Simulation experiment of anastomosing multiple channel formation
文献类型：会议论文
| 作者 | Wang S. J. |
| 出版日期 | 2004 |
| 关键词 | anastomosing river simulation experiment flume multiple channels floodplain evolution central australia sedimentation-rates cooper creek river canada morphology evolution patterns system basin |
| 页码 | 1747-1753 |
| 英文摘要 | The anastomosing river is a fluvial river pattern that recently gets more and more attention from researchers. The hydrological, geomorphologic and sedimentological characteristics of some anastomosing rivers have been revealed. But the experiment simulation of anastomosing rivers is vacant hitherto. The flume simulation experiments are the reappearance of natural rivers under the condition of decreasing time and space. This work reports the formation and evolution of an anastomosing river simulated in the flume. The experimental beginning condition is: an artificial meandering channel in the assistant area of flume; a rectangle floodplain (4.5 m x 16.5 m) with concave cross sections is in the objective area and its stratum has a structure of double layers. The upper layer with a thickness of 1.5 cm consisted of Gaoling which median grain size is 0.013,2 mm; the under layer, consisted of fine sands which median grain size is 0.188 mm, has a thickness of 0.5 m. The mean longitudinal gradient of the floodplain is 0.005,8 from 5.5 m to 17 rn and 0.007,7 from 17 m to 22 m along the ordinate. Adoptive constant discharge is 3 L (.) s(-1). Suspended sediment discharge is 4.5 g (.) min(-1) in the primary 3 h and 1.2 g (.) s(-1) thereafter. The total time span of flume experiment is 50 h. In the initial stage of simulation sedimentation mainly occurred in the upper reach, random erosion occurred in the middle reach and the back-ward erosion mainly occurred in the lower reach of the objective area. A rudimental anastomosing river with multiple channels connected each other basically appears about 13.5 h. Hereafter, up to 25.5 h the evolution fashion of the anastomosing river changed from downcutting erosion to faint lateral erosion and the fall back of channel banks is not evident, it indicates that the anastomosing channels changes into its autumn. From 25.5 h to 50 h the abandonment or avulsion of an individual channel are the new evolution characteristics of the simulated anastomosing river. The whole flume experiment simulates successfully the formation and evolution of natural anastomosing rivers and proves that the anastomosing river is a new river pattern, which is different from anabranched river. This is a useful attempt to reveal the formation of anastomosing rivers via flume simulation and helpful to understand the characteristics of anastomosing rivers. |
| 收录类别 | CPCI |
| 会议录出版者 | Tsinghua University Press |
| 语种 | 英语 |
| ISBN号 | 7-302-09684-8 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/25312]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang S. J.. Simulation experiment of anastomosing multiple channel formation[C]. 见:. |
入库方式： OAI收割
来源：地理科学与资源研究所
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