Engineered channel controls limiting spawning habitat rehabilitation success on regulated gravel-bed rivers
نویسندگان
چکیده
منابع مشابه
Sediment supply controls equilibrium channel geometry in gravel rivers.
In many gravel-bedded rivers, floods that fill the channel banks create just enough shear stress to move the median-sized gravel particles on the bed surface (D50). Because this observation is common and is supported by theory, the coincidence of bankfull flow and the incipient motion of D50 has become a commonly used assumption. However, not all natural gravel channels actually conform to this...
متن کاملEquivalent roughness of gravel-bed rivers
The relation between the equivalent roughness and different grain size percentiles of the sediment in gravel-bed rivers was determined under the hypothesis that the vertical distribution of the flow velocity follows a logarithmic law. A set of 954 data points was selected from rivers with gravel size sediment or larger, with a non-sinuous alignment and free of vegetation or obstacles. According...
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Animals make decisions based on the sensory information that they obtain from the environment and other organisms within that environment. This information is transported, transmitted, masked and filtered by fluvial factors and processes, such as relative roughness and turbulent flow. By interpreting the resultant signals, animals decide on the suitability of habitat and their reaction to other...
متن کاملUse of slope creation for rehabilitating incised , 3 regulated , gravel bed rivers 4
6 [1] Gravel-bedded channels often become incised and degraded below dams. Gravel can 7 be added to the channel to rehabilitate hydrogeomorphic conditions, including those 8 promoting salmon spawning. When implemented without increasing bed slope, gravel 9 addition at downstream riffles back floods upstream riffles. A 2-year gravel augmentation 10 project was done to test the efficacy of a new ...
متن کاملBankfull Discharge Recurrence Interval in Gravel-bed Rivers
Bankfull discharge was identified in some 30 gravel-bed rivers representing in total c. 40 gauging stations. The catchment sizes vary from 4km2 to nearly 2700km2. Bankfull discharge value increases with basin size. In the case of gravel-bed rivers developed on an impermeable substratum, the following equation emerges: Qb=0·087 A 1·044. Bankfull discharge recurrence interval was determined by fi...
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ژورنال
عنوان ژورنال: Geomorphology
سال: 2008
ISSN: 0169-555X
DOI: 10.1016/j.geomorph.2007.09.012