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.