙波的移动趋势。 相似文献
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本文主要是探索二元推进余波作用下,含沙浓度沿水深的分布规律问题。 通过试验研究导出,在平衡挟沙条件下,含沙浓度沿水深的分布公式。并由此解释了在实际中可能出现的三种分布情况:(1)表层 相似文献
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二维泥沙数学模型的理论基础及其应用 总被引:4,自引:1,他引:3
本文提及的二维泥沙数学模型是基于前人的有关研究成果,结合作者对泥沙运动力学新的见解及在水力计算中所构造的分岔支流和“加密”模型等一系列模式计算方法建立起来的. 经工程初步验证表明,模型的实践效果比较好. 相似文献
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The Haihe cohesive sediment, which is typical in China, is studied systematically for its basic physical and incipient motion properties. Following the requirements of dredging works in the Haihe Estuary, cohesive sediment samples were taken from three locations. Laboratory experiments were conducted to delermine the rheological properties of these samples and to examine the incipient motion of the cohesive sediment. it is found that the cohesive sediment has an obvious yield stress τb, which increases with the mud density in a manner of an exponential function, and so does the viscosity parameter η. The cohesive sediment behaves like a Bingham fluid when its density is below 1. 38 - 1 .40 g/cm3 , and when denser than these values, it may become a power-law fluid. The incipient motion experiment also revealed that the incipient velocity of the cohesive sediment increases with the density in an exponential manner. Therefore, the incipient motion is primarily related to the density, which is different f 相似文献
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