Simple type underground water constant compensation lysimeter

Abstract

The invention discloses a simple type underground water constant compensation lysimeter, comprising a water supply metering device, a water level regulation and control device and a lysimeter testing tank, wherein the water supply metering device is connected with the water level regulation and control device through a guide pipe; the water level regulation and control device is connected with a water inlet of the lysimeter testing tank through a communicating pipe; the water supply metering device comprises a Marriotte bottle with scale marks, a water supply pipe and an overflow pipe; the upper end port of the overflow pipe is flushed with the highest scale of the scale marks of the Marriotte bottle; the upper end port of the guide pipe is flushed with the undermost scale of the scale marks of the Marriotte bottle; the water level regulation and control device comprises a water control bottle and an aeration pipe which communicates the water control bottle with the outside; a pressure regulation water line is arranged on the water control bottle; the lower end port of the guide pipe is flushed with the pressure regulation water line; and the upper part of the lysimeter testing tank is backfill, the lower part of the lysimeter testing tank is a water storage layer, and the junction of the backfill and the water storage layer is a constant water line. The simple type underground water constant compensation lysimeter can realize regulation and control of constant water level and metering of water supply and drainage, and has the advantages of stable regulation and control of water level, timely water compensation and high metering accuracy.

Description

technical field [0001] The invention relates to the field of soil data measuring devices, in particular to a simple groundwater constant level compensation lysimeter. Background technique [0002] The water supply mode of the lysimeter is divided into surface water supply and underground water supply. The structure of the surface water supply lysimeter is simple, and the water supply can be controlled according to the soil moisture status, and the water supply, soil water storage and soil seepage can be directly measured. Most lysimeters belong to the underground water supply mode. Through the water storage layer at the bottom of the lysimeter, the capillary force of the soil is used to transport water to the root of the plant for its absorption and utilization. The underground water supply of the lysimeter is set to simulate the constant groundwater of plant growth. , so the constant water replenishment of the lysimeter aquifer is the key to monitor the water dynamics of pl...

AI Technical Summary

Problems solved by technology

Mechanical water level control can realize automatic water replenishment without power supply, and has a wide range of applications, but the fixation and sealing of the water level control device are the main factors that limit the accuracy of water level control, and its maintenance frequency is relatively high

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