Soil gas resistance measuring system and method

Abstract

The invention provides a soil gas resistance measuring system and a soil gas resistance measuring method, which are applied to the field of soil gas resistance research of agricultural hydraulic engineering. The system comprises a Markov bottle, a weighing sensor, a soil column, differential pressure gauges, a weighing sensor paperless recorder, a gas resistance paperless recorder and the like, wherein the Markov bottle supplies water to the soil column according to a preset water head; the soil column is filled with test soil in a layered mode from bottom to top, a plurality of pressure measuring pipes are arranged on the pipe wall of the soil column from bottom to top, and the positions of the pressure measuring pipes in the soil column correspond to the positions of soil air resistance measuring points in the soil column in a preset test scheme in a one-to-one mode. According to the invention, the plurality of differential pressure gauges are connected with the plurality of pressure measuring tubes one by one, so that the air resistance pressure data of the test soil at the corresponding positions of the plurality of pressure measuring tubes on the soil column can be measured at the same time, and the system has the characteristics of high automation degree and small data sampling time interval; and the plurality of differential pressure gauges are connected with the same air resistance paperless recorder, so that automatic recording of multi-path air resistance pressure data can be realized.

Description

technical field [0001] The invention relates to the research field of soil air resistance in agricultural water conservancy projects, in particular to a soil gas resistance measurement system and method. Background technique [0002] Natural soil is composed of solid, liquid and gas. In the case of rainfall or irrigation, the change of air and water in the soil is a game process of ebb and flow. When water enters the soil, part of the air will be imprisoned in the soil. Under the condition of flood irrigation, due to the accumulation of water on the surface, the gas in the soil cannot be discharged in time or the discharge is slow. The entry of water will inevitably occupy the space occupied by the soil and air. The air trapped in the soil and squeezed by water will produce a reaction force (gas resistance) that hinders the infiltration of water. It is manifested in that the rainfall intensity is relatively strong during the rainstorm period, and air resistance hinders wate...

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Problems solved by technology

[0003] At present, the measurement of soil gas resistance mainly adopts the connector hydraulic tube pressure measurement method, tensiometer pressure measurement method and pointer pressure gauge pressure measurement method, etc., but whether it is the connector hydraulic tube pressure measurement method, tensiometer pressure measurement method or pointer pressure The meter pressure measurement method, the measurement error caused by visual reading is relatively large, and the three methods all require manual reading, whether it is reading or electronic data sorting, the consumption of manpower and time costs is relatively large

At the same time, due to manual readings, the data sampling time interval is relatively large (as short as a few minutes, as long as tens of minutes or hours), and the data collection cannot be monitored in real time. Due to the large sampling time step, the collected data cannot be more realistic. reflect the changing process of soil air resistance, and may miss the key data of sudden changes in air resistance

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