Geometry of Gravel Streams

by Howard H. Chang, (M.ASCE), Prof. of Civ. Engrg.; San Diego State Univ., San Diego, Calif.,

Serial Information: Journal of the Hydraulics Division, 1980, Vol. 106, Issue 9, Pg. 1443-1456

Document Type: Journal Paper


A rational method has been developed to predict the regime geometry of straight active gravel streams. The analytical model is based upon a resistance equation, a bed load equation, and the condition of minimum stream power for gravel streams in equilibrium. The analytical channel geometry so obtained is in general agreement with previously established relations and observations. The analytical channel width is proportional to Q0.47, in which Q is the bank full discharge. Except for steep slopes, the width is essentially only a function of the discharge. The analytical depth increases with the discharge but decreases with the slope. On steep slopes, the width increases rapidly with the slope. This rapid increase in width accompanied by a decrease in depth indicates braiding tendency for steep gravel streams. As the bed load approaches zero at the lower boundary, this model for active streams reduces to the threshold theory.

Subject Headings: Bed loads | Slopes | Geometrics | Gravels | Rivers and streams | Hydro power | Bed materials | Load and resistance factor design

Services: Buy this book/Buy this article


Return to search