An Experimental Study Of Concentration Distribution Discharged From The Vertex Of Angular Area

Water is irreplaceable natural resource, while still supporting the ecological system. It is vitally important in the economic construction , social development and people's life etc. But owing to the influence such as mismanagement, lacking resources, environmental change and insufficient of the infrastructure investment, there are about 1.1 billion people lack safe drinking water and 2.6 billion people lack basic sanitation in the world. At the same time, water pollution is further encroached on a plenty of water which is not be polluted, and harming human's health. The polluted water is badly influencing on agriculture, industry, fishery, human health and the environment balance etc. Quality problem must be solved because it has affect the reasonable exploitation and utilization of water resources. The shortage of water resource and ecological environment deterioration has become an important factor to restrict the development of national economy. Water environment protection has become the main tasks in the world.Generally, the topography of water bank is tilt slope , drain outlet on the shoreside ,the lateral and vertical diffusion coefficient would have some different. Now when research emission vertical and horizontal generally ignore the diffusion coefficients influence and result produce deviation to the research results. In this thesis ,considering the difference of horizontal and vertical diffusion coefficient from shore vertex blowdown diffusion on shore, the library pollutant concentration distribution theory, based on that design and manufacture the vertical 2-d changing slope pollution diffusion experiment device.Carry on the experiment of different angular domain inside Angle and different diffusion coefficient ratio under the condition of transient emission vertices developing the screen oscillation system which can make water turbulance . In the experiment, the system can operate stable repeat the same intensity, produce the approximation of the isotropic turbulence, it can be discussed by vibration grille turbulent pollutants in water in the turbulent diffusion. To solve the question of concentration measurement in deep water, providing a new measuring method -- the digital image processing technique. Compared to other measuring method the advantage of Digital image processing technology include : not to contact the concentration field; get the concentration in different place at the same time ; can observe the change of concentration easily, etc. The treatment process of this method include to change images into greyscale, filtering processing, throwing away impression and drawing concentration line. Using MATLAB to write the program of digital image processing system. Using the tracer to simulate the pollution in water. Taking Photos to get the concentration diffusion image in the specific times and then using digital image processing techniques to obtain two-dimensional isoconcentration contour map of pollutant concentration. To analysis the Experiment results, obtain the diffusion coefficient and checking the horn shape's concentration distribution whenβis natural.This paper combining with rivers of water environment pollution control and the water environment function division to research encounter important research based on environmental hydraulics scientific questions. For the lateral and vertical diffusion coefficient of unequal condition, using the tracer diffusion experiment research tilt shore pollutant concentration distribution. For rivers and reservoirs with water environment pollution control function divisions, lateral and vertical diffusion coefficient calculation, the pollution of the mixed zone calculation, the outle would be a very broad application prospect.