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<p>Quantifying water erosion in basins is crucial for improving the hydraulic management of dams. In Algeria, where water erosion is the primary cause of basin degradation and dam silting, it is crucial to distinguish and measure both gross erosion and sediment transport to accurately estimate the sediment delivery ratio. For the Wadi Isser Basin (4147 km<sup>2</sup>, north-central Algeria), this article estimates soil loss using the RUSLE model and downstream sediment transport based on measurements and rating curves. The RUSLE model, implemented using a geographic information system (GIS) with a seasonal image series for vegetation cover factor C, estimates a mean annual loss of 25.80 t ha<sup>−1</sup>&#xa0;y<sup>−1</sup> in the Wadi Isser Basin from 1970–1971 to 2016–2017. In parallel, data series of discharge and concentration collected at the downstream hydrometric station of Lakhdaria from 1986–1987 to 2014–2015 indicate a specific degradation (SD) of 2.40 t ha<sup>−1</sup>&#xa0;y<sup>−1</sup>. Over the common period (29&#xa0;years), soil losses are estimated at an annual average of 25.60 t ha<sup>−1</sup>&#xa0;y<sup>−1</sup>, revealing a sediment delivery ratio of 0.09 at the Lakhdaria station.</p>

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Water erosion, sediment transport, and sediment delivery ratio in the Wadi Isser Basin (north-central Algeria): insights from the RUSLE model and sediment rating curves

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Abdelhak Bouharira,
  • Mohammed Achite,
  • Taoufik Hermassi,
  • Abderrezak Kamel Toubal,
  • Sylvain Ouillon

摘要

Quantifying water erosion in basins is crucial for improving the hydraulic management of dams. In Algeria, where water erosion is the primary cause of basin degradation and dam silting, it is crucial to distinguish and measure both gross erosion and sediment transport to accurately estimate the sediment delivery ratio. For the Wadi Isser Basin (4147 km2, north-central Algeria), this article estimates soil loss using the RUSLE model and downstream sediment transport based on measurements and rating curves. The RUSLE model, implemented using a geographic information system (GIS) with a seasonal image series for vegetation cover factor C, estimates a mean annual loss of 25.80 t ha−1 y−1 in the Wadi Isser Basin from 1970–1971 to 2016–2017. In parallel, data series of discharge and concentration collected at the downstream hydrometric station of Lakhdaria from 1986–1987 to 2014–2015 indicate a specific degradation (SD) of 2.40 t ha−1 y−1. Over the common period (29 years), soil losses are estimated at an annual average of 25.60 t ha−1 y−1, revealing a sediment delivery ratio of 0.09 at the Lakhdaria station.