水利学报2012，Vol.43Issue(6)：631-638,8.
山区河流推移质运动的野外试验研究
Field experimental study on bed load particle movement in a mountain stream
摘要
Abstract
Bed load transport in mountain streams is very difficult to be determined since it strongly corre- lates 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 develop- ment 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 instru- ment to analyze correlation between bed load transport and streambed structure development. Bed load move- ment 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 oc- cur, 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 grad- ually become the main motion form, and if flow intensity and incoming sediment reach the critical high val- ues, 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.关键词
山区河流/推移质运动/视频采集系统/河床结构/发育程度Key words
mountain stream/bed load movement/video capture system/streambed structure/develop-ment degree分类
建筑与水利引用本文复制引用
余国安,王兆印,张康,黄河清..山区河流推移质运动的野外试验研究[J].水利学报,2012,43(6):631-638,8.基金项目
国家自然科学基金（41001008 （）
40788001） （）
中国水利水电科学研究院开放基金 （）
