Method and system for analyzing instantaneous sand transport intensity of pebble and gravel by image

Abstract

The invention discloses a method for analyzing instantaneous sediment transportation intensity of pebble gravels through images. The method comprises the following steps: continuously acquiring moving sediment images within a preset time period; generating a measuring section for each image; extracting the measuring section at the same fixed position of each image, and reconstructing the extracted measuring sections into a diachronic graph according the sequence of the acquisition time; acquiring the border of each sediment particle in the diachronic graph, and determining the position of the sediment particle in the diachronic graph; counting the number of sediment particles; acquiring the number of total frames and the sampling frequency which are acquired within the preset time period, obtaining the acquisition time according to the number of total frames and the sampling frequency, and according to the acquisition time, the number of the counted sediment particles with the area larger than a preset value as well as positions of the sediment particles, generating a sediment transportation-time graph so as to generate a sediment transportation intensity-time relationship curve. The invention further discloses a system for analyzing the instantaneous sediment transportation intensity of the pebble gravels through the images as well as a method for measuring the instantaneous sediment transportation intensity of the pebble gravels through a river engineering model.

Description

technical field [0001] The invention relates to a method and system for analyzing the instantaneous sand transport strength of pebbles and gravels through images. Background technique [0002] The river engineering model test is an important means of river research. It takes a representative section of the river as a prototype and scales it down to a certain scale to make a river model. Different river engineering models are used for different characteristics of the river, and then according to the actual river flow and sediment conditions, the water flow movement and sediment movement are reproduced on the river engineering model, thereby realizing the simulation of the actual river. Similar to the composition structure of the actual channel, the specific structure of the river engineering model can include the bank sub-model and the river bed sub-model; the river bed sub-model can include the fixed bed part of the river bed sub-model and the dynamic bed part of the river b...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional method of measuring the sand delivery rate of pebbles and gravels is: collect pebbles and gravels through a sand collector at the outlet of the water source of the river engineering model. Therefore, the time-averaged sand transport rate of pebbles and gravels cannot reflect the size change of the sand transport rate of pebbles and gravels, and the response to changes in water flow conditions cannot be reflected. The amount of sand received includes the amount of sand washed by the high head of the incoming water when the water is released

But there are problems: first, the location can only be placed at the outlet of the water source (because a deep groove needs to be dug at this location to put the sand collector into it), and the sand delivery rate at other sections in the tank cannot be measured; Under the condition of unsteady flow, when the pebbles and gravels are moving, there will be stops and starts during the process of transporting the pebbles and gravels to the tailgate sand receiver, which cannot reflect the relationship between the sand transporting movement and the water flow in time

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