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Decagon Webinar
Smart Field Lysimeters,
why and how do they work? Georg von Unold
27.03.2013
Soil Water & Interfaces
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Soilscience
Botany
Climate Change
Hydrology
Water Ressources Management
Irrigation
Plant Production
Fluxes of
Water and Solutes
in Soils Agronomy
Landscape Studies
Meteorology
Fields of Applikation
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• Introduction
• Technique
• Example
• Data management
27.03.2013
Coshocton, Ohio 1937
Lysimeters
But, how in soils?
„ Panta Rhei! “
„All is in a state of flux“ Heraklit, 550 – 480 a.D.
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Field setups, but …
27.03.2013 20 Jahre Wagna 7
Fluxes F1
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Defined cross-section Defined length
27.03.2013 20 Jahre Wagna 9
Atmospheric Interface: Any kind of precipitation Any kind of rain, hail, dew, Snow, hoar frost, …
F2
10
Infiltration & Soil water flux
F3
11
Groundwater recharge in wet seasons/snow melt, Positive water balance
F4
12
For gravimetric lysimeters: Groundwater = Zero Potential Lysim. Bottom = Zero Potential
F5
13
Capillar flux Dry seasons / Negative water balance Lysimeter getting to dry Due to missing connection to groundwater.
Fm 6
14
Fm 7
Fluxes are potential driven. Field matrix potential needs to be lysimeter matrix potential. We need to measure field condition and need to transmitt it into lysimeters
15
We need to control the lower boundary condition to reach true hydraulic field situations in lysimeters
F8
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• Introduction
• Technique
• Example
• Data management
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F9
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F10
Suction cup rake in big lysimeters
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F11
Suction cups In smart field lysimeters
Field setup
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TERENO 1m² Lysimeter
• Best results
• Heavy machines
• Long planning
• Higher expense
Lysimeter Station
Field Lysimeter
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• Undisturbed samples
• Soil column 30 cm, 60 cm, 100 cm
• Lower boundary control
• Precise weighing system
• Monitoring of water fluxes
• Water sampling
• Easy maintanance
• Easy removable
SFL, design
Smart Field Lysimeter
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Smart Field Lysimeters twin, triple, quattro
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• Small setup
• Full function
• No machines
• Flexible to demand
• Easy installation
• Low expense
Smart Field Lysimeter
27.03.2013
• Introduction
• Technique
• Example
• Data management
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Soil column cutting with jack lift device
Minimum impact
Installation in the alps
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Lysimeter suited
Lysimeter site at Italian alps
Installation in the alps
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• Introduction
• Technique
• Example
• Data management
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Data download and backup Data Pre Processing
Data management
Quality check procedures
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Quality check procedures
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Quality check procedures
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Quality check procedures
Data processing
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Evaporation & Precipitation
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Mass balances
Inj. = applied Bromid, V = vegetation loss, L = leachate, delta M (S) = Change of Mass, P = Precipitation, D = Drainage
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Thank you!