Presentation Slides ICSE 2018 Presentation November 2018 CITATIONS - - PDF document

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Presentation Slides ICSE 2018 Presentation November 2018 CITATIONS - - PDF document

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See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/329374530 Presentation Slides ICSE 2018 Presentation November 2018 CITATIONS READS 0 89 3 authors: Mario Welzel Arndt

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See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/329374530

Presentation Slides ICSE 2018

Presentation · November 2018

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3 authors: Some of the authors of this publication are also working on these related projects: Enabling Open Ocean Aquaculture - system design View project HyConCast View project Mario Welzel Technische Universität Braunschweig

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Arndt Hildebrandt Leibniz Universität Hannover

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Torsten Schlurmann Leibniz Universität Hannover

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Local Scour Development and Global Sediment Redistribution around a Jacket-Structure in combined Waves and Current

Mario Welzel, T. Schlurmann, A. Hildebrandt

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

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Seite 2

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Outline

1) Experimental Setup 2) Test Conditions 3) Bed topography 3D – Scans 4) Dimensionless areal – erosion /deposition 5) Volume differences for 0D and 1D node distance 6) Conclusion

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  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

1) Experimental Setup Wave basin

Qmax = 5m3/s vmax = 0.5m/s

  • length: 40m, width: 25m, active & passive

wave absorption, JONSWAP spectra interacting with currents

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Seite 4

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

3D Wave-Current Basin

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Seite 5

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

3D Laser scanner

global scour

Miniature Echo-Sounder

local scour 1) Experimental Setup

  • Sediment pit:
  • Length 8m
  • Width 6.6m
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Seite 6

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Table 1. Test conditions (0D distance to seabed) Test Hs Tp Um UC KC Ucw Smax/Dpile1 m s cm/s cm/s -

  • 1

0.15 2.0 13.3 10.1 6.7 0.43 0.45 2 0.15 2.0 13.3 22.5 6.7 0.63 0.89 3 0.15 2.0 13.3 38.8 6.7 0.75 1.70 4 0.16 3.4 17.5 10.1 14.9 0.37 1.03 5 0.16 3.4 17.5 22.5 14.9 0.56 1.39 𝑉 𝑉 𝑉 𝑉 ; 𝐿𝐷 𝑉 · 𝑈

  • 𝐸

2) Test Conditions

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Seite 7

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Table 1. Test conditions (0D distance to seabed) Test Hs Tp Um UC KC Ucw Smax/Dpile1 m s cm/s cm/s -

  • 1

0.15 2.0 13.3 10.1 6.7 0.43 0.45 2 0.15 2.0 13.3 22.5 6.7 0.63 0.89 3 0.15 2.0 13.3 38.8 6.7 0.75 1.70 4 0.16 3.4 17.5 10.1 14.9 0.37 1.03 5 0.16 3.4 17.5 22.5 14.9 0.56 1.39 𝑉 𝑉 𝑉 𝑉 ; 𝐿𝐷 𝑉 · 𝑈

  • 𝐸

2) Test Conditions

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Seite 8

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.1: Scour development of test 01-03 at the different positions around the pile

3) Scour development over time

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Seite 9

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.2: (Near) Equilibrium scour depth 𝑇 for pile 1, with 𝑉 0 indicating waves only and 𝑉 1 indicating current only, compared with scour depths of Sumer & Fredsoe (2001)

4) Equilibrium scour depth

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SLIDE 11

Seite 10

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

𝐆𝐣𝐡. 𝟐: Bed topography of test 03 and 05, in top view, global erosion and deposition Test 05 Test 03

3) Bed topography – 3D Scans

1A = 0.55 / 0.55m

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Seite 11

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

𝑊 𝑎 · 𝐵 𝑊

, 𝑊 ,

𝑏 𝑏 ⁄

  • 𝑊

,

𝑊 𝑜 · 𝐸 𝑊

𝑏 𝑊 𝑏

𝑜 · 𝐸

  • Fig.2: Schematic sketch of increasing total

areas 𝑏 around the structure footprint for the example of 𝑏.

6) Dimensionless areal - erosion / deposition

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Seite 12

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

𝑊

,

𝑊 𝑜 · 𝐸 𝑊

𝑏 𝑊 𝑏

𝑜 · 𝐸

  • Fig.4: Schematic sketch of increasing

incremental areas 𝑏 𝑏 around the structure footprint for the example of 𝑏.

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

  • 4) Dimensionless areal - erosion / deposition

𝑊 𝑎 · 𝐵

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Seite 13

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄

  • Fig.3: Global erosion / deposition volume 𝑊

around the structure, for each total area

6) Dimensionless areal - erosion / deposition

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Seite 14

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

  • 4) Dimensionless areal - erosion / deposition
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Seite 15

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

  • 4) Dimensionless areal - erosion / deposition
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SLIDE 17

Seite 16

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

4) Dimensionless areal - erosion / deposition

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

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Seite 17

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

4) Dimensionless areal - erosion / deposition

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

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SLIDE 19

Seite 18

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

4) Dimensionless areal - erosion / deposition

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

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SLIDE 20

Seite 19

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.5: Global erosion / deposition volume 𝑊

around the structure, for each incremental area 𝑏 𝑏

⁄ 𝑏 𝑏 ⁄

4) Dimensionless areal - erosion / deposition

𝑊

,

𝑊

, 𝑊 ,

𝑏 𝑏 ⁄ 𝑏 𝑏 ⁄

  • 2A

2.6A Similar global scour extends: Rudolph et al. (2004)

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SLIDE 21

Seite 20

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

𝐆𝐣𝐡. 𝟕: Bed topography of test 03 and 05, for 1D and 0D distance of nodes to the sea bed Test 03 Test 05

4) Volume differences for 0D and 1D node distance

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SLIDE 22

Seite 21

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.7: Volume differences in 𝑊

  • f test 3 and 5 with 0D and 1D distance of the nodes to the sea bed

𝑊

𝑊 , 𝑊 ,

5) Volume differences for 0D and 1D node distance

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SLIDE 23

Seite 22

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

Fig.7: Volume differences in 𝑊

  • f test 3 and 5 with 0D and 1D distance of the nodes to the sea bed

𝑊

𝑊 , 𝑊 ,

5) Volume differences for 0D and 1D node distance

12% higher erosion volume

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SLIDE 24

Seite 23

  • M. Welzel

ICSE Taipei, Taiwan - 07.11.2018

6) Conclusions

  • Dimensionless areal erosion and deposition volumes enable

different assessment to analyze repeating erosion patterns around structures.

  • Hydrodynamic transparent structure reveals significant global

scours, distance between the piles ~14D.

  • Dependent of the near bed structural blockage and disturbance.
  • Volume difference 1D and 0D, up to 12% higher erosion rates
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Seite 24

Thank you for your attention!

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