Abstract
The flow resistance of the existing modules in the bio-ecological drainage system (BIOECODS) is high and may lead to flood instead of its mitigation. As part of efforts to enhance the performance of the system, the river engineering and urban drainage research center (REDAC) module was developed. This study modelled the hydrodynamics of flow through this module using FLOW-3D and laboratory experiments for two cases of free flow without module (FFWM) and flow with a module (FWM) to understand and visualize the effects of the module. With less than 5% error between the numerical and experimental results, REDAC module altered the flow pattern and created resistance by increasing the Manning’s roughness coefficient at the upstream, depth-averaged flow velocity (43.50 cm/s to about 46.50 cm/s) at the downstream and decreasing water depth (7.75–6.50 cm). These variations can be attributed to the complex nature of the module pattern with further increase across the porous openings. Therefore, the technique used herein can be applied to characterize the behavior of fluids in larger arrangments of modules and under different flow conditions without the need for expensive laboratory experiments.
Highlights
Urbanization sometimes comes with lots of changes in natural hydrology as a result of more impervious surfaces such as pavements and rooftops [1,2]
Pattern designed based on the fact that the flow resistance of the existing module in the BIOECODS is high resulting in low-flow velocity and high attenuation which if not properly handled may lead to flooding instead of mitigating it
The full scale of the experiments were carried out at the hydraulic laboratory of REDAC, Universiti Sains Malaysia (USM) and the single module experiments were conducted at the hydraulic laboratory of Universiti Teknologi Petronas (UTP)
Summary
Urbanization sometimes comes with lots of changes in natural hydrology as a result of more impervious surfaces such as pavements and rooftops [1,2]. Water pollution, scouring of channels and sedimentation had been highlighted by Ainan et al [3] and Barber et al [4] as the potential consequences of this phase of development This necessitates the development of new sustainable stormwater management and control strategies that utilize the concept of “control at source” as highlighted by Fletcher et al [5] and can promote infiltration, reuse, quality, and quantity enhancement [3,6]. As part of efforts to enhance the performance of this technology, the REDAC module was developed Hydraulic performance in terms of flow resistance as well as the flow pattern of this type of module is still not fully understood
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