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<p>The Rommani region of central Hercynian Morocco is characterized by Paleozoic outcrops shaped during the Hercynian orogeny, giving rise to a well-structured hydrographic network classified into five stream orders. This study investigates the role of fractures in controlling this drainage network organization. The integration of lineaments automatically extracted from Landsat 8 OLI/TIR satellite imagery superimposed with geological fault data, as well as a hydrographic network and slope map derived from a Digital Elevation Model (DEM), within a Geographic Information System (GIS) framework, enabled the production of a Geomorphostructural and correlation maps. Circular statistical analysis was then applied to quantitatively assess the structural control on drainage organization. The results reveal that the Rommani region is influenced by 1104 faults, predominantly oriented east-west, with secondary orientations in the northeast-southwest direction. Slope and fracturing jointly control the drainage network: topography predominantly directs higher order streams, while structural orientations constrain lower and moderate order streams (orders 1 and 3). These findings highlight the dual role of topographic relief and tectonic structures in controlling surface water flow within this structurally complex region.</p>

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Integrated remote sensing, GIS, and circular statistical analysis for assessing the role of fractures in surface water circulation: a case study of the Rommani area, Northwestern Morocco

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Oumaima Ould saltana,
  • Jamal Chao,
  • Abdelaziz Mridekh,
  • Hassan Echerfaoui,
  • Bouabid El mansouri

摘要

The Rommani region of central Hercynian Morocco is characterized by Paleozoic outcrops shaped during the Hercynian orogeny, giving rise to a well-structured hydrographic network classified into five stream orders. This study investigates the role of fractures in controlling this drainage network organization. The integration of lineaments automatically extracted from Landsat 8 OLI/TIR satellite imagery superimposed with geological fault data, as well as a hydrographic network and slope map derived from a Digital Elevation Model (DEM), within a Geographic Information System (GIS) framework, enabled the production of a Geomorphostructural and correlation maps. Circular statistical analysis was then applied to quantitatively assess the structural control on drainage organization. The results reveal that the Rommani region is influenced by 1104 faults, predominantly oriented east-west, with secondary orientations in the northeast-southwest direction. Slope and fracturing jointly control the drainage network: topography predominantly directs higher order streams, while structural orientations constrain lower and moderate order streams (orders 1 and 3). These findings highlight the dual role of topographic relief and tectonic structures in controlling surface water flow within this structurally complex region.