Occurrence of bed load transport in the presence of stable clast |
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| Authors: | Mohd Sofiyan Sulaiman Shanker Kumar Sinnakaudan Set Foong Ng Kyle Strom |
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| Institution: | 1. I-Geo Disaster Research Center, Faculty of Engineering& Technology Infrastructure (FETI), Infrastructure University Kuala Lumpur (IUKL), 43000 Kajang, Selangor, Malaysia;2. Water Resources Engineering& Management Research Center (WAREM), Universiti Teknologi MARA, 13500 Permatang Pauh, Pulau Pinang, Malaysia;3. Faculty of Computer& Mathematical Sciences, Universiti Teknologi MARA, 13500 Permatang Pauh, Pulau Pinang, Malaysia;4. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, United States |
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| Abstract: | It is well-versed that transport occurrence is vital for in stream rehabilitation, river restoration and installment of sediment sampler on river beds. Current practice emulates the use of continuous pre-diction using reach-averaged approach. However, prediction of transport occurrence entails the use of binary model through the execution of logistic regression analysis. Bed load and turbulence data were physically measured at mountainous region with divergent surface bedform in its presence. The para-meterization and statistical approaches are treated in the similar fashion with multiple regression except for the test for model fit and model selection criterion. The parameters on near-bed turbulence char-acteristics at the entrainment threshold were assigned as independent variables containing 15 pre-dictors. Almost 80 models were generated by selecting the best possible combination in accordance with the statistical precaution of alleviating multicollinearity issue. It is postulated that the model containing shields stress in the form of turbulent kinetic energy (TKE) at vertical direction and fractional time for second quadrant provides better estimation of potential location for greatest sediment-entrainment;hence a high possibility for transport occurrence. |
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| Keywords: | Logistic regression analysis Transport occurrence Bed load Entrainment Local bed shear |
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