Scale?Dependent Contributors to River Profile Geometry
نویسندگان
چکیده
A range of complex hydraulic and geomorphic processes shape terrestrial landscapes. It remains unclear how these act to generate observed drainage networks across scales interest. To address this issue, we transform synthetic longitudinal river profiles into the spectral domain with a view interrogating different at which fluvial landscapes are generated. North American characterized by red noise (i.e., power, ? ? k?2, where k is wave number) wavelengths >100 km pink (? k?1) shorter wavelengths. This observation suggests that profile geometries scale-dependent using small-scale observations develop general understanding large-scale landscape evolution not straightforward. At km, appear be controlled smoothly varying patterns regional uplift slope-dependent incision. Landscape simulations, based upon stream power externally forced do exhibit transition from because simulations incorporate heterogeneous erodibility. Spectral analysis erodibility extracted lithologic variation along missing accounted for substrates, white or blue k0 k1). Our results have implications way rivers record tectonic forcing while incising through patterns.
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Earth Surface
سال: 2021
ISSN: ['2169-9011', '2169-9003']
DOI: https://doi.org/10.1029/2020jf005879