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FOCUS STEP 1 and 2 Simulations
Michael Kleinon behalf of the FOCUS working group on
Surface Water Scenarios,Fraunhofer-Institut, Schmallenberg, D,
presented at the 1st EU-Modelling workshop, Silsoe,UK
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Tiered Approach
• STEP 1: single application,fixed scenario
• STEP 2: multiple application,regional variation in Europe
• STEP 3: advanced modelling,specific European scenarios
• STEP 4: site specific calculation
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Step 1
No specific climate,minor croppingdifferentiation,topographyand soil scenario
Start STEP 1Worst caseloading
Use safe?yes
no, to STEP 2
No further work
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Soil & Water Body Scenario at Steps 1 (and 2)
30 cm
5 cm;5% ocBD = 0.8
1 : 5
Standard assumptions for water body andsediment
Water depth (cm): 30Sediment depth (cm): 5Sediment OC (%): 5Sed bulk density (g/ml): 0.8Ratio of field:water body: 5
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STEP1: Input into Surface water
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Step 1: Example Results
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Step 2
No specific climate,minor croppingdifferentiation,interception,topographyand soil scenario
STEP 2Loadings based onsequential applicationpatterns
Use safe?yes
no, to STEP 3
No further work
from STEP 1
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Soil & Water Body Scenario at Step 2 (same as Step 1)
30 cm
5 cm;5% ocBD = 0.8
1 : 5
Standard assumptions for water body andsediment
Water depth (cm): 30Sediment depth (cm): 5Sediment OC (%): 5Sed bulk density (g/ml): 0.8Ratio of field:water body: 5
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Regional Differences
North
South
(GD Residues)
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Regional difference
Location
% of application rate
spring summer autumn
North 1 1 4
South 2 1 4
Combined Drainage + Runoff
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STEP 2: Input into Surface water
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Assumptions and processes modelled
• Daily time step• Mass is conserved. PECsw and PECsed are
governed by processes of adsorption/ desorptionand degradation only
• Following drift events compound is partitionedinto sediment over a 1 day period
• At run-off/drainage event compound is partitionedbetween water and sediment at time of addition tosurface water
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Step 2: Example Results
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Models involved
STEPS1_2in FOCUS
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