Gully performance – connecting above and below ground system EPSRC Grant: EP/FP202511/1 Ida Sabtu Gavin Sailor John Blanksby Adrian Saul Istvan Galambos Gavin Tabor Albert Chen Slobodan Djordjević
Gully performance – connecting above and below ground system EPSRC Grant: EP/FP202511/1 Ida Sabtu Gavin Sailor John Blanksby Adrian Saul Istvan Galambos.
Jan 11, 2016
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Gully performance – connecting above and below ground system
EPSRC Grant: EP/FP202511/1
Ida SabtuGavin Sailor
John BlanksbyAdrian Saul
Istvan GalambosGavin TaborAlbert Chen
Slobodan Djordjević
Interaction of flows above & below ground inflow
Q=?Q=?
overflow (geysering)
Research objectives • Improved understanding of interactions• Reliable head/discharge relationships• Enhancement of urban flood models• Better flood risk management
Methodology • Experimental investigation• Numerical simulation (CFD)• Identification of parameters
urban surface + inlet grating + gully structure underneath
(+ surcharged pipe + header tank)
Full-scale experimental setup
Experiments
flow into the gully overflow from the gully
Experimental conditions • Flow directions:
– into the gully– overflow from the gully– transition
• Range of flow rates• Varying surface slope
Measurements • Flow rates (inflow, outflow)• Surface water levels (54 points)• Pressure in the gully and at 6 surface points
OpenFOAM model computational grid
fine 3D mesh nested 2D/3D model
Effect of cross slope on flow patterns=1:20 s=1:60 s=1:200
D istribution of flow into gullyC ross slope 1 :20
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
Pe
rcen
tag
e o
f flow
[%]
S ection1 S ection2 S ection3
D istribution of flow into gullyC ross slope 1 :60
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
Pe
rcen
tag
e o
f flow
[%]
S ection1 S ection2 S ection3
D istribution of flow into gullyC ross slope 1 :200
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
Pe
rcenta
ge of flow
[%]
S ection1 S ection2 S ection3
Comparison of simulated and observed depths
Median 25%-75% Non-Outlier Range Outliers ExtremesF60-D1
F60-D2F60-D3
F60-D4F60-D5
F60-D6
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Dep
th [
cm]
SimulatedMeasured:
6 measurement points
Gully overflow/surface flow interaction
Links to related projects
• University of Coimbra (experimental & CFD modelling)• EU SKINT project (field testing of gullies in Bradford)
Concluding remarks• Dual drainage modelling has become a common practice• Interaction of flows above and below ground can now be
modelled more reliably
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