# Alluvial Fan Scree Deposits: Formation Characteristics and Erosion Mitigation Strategies
## 6 Conclusions  
The study establishes laboratory applications with a well-defined methodological sequence for using a specific polymer to evaluate sediment loss control. It employs soil loss assessment methods, including film characterization, rainfall erosion simulation, and environmental compatibility assessment, to analyze material loss in various forms of SH polymer application for soil protection. This research aims to present the behavior of the polymer in relation to water, its degradation when submerged in water, and in relation to rain erosion. 1. Film durability and mechanical performance. The SH polymer membranes (0.16-0.56 mm thickness) demonstrated exceptional anti-dissolution properties, retaining over 80% of their mass after prolonged immersion. Tensile tests revealed superior ductility, with elongation exceeding 250 mm after 3 days of immersion, while subsequent strength degradation stabilized, ensuring long-term structural integrity. This durability enables effective resistance against continuous surface runoff and raindrop impact, significantly enhancing AFSD stability during intense rainfall events. 2. Rainfall erosion mitigation efficacy. This study builds upon previous work by incorporating laboratory evaluations of SH polymer in controlling soil loss caused by rainfall erosion. Under simulated extreme rainfall (200 mm/h), SH polymer application at 1.0 kg/m\({}^{2}\) reduced surface erosion, while dosages \(\geq\) 1.5 kg/m\({}^{2}\) preserved near-complete slope integrity. The optimal application rate of (2.0 kg/m\({}^{2}\)) minimized soil loss (<1.2 g) across all tests, whereas field observations revealed that most erosion was extremely severe, further confirming the polymer's robustness in erosion control. 3. Terrain adaptability. The SH polymer exhibited consistent performance across diverse slope morphologies (planar/curved, smooth/rough), demonstrating universal applicability in AFSD environments. Even under a 200 mm/h rainfall for 60 min, treated slopes maintained structural stability with minimal erosion, highlighting the polymer's adaptability to varying field conditions. 4. Environmental compatibility. Ecological assessments, conducted through comparative experiments with various SH polymer concentrations, confirmed that SH polymer  
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\begin{tabular}{c c c c} \hline  & Covering the AFSD before spraying the SH polymer material & &  
films do not hinder vegetation growth, demonstrating excellent water permeability and retention. Tall fescue thrived in treated soils regardless of the application method (pre- or post-vegetation), highlighting the material's eco-friendly properties. * Limitations and future research directions. While demonstrating the SH polymer's effectiveness for AFSD stabilization, this study has limitations. Laboratory simulations may not fully replicate natural hydrologic-geomorphic interactions, necessitating field validation. Although immersion tests showed good durability, longer-term monitoring of wet-dry cycling performance is needed. While tall fescue growth was unaffected, long-term impacts on soil microbiota and nutrient cycling remain unassessed. The economic feasibility of large-scale implementation also requires investigation. Future work should prioritize field trials, extended performance monitoring, ecological impact assessments, and application technique optimization to enhance real-world applicability without compromising the technology's environmental compatibility. The research aims to investigate the behavior of the polymer in relation to water, its degradation when submerged, and its performance under rain erosion. It validates SH polymer as a sustainable, high-performance solution for stabilizing AFSDs, combining mechanical resilience, terrain versatility, and environmental safety. Its application is recommended for protecting critical infrastructure in arid and semi-arid regions while also supporting ecosystem health. Writing--original draft preparation, W.L., Q.L. and F.J.; writing--review and editing, W.L. and X.Y.