Riffle and pool sequences
WebMay 1, 1993 · Riffle-pool sequences are the characteristic reach-scale bedforms of mixed- and gravel-bedded rivers. While most research has been directed to the quantitative description of these sequences and to their maintenance, comparatively little attention has been given to the processes responsible for their formation. WebOct 1, 1993 · Riffle-pools are the characteristic reach-scale bedforms of gravel- and mixed-bedded channels of low to moderate slope. The purpose of this paper is to clarify several aspects of the sedimentology of riffle-pool sequences, and to suggest how these both reflect and control riffle-pool stability in the presence of spatial differences in the …
Riffle and pool sequences
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WebJul 3, 2015 · Riffles and pools formed in wide and narrow areas, respectively, and the location of and relief between riffles and pools remained the same throughout all experimental runs, regardless of the sediment supply. The primary channel response to changes in supply was adjustment of the overall slope. WebThe pseudo-cyclic oscillation of the bed in a riffle-pool stream suggests the application of a variety of techniques of spatial series analysis, which provide objective measures of riffle …
WebAug 4, 2015 · Mixing effects on nitrogen and oxygen concentrations and the relationship to mean residence time in a hyporheic zone of a riffle-pool sequence August 4, 2015 Flow paths and residence times in the hyporheic zone are known to influence biogeochemical processes such as nitrification and denitrification. WebPool-Riffle Sequence. Several PRS maintenance models focus on patterns of sediment mobilization that are size selective, temporally sporadic and patchy in nature (Clifford, …
WebApr 12, 2000 · N2 - Despite the occurrence of pool-riffle sequences in many rivers there are few data concerning pool-riffle unit morphology. Of many criteria proposed to identify pool-riffle units, only two methods can be regarded as objective and robust. These are the â zero-crossingâ and the â control-pointâ methods. WebThe reintroduction of riffle‐pool sequences has increasingly been promoted as an appropriate rehabilitation alternative for the re‐naturalization of modified gravel‐bed channels. However, in the absence of hydraulic design guidelines, enhancement efforts often fail to evaluate the subsequent impacts to flood levels and sediment transport …
WebOct 1, 1993 · Riffle-pools are the characteristic reach-scale bedforms of gravel- and mixed-bedded channels of low to moderate slope. The purpose of this paper is to clarify several aspects of the sedimentology of riffle-pool sequences, and to suggest how these both reflect and control riffle-pool stability in the presence of spatial differences in the …
WebAug 13, 2024 · Pool–riffle sequences are common bed forms in mountain rivers that have a significant effect on hydraulic and hydro-environment characteristics. Relatively few studies exist on the comparison of two and three dimensional modeling for … connect function reduxWebMay 10, 2024 · Simulations show that erosion of the upper A.R. can account for 73% of the water discharge increase. Dredging in the lower A.R. between 1932 and 1950 can account for 35% of the water discharge increase, and was also an … connect ft with macbookWebMay 1, 1993 · A riffle—pool sequence is thus created autogenetically as the summation of a sequence of irregularities, each unit of which is formed and maintained only by flow dynamics operating at the local scale. The process is essentially both deterministic and statistical in character. connect gaijin account to steamWebPools and riffles are present in nearly all perennial channels where the size of the bed material is greater than coarse sand, and they are relatively stable in their position along … connect funny pipe to pvcWebThe water's surface over a riffle at low flow also has a much steeper slope than that over other in-channel landforms. Channel sections with a mean water surface slope of roughly 0.1 to 0.5% exhibit riffles, though they can … connect fujitsu scanner to computerWeb1. the riffle-to-pool transition detail is a schematic (generalized) drawing of: a. the relationship between the stream channel horizontal alignment (meander geometry) and … edhrec abomination of llanowarWebApr 11, 2024 · Short-term population recovery was assessed using mark-recapture sampling in a riffle-shallow pool-riffle sequence. Crayfish were marked with Visible Implant Elastomer tags the morning of the rainstorm and recapture attempts occurred 2, 8, 10, and 16 days post-flood. The crayfish population in riffles returned to pre-flood densities within 10 ... connect furnace to generator