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SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT

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Presentation on theme: "SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT"— Presentation transcript:

1 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 0: 18/11/99 19:30 tc, 2,23 1,25 t = mean boundary shear stress tb = near-bank shear stress LE = Lateral Erosion = groundwater level = river stage tc = critical shear stress -30 60 30 -10 -20 10 20 40 50 uw (kPa)

2 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 1: 18/11/99 21:00 1,25 2,23 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

3 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 2: 18/11/99 22:00 1,25 2,24 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

4 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 3: 18/11/99 22:30 1,25 2,24 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

5 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 4: 19/11/99 2:00 1,25 2,14 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

6 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 5: 19/11/99 3:00 1,25 2,09 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

7 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 6: 19/11/99 3:30 1,25 2,05 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

8 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 7: 19/11/99 4:00 1,11 2,02 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

9 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 8: 19/11/99 4:30 1,26 1,44 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

10 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 9: 19/11/99 5:00 1,89 1,21 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

11 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 10: 19/11/99 5:30 2,58 1,07 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

12 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 11: 19/11/99 6:00 3,10 0,96 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

13 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 11: 19/11/99 6:00 3,10 0,96 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

14 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 11: 19/11/99 6:00 3,62 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

15 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 12: 19/11/99 7:30 4,09 0,82 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

16 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 12: 19/11/99 7:30 4,09 0,82 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

17 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 12: 19/11/99 7:30 4,13 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

18 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 13: 19/11/99 9:00 3,15 0,69 1,07 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

19 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 13: 19/11/99 9:00 3,15 0,69 1,07 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

20 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 13: 19/11/99 9:00 3,19 1,07 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

21 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 14: 19/11/99 10:30 1,95 0,53 0,97 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

22 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 14: 19/11/99 10:30 1,95 0,53 0,97 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

23 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 14: 19/11/99 10:30 2,01 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

24 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 15: 19/11/99 11:00 1,44 1,55 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

25 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 16: 19/11/99 11:30 1,04 2,73 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

26 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 17: 19/11/99 12:00 0,63 1,41 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

27 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 17: 19/11/99 12:00 0,63 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

28 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 17: 19/11/99 12:00 1,40 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

29 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 18: 19/11/99 12:30 1,18 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

30 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 19: 19/11/99 13:00 1,13 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

31 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 20: 19/11/99 14:00 1,15 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

32 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 21: 19/11/99 16:00 1,21 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

33 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 22: 19/11/99 18:00 1,25 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

34 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 23: 20/11/99 0:00 1,32 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

35 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 24: 20/11/99 6:00 1,34 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

36 SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT
Step 25: 20/11/99 12:00 1,35 tc, -30 60 30 -10 -20 10 20 40 50 uw (kPa) = river stage = groundwater level t = mean boundary shear stress tb = near-bank shear stress tc = critical shear stress LE = Lateral Erosion

37 Comparison of bank profiles
SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT Comparison of bank profiles Initial bank profile Computed final profile Measured final profile

38 Contribution of different processes
SIEVE RIVER: SIMULATION OF THE 19/11/1999 FLOW EVENT Contribution of different processes LE (m) Fluvial erosion Cantilever Slide Entire profile Cohesive portion Total Fluvial erosion cantilever slide mass failure (m2) , , , , ,54 (m2) , , , , ,54 % , , , ,3 % , , , ,1

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