EXPERIMENTAL STUDY ON THE RESPONSE OF A RIVER CHANNEL BASED ON A STABLE RIVER CHANNEL GEOMETRY

Abstract

 In this study, an experimental investigation was conducted to determine the future response of the river channel. The condition of a stable channel occurrence was used as a criterion. The followings were obtained from the experimental data. (1) As a river channel moves toward a state of dynamic equilibrium, it approaches a stable channel. (2) In near-natural channel conditions, the cross-sectional geometry has an average K-value. (3) The cross-sectional geometry has a K-value near the boundary of the stable channel condition when river width or bed level is restricted by revetments or bed breaching. (4) The cross-sectional geometry tends to widen and lower the riverbed when the K-value is greater and less than the stable channel condition. (5) An extensive flow discharge history determines the cross-sectional geometry of a river channel. The cross-sectional shape can be predicted using appropriate channel-forming flow discharge.