Jaco van der Gaast The Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands 1 Water Management Tools Jaco van der Gaast The Winand Staring Centre Wageningen, The Netherlands A Spatial Solution to Calculate Optimum Surface Water Target Levels Using a Water Management Decision Support System
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Jaco van der Gaast The Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands 1 Water Management Tools Jaco van der Gaast The Winand.
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Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
1
Water Management Tools
Jaco van der Gaast
The Winand Staring Centre
Wageningen, The Netherlands
A Spatial Solution to Calculate Optimum Surface Water Target Levels Using a Water Management Decision Support System
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
2
Contents
• Introduction
• The model Swap
• Input Data
• Groundwater modeling
• Crop growth
• Results
• Conclusions
• Near future
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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IntroductionWMTools is a Water Management Decision Support System that integrates a hydrological dynamic model with ArcView GIS to provide decision support
for optimum water target-level calculations in relation with crop production for lowland areas.
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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IntroductionThe system combines high-resolution spatial
information
with time
and depth
dependent information.
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Swap: System definition
• Unsaturated and saturated top-soils
• 1-D column• Surface water
systems• Regional flow
as lower boundary
Crop evaporation
Precipitation
Crop growth
Drainage/infiltration
Seepage\percolation
Soil evaporation
Integrated modeling of the Soil-Water-Atmosphere-Plant system
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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transpiration
Saturatedzone
Plant
precipitation
soil-evaporation
Surface waters
Deep Groundwater
surface runoff
- Transport of:soil watersoil heatsolutes (salts, tracers)
- Influenced by:Water repellencySwelling and shrinkingHysteresis
interception
Swap: Integrated modeling of the
Soil-Water-Atmosphere-Plant
system
Atmosphere
drainage/subsurfaceinfiltration
drainage/subsurfaceinfiltration
deep percolation/seepage
Unsaturatedzone
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Input data
Elevation
Land use
Soil
Topography
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Data: High-resolution elevation data
• Laser scanning• Density of 1 point per 16m²
• Accuracy: STD 15 cm
Average error 5 cm
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Data: Surface water system• Interaction with surface water
• Multi-level drainage at regional scales
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Data: Surface water system
• Ditch density• Drainage
resistance• Drainage levels• Control unit
size• Weir
characteristicsRegional groundwater
flow system
Drainage tochannels
Drainage to (open)field drains
Drainage totrenches
saturatedsoil profile
avg
Local to sub-regional flow system
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Groundwater modeling
GIS-input:• Seepage• Surface
water
system• Soil • Crop• Meteo• Elevation
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Groundwater modelingRelationship between elevation and groundwater
Calculations for eight years on a daily basis
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Groundwater modelingRelationship between elevation and groundwater
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Conclusions
• The system can be used to optimize water target levels in order to optimize crop yields in lowland areas.
• The use of high-resolution spatial data makes the results more accurate.
• The combination of high-resolution spatial information with time and depth dependent information in one system, gives more and easier access to the information needed for analyzing the results.
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Conclusions• Groundwater
– High groundwater levels are almost not effected by elevation
– Low groundwater levels nearly follow the terrain profile
– Groundwater fluctuations decrease by increasing elevation
– The relation between groundwater level and elevation is affected by transpiration reduction
• Crop growth – Elevation and soil type are important factors for
crop yields
– Water management can change the optimum crop growth in relation with elevation
Jaco van der GaastThe Winand Staring Centre, P.O. Box 125, 6700 AC Wageningen, The Netherlands
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Near future• Automatic optimization • Crop rotation• Optimization on farm-company level• Nutrient-limited crop growth