A graphical method to study suspended sediment dynamics during flood events in the Wadi Sebdou, NW Algeria (1973–2004)

Megnounif, Abdesselam; Terfous, Abdelali; Ouillon, Sylvain

doi:10.1016/j.jhydrol.2013.05.029

Cited by 50 publications

(39 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With increasing memory effects, coincident values of C and Q become less dependent on each other and the rating curves less suitable to model their relation. The study of sediment dynamics in the Wadi Abd in the future will thus likely require a more appropriate method than rating curves, such as the study of each individual flood, like Megnounif et al (2013) did in the Wadi Sebdou. This finding may have consequences on water management as well.…”

Section: Validity Range Of Rating Curvesmentioning

confidence: 99%

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Achite

Ouillon

2016

Hydrol. Earth Syst. Sci.

Self Cite

View full text Add to dashboard Cite

Abstract.Here we investigate the changes of temperature, precipitation, river runoff and sediment transport in the Wadi Abd in northwest Algeria over a time series of 40 hydrological years . Temperature increased and precipitation decreased with the reduction in rainfall being relatively higher during the rainy season. A shift towards an earlier onset of first rains during summer was also found with cascading effects on hydrology (hydrological regimes, vegetation, etc.) and thus on erosion and sediment yield. During the 1980s, the flow regime shifted from perennial to intermittent with an amplification of the variations of discharge and a modification of the sediment regime with higher and more irregular suspended particulate flux. Sediment flux was shown to almost double every decade from the 1970s to the 2000s. The sediment regime shifted from two equivalent seasons of sediment yield (spring and fall) to a single major season regime. In the 2000s, autumn produced over 4 times more sediment than spring. The enhanced scatter of the C-Q pairs denotes an increase of hysteresis phenomena in the Wadi Abd that is probably related to the change in the hydrologic regime. At the end of the period, due to irregularity of the discharge, the ability of a rating curve to derive suspended sediment concentration from river discharge was poor.

show abstract

Section: Validity Range Of Rating Curvesmentioning

confidence: 99%

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Achite

Ouillon

2016

Hydrol. Earth Syst. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The specific features of each individual event loop are believed to be a direct reflection of the catchment and hydrologic processes and their relative importance [ Seeger et al ., ; Mukundan et al ., ]. However, with turbidity, as well as other water quality parameters, we have yet to decipher the full extent of the information contained within the shape of hysteresis loops [e.g., Rose , ; Megnounif et al ., ; Siwek et al ., ].…”

Section: Introductionmentioning

confidence: 98%

Quantitative characterization of stream turbidity‐discharge behavior using event loop shape modeling and power law parameter decorrelation

Mather

Johnson

2014

Water Resources Research

View full text Add to dashboard Cite

Turbidity behavior in streams is a complex and dynamic function of both source material supply and event-driven transport. While the primary controls on turbidity behavior across time and space are still not fully understood, recent increases in the availability of high temporal resolution, colocated stream turbidity, and discharge data provide an opportunity for more detailed analysis. Here we examine methods to quantitatively characterize event responses by modeling the shape of turbidity-discharge hysteresis loops. A total of 1559 events from 20 gages in the Mid-Atlantic region of the U.S. were modeled using both previously reported models and new models combining elements of existing models. The results suggest that a more general power law-based model, utilizing both a discharge rate of change term and a ''supply'' term, allows characterization of a wide range of simple and complex events. Additionally, this study explores a decorrelation approach to address the strong correlation frequently observed between the power law model coefficient (a) and exponent (b), with the goal of exposing the underlying behavior of each parameter individually. An examination of seasonal parameter behavior suggests that this approach may facilitate greater physically based interpretation of the power law coefficient. The power law parameter decorrelation strategy and the loop models examined here provide a step toward the larger goal of understanding the physical controls on turbidity-discharge hysteretic behavior.

show abstract

“…This alone would lead to a 40% drop in per capita water availability in the region by 2050 [3]. In Maghreb (Northwest Africa), which has only scarce water resources, most damage is associated with the loss of alluvial sediments from the catchment and subsequent dam siltation [4]. The study of semi-arid North African environments is problematic for several reasons.…”

Section: Introductionmentioning

confidence: 99%

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Zettam

Taleb

Sauvage

et al. 2017

Water

View full text Add to dashboard Cite

Sediment deposits in North African catchments contribute to around 2%-5% of the yearly loss in the water storage capacity of dams. Despite its semi-arid climate, the Tafna River plays an important role in Algeria's water self-sufficiency. There is continuous pressure on the Tafna's dams to respond to the demand for water. The Soil and Water Assessment Tool (SWAT) was used to evaluate the contribution of different compartments in the basin to surface water and the dams' impact on water and sediment storage and its flux to the sea in order to develop reservoir management. The hydrological modelling fitted well with the observed data (Nash varying between 0.42 and 0.75 and R 2 varying between 0.25 and 0.84). A large proportion of the surface water came from surface runoff (59%) and lateral flow (40%), while the contribution of groundwater was insignificant (1%). SWAT was used to predict sediments in all the gauging stations. Tafna River carries an average annual quantity of 2942 t·yr −1 to the Mediterranean Sea. A large amount of water was stored in reservoirs (49%), which affected the irrigated agricultural zone downstream of the basin. As the dams contain a large amount of sediment, in excess of 27,000 t·yr −1 (90% of the sediment transported by Tafna), storage of sediment reduces the lifetime of reservoirs.

show abstract

A graphical method to study suspended sediment dynamics during flood events in the Wadi Sebdou, NW Algeria (1973–2004)

Cited by 50 publications

References 28 publications

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Recent changes in climate, hydrology and sediment load in the Wadi Abd, Algeria (1970–2010)

Quantitative characterization of stream turbidity‐discharge behavior using event loop shape modeling and power law parameter decorrelation

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Contact Info

Product

Resources

About