A Simple Groundwater Constant Level 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 method of the lysimeter is divided into surface water supply and underground water supply. The surface water lysimeter has a simple structure and can control the water supply according to the soil moisture status and directly measure the water supply, soil water storage and soil leakage. Most lysimeters are underground water supply methods. The bottom water storage layer of lysimeters uses soil capillary force to transport water to the roots of plants for absorption and utilization. The underground water supply of lysimeters is set by simulating constant groundwater for plant growth. Therefore, constant replenishment of water storage layer of lysimeter is the key to monitoring plant water dynamics. [0003] In the prior art, the weighing lysimeter is widely used. It accu...

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 fixed and tightness of the water level control device is the main factor limiting the accuracy of water level control, and its maintenance frequency is relatively high

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