Arumugam, Mohd Aminur Rashid Bin Mohd Amiruddin
(2012)
Modeling Of Infiltration Characteristics Through Hexagonal Modular Permeable Pavements Design Using Flow-3d.
PhD thesis, Universiti Sains Malaysia.
Abstract
Modular permeable pavements have been regarded as an effective tool in
helping with stormwater control. Permeable pavements are now considered an
effective BMP for reducing stormwater runoff volume and peak flow. To further test
the hydrologic and hydraulic responses of various permeable pavement designs, an
infiltration rig consisting of newly invention Hexagonal Modular Permeable
Pavement System, (HMPS) was constructed. Each pavement section covered an area
of 0.313 m2 and 0.6m depth. The HMPS sections consisted of hexagonal modular
with gravel fill and were underlain by gravel base layer. Exfiltrate from the
permeable pavements drained via underdrains in the gravel base layer. Hydrologic
differences among pavements were evaluated for surface runoff volume and total
outflow volume. The effects of rainfall depth and rainfall intensity were evaluated for
all hydrologic responses. HMPS significantly reduced surface runoff volumes and
peak flow rates from those of asphalt. This study further focused on modelling and
visualizing the changes in the permeable pavements using FLOW-3D in cooperating
with laboratory experiment. The software was calibrated with the data from both
laboratory and on site experiment. Velocity magnitude fields and pressure fields
were observed against to infiltration characteristics in different HMPS layer
thickness. Results from FLOW-3D showed that height of water were agreeable to
laboratory observed data. Based upon this study, HMPS with porosity of 35% was
recommended. Each unit of HMPS would consist of 10cm thick of hexagonal
module; thus six vertical units would be required to make up the total thickness of
the system, which would cater for 0.3cm/hour rainfall intensity.
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