The paper analysed pertinence of prime contamination and transition disciplinarian of prime contamination along with time in a rainfall,based on road earth's surface radial flow water quality monitoring and experiment.It is open out that the road earth's surface radial flow water quality seasonal change disciplinarian.And then the preventive measure is put forword.
Pavement runoff pollution is more serious which brought more and more attention. Especially when the road passes through the first-grade surface sources protection zones and secondary reserve for domestic and drinking water, pavement runoff needs to be treatment. Pollutant control index achieve environmental quality standards for surface water (GB 3838-2002) before being discharged. In the vast literature at home and abroad about pavement runoff, this article expounds research status and the insufficiency on theory research and treatment measures of pavement runoff, discusses development trends in the future, and provides reference for the related research and engineering design. It is very necessary and urgent to study pavement runoff pollution and propose practical control measures)
By using a superluminescent diode as the light source and a depolariser inside the fibre coil, a constant scale factor is achieved without using polarisation control elements. For long-term behaviour an RMS-bias drift of 10 degrees/h is obtained.