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为了研究来沙条件对河床结构及推移质输沙率的影响过程,认识山区河流的推移质运动规律,选择在云南蒋家沟泥石流堆积体上进行野外试验。试验选择在非汛期进行,在试验河道采用人工加沙模拟上游来沙,对不同加沙率时的推移质输沙率及河床结构强度的变化过程进行连续监测。试验结果表明:上游来沙(或推移质运动)会使河床结构强度Sp降低,对河床结构造成危害,导致推移质输沙率的迅速增加;而推移质连续来沙必须先改变河道的河床结构强度才能增加推移质输沙率。在水流能量和河床结构强度相同的条件下,不同河流的推移质输沙运动相似。
In order to study the influence of incoming and outgoing sediment conditions on river bed structure and bedrock transport rate, and to understand the law of bedrock mass movement in mountainous areas, we conducted a field experiment on the debris flow in Jiangjiagou, Yunnan Province. The experiment was carried out in non-flood season. In the experimental channel, the artificial Gaza was used to simulate the incoming and outgoing sediment. The sediment transport rate at different Gansu rates and the change of riverbed structural strength were continuously monitored. The results show that the upstream sediment transport (or thrusting movement) will decrease the structural strength Sp of the riverbed and cause the damage to the riverbed structure, resulting in the rapid increase of the bedrock transport rate; and the sediment transporter must change the riverbed structure Intensification can increase the rate of sediment transport. Sediment transport movements of different rivers are similar under the same water flow and riverbed structural strength.