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Delft3D User Meeting
Delft, 03 November 2016
Ingrid Holzwarth
Levin Nickelsen
Untrim2 and D-Water Quality for estuarine biogeochemical modeling
An example from the Elbe (Germany)
Image: Extract of nautical chart ‘Nordsee‘ (2011)
Bundesamt für Seeschifffahrt und Hydrographie
Delft
www.baw.de |
Motivation: estuarine management
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 2
Year Year
mio m3
Development of the amount of maintenance dredging in the Elbe Estuary Diagram: Water and Shipping Administration (WSV), modified. Download https://www.portaltideelbe.de
2010 2011
End of winter
Early May
Late June
Early August
Begin of winter
Measurements from FGG Elbe (www.fgg-elbe.de, download on
30/11/2013)
Interdependencies
and
Restrictions ?
www.baw.de |
Mid-term:
Integration of ecological restrictions on sediment management and
estuarine development
Long-term
Feedback between abiotic and biotic processes for a more realistic
simulation of estuarine sediment transport
Motivation for model development
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 3
www.baw.de |
Untrim2
… produces input files for D-Water Quality
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 4
Untrim2 (CASULLI & STELLING)
computational grid with subgrid bathymetry
Hydrodynamics
Conservative transport
(salt, water temperature, SPMi)
D-WAQ input files
WAQ.utromp2009.vol
WAQ.utromp2009.dat
WAQ.utromp2009.hyd
WAQ.utromp2009.are
WAQ.utromp2009.flo
WAQ.utromp2009.poi
WAQ.utromp2009.srf
WAQ.utromp2009.are
WAQ.utromp2009.vdf
WAQ.utromp2009.atr
WAQ.utromp2009.nc
WAQ.utromp2009.sal
WAQ.utromp2009.tem
WAQ.utromp2009.ssc
Casulli, V. and Stelling, G. S. (2010) Semi-implicit subgrid modelling of three-dimensional free-surface flows,
Int. J. Numer. Meth. Fluids, 67
www.baw.de |
Untrim2 and D-Water Quality
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 5
Source: BAW 2016, file Untrim_DWAQ_dataflow.png
www.baw.de |
Uniform post-processing
based on UGRID CF NetCDF files
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 6
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www.baw.de |
Uniformly post-processed files
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 7
Source: BAW 2016, Levin Nickelsen & Günther Lang
Hydrodynamic key figure:
mean tidal range [m]
Period of high oxygen concentration [d]
WQ key figure:
Time period exceeding an O2-threshold [d]
www.baw.de |
Basic study on relevant estuarine processes
Idealized estuary geometry: funnel shape with 1D-x resolution. Background: topography of the Elbe estuary (as used in: Sehili, A., Lang, G., and Lippert, C. (2014): High-resolution
subgrid models: background, grid generation, and implementation, Ocean Dynamics, 64, 519–535, doi:10.1007/s10236-014-0693-x)
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 8
www.baw.de |
D-Water Quality
Biogeochemical configuration
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 9
www.baw.de |
Model skill:
Dissolved oxygen concentrations at specific positions
S1 (Bunthaus): directly upstream of the Port of Hamburg S2 (Seemannshöft): in the Port area Measurements provided by: Institut fuer Hygiene und Umwelt; licence: dl-de/by-2-0 (www.govdata.de/dl-de/by-2-0); www.wgmn.hamburg.de
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 10
www.baw.de |
Model skill:
Longitudinal (helicopter) transects
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 11
Measurements from FGG Elbe (www.fgg-elbe.de, download on 30/11/2013)
Profiling on 06 Aug 2013 Picture: Ingrid Holzwarth
www.baw.de |
Model skill:
Longitudinal (helicopter) transects
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 12
Measurements from FGG Elbe (www.fgg-elbe.de, download on 30/11/2013)
www.baw.de |
Sensitivity study
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 13
max growth rate (d-1) mortality (d-1)
nitrification (mmol m-3 d-1) mineralization POC1 (d-1) mineralization DOC (d-1)
Dependency of
the absolute DO
minimum on
several model
parameters.
Grey area
indicates
common range
found in
literature.
our value
www.baw.de |
Sensitivity study
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 14
max growth rate (d-1) mortality (d-1)
nitrification (mmol m-3 d-1) mineralization POC1 (d-1) mineralization DOC (d-1)
Dependency of
the absolute DO
minimum on
several model
parameters.
Grey area
indicates
common range
found in
literature.
our value
www.baw.de |
Mass balance output: DO fluxes per process
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 15
2011 Primary
production
Mineralization Nitrification Reaeration Sum of all
Jan/Feb 0.1 -5.8 -0.2 40.0 48.5
Mar/Apr 5.7 -24.3 -4.0 0.7 -11.2
May/Jun 16.7 -66.3 -15.4 25.7 -34.1
Jul/Aug 9.5 -67.1 -10.7 28.4 -35.7
Sep/Oct 1.6 -40.4 -6.3 25.9 -18.3
Nov/Dec 0.1 -11.7 -2.6 8.0 -2.7
Table: Mean volumetric DO fluxes in the freshwater zone between km-0 and km-120 in mmol m-3 d-1.
Sum of all contains all process fluxes and transport-related DO exchanges.
www.baw.de |
Longitudinal development of DO fluxes
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 16
Daily oxygen fluxes per surface area. ’Sum of all’ also includes advection fluxes which are not depicted in the plots.
www.baw.de |
Summary
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 17
Technical environment
Flexible model combination Untrim2 and D-Water Quality
Uniform post-processing based on UGRID CF NetCDF
Large-scale situation
Dominance of heterotrophic processes in the Elbe Estuary
Riverine load controls the estuarine freshwater system
Upcoming work
Transfer to realistic 3D model
Integration of salt sensitivity and (bottom) sediment processes
Bundesanstalt für Wasserbau
22559 Hamburg, Germany
www.baw.de
Thank you for your attention
www.baw.de |
Additional material
Temporal aggregation for D-WAQ output
06-09-2016
Untrim2 and D-Water Quality| Ingrid Holzwarth & Levin Nickelsen| D3D User Meeting 03-Nov-2016
Page 19
WQ integration time step mΔt
n
N+1
n+m
N
UnTRIM2 time step Δt n+1
V n
V n+m
Qhn+θ
Qhn+1+θ
…
… Qhn+m-1+θ
1
0
WQ QQm
l
ln
hh t
Modified from: Günther Lang, UUM 2012, p.12, “Horizontal and Vertical Fluxes from UnTRIM2 Results”
