Flow Pattern And Hydraulic Characteristics A Of Hexagonal Modular As Channel Bed
Loading...
Date
2019-05-01
Authors
Abu Seman @ Hj Ahmad, Nor Amirah
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Studies have shown that sustainable designs such as Sustainable Drainage Systems
(SUDS) would help mitigate some of these effects sustainable. SUDS is natural drainage
systems that simulate the natural drainage of a catchment and work in harmony to achieve
an increase in ground infiltration and treatment of runoff; and a reduction in flow rates
and volume of surface runoff, improving biodiversity and ultimately improving
sustainability. However, the sustainability of SUDS devices is questionable because their
component parts involve the use of natural resources. This study proposed the application
newly designed namely Green Drainage System (GDS) using HM as channel bed.
Therefore, it is important to determine the hydraulic characteristic of this module focusing
on HM. This thesis investigated experimentally using tilting flume channel and rig
simulator. HM as a bed channel was tested at three different slopes of 0.002, 0.005 and
0.008 and each slope consists of four different discharges. In order to verify the results of
experimental measurements of the flume channel, the numerical modeling for all the cases
was considered, under the same operating conditions with experimental measurements
using porous media models and turbulence model (FLOW3D). Results agreed that the
experimental and numerical results show good agreement. The maximum flow velocity
occurs near the water surface with an increasing flow velocity at increasing depth. The
steeper the slopes shows higher maximum water velocity near the water surface
emphasized toward the end of flume channel. HM as the effect of porous bed on the
turbulent characteristics of the flow in an open channel is different in comparison with the
impermeable bed. The velocities are reduced with the decreasing of the water level due
to the greater influence of the HM on the flow above the porous bed. It is apparent that
the order of reduction velocity porous bed with HM >porous bed without HM > impermeable bed.