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. 本实验用示踪剂罗丹明B模拟污染物在水体中的扩散,拍照得到不同时间下物质的浓度场图像,将图像输入计算机进行处理,最终获得对应时间条件下浓度场的二维等浓度线图。