Two pool-to-pool spacing periods on large sand-bed rivers: Mega-pools on the Madeira and Mississippi

Gibson, Stanford; Osorio, Aleli; Creech, Calvin; Amorim, Renato; Dircksen, M.; Dahl, Travis; Koohafkan, Michael

doi:10.1016/j.geomorph.2018.12.021

Cited by 7 publications

(12 citation statements)

References 50 publications

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“…One of these observations is the spacing between pools or riffles being roughly 5-7 times the channel width (denoted as the W s ratio, Figure 2B). Furthermore, since the meander wavelengths usually consist of two riffle-pool sequences, the meander wavelengths should be 10-14 times the channel width [27,28,53,[61][62][63][64][65].…”

Section: Previous Studies On Riffle-pool Sequencementioning

confidence: 99%

“…Numerous prior studies summarized different aspects of human modifications of the LMR, such as sedimentation deficit [5][6][7][8]38,70] or geomorphological or hydrodynamic responses to human impact [50,[70][71][72][73]. Only few studies [19,22,65,69] aimed to investigate the temporal and spatial variations of the thalweg profiles and riffle-pool sequences. Among these studies, Hudson [22] was the first to discuss pool-riffle morphology in the LMR.…”

Section: Relevant Studies In the Lmrmentioning

confidence: 99%

“…Furthermore, similar to Hudson [22], this study also did not overlap with our study area. Note that, although Gibson et al [65] also studied riffle-pool sequences in the LMR, their study solely used 2013 hydrographic survey to identify pools in the LMR. In sum, our study is a pioneering and unique attempt to document all the hydrographic surveys from the late 1940s to early 2013s.…”

Section: Relevant Studies In the Lmrmentioning

confidence: 99%

“…Carling and Orr [80] reviewed over 50 studies and concluded that there are only four robust, objective analytical techniques to identify riffle-pool sequence ( Table 2), and most of the studies adopted one of these principal techniques. Among all the identification techniques, the "bed-form differencing technique" developed by O'Neill and Abrahams [81] is the most common method that was employed by several studies [19,22,64,65,82]. This method, therefore, was employed in our study.…”

Section: Riffle-pool Identification and Analysismentioning

confidence: 99%

“…In addition, using 250-400-m gaps between two intermediate cross-sections might sometimes result in not capturing pools or riffles. However, several studies [19,22,65,83] employed these hydrographic transects, and suggested that these data provide sufficient resolution for the identification of riffles and pools.…”

Section: Riffle-pool Identification and Analysismentioning

confidence: 99%

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Decadal-Scale Variations of Thalweg Morphology and Riffle–Pool Sequences in Response to Flow Regulation in the Lowermost Mississippi River

Mossa

2019

Water

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The lowermost Mississippi River (LMR) is one of the largest deltaic systems in North America and one of the heavily human-manipulated fluvial river systems. Historic hydrographic surveys from the mid-1900s to the early 2010s were used to document the thalweg morphology adjustments, as well as the riffle-pool sequences. Extensive aggradation was observed during 1950s to 1960s, as the Atchafalaya River was enlarging before the completion of the Old River Control Structure (ORCS). Following the completion of the ORCS, reductions in sediment input to the LMR resulted in net degradation of the thalweg profile patterns since the mid-1960s except for the 1992-2004 period. Different flood events that supplied sediment might be the cause of upstream aggradation from 1963-1975 and net aggradation along the entire reach from 1992-2004. Furthermore, the change pattern of thalweg profiles appear to be controlled by backwater effects, as well as the Bonnet Carré spillway opening. Results from riffle-pool sequences reveal that the averaging W s ratios (length to channel width) are 6-7, similar to numerous previous studies. Temporal variations of the same riffles and pools reveal that aggradation and degradation might be heavily controlled by similar factors to the thalweg variations (i.e., sediment supply, backwater effects). In sum, this study examines decadal-scale geomorphic responses in a low-lying large river system subject to different human interventions, as well as natural flood events. Future management strategies of this and similar river systems should consider recent riverbed changes in dredging, sediment management, and river engineering.

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Section: Previous Studies On Riffle-pool Sequencementioning

confidence: 99%

Section: Relevant Studies In the Lmrmentioning

confidence: 99%

Section: Relevant Studies In the Lmrmentioning

confidence: 99%

Section: Riffle-pool Identification and Analysismentioning

confidence: 99%

Section: Riffle-pool Identification and Analysismentioning

confidence: 99%

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Decadal-Scale Variations of Thalweg Morphology and Riffle–Pool Sequences in Response to Flow Regulation in the Lowermost Mississippi River

Mossa

2019

Water

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Detecting multi‐scale riverine topographic variability and its influence on Chinook salmon habitat selection

Duffin

Carmichael

Yager

et al. 2021

Earth Surf Processes Landf

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Quantifying geomorphic conditions that impact riverine ecosystems is critical in river management due to degraded riverine habitat, changing flow and thermal conditions, and increasing anthropogenic pressure. Geomorphic complexity at different scales directly impacts habitat heterogeneity and affects aquatic biodiversity resilience. Here we showed that the combination of continuous spatial survey at high resolution, topobathymetric light detection and ranging (LiDAR), and continuous wavelet analysis can help identify and characterize that complexity. We used a continuous wavelet analysis on 1-m resolution topobathymetry in three rivers in the Salmon River Basin, Idaho (USA), to identify different scales of topographic variability and the potential effects of this variability on salmonid redd site selection.On each river, wavelet scales characterized the topographic variability by portraying repeating patterns in the longitudinal profile. We found three major representative spatial wavelet scales of topographic variability in each river: a small wavelet scale associated with local morphology such as pools and riffles, a mid-wavelet scale that identified larger channel unit features, and a large wavelet scale related to valley-scale controls. The small wavelet scale was used to identify pools and riffles along the entire lengths of each river as well as areas with differing riffle-pool development. Areas along the rivers with high local topographic variability (high wavelet power) at all wavelet scales contained the largest features (i.e., deepest or longest pools) in the systems. By comparing the wavelet power for each wavelet scale to Chinook salmon redd locations, we found that higher small-scale wavelet power, which is related to pool-riffle topography, is important for redd site selection. The continuous wavelet methodology objectively identified scales of topographic variability present in these rivers, performed efficient channel-unit identification, and provided geomorphic assessment without laborious field surveys.

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Nature‐based solutions for improving navigation reliability on the Madeira River, Brazil

Suedel

Amorim²,

Lauth

et al. 2021

Integr Envir Assess & Manag

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This article is part of the special series "Incorporating Nature-based Solutions to the Built Environment." The series documents the way in which the United Nations Sustainable Development Goal (SDG) targets can be addressed when nature-based solutions (NBS) are incorporated into the built environment. This series presents cutting-edge environmental research and policy solutions that promote sustainability from the perspective of how the science community contributes to SDG implementation through new technologies, assessment and monitoring methods, management best practices, and scientific research.

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Two pool-to-pool spacing periods on large sand-bed rivers: Mega-pools on the Madeira and Mississippi

Cited by 7 publications

References 50 publications

Decadal-Scale Variations of Thalweg Morphology and Riffle–Pool Sequences in Response to Flow Regulation in the Lowermost Mississippi River

Decadal-Scale Variations of Thalweg Morphology and Riffle–Pool Sequences in Response to Flow Regulation in the Lowermost Mississippi River

Detecting multi‐scale riverine topographic variability and its influence on Chinook salmon habitat selection

Nature‐based solutions for improving navigation reliability on the Madeira River, Brazil

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