古地理学报2018，Vol.20Issue(2)：263-270,8.DOI:10.7605/gdlxb.2018.02.019
新疆额尔齐斯河边滩砾石定向性特征及其意义
Orientation of Irtysh River point bar gravels and its significance in Xinjiang
摘要
Abstract
In this paper,the rosette diagram and Curray's research method were used to study the orientation of gravels at 20 observation points in the Irtysh River point bar.It was found that the long axis of gravels in the study area had a directional arrangement,and the optimal direction was parallel to the flow direction of Irtysh River.However,the oriention of gravels was also influenced by other factors.Grain support mode affected gravels orientation in some degree,e.g.,the multi-size particles supported gravels showed the best oriention,followed by particles support.The strength of water also had an influence on gravels orientation.The long axis of the gravels was perpendicular to the flow direction under the weak hydrodynamic force.When the hydrodynamic force became strong,the long axis of the gravels would be parallel to the flow direction.The orientation characteristics of the gravels are also related to their grain size.If the hydrodynamic force was weak,the long axis of smaller gravels (grain size less than 2 cm) was perpendicular to the flow direction and the larger gravels (with grain size greater than 2 cm) were parallel to the flow direction.However,when the hydrodynamic force became strong,the influence of the gravels size on orientation characteristics could be negligible.Therefore,when using long axis of gravel to determine the palaeo direction of flow,it is better to take into consideration other factors first,such as palaeoclimate and hydrodynamic force in the study area,and then a more accurate recovery of the relationship between river flow and the long axis of gravels can be obtained.Finally,you can determine the palaeo-flow direction of the study area comprehensively.关键词
新疆/额尔齐斯河/砾石定向性/定量表征/河流沉积/古流向Key words
Xinjiang/Irtysh River/gravel orientation/quantitative characterization/fluvial deposits/palaeo-flow direction分类
天文与地球科学引用本文复制引用
黄远光,张昌民,丁雲,王绪龙,瞿建华,胡慧,安志渊..新疆额尔齐斯河边滩砾石定向性特征及其意义[J].古地理学报,2018,20(2):263-270,8.基金项目
国家科技重大专项(编号:2016ZX05027-02-007)、国家自然科学基金项目(编号:41772094)与国家自然科学基金青年基金(编号:41702116)联合资助.Co-funded by National Science and Technology Major Project (No.2016ZX05027-02-007),National Natural Science Foundation of China (No.41772094) and National Natural Science Foundation of China (No.41702116) （编号:2016ZX05027-02-007）
