Measuring and control device for lysimeter underwater diving evaporation capacity

Abstract

The invention discloses a measuring and control device for the lysimeter underwater diving evaporation capacity. The measuring and control device comprises a lysimeter cylinder. The outer side of the lysimeter cylinder is provided with an overflowing water tank correspondingly matched with the lysimeter cylinder, a regulating water pipe is arranged at the bottom end of the lysimeter cylinder, the regulating water pipe stretches out of the lysimeter cylinder, a connecting valve is arranged at the end, stretching out of the lysimeter cylinder, of the regulating water pipe, the connecting valve is correspondingly communicated with the overflowing water tan through a water level communicating pipe, the overflowing water tank is correspondingly communicated with a water storage barrel through an overflowing water pipe, the water storage barrel is correspondingly connected with a water pump, the water pump is correspondingly communicated with the overflowing water tank through a water feeding pipe, a weighing balance is arranged at the bottom of the lysimeter cylinder, and an electronic scale is arranged at the bottom of the water storage barrel. By adopting the dynamic water overflowing principle, the long-term stable and unchanged constant water level is provided for the lysimeter, the water level metering device adopts the weighing principle, the evaporation water consumption of the lysimeter can be measured in real time, and the infiltration capacity of the lysimeter can also be measured.

Description

technical field [0001] The invention relates to the field of water conservancy facilities, in particular to a measuring and controlling device for submerged evaporation of a lysimeter. Background technique [0002] The lysimeter is a device for studying infiltration, surface runoff, underground runoff, evapotranspiration and other processes in the hydrological cycle. This kind of equipment is generally located in the open outdoor observation field or indoors with control devices, and can be set up individually or in groups or in sets. [0003] The lysimeter cuts out a certain depth of undisturbed soil column or artificially filled soil according to different soil types, and puts it into a cylinder with a closed circumference and bottom but equipped with a special drainage and water supply system. Pad with a certain thickness of anti-filter layer, and then hoisted and installed in the observation field. The surface of the soil sample contained in the drum must be flush with...

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Problems solved by technology

[0004] In the lysimeter submersible evaporation test, it is necessary to manually control the buried depth of the water level inside the lysimeter. The usual control method is to use a Martens bottle to provide a constant water level. The disadvantage of this control method is that it cannot be controlled when filling the lysimeter. Water level, every time the water is injected, it will cause great fluctuations in the water level. For large lysimeters, the water injection process is very frequent, so it brings a large water level error

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