论文部分内容阅读
Glaciers are extensively developed in the southwest of Tibet and the moraines are widely distributed with large depth. Large-scale debris flows are often reported which blocked rivers and formed dams. In this paper,seven large debris flows in four valleys are discussed,among which five dams developed. 13 sets of ex-periments have been conducted in laboratory to simulate the forma-tion and failure of the dam. Finally,a model of dam failure is pro-posed and a formula is established to calculate the flood discharge:Q k bh hk BG0.41= T L,where bk is the outlet width of the dam at the original water level,hk the erosive depth,T the time from overflow to final state of failure,the average width of lake;L the length of the lake,and G the total potential energy of the water in the lake.
Glaciers are extensively developed in the southwest of Tibet and the moraines are often distributed with large depth. Large-scale debris flows are often reported which blocked dams and formed dams. In this paper, seven large debris flows in four valleys are discussed, among which five sets of ex-periments have been conducted in laboratory to simulate the formations and failure of the dam. Finally, a model of dam failure is pro-posed and a formula is established to calculate the flood discharge: Q k bh hk BG0.41 = TL, where bk is the outlet width of the dam at the original water level, hk the erosive depth, T the time from overflow to final state of failure, the average width of lake; L the length of the lake, and G the total potential energy of the water in the lake.