Performance of a Geobag Revetment. II: Numerical Modeling

Akter, Aysha, Crapper, Martin, Pender, Gareth, Wright, Grant and Wong, WaiSam (2013) Performance of a Geobag Revetment. II: Numerical Modeling. Journal of Hydraulic Engineering, 139 (8). pp. 877-885. ISSN 0733-9429

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Official URL: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.00007...

Abstract

An intensive study including laboratory experiments and use of a computer software on geobag revetment performance was reported in the companion paper. To represent the failure initiation, a set of quasi-physical model runs was carried out and the conveyance estimation system (CES) computer software was employed to predict active shear stress on geobags and mobile sand bed formation. The CES could predict the depth-averaged velocities in the laboratory measurements with reasonable accuracy. This paper reports the second part of the study, dealing with the discrete element modeling (DEM) simulation. The CES results were used for preparing a mapped velocity field for a coupled DEM simulation of geobag revetment failure. The validated DEM model could identify well the critical bag location in varying water depths and with varying bed formations. Toe scour, one of the major instability factors in revetments, and its influence on bottommost layer of the bags were also reasonably represented in this DEM model. It is envisaged that the use of a DEM model will provide more details on geobag revetment performance in riverbanks.

Item Type: Article
Uncontrolled Keywords: Geobag, Revetment, Failure, CES, DEM
Subjects: F900 Others in Physical Sciences
H200 Civil Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Becky Skoyles
Date Deposited: 03 Jun 2016 15:21
Last Modified: 03 Jun 2016 15:21
URI: http://nrl.northumbria.ac.uk/id/eprint/27003

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