|
ABSTRACT
Numerous flood mitigation projects
are being implemented throughout
the country especially in urban areas. The occurrence of
floods after the project completions shows the project
completions shows the existence of damages
to the rigid bank walls and serious problems of erosion and
deposition.
Referring
to the above problem, two completed flood mitigation
projects, namely, Pari River Flood Mitigation
Project Phase 2, Ipoh and Kerayong
River Flood Mitigation Project Phase 4, Kuala Lumpur
were chosen as case studies. The aims of the study are to
evaluate the capacity of newly improved channels for both projects in
accommodating the designed flood discharge and the stability
of the bank protection structures taking into
account effects of erosion and
deposition using two mathematical models,
namely, FLUVAL –12 (“Mathematical Model for Erodible
Channel”) dan HEC – 6 (“Scour and Deposition in
Rivers and Reservoir”). This research also emphasis
sediment transport in alluvial river since it can be considered as a
new subject in this country.
Result
of this study on sediment transport in several rivers in Kinta
District show that the existence of relationships between
bed load and discharge, total bed material load and
discharge, and between bed load and
bed material. Graf’s (1968) and Yang’s (1972)
sediment transport equations are found to be suitable for
predict the sediment transport inall the rivers studied. Calibration
results for Pari River show that FLUVAL – 12 using
Graf’s give the closest resemblance to measured
flood levels, flow rating curve at
Manjoi Bridge and the location of
damaged rigid bank walls. Calibration results using HEC
– 6 shows that this model can be used for
estimating the cannel capacity but not suitable for
analyzing the stability of the bank protection structures at Pari
River.
Simulation
result of Kerayong River shows that
Yang’s sediment transport produces a better result compared
to Graf’s equation (which is more suitable
for Pari River). This indicates hat different rivers
may behave differently. Hence the problems pertaining to each
river should be treated individually.
|