Farrell Nereus Aegidius (2022) Modelling and simulation of bioretention system using hydrus-1d. Universiti Malaysia Sabah. (Unpublished)
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Abstract
A Bioretention cell is one of the best management practices for low-impact development tools (LIDs) to reduce stormwater runoff and pollutants through infiltration. However, in tropical climate region such as Southeast Asia, higher clogging effect and overflow was observed at the pilot to field scale bioretention. This is due to high rainfall runoff volume, which significantly affects the pressure head and hydraulic conductivity parameters. In this study, 270mm and 370mm lab-scale bioretention column was constructed using plastic acrylic where the height of the engineered soil media is 150mm and 250mm, respectively. The design of the lab-scale bioretention cell column was constructed based on Urban Stormwater Management Manual (MSMA) specifications. The calculated stormwater runoff flow rate is applied to each column to model the actual scale impervious area for runoff generation. The flow sensor measurement for inflow and outflow of water was applied to understand the water movement beneath the engineered soil media. One dimensional water flow model was used to study the effect of different media depth and rainfall intensity on the value of hydraulic – pressure head parameters. The results showed that at lesser rainfall intensity of 5.3mm/min, small percentage of runoff volume reduction was observed at a low height of media (150mm) with a total of 11% compared to 55% of 250 mm media height. At higher rainfall intensity of 12mm/min, no significant deviation was observed in terms of percentage of runoff volume reduction between both heights due to increased pressure head and lower hydraulic conductivity. Root Mean Square Error (RMSE) of the model show higher efficiency between the simulated and observed values of runoff inflow from water flux analysis results generated by HYDRUS-1D. The coefficient of determination R2 represents the highest prediction for the output of the HYDRUS-1D simulation.
| Item Type: | Academic Exercise |
|---|---|
| Keyword: | Bioretention , Hydrus-1d |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) > TA703-712 Engineering geology. Rock mechanics. Soil mechanics. Underground construction |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 06 Mar 2023 16:27 |
| Last Modified: | 06 Mar 2023 16:27 |
| URI: | https://eprints.ums.edu.my/id/eprint/35165 |
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