Characteristics and project application of new high-precision steaming system for LY-UMS water level control in Australia
What you don't know - Australia's new high-precision steaming system for LY-UMS water level control
Germany UMS company has accumulated more than 20 years of experience in researching and promoting the lysimeter system, and introduced the water level control and water potential dynamic control lysimeter system LY-UMS. The scouring system can control the groundwater level, and can automatically adjust the water potential at the bottom of the lysimeter according to the water potential of the field outside the tank, so that the water potential at the same depth inside and outside the tank is the same, thereby ensuring the moisture migration in the lysimeter tank. The exchange is consistent with the outer body of the can. In addition, UMS has become a leader in foreign industry in terms of weighing system, tank structure design, tank adjustment tool design, tank material sampling cup, etc. We introduce our technology to domestic colleagues here, with a view to domestic Customers bring more convenience.
Main features of LY-UMS water level control high precision steaming system:
1. Fixed level control system
The traditional fixed water level sulphur infiltration system adopts an external type of supplementary drainage system. The control range of the groundwater level is limited to the height of the soil column. When the groundwater level is deep, it is necessary to increase the height of the soil column, which will inevitably reduce the level of the fine interconnector of the weighing system to maintain the water level inside the lysimeter. The limit of the method.
The LY-UMS system controls the water level of the lysimeter through a set of drainage systems. The make-up drainage system consists of a tensiometer installed at the bottom of the lysimeter, six SiC cups that can be filled and drained at the bottom of the lysimeter, and a 60L fill drain with weighing. The six SiC cups at the bottom of the lysimeter are made of 10mm pore size SiC, which makes the surface area of ​​the cup reach 360cm2, and the texture is hard and can bear the weight of tens of tons of soil. When the system is working, the bottom tension meter reading of the lysiton system is kept at a fixed value by hydration or drainage, so that the water level inside the lysimeter is fixed. The amount of water in the drain tank can be recorded and stored by the data collector.
2. Automatic water potential control system
The water potential parameter at the bottom of the column of the lysimeter is a necessary indicator to determine whether the soil column of the lysimeter is consistent with the actual situation in the field, and is also a key indicator affecting the plant growth environment in the soil column of the lysimeter. The bottom of the domestic lysimeter is generally treated with gravel and fine sand as the filter layer. The bottom water potential parameter cannot be obtained during use. In addition, the operation of the bottom year can cause the microbial environment at the bottom to be quite different from that of the tank.
The LY-UMS system's make-up and drain system can also be used for automatic control of the bottom water potential. When a tension meter is installed in parallel with the bottom of the lysimeter in the field, the internal immersion meter and the field water potential can be kept consistent by the automatic water supply system. Monitor the four-water conversion process in the natural state of the field. The technology has been recognized by various field stations in the European Union and has been widely used in the infiltration system of the European Research Station.
3. High-precision weighing system
The traditional domestic lysimeter is usually weighed by wire rope, lever, distance sensor, etc. After a long time of use, the weighing data drifts due to aging of the material, and the precision is lowered. The weighing system of the LY-UMS transpiration system is obtained by averaging the readings of three directly distributed load cells, which not only improves the accuracy, but also avoids the influence of wind on the measurement results. This technology ensures measurement accuracy of 0.01mm and allows for the study of rain, fog, frost, thawing and very small changes in evapotranspiration.
4. Round tank
Traditional domestic lysimeters usually use square tanks, while LY-UMS lysimeters use circular tanks that are common in foreign countries. Round tanks require higher production processes, but it is generally considered that the use of round tanks is more scientific. This is because, first of all, when the square tanks are taken from undisturbed soil, the soil is subjected to inconsistent extrusion, at the corners. The pressure is greater, resulting in the destruction of the structure of the soil, while the circular tank is evenly stressed; secondly, the corners of the square tank, root growth and soil moisture migration are affected, the round tank has no corners; Because the corner of the square tank is squeezed, a thicker tank is required. Usually, the square tank is made of 6mm thick steel plate, while the LY-UMS lysimeter uses 4mm stainless steel, which has less obstacle to heat exchange. The temperature inside the lysimeter is closer to the field temperature.
5. Tank adjustment
The LY-UMS sulphurization system has also developed an XYZ-type mounting frame for the installation of tanks. The lysimeter can be adjusted during installation and the lysimeter can be maintained in the XYZ three-way direction to avoid the effects of wind on the measurement system. This is the patented technology of UMS Corporation (Patent No. DPMA-Registered design No. 202004003181.7). UMS has also developed a device that can rotate the lysimeter without deforming the soil column tank. The original soil tool was developed by the German UMS company. The excavation lysimeter has obtained a patent for the original soil technology, which can effectively prevent it. The movement of water along the wall also prevents the soil near the tank wall from tightening.
6. Automatic solution sampling system
The LY-UMS lysimeter comes with a soil solution sampling system, and the sampling of the soil solution is done automatically by the system. The data of the automatic sampling pump can also be recorded in the data collector. Traditional lysimeter systems typically use manual sampling, which is time consuming and labor intensive, and timing sampling is not possible. VS-pro automatic sampling pump: built-in data acquisition, 1 or 2 vacuum outputs, continuous output or tension control. The T8, T4 and T5 tensiometers can be connected to control the negative pressure. High precision vacuum pump. With keyboard and color, backlight display screen, easy to set up and view. Long-term, continuous operation. For accurate pore water and leakage water sampling and sulphurization systems. rechargeable battery.
The main patent certificate obtained by LY-UMS sulphurization system
â— Lowest interaction interference sealing patent for weight measurement system
â— Simple load exchange unit, high-precision weighing system, patent against wind damage
â— True on-site temperature system, heat flux patent generated by true low thermal boundary control
â— Patent of snow water equivalent measurement system
â— Agricultural lysimeter patent
â— LY-UMS domestic and international project case show
Foreign project site :
1. Mountain evaporation station at an altitude of 1830 meters
The purpose of building a mountain steaming station in the Austrian Alps is to obtain detailed information on the water and nutrient status of the Alps, thus making it easier to understand the importance of drinking water supply to these areas.
Steaming station composition
â— Weighable osmosis measuring system
â— Soil solution sampler
â— Observation room is used to monitor soil profile
â— Weather station
2 , 2- soil column lysimeter station Professor Johann Fank of the Wagna University in Australia adopted the system, which includes:
Precisely weighable column, the above ground part can be used for traditional machine farming.
At the bottom of the lysimeter, the soil sample of the tonometer is sampled down to the boundary line between the groundwater and the soil water. The edge of the lysimeter is measured until the soil surface measures the undisturbed soil inside the lysimeter and the field, and the soil solution at different depths is obtained.
At the bottom of the lysimeter, the soil sample of the tonometer is sampled down to the boundary line between the groundwater and the soil water. The edge of the lysimeter is measured until the soil surface measures the undisturbed soil inside the lysimeter and the field, and the soil solution at different depths is obtained.
3 , 8- soil column steaming station
Professor Michael Gierig of the Bavarian National Water Authority uses the lysimeter station:
In April 2002, the 8-soil scouring system, located 40 km south of Munich, was put into operation at the Wielenbach station. The eight lysimeters are 1 meter in diameter and 2 meters deep. The purpose of this equipment is to measure how pollutants in contaminated areas penetrate into groundwater under actual conditions. The survey covers a wide range of pollutants, including heavy metals (such as arsenic, lead, chromium, cadmium, antimony) and many more. Acyclic aromatic hydrocarbons, etc.
In this program, UMS provides the design of the steaming station, civil construction and equipment. A lysimeter was installed in the floodplain to study the water flux and the migration of solute.
4 , 48- soil column lysimeter station
Dr. SaschaReth of the GSF Institute (Neuherberg) used the lysimeter station:
Including 48 lysimeters, each lysimeter has a soil surface area of ​​1 m2 and a depth of 2 m.
Accurate weighing system with an accuracy of 100g for determining water balance and changes in solid media
Sixteen lysimeters were equipped with radiolabeled materials, and some lysimeters were fitted with gas caps on top to measure volatile materials, eluent collection and analysis.
Domestic project application :
Item one:
Unit: Chinese Academy of Meteorological Sciences
Time: Jinzhou, 2008
Soil column specification: column height 1 meter, section 1 square meter
Item 2:
Unit: Heilongjiang Academy of Water Sciences
Time: 2009
Soil column specification: column height 2 meters, section 1 square meter
Item 3:
Unit: Grassland Institute, Chinese Academy of Agricultural Sciences
Time: 2011
Soil column specification: column height 1 meter, section area 1 square meter
Item 4:
Unit: Anhui Academy of Water Sciences
Time: 2011
Soil column specifications: column height: 4 meters, section area 4 square meters
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