Water Erosion of Florida Rock Materials

The objective of this project was to construct two devices to measure the erosion rate of soft rock, cohesive and non-cohesive materials. The first device, termed the RETA (Rotating Erosion Test Apparatus), circulates water around a cylindrical sample and the shear stress applied to it is correlated to erosion rate. Five of these devices have been constructed of which four are currently operational at the Florida Department of Transportation's State Materials Office. The second device developed in this project is a recirculating flume (SERF - Sediment Erosion Recirculating Flume) that can test a wide variety of materials. An electronic sensor array accurately measures the elevation of the test sample that is located flush with the flume's lower surface. As water flow over the sample, erosion of the surface is detected by the sensors and initiates minute movement upwards of the specimen until it is again flush with the surface. This operation is controlled by LABVIEW software which signals the stepping motor to raise the sample discrete distances. The total amount of steps is converted into a vertical distance and compared to the imposed shear stress on the sample, thereby, obtaining an erosion rate. Data obtained from both units show good results and it is expected that they will provide valuable information to bridge designers with regards to scour susceptibility.


  • English

Media Info

  • Media Type: Print
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; Tables;
  • Pagination: 66p

Subject/Index Terms

Filing Info

  • Accession Number: 01014868
  • Record Type: Publication
  • Report/Paper Numbers: UF 4910 45-11-371
  • Contract Numbers: BC354 RPWO #12
  • Created Date: Dec 19 2005 10:51AM