A device and method for in-situ real-time measurement of sediment concentration gradation in natural rivers

Abstract

The invention relates to a device for performing in-situ real-time measurement on natural river silt concentration gradation, and belongs to the technical field of in-situ environment monitoring. The device comprises an underwater shell, an encoder and a computer, wherein the underwater shell is closed underwater measuring equipment; the encoder and the computer are arranged on a carrier above a measured water body; a transparent planar viewing window is formed in the wall of the side surface of the underwater shell; the measuring equipment consisting of an annular LED light source, a micro-lens and an industrial camera is fixedly installed at the planar viewing window inside the underwater shell; the micro-lens is coaxially installed on the industrial camera; both the industrial camera and the annular LED light source are aligned with the viewing window; the top end of the underwater shell is connected with the encoder through a cable; the measuring equipment inside the underwater shell is connected with the computer through a data wire. A method performing in-situ real-time measurement on the natural river silt concentration gradation comprises the following specific steps: demarcating the measuring device, and performing in-situ real-time measurement on the natural river silt concentration gradation. The device has the advantages of relatively high precision, convenience in use and relatively low cost.

Description

technical field [0001] The invention belongs to the technical field of environmental in-situ monitoring, in particular to an in-situ real-time measuring device for sediment concentration gradation in natural rivers. Background technique [0002] The concentration and gradation of sediment suspended in water in natural rivers are important hydrological and environmental parameters of rivers. The particle size of suspended sediment particles in natural rivers is mostly below 0.2 mm. At present, there are various methods such as sampling analysis method, optical detection method, acoustic detection method and image method to obtain sediment concentration or sediment gradation. [0003] The sampling analysis method is a traditional method, using a sampler to collect water samples directly from the river, and analyze the concentration and gradation in the analysis room. This method has high measurement accuracy, but requires special equipment, and the measurement efficiency is l...

AI Technical Summary

Problems solved by technology

The device calculates the sediment concentration and gradation by taking the particle images in the thin layer of water between two pieces of glass. The upper and lower glass pieces are staggered back and forth to replace the measured water body. However, when the glass pieces are staggered, the surrounding flow will be affected. It is difficult for sediment particles to enter between the glass sheets, and due to the effect of the viscous force of the water body, fine particles of sand will adhere to the immovable glass sheets, so that the water body entering between the glass sheets is different from the original water body, so The data measured by this method can hardly reflect the real situation

[0009] In addition, there are some methods that are rarely used, such as B-ultrasound imaging to measure the sediment concentration with low sediment content, and remote sensing image interpretation to analyze the sediment concentration. more details

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