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...

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