Laboratory Experiments on Breaching Characteristics of Natural Dams on Sloping Beds

Resumo

Natural dams formed by landslides may produce disastrous floods after dam outburst. However, studies on the breaching characteristics of natural dams on sloping beds systematically are still at an early stage, and especially the relationship between breach width and depth is still unclear. In this paper, results of a series of laboratory tests that assessed seven different flume bed slope angles are presented. The results show that 3 stages of breaching process of natural dams on different bed slopes were observed. According to the results, headward erosion was the main force for enlargement of breach when bed slope was relatively small. With the increasing of bed slope, the effect of tractive erosion on longitudinal development of breach wass enhanced. The discharge hydrographs were unimodal for all the bed slopes. The peak discharge increased first and then decreased with the increasing of bed slope. The elapsed time from the start of breach formation to the moment of peak discharge decreased with the increasing of bed slope. The difference between different bed slopes was larger when the bed slope was small or large, and the relationship between duration and bed slope had the same characteristics. With the increasing of bed slope, the ratio of breach width to breach depth rose to 1 and then decreased with the increasing of bed slope angle. A result of the present work is a function of the relationship between the breach width and depth for which it is possible to calculate

Tipo

Artigo

Área

Engenharia

Ano

2019

Idioma

Inglês

Licença

CC BY

DOI

10.1155/2019/5064093

Como citar (ABNT)

JIANG, Xiangang. Laboratory Experiments on Breaching Characteristics of Natural Dams on Sloping Beds. Advances in Civil Engineering, v. 2019, n. 1, 2019. DOI: 10.1155/2019/5064093.