Experiments investigation on longitudinal breaching of natural dam

被引：0
|
作者：
Jiang X. [1 ,2 ]
Cui P. [1 ]
Wang Z. [3 ]
Heng W. [4 ]
机构：
[1] Key Lab. of Mountain Hazards and Earth Surface Progress, Inst. of Mountain Hazards and Environment, CAS, Chengdu
[2] College of Civil Eng., Sichuan Agricultural Univ., Chengdu
[3] State Key Lab. of Hydroscience and Eng., Tsinghua Univ., Beijing
[4] China Construction Steel Structure Co., Shenzhen
来源：
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | 2016年 / 48卷 / 04期
关键词：
Breach; Discharge; Headward erosion; Longitudinal erosion;
D O I：
10.15961/j.jsuese.2016.04.006
中图分类号：
学科分类号：
摘要：
In order to obtain the progress of longitudinal erosion and effects of different factors, 6 flume tests were conducted. The results indicated that the longitudinal erosion process included 3 stages. At stage I, the outflow was slow, and the suspended load was transports to downstream mainly during the process. At stage II, the depth of the breach changed rapidly. The bed load was transports fiercely due to backward erosion. At stage III, the velocity and rateof outflow decreases, armor layer is formed which protects the sediment under the armor layer from eroding. At last, dynamic equilibrium was achieved between the water phase and sediment phase. With inflow rate increasing, the breach time decreases and outflow discharge increased, leading to greaterstream power and highererosion rate. And the bottom of the breach become smoothly due to large inflow rate. The slope of the erosive characteristics curve become larger with the outflow discharge increasing. The shape of erosive curve changed from multi-peak curve to mono-peak curve with downstream slope increasing. The steepslope of downstream also increased the outflow discharge and erosion rate, and decreased the residual height of the dam. The factor J3 which was equal to the third power of tangent values of the bed slope and downstream slope's summation, could reflect the stability of soil particles in different downstream slopes. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved.
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页码：38 / 44
页数：6
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