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<p>Extreme rainfall events pose significant challenges to the stability of steep slopes in mountain regions by intensifying runoff generation, soil erosion, and progressive strength degradation. Addressing these challenges requires an integrated understanding of hydrological, geomorphological, and mitigation processes. This study presents a multi-process assessment of soil-water-erosion dynamics in steep slopes reinforced with bio-based coir geocells under simulated extreme rainfall conditions. Large-scale laboratory slope models inclined at 30° and 45° were subjected to high-intensity rainfall of 200 mm/h for 180 minutes to investigate coupled runoff response, infiltration behavior, surface erosion evolution, and post-rainfall strength characteristics. Spatial and temporal erosion patterns were quantified using highresolution image-based analysis, while in-situ moisture measurements captured dynamic changes in soil water distribution. The effectiveness of coir geocell reinforcement was evaluated through comparative analysis between reinforced and unreinforced slopes, focusing on runoff regulation, erosion mitigation, and strength retention. The results demonstrate that coir geocell reinforcement significantly modifies the integrated hydro-geomorphological response of steep slopes. Soil loss was reduced by 66.7% and 81.8% for slopes inclined at 30° and 45°, respectively, under extreme rainfall. Infiltration rates increased from 43.78 to 51.62 mm/h at 30° and from 18.06 to 28.79 mm/h at 45°, accompanied by reduced surface runoff and suppression of progressive rill and gully formation. The combined effects of soil confinement and enhanced surface roughness effectively limited soil detachment and preserved post-rainfall unconfined compressive strength. Moisture distribution analysis further indicated more uniform wetting fronts and reduced preferential flow paths. The findings highlight the importance of multi-process integration in understanding rainfall-induced slope degradation and demonstrate the potential of biodegradable coir geocell systems as nature-based solutions for erosion control in mountain environments, contributing to climate-resilient slope management frameworks.</p>

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Multi-process assessment of soil-water-erosion dynamics in coir geocell-reinforced steep slopes under extreme rainfall

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Sandeep Kumar Namburu,
  • Sreevalsa Kolathayar,
  • Hasthi Venkateswarlu

摘要

Extreme rainfall events pose significant challenges to the stability of steep slopes in mountain regions by intensifying runoff generation, soil erosion, and progressive strength degradation. Addressing these challenges requires an integrated understanding of hydrological, geomorphological, and mitigation processes. This study presents a multi-process assessment of soil-water-erosion dynamics in steep slopes reinforced with bio-based coir geocells under simulated extreme rainfall conditions. Large-scale laboratory slope models inclined at 30° and 45° were subjected to high-intensity rainfall of 200 mm/h for 180 minutes to investigate coupled runoff response, infiltration behavior, surface erosion evolution, and post-rainfall strength characteristics. Spatial and temporal erosion patterns were quantified using highresolution image-based analysis, while in-situ moisture measurements captured dynamic changes in soil water distribution. The effectiveness of coir geocell reinforcement was evaluated through comparative analysis between reinforced and unreinforced slopes, focusing on runoff regulation, erosion mitigation, and strength retention. The results demonstrate that coir geocell reinforcement significantly modifies the integrated hydro-geomorphological response of steep slopes. Soil loss was reduced by 66.7% and 81.8% for slopes inclined at 30° and 45°, respectively, under extreme rainfall. Infiltration rates increased from 43.78 to 51.62 mm/h at 30° and from 18.06 to 28.79 mm/h at 45°, accompanied by reduced surface runoff and suppression of progressive rill and gully formation. The combined effects of soil confinement and enhanced surface roughness effectively limited soil detachment and preserved post-rainfall unconfined compressive strength. Moisture distribution analysis further indicated more uniform wetting fronts and reduced preferential flow paths. The findings highlight the importance of multi-process integration in understanding rainfall-induced slope degradation and demonstrate the potential of biodegradable coir geocell systems as nature-based solutions for erosion control in mountain environments, contributing to climate-resilient slope management frameworks.