Field experimental study on bed load particle movement in a mountain stream
文献类型：EI期刊论文
| 作者 | Huang He-Qing; Yu Guo-An |
| 发表日期 | 2012 |
| 关键词 | Sediment transport Landforms Open channel flow |
| 英文摘要 | Bed load transport in mountain streams is very difficult to be determined since it strongly correlates to streambed structure (roughness structure). Based on a specially designed underwater observation and video-capturing system, experiments on bed load movement under three streambed structure development scenarios, i.e., well developed, partially developed, and no streambed structures (plane bed), was conducted in a mountain stream in southwest China. Dynamic features of bed load transport (starting mode, trajectory, velocity, and acceleration velocity) under these three typical streambed conditions were observed and analyzed. The streambed structure development degree was measured by a specially manufactured instrument to analyze correlation between bed load transport and streambed structure development. Bed load movement strongly depends on streambed conditions of mountain streams. For channels with well-developed streambed structures, bed load mainly move in intermittent saltation, and almost no other motion form occur, bed load transport rate is often very low under this condition. For channels with partially-developed streambed structure, saltation motion is still the main motion form, and contact motion also occurs. When no streambed structure develops (plane bed), both saltation and contact motion occur, contact motion gradually become the main motion form, and if flow intensity and incoming sediment reach the critical high values, laminated load motion occur and will be the main part of bed load transport. In essence, bed load transport and streambed structures both form flow resistance (dissipate flow energy) and are inter-restricted. For a specific stream power, the bed load transport rate is inversely proportional to the development degree of streambed structures in a logarithmic coordinate system for the same stream reach. |
| 出处 | Shuili Xuebao/Journal of Hydraulic Engineering
 |
| 卷 | 43期:6页:631-638 |
| 收录类别 | EI |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/27713]  |
| 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 | Huang He-Qing,Yu Guo-An. Field experimental study on bed load particle movement in a mountain stream. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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