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Device and method for measuring dynamic soil water retention curve in laboratory

A technology for measuring dynamic and water-holding curves, which is applied in the fields of hydrology and soil science, can solve problems such as soil water-holding curves and unstable water level fluctuation signal cycles, and achieve the effects of eliminating uncertainty and improving efficiency and accuracy

Active Publication Date: 2019-08-27
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a device for measuring dynamic soil water-holding curve in a laboratory, which solves the technical problem of how to measure the soil water-holding curve when the groundwater level fluctuates and the cycle of the water level fluctuation signal is unstable; further provides a laboratory The method of measuring dynamic soil water holding curve solves the problems of experimental efficiency and accuracy

Method used

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  • Device and method for measuring dynamic soil water retention curve in laboratory
  • Device and method for measuring dynamic soil water retention curve in laboratory
  • Device and method for measuring dynamic soil water retention curve in laboratory

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The length and inner diameter of the soil column are 180 cm and 18 cm, respectively. The saturated permeability coefficient of the sand in the soil column is 2×10 -4 m / s, saturated water content and residual water content are 0.355 and 0.03 respectively, the van Genuchten parameters corresponding to the dry line are 2.3 and 10, and the corresponding van Genuchten parameters to the wet line are 3.91 and 10. The model of the data collector is Campbell CR3000, the model of the time domain reflectometer is TDR-315L, the model of the soil water potential sensor is UMS T5, and the model of the pore water pressure gauge is WIKA S-10. Specific steps are as follows:

[0038] S1. Add ionized water into the water tank until the water tank is full, turn on the switch of the water pump, pump the water in the water tank into the water level column, and check whether the water level generating system is leaking.

[0039] S2. Set the speed of the stepping motor through the computer ...

Embodiment 2

[0044] The difference from Embodiment 1 is only that the corresponding groundwater fluctuation period is 45 minutes.

Embodiment 3

[0046] The difference from Embodiment 1 is only that the corresponding groundwater fluctuation period is 90 minutes.

[0047] Such as figure 2 , 3, and 4 show that under three different periods of groundwater fluctuation signals, the soil water holding curve deviates from the static dry-wet curve.

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Abstract

The invention discloses a device for measuring a dynamic soil water retention curve in a laboratory. The device comprises a measuring system and a water level generating system, wherein the measuringsystem is connected with the water level generating system through a thin hose; a steel cable passes through a fixed pulley, one end of the steel cable is connected with the outer circular tube of a sleeve structure, the other end of the steel cable is connected with the rotating shaft of a stepping motor, and the stepping motor controls the lifting of the outer circular tube so as to control thelifting of the water level. The soil moisture characteristic curve can be measured when the ground water level fluctuates. The rotating speed of the stepping motor is controlled through a computer, asignal period generated by the water level generation system can be accurately and conveniently controlled, and meanwhile, the uncertainty of the traditional manual control period is eliminated. The invention also discloses a method for measuring the dynamic soil water retention curve in the laboratory. The method comprises the following steps: connecting a data collector with the computer, and then exporting the soil water content and water potential data measured by a time domain reflectometer and a soil water potential sensor at each moment, thereby improving the efficiency and accuracy ofthe experiment.

Description

technical field [0001] The invention belongs to the fields of hydrology and soil science, in particular to a device and method for measuring dynamic soil water holding curve in a laboratory. Background technique [0002] Unsaturated flow in soils plays an important role in many hydrological systems and processes, especially groundwater movement, rainfall runoff, evaporation and pollutant transport. The soil water characteristic curve describes the relationship between soil water content or saturation and matrix suction, and accurate measurement of soil water holding curve is the key to quantify the unsaturated flow in soil. For the same soil, even under static conditions, there will be two different soil water holding curves, that is, the dry line in the process of soil dehydration and the wet line in the process of water absorption. This phenomenon is called hysteresis. [0003] Existing studies have shown that the soil water-holding curve will be affected by groundwater l...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N1/28
CPCG01N1/28G01N15/0826
Inventor 罗照阳孔俊季智灵周晨琦姚昱婷韩笑
Owner HOHAI UNIV