Flood magnitude–frequency and lithologic control on bedrock river incision in post-orogenic terrain
نویسندگان
چکیده
منابع مشابه
Sediment and rock strength controls on river incision into bedrock
Recent theoretical investigations suggest that the rate of river incision into bedrock depends nonlinearly on sediment supply, challenging the common assumption that incision rate is simply proportional to stream power. Our measurements from laboratory abrasion mills support the hypothesis that sediment promotes erosion at low supply rates by providing tools for abrasion, but inhibits erosion a...
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[1] Recent theoretical models suggest that topographic characteristics of bedrock channels are products of interactions among tectonics, substrate resistance, and the climatically modulated erosive ability of the river. The degree to which these factors influence the form of channel profiles is poorly quantified at present. Here we investigate bedrock channels developed across the southern flan...
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[1] Observations of likely fluvial channels on the surface of Titan, along with Titan’s geologically youthful surface, motivate this study of comparative fluvial erosion rates on Titan and the Earth. The roles of bedload abrasion, suspended load abrasion, plucking, and cavitation are considered. Despite orders of magnitude differences in some of the physical parameters that control fluvial inci...
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Recognition that channel form reflects a river's ability to erode rock has spawned stream-power models that estimate patterns of incision by approximating energy dissipation within a channel. Most commonly, these models assume channel width exponentially scales with drainage area, in part, because drainage area is easily extracted from digital elevation models (DEMs). However, this assumption i...
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[1] Abrasion by bed load is a ubiquitous and sometimes dominant erosional mechanism for fluvial incision into bedrock. Here we develop a model for bedrock abrasion by saltating bed load wherein the wear rate depends linearly on the flux of impact kinetic energy normal to the bed and on the fraction of the bed that is not armored by transient deposits of alluvium. We assume that the extent of al...
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ژورنال
عنوان ژورنال: Geomorphology
سال: 2006
ISSN: 0169-555X
DOI: 10.1016/j.geomorph.2005.08.018