Apparatus and method for measuring line source inflow of soil infiltration performance

Abstract

The invention discloses an apparatus and method for measuring the line source flow of the soil soaking-in function. The apparatus comprises a constant water-providing tank, a water-distributing device, a soil groove, a rule and an image device. The method comprises the following steps: 1) sieving the air-dry soil and measuring the initial water ratio of the soil sample; 2) putting the soil samplein the soil groove; 3) adjusting the soil groove to the given height altitude; 4) putting the water distributing device on the soil surface of the soil groove to distribute the water; 5) recording theearth advancing area at different times by the image device; 6) recording the providing water and the soil dewing area image every section of time; 7) obtaining the corresponding dewing area by computing the image sheet; 8) obtaining the soil soaking-in ratio in different times by the computing formula.

Description

technical field [0001] The invention relates to a device and method for measuring soil infiltration performance, in particular to a line source inflow measurement device and method for soil infiltration performance. Background technique [0002] Soil moisture infiltration refers to the process of water entering the soil and is an important part of the field water cycle. Soil infiltration is important in practice, as it determines how quickly rainwater or irrigation water can enter the soil, as well as the amount of runoff from the soil surface and the risk of soil erosion during heavy rainfall. If the soil infiltration performance is small, the water budget of the plant root layer will be affected. To manage the moisture status of field soil, the quantitative relationship between soil infiltration performance and soil properties is very important. [0003] The infiltration capacity of soil to water is often measured by infiltration rate, and sometimes by cumulative infiltr...

AI Technical Summary

Problems solved by technology

However, these methods still have shortcomings

[0009] Such as literature 1: Scott, H.Don, 2000, Soil Physics, Iowa State University Press, Ames, and literature 2: Aneau, J.L.J., J.P.Bricquet, O.Planchon, C.Valentin. Soilcrusting and infiltration on steep slopes, in northern Thailand. European Journal of Soil Science, 2003, 54: 543-553., and Document 3: A1-Qinna, M.I., A.M.Abu-Awwad. Infiltration rate measurements in arid soils with surface crust Irrigation Science, 1998(1): 83-89 The technology disclosed in .: In the double-ring infiltration instrument, the double-ring is two concentric rings with different diameters (made of steel plate or hard plastic plate to ensure sufficient rigidity so that it can be driven into the soil without deforming the ring) .During the experiment, drive two rings into the ground concentrically, and then inject water into the two rings, keep a fixed water depth inside and outside, the inner ring controls the experimental area, and attaches a measuring needle as a fixed mark. Side seepage of infiltration water flow. First use the quantitative water addition method to record the time interval of water addition. Then use the regular water addition method to record the amount and time interval of water addition in the inner ring. Add water to the outer ring at the same time without metering, but note that the water surface of the inner and outer rings is roughly equal. Use The recorded water volume (volume) added per unit time of the inner ring is divided by the area of ​​the inner ring to obtain the infiltration rate (mm / min), and then the infiltration capacity curve is drawn from the infiltration rate at each time. However, the disadvantages of the above method are: It cannot be used on slope land; when the double ring enters the soil, it will damage the soil structure, especially the topsoil, and at the beginning of the test, when adding water to the double ring, it is easy to damage the topsoil structure, which changes the properties of the soil and makes the measured infiltration performance It cannot truly reflect the properties of the measured soil; at the same time, double-ring infiltration is pressurized infiltration; in the initial stage, due to the limitation of water supply orifice flow capacity, it cannot meet the requirements of sufficient water supply, and it is inconvenient to quantitatively study the initial soil infiltration process.

However, the disadvantages of this method are: the initial high infiltration capacity of the soil cannot be measured due to insufficient water supply; when the rain intensity is large, the soil structure will be destroyed; and because the initial infiltration rate of the soil is large, the simulated rainfall It is also impossible to achieve sufficient water supply with the method and therefore cannot measure the initial infiltration performance of the soil

Moreover, according to relevant experiments, the amount of water required during the experiment generally exceeds 2500L, which is a large amount of water.

[0011] Other known methods, such as the Mario-double-ring method, are improvements of the double-ring method. Although the accuracy has been improved compared with the double-ring method, the device is more complicated, so its application, especially in the field, still has limitations.

[0012] To sum up, the known prior art has the disadvantages of complicated devices, too much water consumption for the experiment, and a long duration, which make these methods have great limitations in the practical application in the field.

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