SU809090A1 - Lesi meter - Google Patents

Description

(54) LYSIMETER

The device relates to ameliorative technique and can be used to study the water-salt and thermal conditions of soil grounds. A device is known for studying the total evaporation of groundwater into the aeration, infiltration and groundwater balance zones. The device has an evaporator case with a soil monolith connected to a water regulating device consisting of feed and discharge vessels with valves installed on the pontoon in the well 1. This device is cumbersome and does not objectively reflect the water-salt regime. A device is known for studying the water-salt regime of soil and ground, which contains a metal chamber with a monolith with a diameter of 1.5 m and a height of 2 to 6 meters, which is mounted on a pallet and is welded to it. In a meter or two from the camera, a measuring well of the camera is installed with a level sensor connected to it via a tray. A pipe is installed next to it to take water from the chamber. Water is added to the chamber from a measuring tank located on the surface of the earth through an exhaust valve with a mercury manometer and a recorder. The well is equipped with a system for controlling the level and measuring the flow of water 2. This device has a high inertia of water penetration from the pallet into the upper layers of the soil of the monolith enclosed in the lysimeter chamber, and in the presence of clay interlayers, the water will not go up, although in the well feeding the lysimeter chamber , the water will stand at a predetermined level, i.e. practically the results of measurements and the whole experience will be unreliable. In addition, the well associated with the soil grounds also does not reflect the level of natural waters, as it is isolated along the entire height from the soil grounds and is associated with them only from the lower end. The purpose of the invention is to increase the sensitivity of the device and reduce the inertia of water penetration. This goal is achieved by the fact that in the device containing a monolith chamber, measuring and compensating wells, equipped with a control system

the water level in the chamber and the level sensors, the measuring well is equipped with evenly spaced sleeves that connect it with the chamber, and the compensating well is equipped with evenly spaced filters along its height and connected to the measuring well through a metering pump.

The flow of water from the borehole of nature provides a salt exchange in the chamber of the lysimeter, respectively, with salt exchange in natural soil grounds. The value of the levels in the wells and the flow of water through the dosing pump is recorded by a recorder or other recording device.

The drawing shows a diagram of the lysimeter.

The lysimeter contains a chamber with a monolith, which is welded to the bottom of the pallet 2, connected by filter 3 with the measurement well 4 of the chamber.

Sensors 5 of temperature, rock resistance, density, humidity and other parameters are entered into the chamber. From the same. cells not occupied by sensors are sampled for various kinds of comparative analyzes.

The well 4 chambers and the well 6 of nature are equipped with movable sensors 7 and 8 levels and tracking systems 9 and 10. The metering pump 11 is connected by pipes 12 and 13 to wells 4 and 6. A tube 14 for radiometry sensors is inserted into the monolith of chamber 1. Chamber 1 is connected by sleeves 15 to well 4. Well 6 is connected along its entire height by filters 16 to natural soils and the bottom is equipped with filter 17.

The lysimeter operates in the mode of a predetermined water level in chamber 1 and in the mode of tracking the water level in the borehole of nature.

In the mode of a given water level in chamber 1, the lysimeter works as follows.

A level 7 sensor raises the track of system 9 to a predetermined level and, in the far-field, the metering pump automatically maintains this water level in well 4 by topping up water from nature well 6 or reflux. The same level is supported and. in chamber 1

lysimeter through the filter 3 and the sleeve 15. In the mode of monitoring the level of the nature of the well lysimeter works as follows.

Level 8 sensor is lowered to the level of natural waters in well 6 of nature, and

Level sensor 7 is installed in the well 4 chambers at the same level and the following systems 9 and 10 are turned on for synchronous operation, after which the dosing pump maintains the same water level in chamber 1, well 4 and well 6. Water from well 6 flows through the pump -batcher into well 4 and further through filter 3 and sleeves 15 into chamber 1.

Claims (2)

1. USSR author's certificate number 79158, cl. G 05 D 9/02, 1961. 2.Universal lysimetric installation of the ULU-74. Report Vsegageo, M., 1974, (prototype). L 73 / k7 o - / 7 O- a:. -about .