Tai Lam Chung Reservoir Waterfall Dam
Side Channel Spillway Model Study
|
Located in Tuen Mun, New Territories, the Tai Lam Chung Reservoir has
a direct catchment area of 16.5 km2, with a Probable Maximum Flood (PMF) of 703
m3/s. Flood flows are discharged over a concrete gravity dam side channel
spillway with a crest length of 138m. In order to safeguard downstream developments, a
physical and mathematical modelling study of the spillway has been carried out in the
hydraulic laboratory of the civil engineering department, University of Hong Kong, to
determine:
- the head discharge relationship of the
spillway,
- the flow characteristics of the spillway
and capacities of the side channels for various flood conditions.
|
View of spillway from downstream
|
Stilling basin and apron
|
Down stream river course
|
Left stepped side channel
|
Observed Tai Lam Chung spillway for 27.9.93 flood.
|
Observed spillway flow for 27.9.93 flood.
|
Observed flow in left side channel for 27.9.93 flood
|
Observed flow in right side channel for 27.9.93 flood
|
Spillway flow over central weir sections at PMF |
Oblique view of cross-currents and jet splashing in side
channels at PMF
|
Observed flow in left channel at PMF |
Observed flow in right channel at PMF
|
Side view of air-water flow over the steps of the right side
channel |