Challenges in Physical Modeling of Erosion

• Main Authors: Saiedi, Saied, Mustaffa, Zahiraniza, Teh, Hee Min, Abu Bakar, Nabilah
• Format: Article
• Published: 2009
• Subjects: TC Hydraulic engineering. Ocean engineering; TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.utp.edu.my/8374/1/SaiedZahiraniza_ChallengesPhysical.pdf; http://eprints.utp.edu.my/8374/

The methods used in the design of a physical model of a bed erosion in a large pond downstream of a tailrace outfall structure are discussed. The model was a laboratory simulation of a free surface flow from a hydropower tunnel into a large pond with the aim of reducing discharge into a downstream river. A significant part of the investigation was the laboratory reproduction of a damaging erosion process below a large concrete apron. Four challenges in the design and operation of the physical model were dealt with: (1) providing for sufficient erosion depth below the rigid bed floor, (2) choosing a proper scaling ratio for sediment grain size, (3) continuously accessing the study area without disturbing the flow or the bed topography, and (4) making quick measurements of the bed topography at the end of each test. The methods employed and the lessons learned could enhance the laboratory skills of physical modelers of movable bed projects.