SNOW ACCRETION ON TRAFFIC-CONTROL SIGN BOARDS AND ITS PREVENTION

Visual observations of snow accretion on the sign board and continuous measurements of the wind velocity and the air temperature have been made in blowing snow. The flow and velocity distribution of wind around and on the surface of the board, respectively, was measured. The set of results show that snow accretion develops around the wind stagnation point of the board, that at a wind velocity exceeding 4 to 5 m/sec the board is covered even with dry snow which does not contain liquid water and that this dry snow accretion can occur more easily with increasing wind velocity with ascending air temperature and with decreasing area of the sign board. The dry snow accretion can be classified into three types. One of the most frequently observed among them is caused by strong collision of snow against the board. The snow accretion of this type can be explained in terms of snow melting at the contact points of snow and the board by the collision which transforms the kinetic energy of snow into internal energy of it and melted snow adheres to the board. Experiments for preventing snow accretion were carried out by three methods. Among them, the method of altering the wind flow is a comprehensive application of making shift the wind stagnation point, making snow collide against the board at an acute angle so that the snow accretion becomes more difficult. It is the most effective among the three methods and can be expected from the practical point of view. /Author/

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 101-105
  • Monograph Title: SNOW REMOVAL AND ICE CONTROL RESEARCH
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00193865
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI, STATEDOT
  • Created Date: Jun 13 1979 12:00AM