摘要
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。
The study area was selected on the northern tidal flat of the Yellow River delta and the construction of road going to the oil well made the hydrodynamics stronger on the north side of the road than on the south side. The grain size analysis and microstructure observation of the undisturbed soil samples from both sides of the road were made, and the fractal theory was used to analyse the soil sample. It is shown from the analysis results that in the strong hydrodynamic action area, the variational curves of granularity fractal dimension value with depth are largely reverse S-shaped, the grain distribution fractal dimension values increase with increasing depth (except the surface layer), and the variational curves of grain directional fractal dimension value with depth are S-shaped; in the weak hydrodynamic action area, the granularity fractal dimension values and the grain distribution fractal dimension values increase with increasing depth, and the variational carves of grain directional fractal dimension value with depth are gently reverse S-shaped. The variations of these parameter values well reflect the stratification phenomenon of sediments at different depths.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2004年第2期177-183,共7页
Advances in Marine Science
基金
国家自然科学基金资助项目--黄河口水下斜坡硬壳形成与破坏(40172088)
山东省自然科学基金资助项目--黄河口潮坪的分形特征描述(Q99E10)
关键词
黄河口
粉质土
微结构
水动力
粒度分维值
颗粒分布分维值
颗粒定向性分维值
Yellow River estuary
silty soil
microstructure
hydrodynamics
granularity fractal dimension value
grain distribution fractal dimension value
grain directional fractal dimension value
