Dynamic display system for streak line in water flow and display method for streak line

Abstract

The invention discloses a dynamic display system for a streak line in water flow and a display method for the streak line. The system comprises a river engineering model, streak line trace particles, a camera and a digital image processing device. The method includes: spreading the streak line trace particles in the water flow; shooting the motion video of the trace particles by the aid of the camera; extracting single-frame particle images by means of processing digital images; extracting particle images by means of image segmentation; marking the positions of the trace particles in each frame of images in a current background image with a certain conspicuous color to form streak lines; and finally, converting each frame of processed digital images into a continuously played video to dynamically display the motion process of the streak line. The system is simple in structure, easy in setup and beneficial to popularization and use, and the method not only can be used for clearly displaying the streak line, but also can be used for dynamically displaying the change process of the streak line, and provides technical support for flood prevention, drought resistance, environmental protection and the like.

Description

technical field [0001] The invention relates to a display system and a display method of a flow trace line in a water flow, in particular to a dynamic display system and a display method of a flow trace line in a water flow, and belongs to the technical fields of hydraulics and river dynamics. Background technique [0002] The streamline is the flow trajectory of the fluid particles in the water flow in the continuous time process, and it is one of the important characteristics of the water flow movement. Especially for key issues such as channel regulation and river governance in river and coastal engineering, the determination of the streamline is crucial. important. However, since water is a colorless and transparent liquid, the dynamic visualization of flow lines has always been an important content in the study of water flow. [0003] At present, there are mainly two types of display methods for flow lines in water flow: the first type is to add colored dyes (such as i...

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Problems solved by technology

[0003] At present, there are mainly two types of display methods for flow lines in water flow: the first type is to add colored dyes (such as ink, potassium permanganate) to the water flow to form a colored water body, and the colored water body will show a flow trajectory during movement, and then The water flow trace can be recorded by taking pictures with a camera. In this method, the water flow is mixed with the added dye, which substantially changes the density, viscosity and other properties of the water flow, which has a great impact on the flow state. Moreover, due to the convection and diffusion of the water flow The flow traces formed are not obvious enough; the other is to spread tracer particles (such as paper scraps, plastic pellets, etc.) with good followability but not mixed with the water flow into the water flow. This method reduces the However, since the flow trajectory cannot be naturally formed during the movement of the tracer particles, the method of prolonging the exposure time of the camera to record the particle movement trajectory is usually used to display the flow line, but the flow line displayed by this method is usually blurred. And it's just a single photo, which can't show the dynamic changes of the flow line

[0004] In addition, in the prior art, the device for obtaining the flow line is only a camera, and the camera only acquires a single photo, which cannot display the dynamic changes of the flow line. Therefore, it is urgent to develop a device that can generate continuous images and dynamically display the flow line. device or system

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