River bed elevation detection method and system based on ultrasonic reflection waveform

Abstract

The invention provides an ultrasonic and reflection waveform-based riverbed elevation detection method and system. The ultrasonic and reflection waveform-based riverbed elevation detection method comprises the steps of S1, receiving an ultrasonic digital signal of each sampling period after analog-digital conversion by an ultrasonic transducer arranged in a water body; S2, judging whether an ultrasonic and reflection waveform can be used for riverbed elevation and floating mud surface elevation analysis or not according to the ultrasonic digital signal, if not, returning to the step S1, if not, executing the step S3; S3, identifying moment when a riverbed reflection wave arrives at the ultrasonic transducer, and identifying moment when a floating mud surface reflection wave arrives at theultrasonic transducer; and S4, calculating riverbed and floating mud surface elevation according to the moment when the riverbed reflection wave arrives at the ultrasonic transducer and the moment when the floating mud surface reflection wave arrives at the ultrasonic transducer. By the method, accurate and reliable detection of riverbed elevation can be achieved, and the floating mud surface elevation can be simultaneously measured.

Description

technical field [0001] The invention relates to the technical field of water conservancy measurement ultrasound, in particular to a method and system for detecting river bed elevation based on ultrasonic reflection waveforms. Background technique [0002] The river bed is the geometric boundary of the water body of the river. It is usually composed of bedrock, pebbles and sediments, and is in a state of constant erosion or deposition under the action of water flow. The scouring and silting of the riverbed is manifested by changes in the elevation of the riverbed, which can have a serious impact on the safety and reliable operation of dams, bridges, water intakes, waterways and ports and other wading structures. Therefore, accurate detection of riverbed elevation is an important goal to be realized in hydraulic engineering. [0003] Underwater ultrasonic ranging is the main technology for river bed elevation measurement at this stage. The working principle of this technology...

AI Technical Summary

Problems solved by technology

At this time, using the threshold trigger method to determine the receiving time of the reflected wave will have the following disadvantages: First, the difference between the receiving time of the reflected wave determined by the threshold method and the real receiving time of the reflected wave is relatively large, which makes the measurement accuracy of the riverbed elevation low; The threshold method can only roughly measure the surface elevation of the sediment 230, and cannot obtain the surface elevation of the floating mud layer 220 that is more concerned in the project; third, the sediment in the water body is likely to cause rapid attenuation of the ultrasonic wave when it travels back and forth in the water, resulting in The reflected wave intensity is below the threshold and cannot be detected

The above deficiencies greatly restrict the accuracy, applicability and reliability of ultrasonic river bed elevation detection technology

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