| CONCENTRATION AND VELOCITY OF DEBRIS FLOWS |
| |
| 作者姓名： | Xiangjun FEI Peng CUI Yong LI |
| |
| 作者单位： | Tsinghua University，Beijing，100084，China，Institute of Mountain Hazards and Environment，Chinese Academy of Sciences & Ministry of Water Conservancy，Chengdu，610041，China，Institute of Mountain Hazards and Environment，Chinese Academy of Sciences & Mini |
| |
| 基金项目： | This research is supported by the National Science Foundation,NSF grant No.49831010. |
| |
| 摘 要： | 1 RESISTANCE TO WATER-STONE FLOW As a special sort of debris flow, water-stone flow, or as generally called, sub-viscous debris flow, always occurs in channel of steep slope, dominantly in composition of coarse grains of bedload and laminated load with less suspended load. In some literature, water-stone flow is defined for convenience of study as that without suspended fine grains in composition, and it follows from this definition that transportation concentration of this kind of …
|
CONCENTRATION AND VELOCITY OF DEBRIS FLOWS |
| |
| Xiangjun FEI,Peng CUI,Yong LI.CONCENTRATION AND VELOCITY OF DEBRIS FLOWS[J].International Journal of Sediment Research,2002,17(3). |
| |
| Authors: | Xiangjun FEI Peng CUI Yong LI |
| |
| Abstract: | Debris flows in nature generally fall into three groups distinct in their grain composition: water-stone flow, or sub-viscous debris flow, dominated by coarse grains; muddy flow, dominated by fine grains; and viscous debris flow composed of grains in large range. Liquid-phase velocity and sedimentary delivery resistance of sub-viscous debris flow have been discussed based on the composition characters of sub- and high-viscous debris flows. It is revealed that the presence of fine grains plays a vital role in affecting resistance and average velocity, particularly when the volume fraction of grains in the flow is relatively high, i.e. Sv > 0.45. Grain-size distribution of viscous debris flow is characterized by a bimodal curve, which explains the properties like high density and low resistance gradient of debris flows. A calculation formula is finally put forward, which has to some extent overcome locality limits and achieved a good agreement with the field observations of debris flows in Southwest China. |
| |
| Keywords: | Sub-viscous debris flow Viscous debris flow Grain composition Concentration Velocity |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
