|
ABSTRACT
Development,
which takes place in river catchment areas, will result in discharge
and bed erosion increment or scouring and deposition. The matter
stated above will result in the unstability in the river channel. When
this happens, there will be failures to the riverbank or in the river
protection structure and reduce the channel capacity to flow the flood
to downstream. Therefore, it is necessary to predict the river channel
stability that will happen due to the existing development or the one
which will take place in the future in a river catchment area.
This
study covers three rivers, which are Pari River in Ipoh, Perak,
Kerayong River in Kuala Lumpur and Kulim River in Kedah. This study
involves the collection of hydrological data such as rainfall data,
river stage data, the discharge and also data related to erosion and
deposition like the river bed sediment load, suspended load and river
bed material. Observation was also conducted to identify the changes
of the riverbed in a few locations of these rivers. The data collected
were analyzed to assess the sediment transport equation in order to
predict the sediment rate that is very close with the observed
sediment rate.
The
new equation for sediment transportation for the rivers in Malaysia is
also formed based on the observed data. It was found that the Yang
equation is the best followed by the Graf equation. Base on the
equations that are stated above sediment transport rating curve can be
developed in any locations of a river. The information of the sediment
transport rating curve together with the sediment information
connected to the design of hydrograph information generated from RORB
model can be used in sediment transport models such as HEC-6 and
Fluvial-12 to predict the river channel stability due to the existing
development or in the future in a river catchment area. Hence,
engineers can take some possible early actions to protect the
riverbanks or the river protection structures from any failures. The
maintenance works of the river could be run efficiently with the
minimum cost.
|