Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Faculty of Geosciences
River and delta morphodynamics
From milliseconds to centuries: long-term
coastal morphology modelle...
2
Introduction
Source: Rijkswaterstaat Vaklodingen
Introduction
3
Long-term morphology
Tides + Waves
Why?
Inlet enlargement
Diffusive morphology
Lack of channels
Erosi...
Wave shape
Not fully resolved in
morphodynamic models
Parameterized
4
Wave shape
Parameterizations:
Isobe & Horikawa 1982 (IH) – in Delft3D
■ Derived from experiments
■ 3rd Cnoidal + 5th Sto...
Wave shape
Intra wave orbital velocities: “Offshore”
IH -> Skewed?!
RUE -> Sin
6
Wave shape
Intra wave orbital velocities:
Shoaling zone
IH -> More Skewed
RUE -> Skewed
“Offshore”
IH -> Skewed
RUE -> Si...
Wave shape
Intra wave orbital velocities:
Surf zone
IH -> Skewed
RUE -> As/Sk
Shoaling
IH -> Skewed
RUE -> Skewed
“Offsho...
Sediment transport predictor
 Van Rijn 2004/2007
■ Bed load
■ Suspended load
Critical Shields
+
Non-linear term
Non-linea...
Model implementation
Implemented RUE into Delft3D source code
IH is the default parameterization
VR04 sediment transpor...
Cross-shore Non-Linearities
Swell wave: Hs=1m Tp=8s
skewness Sk/As As/Sk
skewness
sinusoidal
No asym
11
Model Forcing
Wave reduction
Wave reduction - energy
13 cases
~25 yrs measurements
IJmuiden munitiestortplaats <http://li...
Cross-shore Morphology
Default sediment transport values
10 yrs
Beach Envelop
Closure depth
“Scour”
Shoreline
13
Bed U Sus U
Total
ON
OFF
Cross-shore Sed. Transport
Yearly net transport
Default:
■ HIGH bed load [IH]
■ on/off unbalanc...
Cross-shore Morphology
100 yrs
15
10 yrs
Alongshore Sediment Transport
16/19
N
S
N
S
Bed V Sus V Total
15% 72% 15% 20%
Yearly net transport
Default:
■ IH higher ...
NOT Alongshore Uniform
Coastal Hump ~3.7Mm³
17/19
IH
RUE
Alongshore Sediment Transport
Volume diffusion
IH slower diffusion – littoral drift
18/19
IH RUE
Complex [shallow] morphology
19
Can we get it right?
Or closer to
Tidal Basin Morphology
Wave climate – 100 yrs
Xshore Calibrated values
IH - 20% RUE - 80%
20
21
Tidal Basin Morphology
“Same” (XShore) transport values – large differences!
Tidal Basin Morphology
Inlet, Channels and shoals
Ameland
Tidal Basin Morphology
Basin
IH overshallowing & diffusion
Inlet expansion
Channel infilling &
shallowing
Tidal Basin Morphology
Delta
RUE smaller delta [eroded barrier?]
IH diffusive morphology
Asymmetry/Skewness
Skewness
25
Conclusions
Tidal IH – 20%
RUE - 80%
Inlet enlargement
Diffusive morphology
Lack of channels
Erosion of flats
Conclusions
 “Same” transport -> [very] different [long-term] morphology
 Isobe Horikawa (skewness only)
 Higher XShore...
Upcoming SlideShare
Loading in …5
×

DSD-INT 2018 From milliseconds to centuries: long-term coastal morphology modelled with a new wave orbital motion parameterization - Boechat Albernaz

72 views

Published on

Presentation by Marcio Boechat Albernaz, University of Utrecht, The Netherlands, at the Delft3D - User Days (Day 3: Sediment transport and morphology), during Delft Software Days - Edition 2018. Wednesday, 14 November 2018, Delft.

Published in: Software
  • DOWNLOAD FULL BOOKS, INTO AVAILABLE FORMAT ......................................................................................................................... ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Be the first to like this

DSD-INT 2018 From milliseconds to centuries: long-term coastal morphology modelled with a new wave orbital motion parameterization - Boechat Albernaz

  1. 1. Faculty of Geosciences River and delta morphodynamics From milliseconds to centuries: long-term coastal morphology modelled with a new wave orbital motion parameterization Márcio Boechat Albernaz PhD Candidate – m.boechatalbernaz@uu.nl Gerben Ruessink Dirk-Jan Walstra Pieter Koen Tonnon Bert Jagers Maarten Kleinhans
  2. 2. 2 Introduction Source: Rijkswaterstaat Vaklodingen
  3. 3. Introduction 3 Long-term morphology Tides + Waves Why? Inlet enlargement Diffusive morphology Lack of channels Erosion of flats
  4. 4. Wave shape Not fully resolved in morphodynamic models Parameterized 4
  5. 5. Wave shape Parameterizations: Isobe & Horikawa 1982 (IH) – in Delft3D ■ Derived from experiments ■ 3rd Cnoidal + 5th Stokes Ruessink et al 2012 (RUE) ■ Derived from field measurements ■ Ursell number 5
  6. 6. Wave shape Intra wave orbital velocities: “Offshore” IH -> Skewed?! RUE -> Sin 6
  7. 7. Wave shape Intra wave orbital velocities: Shoaling zone IH -> More Skewed RUE -> Skewed “Offshore” IH -> Skewed RUE -> Sin 7
  8. 8. Wave shape Intra wave orbital velocities: Surf zone IH -> Skewed RUE -> As/Sk Shoaling IH -> Skewed RUE -> Skewed “Offshore” IH -> Skewed RUE -> Sin 8
  9. 9. Sediment transport predictor  Van Rijn 2004/2007 ■ Bed load ■ Suspended load Critical Shields + Non-linear term Non-linear Skewed based transport Uon & Uoff 9
  10. 10. Model implementation Implemented RUE into Delft3D source code IH is the default parameterization VR04 sediment transport (w/ intra wave) 10 2DH model 50 – 12 m resolution M2 tides SWAN wave model 200-250 µm sand 10-100 yrs 10-50 morfac
  11. 11. Cross-shore Non-Linearities Swell wave: Hs=1m Tp=8s skewness Sk/As As/Sk skewness sinusoidal No asym 11
  12. 12. Model Forcing Wave reduction Wave reduction - energy 13 cases ~25 yrs measurements IJmuiden munitiestortplaats <http://live.waterbase.nl> 12
  13. 13. Cross-shore Morphology Default sediment transport values 10 yrs Beach Envelop Closure depth “Scour” Shoreline 13
  14. 14. Bed U Sus U Total ON OFF Cross-shore Sed. Transport Yearly net transport Default: ■ HIGH bed load [IH] ■ on/off unbalance Calibration: ■ equal bed / sus ■ ON = OFF [total=0] 14 4.6 x bed load 15% 72% 15% 20% ON OFF
  15. 15. Cross-shore Morphology 100 yrs 15 10 yrs
  16. 16. Alongshore Sediment Transport 16/19 N S N S Bed V Sus V Total 15% 72% 15% 20% Yearly net transport Default: ■ IH higher than RUE (Xshore) Calibration: ■ RUE higher than IH!
  17. 17. NOT Alongshore Uniform Coastal Hump ~3.7Mm³ 17/19 IH RUE
  18. 18. Alongshore Sediment Transport Volume diffusion IH slower diffusion – littoral drift 18/19 IH RUE
  19. 19. Complex [shallow] morphology 19 Can we get it right? Or closer to
  20. 20. Tidal Basin Morphology Wave climate – 100 yrs Xshore Calibrated values IH - 20% RUE - 80% 20
  21. 21. 21 Tidal Basin Morphology “Same” (XShore) transport values – large differences!
  22. 22. Tidal Basin Morphology Inlet, Channels and shoals Ameland
  23. 23. Tidal Basin Morphology Basin IH overshallowing & diffusion Inlet expansion Channel infilling & shallowing
  24. 24. Tidal Basin Morphology Delta RUE smaller delta [eroded barrier?] IH diffusive morphology Asymmetry/Skewness Skewness
  25. 25. 25 Conclusions Tidal IH – 20% RUE - 80% Inlet enlargement Diffusive morphology Lack of channels Erosion of flats
  26. 26. Conclusions  “Same” transport -> [very] different [long-term] morphology  Isobe Horikawa (skewness only)  Higher XShore sediment transport – strong unbalance of transport modes  Over-calibration of transport magnitude (is it correct then?)  Decoupling of Xshore & Alongshore processes [Shoreline & Littoral drift]  Excessive morphological diffusion  Ruessink (skewness + asymmetry):  No need to over-calibrate transport due to correct hydrodynamic processes  Incision & Diffusion more balanced with nature and tidal (only) models  Overall morphology closer to observed in nature Márcio Boechat Albernaz PhD Candidate – m.boechatalbernaz@uu.nl 26

×