Silt underwater repose angle measurement method

Abstract

The invention discloses a silt underwater repose angle measurement method. The silt underwater repose angle measurement method comprises the steps of adding silt on a circular truncated cone in a detection container through a funnel and forming a sand pile underwater, wherein the radius of the circular truncated cone is measured in advance. The silt underwater repose angle measurement method is characterized in that according to the theory of communicating vessels, height measurement is converted into water level measurement, that is, the liquid level is controlled to gradually drop to be flush with the top of the sand pile by controlling a water injection container communicated with the bottom of the detection container, the height of the sand pile is obtained by detecting the height of the water level from above the water surface, and then calculation is conducted to obtain a silt underwater repose angle. The method has the advantages that the adopted devices are simple in structure, the measurement accuracy is high, the fault tolerance is good, operation is easy and convenient, and control is convenient.

Description

technical field [0001] The invention relates to a sediment measurement technology, in particular to a method for measuring an underwater angle of repose of sediment. Background technique [0002] The angle of repose refers to the maximum angle measured when the particle is in a static state when the gravity and the friction force between the particles are balanced when the particle slides on the free slope of the powder accumulation layer in the gravitational field. In sediment movement mechanics, the underwater angle of repose of sediment particles is an important basic parameter that determines the characteristic values ​​of sediment deposition shape, bed surface shape characteristics, bed surface resistance, and slope stability characteristics. At present, the method of measuring the underwater angle of repose of sediment is the disc method, that is, through a metal disc, the sediment is piled up underwater, and then the disc is slowly lifted out of the water, and the sed...

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Problems solved by technology

[0005] However, when the device of this patent is filling water into the glass water tank during detection, the disturbance of the water flow will interfere with the sliding of the sediment. At the same time, during the detection, the floating plate and the funnel will rise with the water level during the formation of the taper of sediment accumulation, which will also greatly disturb the water flow. , affecting the formation of sediment accumulation taper, resulting in low detection accuracy of angle of repose

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