![]() To test the process‐based effects of these diverse terrain synthesis options, we compared the resulting hydraulic patterns and preferred habitat availability for fry/juvenile steelhead trout and coho salmon over a range of discharges. To achieve a robust inquiry for a range of settings, this study developed four distinct synthetic channel terrain models for each of 3 stream reaches of different channel types in the South Fork Eel River in northern coastal California, USA. We utilized the geometric modeling framework to synthesize channel terrains that reveal flow‐form‐function linkages to investigate what roles variability in bed roughness, thalweg elevation and channel width play in defining hydraulic and ecohydraulic conditions of a channel reach from baseflow to bankfull discharge. ![]() ![]() Geometric modeling of river channel topography is a method of design synthesis wherein specific 2D geometric elements of river topography, such as the bed profile, cross sectional shape, and channel planform contours, are expressed mathematically in isolation and then combined to produce a 3D heightmap.
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