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A physical scale model of a gravel-bed braided river was used to measurevertical grain size sorting in the morphological active layer aggregated overthe width of the river. This vertical sorting is important for analyzingbraided river sedimentology, for numerical modeling of braided rivermorphodynamics, and for measuring and predicting bedload transport rate. Wedefine the morphological active layer as the bed material between the maximumand minimum bed elevations at a point over extended time periods sufficientfor braiding processes to rework the river bed. The vertical extent of theactive layer was measured using 40 hourly high-resolution DEMs (digital elevation models) of the modelriver bed. An image texture algorithm was used to map bed material grain sizeof each DEM. Analysis of the 40 DEMs and texture maps provides data on thegeometry of the morphological active layer and variation in grain size inthree dimensions. By normalizing active layer thickness and dividing into 10 sublayers, we show that all grain sizes occur with almost equal frequency inall sublayers. Occurrence of patches and strings of coarser (or finer)material relates to preservation of particular morpho-textural featureswithin the active layer. For numerical modeling and bedload prediction, amorphological active layer that is fully mixed with respect to grain size isa reliable approximation

Grain sorting in the morphological active layer of a braided river physical model