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DSD-INT 2023 Dam break simulation in Derna (Libya) using HydroMT_SFINCS - Prida

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Presentation by Álvaro Prida (AXA Climate, France) at the Delft3D User Days, during the Delft Software Days - Edition 2023 (DSD-INT 2023). Wednesday, 15 November 2023, Delft.

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DAM BREAK SIMULATION IN DERNA
(LIBYA) USING HYDROMT_SFINCS
Souhail Aboulfadile,
Alvaro Prida
AXA CLimate
Background
There were two major dams upstream from Derna
• The first dam, which had not been maintained since 2002,
was 70 metres tall.
• The second is 45 meters tall.
• Both are not very large.
The initial break
When the first dam collapsed, the second dam had to deal
with:
• The heavy rains
• Raging wall of water released with force from behind the
other dam.
Momentum:
The elevation difference strenghtened the force of the water.
The stream took the second dam down on its way to Derna
and ultimately, the sea.
Upstream dam
Downstream dam
Derna:
Population:
100000
Storm Daniel brought heavy rain
WHAT HAPPENED IN DERNA
CITY ?
ASSUMPTIONS AND MODELLING DECISIONS
Assumptions:
• Upstream dam broke by overtopping
• Downstream dam could not resist to the height
and momentum of the propagated wave + the
pouring rain.
• Bathymetry ?
Simulation scenarios:
• Scenario 1: Filling up the dam basin using
a weir structure.
• Scenario 2: Restart simulation 1 without
the weir.
70m
SCENARIO 1: FILLING UP THE
DAM BASIN
Static data:
• DEM: FABDEM+ (30m
resolution)
• Manning values (0.03
river+VITO dataset)
• Constant discharge at
river inflow point.
• Weir structure (70-75m)
Dynamic data:
• Rainfall: 75 mm on 09-
11. (NASA GPM Satellite
for Derna City)
• Infiltration based on wet
antecedent conditions
(GCN dataset)
Output
Sfincs.rst
• Same Static input
data.
• Initial conditions =
Last simulation output
(zs, qx, qy, umean,
vmean)
• No forcing data.
• Removal of the
upstream weir
structure.
• Downstream weir not
considered.
Input
Sfincs.rst
Model run on subgrid mode
(60m)
SCENARIO II: RELEASING THE
RETAINED WATER
1001
1002
1003
1004
1005
RESULTS: WAVE PROPAGATION

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DSD-INT 2023 Dam break simulation in Derna (Libya) using HydroMT_SFINCS - Prida

  • 1. DAM BREAK SIMULATION IN DERNA (LIBYA) USING HYDROMT_SFINCS Souhail Aboulfadile, Alvaro Prida AXA CLimate
  • 2. Background There were two major dams upstream from Derna • The first dam, which had not been maintained since 2002, was 70 metres tall. • The second is 45 meters tall. • Both are not very large. The initial break When the first dam collapsed, the second dam had to deal with: • The heavy rains • Raging wall of water released with force from behind the other dam. Momentum: The elevation difference strenghtened the force of the water. The stream took the second dam down on its way to Derna and ultimately, the sea. Upstream dam Downstream dam Derna: Population: 100000 Storm Daniel brought heavy rain WHAT HAPPENED IN DERNA CITY ?
  • 3. ASSUMPTIONS AND MODELLING DECISIONS Assumptions: • Upstream dam broke by overtopping • Downstream dam could not resist to the height and momentum of the propagated wave + the pouring rain. • Bathymetry ? Simulation scenarios: • Scenario 1: Filling up the dam basin using a weir structure. • Scenario 2: Restart simulation 1 without the weir. 70m
  • 4. SCENARIO 1: FILLING UP THE DAM BASIN Static data: • DEM: FABDEM+ (30m resolution) • Manning values (0.03 river+VITO dataset) • Constant discharge at river inflow point. • Weir structure (70-75m) Dynamic data: • Rainfall: 75 mm on 09- 11. (NASA GPM Satellite for Derna City) • Infiltration based on wet antecedent conditions (GCN dataset) Output Sfincs.rst
  • 5. • Same Static input data. • Initial conditions = Last simulation output (zs, qx, qy, umean, vmean) • No forcing data. • Removal of the upstream weir structure. • Downstream weir not considered. Input Sfincs.rst Model run on subgrid mode (60m) SCENARIO II: RELEASING THE RETAINED WATER
  • 8. KEY TAKEOUTS Bathymetry Calibrations Wave arrival time Instabilities
  • 9. DAM BREAK SIMULATION IN DERNA (LIBYA) USING HYDROMT_SFINCS Souhail Aboulfadile, Alvaro Prida AXA CLimate QUESTIONS ?