EXPERIMENTAL STUDY ON BEDROCK INCISION AND BED CONFIGURATION IN ANNULAR FLUME FLOW
نویسندگان
چکیده
منابع مشابه
Flume Studies of the Effect of Perpendicular Log Obstructions on Flow Patterns and Bed Topography
It is known that woody debris in stream channels modifies morphology in many ways, ranging from scour of the bed to lateral migration of the channel over time. Since the occurrence of woody debris in streams results in a complex set of inter-related processes, it is useful to use controlled conditio ns in laborato ry experim ents to aid in the understan ding of thes e processe s. A flume study ...
متن کاملA model for fluvial bedrock incision by impacting suspended and bed load sediment
[1] A mechanistic model is derived for the rate of fluvial erosion into bedrock by abrasion from uniform size particles that impact the bed during transport in both bed and suspended load. The erosion rate is equated to the product of the impact rate, the mass loss per particle impact, and a bed coverage term. Unlike previous models that consider only bed load, the impact rate is not assumed to...
متن کاملSediment 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...
متن کاملA mechanistic model for river incision into bedrock by saltating bed load
[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...
متن کاملRelative rates of fluvial bedrock incision on Titan and Earth
[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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
سال: 2017
ISSN: 2185-467X
DOI: 10.2208/jscejhe.73.i_847