ABSTRACT
Channel morphometry is concerned with the definition, measurement and analysis of quantitative indices describing the cross section, the bedform and long profile, and the plan geometry of rivers. Traditionally, however, pseudo-random sampling based largely on convenience of access has favoured identification of channel variations as continuous functions of discharge or contributing basin area. The purpose behind channel morphometry is often to relate form characteristics to hydrological or process variables so that these can in turn be inferred from more easily measured and relatively static morphometric properties. Measures of cross-section asymmetry are based on the displacement of either area or maximum depth relative to the channel centre-line, and range from a simple ratio of left- and right-hand sub-areas to more complex measures tested by A. D. Knighton. The frequency of exceeding bench elevations is critical, since some are sub-bankfull benches within the contemporary channel, whereas others reflect adjustment of channel geometry to altered hydrological regime.
