Method and device for measuring saturated soil water flow direction and flow rate based on thermal pulse principle

Abstract

The invention relates to the measurement technology field and especially relates to a method and a device for measuring a saturated soil water flow direction and a flow rate based on a thermal pulse principle. The device comprises an integrated pedestal (1), an X-direction first temperature probe (2), a Y-direction first temperature probe (3), an X-direction second temperature probe (4), a Y-direction second temperature probe (5), a heating probe (10) and a measuring device. A water flow direction is measured through two groups of X-direction and Y-direction probes which are vertical to each other, and an actual water flow direction is vectorially synthesized so that the water flow of the saturated soil water in any directions can be measured, and the soil water flow direction and the flowrate can be accurately measured too. The measured saturated soil water flow rate is accurate.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method and a device for measuring the flow direction and velocity of saturated soil water based on the heat pulse principle. Background technique [0002] Soil is generally composed of three phases: solid phase (soil particles), liquid phase (soil water) and gas phase (gas contained in soil). When the voids of soil particles are completely filled with liquid phase, the soil is called saturated soil water; otherwise, it is called saturated soil water. It is unsaturated soil water. Therefore, saturated soil water is a two-phase soil, that is, solid phase and liquid phase; unsaturated soil water is a kind of three-phase soil, that is, solid phase, liquid phase, and gas phase. Since there is no gas in saturated soil water and its soil properties are stable, researchers often use saturated soil water for soil hydraulic research. [0003] In order to find effective means to re...

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Problems solved by technology

[0021] The theoretical model of the maximum dimensionless temperature difference method between upstream and downstream is very mature, but its limitation is that the direction of the water flow velocity must be in the same direction as the straight line where the three probes are located, that is, the direction of the maximum flow velocity, in order to obtain a more accurate water flow velocity

However, in the actual measurement of soil water flow rate, due to the complex composition of the soil, the direction of water flow in the soil cannot be determined in advance, so the direction of water flow cannot be guaranteed to be in the same direction as the straight line where the three probes are located during measurement, resulting in the error of water flow rate measured by this method larger

Therefore, the above method can neither measure the flow direction of soil water nor obtain accurate soil water flow rate

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