Estimation of sediment deposits in the Ghézala reservoir in northern Tunisia

Mathlouthi, Majid; Lebdi, Féthi

doi:10.5194/piahs-377-35-2018

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Tolessa et al (2019) demonstrated that the expansion of cultivated land to the detriment of natural vegetation is significantly affecting the natural resources. Also, Mathlouthi and Lebdi (2018) have reported that the pressure exerted on the soil by ploughing as well as overgrazing to meet the needs of the population of a specific watershed in Tunisia has led to the continued soil deterioration manifested by increased erosion and sedimentation in the reservoirs. In fact, agricultural and silvopastoral lands in Tunisia have undergone important changes, since the beginning of the 20 th century.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal analysis of landscape patterns and its effect on soil loss in the Rmel river basin, Tunisia

Bouguerra¹,

Jebari²,

Tarhouni³

2020

Soil & Water Res.

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Changes in land use and land cover (LULC) are generally associated with environment pollution and the degradation of natural resources. Detecting LULC changes is essential to assess the impact on ecosystem services. The current research studies the impact of the LULC change on the soil loss and sediment export in a period of 43 years from 1972 to 2015. Landsat imageries were classified into five classes using a supervised classification method and the maximum likelihood Algorithm. Then, the sediment retention service for avoiding reservoir sedimentation was assessed using the InVEST SDR (integrated valuation of ecosystem services and trade-offs sediment delivery ratio) model. The results showed that the changes are very important in this study period (1972–2015). Forests were reduced by 18.72% and croplands were increased by approximately 54%. The InVEST SDR model simulation results reveal an increase in the sediment export and soil loss, respectively, from 1.68 to 5.57 t/ha/year and from 15.22 to 43.61 t/ha/year from the year 1972 to 2015. These results highlight the need for targeted policies on integrated land and water resource management. Then, it is important to improve the common understanding of land use and land cover dynamics to the different stakeholders. All these can help in projecting future changes in the LULC and to investigate more appropriate policy interventions for achieving better land and water management.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal analysis of landscape patterns and its effect on soil loss in the Rmel river basin, Tunisia

Bouguerra¹,

Jebari²,

Tarhouni³

2020

Soil & Water Res.

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Impact of flow on the deposition and sediment trapping capacity in a West African reservoir (case of the Lobo River reservoir, west-central of Côte d’Ivoire)

Koffi,

Sanchez,

Kouamé

et al. 2023

Environ Earth Sci

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Built to improve the water supply of the populations of the city of Daloa, the water reservoir of the Lobo River is no longer functioning properly due to sedimentation phenomena. This study aims to understand the hydrosedimentary functioning of the reservoir for better management. Based on the river flows, bathymetric surveys, suspended solids concentrations, settling velocity, a two-dimensional modelling of the flows and sedimentation of the Lobo River reservoir was carried out using the MIKE 21FM/MT software. The simulation results indicate that the hydrodynamic model could reproduce the variation of water levels at the free surface of the reservoir. The results are very sensitive to the boundary conditions of the model but also to the initial conditions. A strong influence of the initial conditions on the long-term stability of the models was observed. It could be seen that in all cases the deposition rate tends towards a final value which only depends on the river flow. The trapping efficiency of the reservoir is between 26.7% and 80.4%. The different simulation scenarios indicate that the deposition thicknesses are between 0.02 and 48 mm and that the deposition occurs when the flow is loaded, during the rise and fall phase of the hydrograph. The old intake, the new intake and the weir are the preferred areas for sediment deposition in the Lobo reservoir.

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Estimation of sediment deposits in the Ghézala reservoir in northern Tunisia

Cited by 2 publications

References 7 publications

Spatiotemporal analysis of landscape patterns and its effect on soil loss in the Rmel river basin, Tunisia

Spatiotemporal analysis of landscape patterns and its effect on soil loss in the Rmel river basin, Tunisia

Impact of flow on the deposition and sediment trapping capacity in a West African reservoir (case of the Lobo River reservoir, west-central of Côte d’Ivoire)

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