coupling of the gkss suspended particular matter (spm) model with the dmi circulation model: bshcmod...
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Coupling of the GKSS Suspended Particular Matter (SPM) model with the
DMI circulation model: BSHcmod
Jens Murawski, Gerhard Gayer
WP6: YEOS Sediment transport model
• The development of a prototype of aYellow-Bohai Sea sediment forecasting system
• Task 6.5: Implementing and testing of the operational configuration of the GKSS-SPM model.
• First steps: Coupling of the GKSS-SPM model with the DMI circulation Model BSHcmod. Tests of the SPM-BSHcmod in the North Sea and Baltic Sea.
Whats done?
• Rewriting of the f77-SPM-subroutines to f90 language: SPM_module.f90.
• Numerical Implementation of the GkSS-SPM model into the DMI circulation model.
• Writing of Preprocessing skripts and tools to download and handle wave data.
• Modification of existing scripts to run the coupled SPM-circulation model, including preprocessing.
• First tests of the coupled SPM-circulation model in the North Sea / Baltic Sea using the operational setup provided by the GKSS.
Motivation, Features• Why? SPM is of particular importance for the eccosystem. It
regulates the penetration depth of light and influences the nutrients concentration in the water column.
• Where? The Suspendet Matter model is the collaborative development of the GkSS research center and the BSH (Gerhard Gayer et al. 2005).
• Processes? The regional circulation model (cmod) was extended by an Suspended Particulate Matter module to include vertical exchange processes (sedimentation, resuspension and erosion), bottom processes (consumption and bioturbation) and the horizontal redistribution of SPM due to currents and waves.
• Features? The new feature of the SPM model is the inclusion of wave effects into the description of the sediment dynamic. The SPM contribution of 79 rivers is included in the model.
• 3 suspended matter fractions: wsink(frac1)=0.0001 m/s
wsink(frac2)=0.00002 m/s wsink(frac3)=0.001 m/s
Modelled processes
zh
smu /01,0
smu /028,0
smu /0099,0
Z1 = 0,…,1mm
Z2 = Z1,…,10cm
Z3 = hero,…,10cm
Z4 = 10cm
hero = 0,…,10cm
transportvertical exchange vertical exchange
transport
resuspension
erosion
sedimentation
Bioturbation, diffusion
sinking
1. currents:
2. waves:
T
hHu Swave
)(~
wavecur uuu ,
UCu Dcur
Shear Stressvelocity
sinking
sedimentation
1 water column: SPM dynamic0.0001950.0003610.0003860.0004100.0004310.0004470.0004590.0004670.0004690.0004660.000458
0.0000460.000093
6.656.65
htt 100
2,08m 2,11m
From Sedimentation
to Resuspension
0.0004470.0004450t
0.0001910.0003650.0003910.0004170.0004400.0004600.0004750.0004850.0004900.0004890.000485
0.00.000098
6.656.65
0.0004780.000477 Increasing wave height,
constant currents
NEA: 24 nm, NS: 6 nm, BS: 1nm
Model domains and nesting
no SPM
SPM
const. bv
const. bv
SPM-configuration at the sea bottom
Global,medium range:
ECMWF
Regional,short range:
Hirlam
4x/day
Weather models
6
1
30
6 x 10
10
1,2 x 2
Wave model: WAM cycl. 4,Kitaigoroskii scaling
4x/day60h
River Inflow
Firth ofForth
Humber
Wash
ScheldtRhein
WeserElbe
q < 10 mg/lq > 10 mg/l
Scheldt 100 mg/lWash 60 mg/lHumber 55 mg/lFirth of Forth 48 mg/lElbe 38 mg/lWeser 35 mg/lRhein 30 mg/l
qTime
Vol
Time
mass
79 rivers
Cliffs
Suffolk 50 kg/sNorfolk 45 kg/sHolderness 58 kg/s
Suffolk
Norfolk
Holderness
English channel
Constant massInput rate at theSpecified gridpoints in theEnglish Channel(North Seaboundary) andat the Cliffs(Suffolk, Norfolk,Holderness)
First results:runtime 23 dayslonger forerunneeded
Next steps• More and longer test runs in the North Sea.
Comparrison of DMI model results with GKSS/BSH results.
• Going to the Yellow sea:
SPM bottom configuration map?
River loadings (annual variability)?
Const. coarse grid boundary values?
• Validation data Yellow-Bohai Sea?
• Data assimilation: Satellite information?
Thank you
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