设计水槽实验分析不同流态下的河流扇沉积体.

The fluvial fan has received a lot of attention from academics recently, which is a contentious topic in sedimentology. In order to study the sedimentary characteristics of fluvial fans under different climatic, flume experiments were designed by using the control variable method. According to the natural climatic conditions, flume experiments were used to simulate the fluvial fan under fixed and variable velocity conditions. According to the experimental results, the sedimentary characteristics of the fluvial fan were analyzed and the corresponding model was established. The results show that there are three different development stages of typical fluvial fan. In the early stage, overflow quickly forms a fluvial fan with no lobe and complete fan shape. In the middle stage,river mouth bars appear and disappear periodically, resulting in the alternate development of the middle and both sides of the fan, and the growth rate slows down. In the late stage, due to the size of the accommodation space, the fluvial fan stops developing, the river channel tends to be stable and develops lobules along the end. The development of fluvial fan is mainly affected by the early overflowing sedimentation, middle and late channel swing and lobular sedimentation. The channel swing sedimentation and lobular sedimentation of fluvial fan are quite different under different flow velocities. It is concluded that the development of fluvial fan is the result of the interaction of three factors: flow velocity, channel shape and sedimentary body. [ABSTRACT FROM AUTHOR]