Efficacité des aménagements de lutte contre le ravinement: cas du bassin versant d’El Hnach (Tunisie)

Rebai, H.; Raclot, Damien; Ouezdou, H. Ben

doi:10.1080/02626667.2013.824087

Cited by 4 publications

(3 citation statements)

References 23 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…when their application favours wealthy farmers at the expense of others) (Poesen and Valentin, 2003;Rey, 2004;Frankl et al, 2016;Sheshnev, 2017;Smit et al, 2017). Furthermore, techniques that work in a certain area may fail in another if environmental settings, particularly pedoclimatic conditions, differ strongly (Rebai et al, 2013;Zimale et al, 2017). Also, when rural communities and their (indigenous) knowledge are weakly integrated in restoration initiatives, this may be a cause for failure (Pawluk et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Gully prevention and control: Techniques, failures and effectiveness

Frankl

Nyssen

Vanmaercke

et al. 2021

Earth Surf Processes Landf

View full text Add to dashboard Cite

Gully erosion is a major environmental problem, posing significant threats to sustainable development. However, insights on techniques to prevent and control gullying are scattered and incomplete, especially regarding failure rates and effectiveness. This review aims to address these issues and contribute to more successful gully prevention and control strategies by synthesizing the data from earlier studies. Preventing gully formation can be done through land use change, applying soil and water conservation techniques or by targeted measures in concentrated flow zones. The latter include measures that increase topsoil resistance and vegetation barriers. Vegetation barriers made of plant residues have the advantage of being immediately effective in protecting against erosion, but have a short life expectancy as compared to barriers made of living vegetation. Once deeply incised, the development of gullies may be controlled by diverting runoff away from the channel, but this comes at the risk of relocating the problem. Additional measures such as headcut filling, channel reshaping and headcut armouring can also be applied. To control gully channels, multiple studies report on the use of check dams and/or vegetation. Reasons for failures of these techniques depend on runoff and sediment characteristics and cross‐sectional stability and micro‐environment of the gully. In turn, these are controlled by external forcing factors that can be grouped into (i) geomorphology and topography, (ii) climate and (iii) the bio‐physical environment. The impact of gully prevention and control techniques is addressed, especially regarding their effect on headcut retreat and network development, the trapping of sediment by check dams and reduction of catchment sediment yield. Overall, vegetation establishment in gully channels and catchments plays a key role in gully prevention and control. Once stabilized, gullies may turn into rehabilitated sites of lush vegetation or cropland, making the return on investment to prevent and control gullies high. © 2020 John Wiley & Sons, Ltd.

show abstract

Section: Introductionmentioning

confidence: 99%

Gully prevention and control: Techniques, failures and effectiveness

Frankl

Nyssen

Vanmaercke

et al. 2021

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…Over recent decades, gully erosion has caused significant impact, and considerable efforts have been undertaken to remediate and reduce the amount of sediment coming from gullies on local and regional scales. Examples include Australia (Rust and Star, 2018;Wilkinson et al, 2018), Belgium (Poesen and Govers, 1990), China (Chen and Cai, 2006;Rustomji et al, 2008), Ecuador (Molina et al, 2009), Ethiopia (Nyssen et al, 2004;Haregeweyn et al, 2012;Frankl et al, 2016;Guyassa et al, 2017Guyassa et al, , 2018, India (Pani, 2016;Dagar and Singh, 2018;Shit et al, 2020b), South America (Borja et al, 2018), Spain (Castillo et al, 2007), Tunisia (Rebai et al, 2013) and the United States (Dabney et al, 2012;Nichols et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A review of the magnitude and response times for sediment yield reductions following the rehabilitation of gullied landscapes

Bartley

Poesen

Wilkinson

et al. 2020

Earth Surf Processes Landf

View full text Add to dashboard Cite

Gully erosion is a major driver of elevated sediment yields across many areas of the globe, and considerable rehabilitation has occurred to reduce the amount of sediment eroded from gullies. However, compared to other forms of erosion, there has been little systematic review of the effectiveness of gully rehabilitation on reducing sediment yields. This study reviewed the global literature to provide an understanding of the potential sediment yield reductions that can occur following the rehabilitation of gullied landscapes. We focused on studies reporting a measured response on how gully and catchment sediment yield has changed since treatment. A total of 37 studies were found that met this criterion. The studies were partitioned into three broad categories, including those focused on: (i) treating the catchment above the gully; (ii) installing treatments in the actual gully channel; and (iii) a combination of approaches which include treating both the catchment and the gully channel. All the studies demonstrated a reduction in sediment yield following gully rehabilitation, with reported values ranging between 12 and 94%. The timeframes associated with the reductions in sediment yield varied considerably (2-80years). Applying a variety of rehabilitation measures, which generally includes treating both the hillslope above the gully, and trapping sediment within the gully, appears to result in shorter (median) timescales for sediment yield reduction. Overall, this review indicates that gully rehabilitation strategies combining both engineering and vegetation measures are often the most successful. Engineering measures such as check dams are important for stabilizing sites in the early phases to support the revegetation of gullies and adjacent hillslopes. However, vegetation is the key to the long-term success of gully rehabilitation. This is because many engineering structures eventually fail, or they have a limited life span as an active sediment trap.

show abstract

“…In the Sahel and elsewhere, several studies have implicated similar factors in the deterioration of anti‐erosion structures. The works of Rebai et al (2013) carried out in the El Hnach watershed in Tunisia reveal that lithology, slope, and respect for the toposequence are the main factors controlling the effectiveness of anti‐erosion structures. Maïga‐Yaleu et al (2015) observe that in semiarid environments, an increase in slope considerably influences the speed of rainwater flow and the mobilization of soil particles, which weakens the resistance of anti‐erosion measures.…”

Section: Discussionmentioning

confidence: 99%

Effects of restoration of degraded lands on soils physicochemical properties and adaptability of planted woody species in southwestern Niger

2022

View full text Add to dashboard Cite

This study examines the effects of restoration of degraded lands on soils physicochemical properties and adaptability of planted woody species over a period of 4-6 years. It is based on: (1) Physicochemical analyses of soils (granulometry, calcimetry, and organic matter); (2) measures carried out for the dimensioning of anti-erosion structures;(3) dendrometric measurements on planted woody species on a density from 96 to 625 plants/ha, and the excavations of their root systems. The soils are characterized by low levels of organic matter (<1%), and no calcium carbonate. Soil tillage through deep sub-soiling resulted in an improvement in soils quality marked by average proportions of clay (28.3%), silt (27.3%) on the anti-erosion structures, whereas the control sites are dominated by sand particles (64%) on average. The degradation mechanism of anti-erosion structures is mainly controlled by natural factors including topography, rainfall, and sand content of the soils with strong positive correlations (r ¼ 0:84; r ¼ 0:79; r ¼ 0:63 respectively). Restoration activities have led to the reconstitution of vegetation cover on degraded soils. Eucalyptus camaldulensis groups showed better adaptation as evidenced by their high structural shape parametres including Lorey's mean height (5.16-8.03 m), and mean crown diameter (1.66-3.3 m) with a tracer-type root system and high root density (74-88 roots) observed at 30 cm from the main stem. This study provides substantial information on the contribution of erosion control measures and their interactions with soil and vegetation resources. It constitutes a scientific tool that is well-adapted to the Sahelian (Niger, Mali, Burkina Faso, Chad, Mauritania and Senegal) context indispensable for the implementation of sustainable development strategies. The results thus obtained can be used as a reference for the choice of woody species to be planted according to the toposequence and the nature of the anti-erosion structures made, with a good control of their durability while taking into account the productivity of the soils.

show abstract

Efficacité des aménagements de lutte contre le ravinement: cas du bassin versant d’El Hnach (Tunisie)

Cited by 4 publications

References 23 publications

Gully prevention and control: Techniques, failures and effectiveness

Gully prevention and control: Techniques, failures and effectiveness

A review of the magnitude and response times for sediment yield reductions following the rehabilitation of gullied landscapes

Effects of restoration of degraded lands on soils physicochemical properties and adaptability of planted woody species in southwestern Niger

Contact Info

Product

Resources

About