Sediment Augmentation for River Rehabilitation and Management—A Review

Mörtl, Christian; Cesare, Giovanni De

doi:10.3390/land10121309

Cited by 9 publications

(5 citation statements)

References 103 publications

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“…Investigators have also documented the many beneficial effects of continuing wood fluxes in coastal and marine environments. Consequently, we propose that preserving wood mobility within forested river corridors is analogous to preserving a natural flow regime via environmental flows (Gerten et al, 2013; Tharme, 2003) or a balanced sediment regime via sediment augmentation or bypassing (Kondolf et al, 2014; Mörtl & De Cesare, 2021).…”

Section: Discussionmentioning

confidence: 99%

Why wood should move in rivers

Wohl

Uno

Dunn

et al. 2023

River Research & Apps

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Large wood is inherently mobile in naturally functioning river corridors, yet river management commonly introduces wood that is anchored to limit hazards. Wood that is periodically mobilized is important for: replacing stationary large wood that performs diverse physical and ecological functions; contributing to the disturbance regime of the river corridor; diversifying wood decay states; dispersing organisms and propagules; providing refugia during floodplain inundation and in mobile‐bed channels; dissipating flow energy; and supplying wood to downstream environments including lakes, coastlines, the open ocean, and the deep sea. We briefly review what is known about large wood mobility in river corridors and suggest priorities for ongoing research and river management, including: structural designs that can pass mobile wood; enhancing piece diversity of introduced wood that is anchored in place; quantifying wood mobilization and transport characteristics in natural and managed river corridors; and enhancing documentation of the benefits of wood mobility.

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Section: Discussionmentioning

confidence: 99%

Why wood should move in rivers

Wohl

Uno

Dunn

et al. 2023

River Research & Apps

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“…Knowledge of the sediment regime of a river is prerequisite for ecosystem conservation, channel restoration, and effective management of the fluvial system. To address sediment related issues in streams, sediment augmentation or nourishments are commonly used methods to artificially supply sediment in sediment starved streams (Czapiga et al., 2022; Mörtl & De Cesare, 2021; Viparelli et al., 2011; Wohl et al., 2015). The results of our study provide insight on how the timing of the sediment supply throughout hydrograph will influence bed surface texture, bed topography and sediment transport regimes.…”

Section: Discussionmentioning

confidence: 99%

Influence of Sediment Supply Timing on Bedload Transport and Bed Surface Texture During a Single Experimental Hydrograph in Gravel Bed Rivers

Hassan,

Li,

Viparelli

et al. 2023

Water Resources Research

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Channel stability and sediment transport in gravel bed streams depend on temporally and spatially variable fluid forces, bed surface structures, armoring, and sediment supply/storage. Of particular interest here is the influence of sediment supply timing on bedload transport rate and grain size distribution, bed surface composition and channel morphology. We conducted flume experiments in a sediment feed flume with poorly sorted sediment. A symmetrical, identical stepped hydrograph was used with five different sediment feeding schemes: no feed, constant feed, rising‐limb only feed, falling‐limb only feed, and variable feed. The same sediment mass of 800 kg was fed during each experiment. Sediment transport rates ranged over five orders of magnitude regardless of feeding scheme. Clockwise hysteresis was observed for bedload transport rate and bedload grain size, that is, the transport rate was larger and coarser during the rising limb. Counterclockwise hysteresis was observed for the grain size distribution of the bed surface, that is, the bed surface was finest during the rising limb. In all experiments sediment yield during the rising was higher than during the falling limb, indicating that the rising limb is more capable to transport the supplied sediment. Our study provides insight on how timing of sediment supply influences sediment transport and bed surface during a single hydrograph, essential information for artificial sediment supply projects to restore and habilitate gravel bed streams.

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“…Wohl et al (2015) outlined a more mature approach with their natural sediment regime concept, in which sedimentary processes may be harnessed as tools, and target sediment loads are used to regain target bedforms and channel behavior. Notably underexplored from management toolkits in our region is the concept of sediment redistribution or augmentation, which provides reach to segment scale sediment regime controls (Mörtl & De Cesare, 2021; Welber et al, 2020). Given the complex, ongoing changes we observed even in lower portions of the watershed and the evidence for connectivity among reaches and autogenic controls, we ultimately recommend that restoration strategies, whether local or watershed‐scale, target processes that encourage landform regeneration, rather than attempting to stabilize reaches to a particular state.…”

Section: Recommendations and Conclusionmentioning

confidence: 99%

Historical and contemporary drivers of knickpoint retreat and morphological evolution along Bayou Pierre, Mississippi

Stearman,

Heitmuller

2024

River Research & Apps

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Channel incision in rivers can cause marked ecological and economic damages. This phenomenon is abundant and generally well documented along impacted streams in the loess hills adjacent to the Lower Mississippi River valley. Bayou Pierre, an ecologically important small tributary of the Mississippi River, is currently incising but causes are not well understood. In this study, we examine diverse data sources to: (1) reconstruct a history of erosional stimuli and possible origins and (2) examine effects of contemporary controls. Review of long‐term planform and land use data for the Mississippi River revealed episodic foreshortening events followed by episodic deforestation and reforestation. Hydrologic data suggest an increase in rainfall over the last few decades. Estimates of knickpoint retreat place origins prior to Mississippi River channel straightening (1929–1944). Planform analysis in three focal reaches of Bayou Pierre demonstrates slow change prior to 1982, but accelerated changes after those periods. Mean rainfall and 3‐day storm intensity correlate to some planform changes; however, the storm of 1983 may be a better explanation of sudden planform change. We found some evidence of potential internal feedback loops in patterns of bar growth. Together, our analyses provide a synthesis of stimuli experienced by Bayou Pierre over the last ~200 years and suggest both channel migration events before straightening of the Mississippi River and more recent hydrologic events have influenced patterns of geomorphic change in Bayou Pierre.

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Sediment Augmentation for River Rehabilitation and Management—A Review

Cited by 9 publications

References 103 publications

Why wood should move in rivers

Why wood should move in rivers

Influence of Sediment Supply Timing on Bedload Transport and Bed Surface Texture During a Single Experimental Hydrograph in Gravel Bed Rivers

Historical and contemporary drivers of knickpoint retreat and morphological evolution along Bayou Pierre, Mississippi

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