ERODIBILITY OF CHANNELS WITH COHESIVE BOUNDARY

RESULTS OF LABORATORY INVESTIGATIONS ON THE ERODIBILITY OF COHESIVE SOILS BY WATER WERE CRITICALLY REVIEWED, SUMMARIZED AND COMPARED WITH SIMILAR FIELD RESULTS AND WITH OLDER EMPIRICAL INFORMATION. THERE IS STRONG EXPERIMENTAL EVIDENCE, SUBSTANTIATED BY PHYSICAL REASONING, THAT THE BED SHEAR STRESS STRONGLY CONTROLS BOTH THE EROSION AND THE DEPOSITION OF COHESIVE SEDIMENTS. THE NET ATTRACTIVE PHYSICO-CHEMICAL INTERPARTICLE FORCES IN THE SOIL PROVIDE THE MAIN RESISTANCE TO EROSION. FOR LOW VALUES THE SOIL SHEAR STRENGTH ITSELF DOES NOT HAVE ANY MEASUREABLE EFFECT ON SOIL ERODIBILITY, WHILE FOR MEDIUM TO HIGH STRENGTH CLAYS, THE RESISTANCE TO EROSION SEEMS IN GENERAL TO INCREASE WITH THE MACROSCOPIC STRENGTH. UNDER CERTAIN CONDITIONS EROSION MAY STOP COMPLETELY AFTER SOME SCOURING. THE DEPTH OF THIS SCOURING AND THE FINAL BED ROUGHNESS INCREASE WITH INCREASING SHEAR STRESS AND DECREASING SHEAR STRENGTH OF THE BED. A MECHANISTIC MODEL ABOUT THE INTERACTION BETWEEN THE SURFACE OF THE BED AND THE FLOW IS DESCRIBED WHICH EXPLAINS THE OBSERVED PHENOMENA. A SET OF TENTATIVE RULES IS SUGGESTED FOR DESIGN OF STABLE CHANNELS WITH COHESIVE BOUNDARIES. /ASCE/

• Supplemental Notes:
  • Vol 96, No HY 3, PROC PAPER 7156, PP 755-771, 5 FIG, 28 REF,
• Authors:
  • Partheniades, E
  • Paaswell, R E
• Publication Date: 1970-3

Media Info

• Serial:
  • Journal of the Hydraulics Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Clay; Cohesion; Cohesive soils; Erosion; Mathematical models; Particles; Physicochemical properties; Scour; Sedimentary rocks; Sediments; Shear stress; Soils; Subgrade (Pavements)
• Uncontrolled Terms: Boundaries; Models
• Old TRIS Terms: Beds; Sedimentary deposits
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204277
• Record Type: Publication
• Files: TRIS
• Created Date: May 19 1970 12:00AM