Temporal and spatial scales of geomorphic adjustments to reduced competency following flow regulation in bedload-dominated systems

Curtis, Katherine E.; Renshaw, Carl E.; Magilligan, Francis J.; Dade, W. Brian

doi:10.1016/j.geomorph.2009.12.012

Cited by 73 publications

(36 citation statements)

References 32 publications

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“…Previous research has shown that in some rivers a reduction in characteristic water discharge following regulation results in a reduction of bankfull channel width facilitated, in some cases, by bar growth and lateral accretion of the channel banks (Petts and Thoms, 1987;Williams and Wolman, 1984;Schmidt and Wilcock, 2007;Curtis et al, 2010). This observation suggests further analysis comparing changes in sediment flux per channel width or, equivalently, specific flux, to changes in channel properties occurring as the result of dam emplacement.…”

Section: Introductionmentioning

confidence: 89%

“…Also shown in Fig. 5 (open triangles) are data for the regulated West River, Vermont, USA, recently reported by Curtis et al (2010). Details regarding methods of collection and analysis of these data are available in the original study.…”

Section: Response Of Some Rivers To Regulationmentioning

confidence: 99%

“…By analyzing the rate of channel narrowing subsequent to flow regulation, Curtis et al (2010) estimated that about a century will be required for the complete geomorphic adjustment of the West River channel width to reduced flow. Williams and Wolman (1984) estimated that a similar amount of time will be required for the channel bed elevations in rivers below 15 dams in the western U.S. to fully adjust to flow regulation.…”

Section: Response Of Some Rivers To Regulationmentioning

confidence: 99%

“…Previous research has well documented the broad suite of channel changes following impoundment, including post-dam channel narrowing (Friedman et al, 1998;Allred and Schmidt, 1999;Surian, 1999;Grams et al, 2007), reduced channel capacity (Chin et al, 2002), bed incision (Andrews, 1986;Surian and Rinaldi, 2003;Vericat and Batalla, 2005;Grams et al, 2007;Surian and Cisotto, 2007), sinuosity adjustments (Magilligan et al, 2008), and bar growth, especially at tributary junctions (Petts and Thoms, 1987;Curtis et al, 2010). Despite the voluminous case studies documenting the range of channel adjustments to flow regulation, predicting the specific direction and magnitude of geomorphic adjustments remains unresolved (Maddock, 1970).…”

Section: Introductionmentioning

confidence: 99%

“…We then incorporate the data compiled by Schmidt and Wilcock (2007) in the context of our analysis and apply our analysis in an interpretation of recently reported observations of changes in regulated bedload channels in the eastern U.S. (Skalak et al, 2009;Curtis et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Sediment transport constraints on river response to regulation

Dade

Renshaw

2011

Geomorphology

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Section: Introductionmentioning

confidence: 89%

Section: Response Of Some Rivers To Regulationmentioning

confidence: 99%

Section: Response Of Some Rivers To Regulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sediment transport constraints on river response to regulation

Dade

Renshaw

2011

Geomorphology

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The equilibrium alluvial river under variable flow and its channel‐forming discharge

et al. 2017

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When the water discharge, sediment supply, and base level vary around stable values, an alluvial river evolves toward a mean equilibrium or graded state with small fluctuations around this mean state (i.e., a dynamic or statistical equilibrium state). Here we present analytical relations describing the mean equilibrium geometry of an alluvial river under variable flow by linking channel slope, width, and bed surface texture. The solution holds in river normal flow zones (or outside both the hydrograph boundary layer and the backwater zone) and accounts for grain size selective transport and particle abrasion. We consider the variable flow rate as a series of continuously changing yet steady water discharges (here termed an alternating steady discharge). The analysis also provides a solution to the channel‐forming water discharge, which is here defined as the steady water discharge that, given the mean sediment supply, provides the same equilibrium channel slope as the natural long‐term hydrograph. The channel‐forming water discharge for the gravel load is larger than the one associated with the sand load. The analysis illustrates how the load is distributed over the range of water discharge in the river normal flow zone, which we term the “normal flow load distribution”. The fact that the distribution of the (imposed) sediment supply spatially adapts to this normal flow load distribution is the origin of the hydrograph boundary layer. The results quantify the findings by Wolman and Miller (1960) regarding the relevance of both magnitude and frequency of the flow rate with respect to channel geometry.

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Downstream Channel Gradation in the Regulated Peace River

Ayles

Church

2014

The Regulation of Peace River

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Temporal and spatial scales of geomorphic adjustments to reduced competency following flow regulation in bedload-dominated systems

Cited by 73 publications

References 32 publications

Sediment transport constraints on river response to regulation

Sediment transport constraints on river response to regulation

The equilibrium alluvial river under variable flow and its channel‐forming discharge

Downstream Channel Gradation in the Regulated Peace River

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