Measurement method for low sand content based on B-type ultrasound imaging technology

Abstract

The invention provides a measurement method for a low sand content based on a B-type ultrasound imaging technology. The measurement method comprises the following steps of: directly imaging suspended sand grains in water by virtue of a B-type ultrasound instrument so as to obtain image information of the sand grains in the water at first, and then filtering background noise of images, extracting image areas or grey-level areas occupied by bright specks of the sand grains in the images, calculating the image area concentration or the grey-level area concentration of the sand grains, and finding a corresponding value according to a corresponding relationship between the image area concentration and an actual sand content or a corresponding relationship between the grey-level area concentration and the actual sand content, so as to obtain the to-be-measured sand content. Via the measurement method provided by the invention, the spatial concentration distribution and the dynamic movement process of the sand grains on a section can be reflected and measured in real time, and the intuitive and visible movement images and the concentration distribution rule of the sand grains can be provided for technicians in the related fields; and the measurement method has the advantages of being high in adaptability, good in timeliness, comprehensive in function, as well as convenient and fast to operate.

Description

technical field [0001] The invention belongs to the technical field of river port hydraulic model measurement, in particular to a method for measuring low sediment content based on B-ultrasound imaging technology. Background technique [0002] In sand research and river port hydraulic model tests, the sand concentration of the model section and its concentration distribution characteristics along the vertical line are of great significance to the study of sand movement laws and river bed evolution laws; at present, low sand concentration The measurement mainly adopts optical and acoustic methods. The most widely used is the optical turbidimeter, which is based on the principle of extinction to measure the concentration of suspended particles or sand content. It is mainly used for the measurement of turbidity in industrial occasions such as water plants. The measurement method is affected by the difference in light transmission characteristics of different materials and the p...

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Problems solved by technology

[0002] In sand research and river port hydraulic model tests, the sand concentration of the model section and its concentration distribution characteristics along the vertical line are of great significance to the study of sand movement laws and river bed evolution laws; at present, low sand concentration The measurement mainly adopts optical and acoustic methods, and the most widely used is the optical turbidity meter, which is based on the principle of extinction to measure the concentration of suspended particles or sand content, and is mainly used for the measurement of turbidity in industrial occasions such as water plants. The measurement method is affected by the difference in light transmission characteristics of different materials and the particle size of suspended particles, so it is not effective in the hydraulic model tests of river ports; in addition, the acoustic method is not yet mature in the measurement of low sediment content Relatively mature measuring instruments; and the above two measurement methods belong to point measurement, and cannot directly obtain the vertical distribution characteristics of sediment concentration; the spatial distribution and dynamic movement process of particle concentration are very important for the study of sediment movement laws and how to reflect the spatial distribution and dynamic movement process of the particle concentration in real time and comprehensively is also a difficult problem that has plagued the study of model test sediments for a long time.

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