Measuring system and method of moving mass sediment transport rate based on cross-correlation method

Abstract

The invention provides a bed load transport rate measurement system and method based on a cross correlation method. The measurement system comprises a water depth sounding device and a shore-based control device, wherein the water depth sounding device comprises a depth sounder hull, the depth sounder hull is mounted above an anti-collision floating ring through a supporting rod, and the bottom portion of the anti-collision floating ring is equipped with a pusher. The measurement method comprises steps that the section is measured through combination of field survey and remote sensing image design, and the measurement route of the water depth sounding device is set; continuous vertical underwater terrain measurement of a preset river section at two different time periods is carried out bythe water depth sounding device; the underwater terrain data is transmitted to the shore-based control device in a wireless mode, the sand wave moving speed and the average sand wave height are acquired through a terrain data analysis unit of the shore-based control device; the sand wave moving speed and the average sand wave height are substituted into a formula to acquire the single wide bed load transport rate, and observation and analysis of the bed load transport rate without disturbing the bed load transport process of natural river beds can be realized.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering experiments, in particular to a system and method for measuring the sediment transport rate of moving mass based on a cross-correlation method. Background technique [0002] Mass movement is one of the main forms of sediment movement in water flow, and it is also an important issue in sediment research. When the sediment is moving, the moving particles make various collective movements on the surface of the river bed, which makes the shape of the bed surface change from time to time with the different sand transport intensity. For mountainous rivers, the rolling, sliding or jumping of the moving mass along the surface of the river bed has a great influence on the shape of the river bed, so it is of great significance to study the sediment transport rate of the moving mass. Because the movement of moving mass often causes reservoir siltation and shortens the life of the reser...

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Problems solved by technology

The sediment transport rate is an important parameter of the mass movement, and its measurement is of practical value for the feasibility study of the project. However, the complexity of the sediment movement on the bed surface and its boundary makes it difficult to measure the mass transport rate.

In recent years, according to the conditions of laboratory tanks, different scholars have proposed a variety of high-precision observation methods for the rate of sediment transport. However, for the mass transport in natural rivers, due to the lack of more accurate measurement methods, The research of sand rate is difficult to be precise

[0003] At present, the observation equipment for mass transport in natural rivers at home and abroad is not perfect, or the sampling process has a large disturbance to the natural flow field, or the sampling efficiency is low

For example, the two types of pressure-difference type and net-type moving mass sampler methods commonly used in the past have certain resistance to water flow because the sampler body is placed on the surface of the river bed during sampling, which changes the original water flow conditions and sand delivery conditions, making Sampling and measurement will produce certain errors. At the same time, the sampler method can only be used to measure the average sediment transport rate in a certain period of time, and cannot realize the requirements of full automation and digitalization, nor can it measure the actual situation of transport quality

The sampling device of another type of pit measurement method has less disturbance to the natural flow field of the river during the sampling process and can obtain higher sampling accuracy, but it also has the following disadvantages: (1) when digging a pit to bury the pit measurement device, it is very difficult to It is difficult to ensure that the height of the top of the box is consistent with the height of the natural river bed; (2) The excavation process of the pit measuring device caused a certain degree of damage to the natural surface of the upstream river bed of the sampling section, which affected the sediment transport conditions

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