Fine sand settling velocity detection method based on image grey

Abstract

The invention discloses a fine sand settling velocity detection method based on image grey. The fine sand settling velocity detection method comprises the following steps of: a, acquiring a detection device consisting of a settling container, a light source, a camera and a computer; b, performing grey-concentration calibration; c, performing image acquisition; d, performing concentration conversion; and e, calculating the settling velocity. The method is special for detecting the settling velocity of the group settlement silt in fine particle wash load type, the instantaneous settling velocity and the mean settling velocity of the sand in a sand river can be detected, and the method has the advantages that operation is easy and testing precision is reliable.

Description

technical field [0001] The invention relates to the field of sedimentation velocity measurement, in particular to a fine sand velocity detection method based on image grayscale. [0002] Background technique [0003] Studying the sedimentation velocity of river sand and then mastering the sedimentation law of river sand is of great significance for dredging of river channels and reservoirs. The traditional research on sedimentation velocity of river sand is generally aimed at the river sand with relatively large particles and the sedimentation velocity is basically evenly sinking. A sedimentation velocity measuring device with automatic measuring function and its method all belong to this category. For the flushing type sediment that is often suspended in the water, it is difficult to settle due to the suspension movement with the water flow, so it is rarely studied. [0004] Modern studies have found that in some large reservoirs and their upstream river sections, a larg...

AI Technical Summary

Problems solved by technology

Group settlement is quite different from single-particle settlement, and the interaction between particles and the influence of particle concentration on water flow characteristics need to be considered additionally. Therefore, there are few research results, and the understanding of its laws needs to be further improved, especially in the case of non-uniform silt. During the settlement process, flocculation may occur due to the influence of Brownian motion, differential settlement and water flow turbulence, which will greatly change the settlement characteristics. It is difficult to directly solve the settlement velocity based on theoretical analysis, and the Stokes formula is no longer applicable.

In the experimental research, plastic sand or coal powder is often used for finer silt, which is inconsistent with the real characteristics of silt.

Images