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差异水动力导致黄河口粉质土微结构分形特征变化实例研究 总被引：8，自引：0，他引：8
在黄河三角洲北部潮坪上选择典型研究区。区内通向油井的道路的修建使北侧水动力条件明显强于南侧。对两侧原状土样进行粒度成分测试和微观结构观测，并利用分形理论进行分析。结果发现，在水动力作用强区中，粒度分维值随深度的变化曲线大致呈反“S”型，颗粒分布分维值随深度单调递增(表层除外)，颗粒定向性分维值随深度的变化曲线呈“S”型；在水动力作用弱区，粒度分维值和颗粒分布分维值随深度单调增大，颗粒定向性分维值随深度的变化曲线呈平缓的反“S”型。这些参数的变化较好地反映了不同深度处沉积物的层化现象。 相似文献
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海面水温与台风关系的分形分析 总被引：1，自引：0，他引：1
本文用分形方法分析了西北太平洋５３个坐标点１９４９－１９７５年多年逐月平均海面水温资料，结果表明西北太平洋逐月平均海面水温呈分形分布，而且其分维数Ｄ与台风总数有关，即Ｄ值高的月份台风总数也多。 相似文献
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The fractal characteristic change in the Huanghe River Estuary due to the hydrodynamic conditions’ variation 总被引：4，自引：0，他引：4 
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下载免费PDF全文 Abstract-The study area lies in the subaqueous delta, which came into being in 1964～1976. Oneoil-field road has been built for exploring petroleum to form a wave barrier. The hydrodynamic conditionson the north side of the road are relatively violent, on the contrary the hydrodynamic conditions on thesouth side of the road are nearly placid. This makes the study area a natural laboratory for studying theinfluence of the hydrodynamic conditions on the fractal characteristics of the tidal flat. Selecting an areais named Case Ⅰ on the side of stronger hydrodynamic activities and an area is named Case Ⅱ on the otherside. Measuring the topography and sampling and analyzing the granulometrical comoposition, it is foundthat the hydrodynamic conditions have fatal influence on the surface fractal dimensions and the granulo-metrical fractal dimensions of the area. In Case Ⅰ, which has strong hydrodynamic conditions, the sur-face fractal dimensions are obviously large than those of Case Ⅱ, and the granulometr 相似文献
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The probability of fractal determination of coastal types based on GIS is preliminarily discussed with China as an example. Finally, some significant conclusions are drawn: (1) The fractal dimension of coastline of the bedrock coast is larger than that of the plain coast on the same scale map; (2) As far as the bedrock coast is concerned, the larger fractal dimension of coastline of the bedrock coast on the same scale map indicates that the bedrock coast is probably not typical; (3) As far as the plain coast is concerned, the smaller fractal dimension of coastline of the plain coast on the same scale map indicates that it is probably the silt plain coast; (4) The different substantial compositions affect the fractal dimensions of coastlines of different coastal types. In general, the coast which lies in the north of the Hangzhou Bay consists of sand mainly, its surface is flat, and it is connected with the coastal plain, its landform is broad shoal, its total change is comparatively homogenous in the tidal dynamic process, and thus, the relatively smaller fractal dimension of coastline results from this. For the bedrock coast, there is more bedrock, the coastline is comparatively smooth and straight, being affected by the faults and ocean dynamic process, which result in the larger fractal dimension. 相似文献
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研究区位于1964～1976年黄河由刁口流路入海时形成的三角洲潮坪．为进行石油开采在潮坪上构筑的交通设施对波浪形成了良好的屏障，水动力条件具有显著差异的屏障两侧潮坪是研究潮坪特征对水动力条件响应的天然实验场所．在屏障两侧各选择一典型区，实测地貌形态，取样品进行粒度成分分析，根据实测资料分析确定潮坪分形特征．发现水动力环境的强弱决定着潮坪的形貌、沉积物粒度分维值的变化规律．水动力环境强的一侧潮坪滩面分维值高，且随着初始计算网格宽度增大迅速降维；表层沉积物粒度分维值小，且离散性大．相反，在另一侧潮坪滩面分维值低，且随着初始计算网格宽度增大分维值无显著变化；表层沉积物粒度分维值高，且具有较好的一致性．当初始计算网格宽度增大到某个值时，两侧潮坪形貌分维值渐趋一致．在屏障两侧各沿一条与屏障大角度相交的测线取样，并各选择一点采取不同深度的样品做分析计算，发现在水动力条件弱的一侧，样品的粒度分维值表现为远离屏障逐步降维、随深度增加分维值增大的规律；相反一侧粒度分维值变化的规律性很不明显．讨论了水动力环境对潮坪分形特征影响机理。 相似文献
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分形方法分析和预测月平均海面水温 总被引：5，自引：0，他引：5
本文用分段变维分形方法分析了西北太平洋３０°Ｎ、１２５°Ｅ坐标点处１９４９～１９７５年各年月平均海面水温资料，给出各年分形分布的平均分线数Ｄ．应用分形方法还给出了某些情况下适用的，根据任一点处１～８月月平均海面水温预测９～１２月月平均海面水温的方法． 相似文献
