Experimental Study on Suspended Load Delivery Characteristics When Debris Flow Confluence with Main River
For quantitative analysis of the suspended load delivery characteristics when debris flow confluence with main river, a miniature flume simulation system had signed. The test material is screen out grain size under 20 mm of debris flow deposits in Jiangjia Gully. Based on the field observation of debris flows in the Jiangjia Gully, when debris flows inpour to a main river, the influencing factors of suspended load delivery are the debris flow bulk density, confluence angle, and the contrast relation between the discharge of the debris flow and the main river. Thus experiments were conducted for the systematic study of different debris flow bulk densities), confluence angles, and branch flume slopes (14° and 17°). During the experimentation, water samples were collected in the down reach of confluence area. Also, the sediment concentration and grain composition were measured for the analysis. According to the experimental study, some conclusions can be drawn: (1) If the bulk density is large, the debris flow inpours to the main flume integrately, only the fine sediments on the surface are washed and deliveryed by the main flume flow. On the contrary, if the bulk density is small, debris flow will strongly mix with the main flume flow; more sediments can be deliveryed, and the rate of the suspended load delivery is larger. (2) The larger of the confluence angles, the stronger of the debris flows mixing with the main flume flow, and then the more suspended load delivery to the downstream. (3) The discharge ratio can be expressed as the relationship between the debris flow and the main flume flow well. The experiment results show that the large discharge ratio takes account for the large suspended load delivery ratio.
Debris flow Confluence with main river Suspended SDR Experimental study
ZHANG Jinshan SHEN Xingju LIN Wei
Key Laboratory of Mountain Hazard and Surface Processes, Chinese Academy of Sciences, Sichuan Chengd College of Tourism and History & Culture, Southwest University for Nationalities, Sichuan Chengdu 61
国际会议
西安
英文
1083-1087
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）