SU809085A1 - Lysi meter - Google Patents

Description

(54) LYSIMETER

one

The device relates to ameliorative technique and can be used to study the water-salt and thermal regimes of soils.

A device is known for studying the total evaporation of groundwater into the aeration, infiltration and groundwater balance zones. Such a device has an evaporator case with a soil monolith, connected to a water regulating device consisting of feed and discharge vessels with valves and mounted on a pontoon in well 1.

The closest technical solution to the present invention is a device for studying the water-salt regime of soil and ground containing a working chamber connected by a branch pipe with a well in which the first level sensor is located connected to the level control unit 2.

However, the known device does not allow measuring the drying and swelling of the soil in the chamber during irrigation, water is taken from random sources and into the chamber is taken from the measuring tank, which

distorts the natural salt regime and does not accurately measure the water consumption for evaporation and infiltration. In addition, temperature and resistance sensors have unreliable contact with the measured medium.

The purpose of the invention is to eliminate these disadvantages, increase the sensitivity, efficiency and accuracy of the device.

This goal is achieved by the fact that the lysimeter contains a cylinder of elastic material installed coaxially to the working chamber, a level and flow measurement unit compensating a well with a second sensor installed in it

the level associated with the unit for measuring the level and flow of water, wherein the cylinder of elastic material forms with the working chamber an annular cavity connected by a valve to the atmosphere and a connecting pipe with a compensating well.

Claims (2)

As the monolith shrinks or swells, the annular cavity is filled with water from the compensating well or vice versa, and the water flow is measured by a level sensor and recorded on a recorder or other device. The water flow in the chamber is measured through the well of the chamber and the level control unit with a level sensor and a pump feeder pumping natural water into the chamber and back. The drawing shows the scheme of the proposed lysimeter. The lysimeter contains a chamber 1 with a monolith, a cylinder 2 of elastic material is placed inside the chamber, which is hermetically clamped around the top and bottom circumferentially by flanges 3 and 4 and forms an annular cavity 5 with the chamber walls connected by nozzle 6 with a compensating well 7 and the valve 8 with the atmosphere. Chamber 1 through the lower flange 4 welded to the pallet 9, containing inside the filter 10, through which chamber 1 is connected by nozzle 11 to the well 12 of the chamber, is equipped with a control unit 13 with the first level sensor 14 and the metering pump 15 topping up or withdrawing water from the well 12 through tube 16. The compensation well 7 of the annular cavity 5 is equipped with a level and flow rate measuring unit 17 with a second level sensor 18. In the soil monolith in chamber 1, sensors 19 for salinity temperature and other parameters and a well 20 for radiation and other measurements are laid. The tube 21 connects the metering pump 15 to the groundwater. The proposed lysimeter works as follows. When the soil monolith monolith shrinks or swells in chamber 1, the volume of the annular cavity 5, which is pre-filled with water through the compensating well 7 and the valve 8, decreases or increases. When the volume of the annular cavity changes, the water level in the well 7 is measured, as noted in the recorder or other The recorder through the unit 17 for measuring the level and flow rate of the well. The well 12 of the chamber serves to maintain the water in chamber 1 at a predetermined level. For this, the first level sensor 14 is manually set to a certain position, whereby the metering pump 15, at the command of the control unit 13, maintains this water level in the chamber well and through the branch pipe 11 in the chamber itself. . Claims of invention The lysimeter contains a working chamber connected by a branch pipe with a well in which a first level sensor is located connected to a level control unit, characterized in that, in order to increase the accuracy of the lysimeter, it contains a cylinder of elastic material installed coaxially to the working chamber level and flow rate, a compensating well with a second level sensor installed therein associated with a level and flow rate measuring unit, wherein the cylinder of elastic material forms with the working chamber is an annular cavity connected by a valve Q with the atmosphere and a branch pipe with a compensating well. Sources of information taken into account in the examination 1. USSR author's certificate number 79158, cl. G 05 D 9/02, 1961. 2. USSR author's certificate number 423106, cl. G 05 D 9/02, 1971 (prototype).