Author(s): Robert T. Milhous

Linked Author(s): Robert T. Milhous

Keywords: No Keywords

Abstract: A low stress gravel bed river is a river where the cross-sectional average dimensionless shear stress (τ_*) rarely exceeds 0.047. That is the case for the Gunnison River below Delta in Western Colorado. The cross-sectional average τ_* in the Gunnison River has not exceeded 0.047, except at one cross section during one year, in the 87 years of record. A τ_* of 0.047 is the critical τ_* in the bed-load equation considered to be most applicable to gravel/cobble bed rivers (the Meyer-Peter, Mueller equation). According to this equation, there has been no bed-material movement in the Gunnison River since 1920; in fact there has been bed-material movement and this movement is biologically important. Bed-material is moved when the τ_* is 0.016 or larger. Streamflows that cause a τ_* of at least 0.016 maintain the aquatic habitat in a low shear stress river.

DOI:

Year: 1997