Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (3): 569-578    DOI: 10.3785/j.issn.1008-973X.2022.03.016
2D non-cohesive earthen embankment breach model based on linear erosion formula
Meng-fan LIU1(),Gang-feng WU2,*(),Ke-feng ZHANG2,Ping DONG2,3
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, China
3. School of Engineering, University of Liverpool, Liverpool L69 3BX, United Kingdom

Abstract

A two-dimensional non-cohesive earthen embankment breach model was developed based on a linear erosion formula. Instead of using sediment transport rate and solving sediment transport equations, the relationship between the bed erosion rate and the flow shear stress was directly established based on a linear erosion formula, to calculate the embankment breach. Compared to the existing detailed physically based model, the proposed model was simpler and more efficient. Firstly, two different examples were used, and the validity of a bed slope failure algorithm was verified. Then, the proposed model was applied to simulate the overtopping breach experiments of one-dimensional and two-dimensional non-cohesive earthen embankment. Results showed that the calculated values of the model were all in good agreement with the measurements at the crest elevation, the final breach width and the peak discharge. And the breach of non-cohesive earthen embankment was simulated fairly accurately by the model. Finally, a sensitivity analysis of key parameters was performed to investigate the effects of different parameter values on the simulated results.

Received: 12 April 2021      Published: 29 March 2022
 CLC: TV 131.4
Fund:  国家自然科学基金资助项目（51909234）；浙江省自然科学基金资助项目（LQ19E090006）；浙江省教育厅一般科研资助项目（Y201737690）
Corresponding Authors: Gang-feng WU     E-mail: 21912141@zju.edu.cn;zjdxwgf@gmail.com