Sediment concentration versus water discharge during single hydrologic events in rivers

Williams, Garnett P.

doi:10.1016/0022-1694(89)90254-0

Cited by 650 publications

(660 citation statements)

References 8 publications

Supporting

Mentioning

599

Contrasting

Unclassified

Order By: Relevance

“…Many studies report hysteretic Q-SSC responses during flood events, explaining why a single Q-SSC relationship is subjected to large scatter (e.g. Williams, 1989;Hudson 2003;Moliere et al 2004;Alexandrov et al 2007). Hysteretic Q-SSC responses were also noted in this study (Fig.5).…”

Section: Suspended Sediment Concentrationssupporting

confidence: 71%

“…Multiple SSC-samples of the flood were taken at the Ilala station (see According to Williams (1989) figure-eight loops can occur when an abundancy of sediment is available, so SSC peaks before Q but with post-peak sediment availability high enough so that SSC decreases relatively slower than Q. For the flood at LT the relatively high SSC values indeed suggest an abundancy of available sediment.…”

Section: Suspended Sediment Concentrationsmentioning

confidence: 99%

See 1 more Smart Citation

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

View full text Add to dashboard Cite

Purpose The Ethiopian highlands are a fragile environment, characterized by steep slopes, intense rainfall, a sparse vegetation cover and the occurrence of flash floods. Although important efforts have been made to mitigate the ongoing soil erosion and land degradation problems, the sediment dynamics at medium-sized catchment scale (100-10,000 km²)are not fully understood. Therefore, this study aims to provide a better of sediment export processes and the importance of flash flood events in semi-arid tropical catchments. 2Methods Measuring campaigns were conducted in 10 subcatchments of the Geba, a tributary of the Tekeze, representative of the northern Ethiopian highlands. During 2 to 4 rainy seasons, the rivers were sampled for their suspended sediment concentration (SSC) and runoff discharge.Results and discussion Variations in SSC and sediment grain-size distribution indicate changes in sediment supply during the rainy season, due to the depletion of readily available sediments and the development of a vegetation cover.Also during flood events, changes in sediment supply are observed. Sediment yields (i.e. 497-6,543 t km -2 yr -1 ) are higher than suggested by previous studies and correlate with rainfall depth. The majority of sediment export occurs during a few short but intense flash floods. No clear effect of implemented soil and water conservation measures could be detected in the sediment yields of the catchments.Conclusions Sediment export rates in the Ethiopian highlands are high, are characterized by important changes in sediment supply and are mainly controlled by the occurrence and magnitude of flash flood events. Mitigation measures to reduce sediment yield at the catchment scale should therefore not only focus on the reduction of hillslope erosion rates, but also on the magnitude of these floods.

show abstract

Section: Suspended Sediment Concentrationssupporting

confidence: 71%

Section: Suspended Sediment Concentrationsmentioning

confidence: 99%

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Duvert et al, 2010;Lloyd et al, 2016;Sun et al, 2015;Tananaev, 2015). The most common patterns are anti-clockwise and clock-wise loops ( Figure 3) (Horowitz et al, 2014;Williams, 1989). More complex hysteresis patterns have also been observed, such as a single line plus a loop and figure-eight patterns (Sun et al, 2015).…”

Section: Hysteresis Modelsmentioning

confidence: 99%

Suspended sediment transport dynamics in rivers: Multi-scale drivers of temporal variation

Vercruysse

Grabowski

Rickson

2017

Earth-Science Reviews

343

181

View full text Add to dashboard Cite

Suspended sediment is a natural part of river systems and plays an essential role in structuring the landscape, creating ecological habitats and transporting nutrients. It is also a common management problem, where alterations to sediment quantity and quality negatively impact ecological communities, increase flood hazard and shorten the lifespan of infrastructure. To address these challenges and develop appropriate sustainable management strategies, we need a thorough understanding of sediment sources, pathways and transport dynamics and the drivers that underlie spatial and temporal variability in suspended sediment transport in rivers. However, research to date has not sufficiently addressed the temporal complexity of sediment transport processes, which is limiting our ability to disentangle the hydro-meteorological, catchment, channel and anthropogenic drivers of suspended sediment transport in rivers. This review critically evaluates previously published work on suspended sediment dynamics to demonstrate how the interpretation of sediment sources and pathways is influenced by the temporal scale and methodology of the study. To do this, the review (i) summarizes the main drivers of temporal variation in suspended sediment transport in rivers; (ii) critically reviews the common empirical approaches used to analyze and quantify sediment sources and loads, and their capacity to account for temporal variations; (iii) applies these findings to recent case studies to illustrate how method and timescale affect the interpretation of suspended sediment transport dynamics; and finally (iv) synthesizes the findings of the review into a set of guidelines for a multi-timescale approach to sediment regime characterization. By recognizing a priori that study design and temporal scale have an impact on the interpretation of SS dynamics and employing methods that address these issues, future research will be better able to identify the drivers of suspended sediment transport in rivers, improve sediment transport modelling, and propose effective, sustainable solutions to sediment management problems.

show abstract

“…The positive correlation between ΔQd and fine suspended sediment concentration suggests that the conditions leading to rapid increases in discharge, namely increased wash load resulting from the erosivity of intense precipitation events, and/or the energy imparted to the channel by rapid increases in discharge are because of a greater water surface slope than on the falling limb (Garcia and Parker, 1991), a larger proportional contribution of base flow/interflow on the falling limb (Gao and Pasternack, 2007), and routing considerations such as higher fine particle sediment supply from areas proximal to the channel and/or lower in the basin (Williams, 1989).…”

Section: U N C O R R E C T E D a C C E P T E Dmentioning

confidence: 99%

“…Negative hysteresis has primarily been associated with routing characteristics, including higher sediment supply from distal portions of the basin and sediment transport lag in larger ( > 10 3 km 2 ) basins, because suspended sediment downstream particle velocities are often lower than peak discharge wave celerity (Heidel, 1956;Williams, 1989). The provenance of storm waters above the lower Salinas was not a significant factor in determining CSSf for low to moderate flows, which indicates that upper basin wash load signals attenuate before reaching the lower Salinas stations.…”

Section: U N C O R R E C T E D a C C E P T E Dmentioning

confidence: 99%

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Gray¹,

Warrick²,

Pasternack³

et al. 2014

Geomorphology

View full text Add to dashboard Cite

show abstract

Sediment concentration versus water discharge during single hydrologic events in rivers

Cited by 650 publications

References 8 publications

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

Suspended sediment transport dynamics in rivers: Multi-scale drivers of temporal variation

Suspended sediment behavior in a coastal dry-summer subtropical catchment: Effects of hydrologic preconditions

Contact Info

Product

Resources

About