Identifying key channel variability functions controlling ecohydraulic conditions using synthetic channel archetypes

نویسندگان

چکیده

Geometric modeling of river channel topography is a method design synthesis wherein specific 2D geometric elements topography, such as the bed profile, cross sectional shape, and planform contours, are expressed mathematically in isolation then combined to produce 3D heightmap. We utilized framework synthesize terrains that reveal flow-form-function linkages investigate what roles variability roughness, thalweg elevation width play defining hydraulic ecohydraulic conditions reach from baseflow bankfull discharge. To achieve robust inquiry for range settings, this study developed four distinct synthetic terrain models each 3 stream reaches different types South Fork Eel River northern coastal California, USA. test process-based effects these diverse options, we compared resulting patterns preferred habitat availability fry/juvenile steelhead trout coho salmon over discharges. Among undulation, variation found undulation was key factor affecting response at condition. Furthermore, bankfull, has largest effect high-order mainstem streams identified by gravel-cobble, high width-to-depth ratio, riffle-pool sequences, intermediate confined channels with ratio expansions/contractions, roughness low-order low high-gradient, cobble-boulder step-pool/cascade.

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ژورنال

عنوان ژورنال: Ecohydrology

سال: 2023

ISSN: ['1936-0592', '1936-0584']

DOI: https://doi.org/10.1002/eco.2533