Weighable Lysimeter
The new UMS monolithic weighable lysimeters are a tool for studies on water balance, substance conversion and solute transport determination. Due to the high precision weighing system all types of precipitation and drainage as well as ET and ET0 can be measured with a temporary high resolution of 0.01 mm.Thus, they are particularly suitable for studies on ground water regeneration, for model calibration and for all soil water related investigations.
Water balance
P + I – ET – D - ΔS = 0
Substance balance
Dep + F – V – L – ΔM = 0
Dep = atm. deposition
F = Fertilizing
V = Withdrawal by vegetation and and gaseous losses
L = Leaching/eluviation
ΔM = Change of matter content
Dep = P*Pc + I*Ic = D*Δc
D = Drainage/leachate water
P = Precipitation
c = Substance concentration
I = Irrigation
P + I – ET – D - ΔS = 0
Substance balance
Dep + F – V – L – ΔM = 0
Dep = atm. deposition
F = Fertilizing
V = Withdrawal by vegetation and and gaseous losses
L = Leaching/eluviation
ΔM = Change of matter content
Dep = P*Pc + I*Ic = D*Δc
D = Drainage/leachate water
P = Precipitation
c = Substance concentration
I = Irrigation
Four types of lysimeters with a standardized design are available with application-oriented construction, measurement equipment, handling and data tools, for hydrologic, climatologic, soil scientific or agronomic needs:
Design
The round surface of the Lysimeter has an extent of one square meter. The height of the monolith is one meter, respectively two meters for the Scientific-Field-Lysimeter.
With the x-y-z-dimensional suspension which is protected by utility model the annular gap between lysimeter column and ring housing will be only 10 mm after installation.
With the x-y-z-dimensional suspension which is protected by utility model the annular gap between lysimeter column and ring housing will be only 10 mm after installation.
Positioning a Meteo-Lysimeter
Installation of a Scientific-Field-Lysimeter
Field water potential linkage
Up to now gravity lysimeters assume the unlikely case that the water at the bottom is freely draining.
To achieve drainage rates identical to those in the field an array of SiC suction cups is installed inside the bottom area of the UMS lysimeters. The matrix potential measured in the field in a depth of 95 (195) cm is transmitted by a controlled pump to create a simulated ground water level inside the lysimeter.
To achieve drainage rates identical to those in the field an array of SiC suction cups is installed inside the bottom area of the UMS lysimeters. The matrix potential measured in the field in a depth of 95 (195) cm is transmitted by a controlled pump to create a simulated ground water level inside the lysimeter.
Installation of the suction cup array
Scheme of the suction cup array
UMS extraction method
A 4-cylinder synchronised hydraulic drive cuts the monolith. As the cutting edges can be visually controlled during the whole process any cavities, gravels or roots can be mended manually. This assures a perfect contact of soil and lysimeter cylinder.
The monolith then is lifted, turned and positioned with two centric bolts avoiding any deformation which could cause cracks.
The monolith then is lifted, turned and positioned with two centric bolts avoiding any deformation which could cause cracks.
Extraction of a Hydro-Lysimeter
Rotation of a Scientific-Field-Lysimeter
Ansprechpartner
Georg von UnoldTel: +49 89 12 66 52 - 15
Fax: +49 89 12 66 52 - 20
E-Mail: gvu@ums-muc.de
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