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The Photovoltaic Panel Array Inhibits Initial Rill Development and Soil Erosion During Rainfall‐Runoff Processes in a Soil Slope
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The Photovoltaic Panel Array Inhibits Initial Rill Development and Soil Erosion During Rainfall‐Runoff Processes in a Soil Slope
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The Photovoltaic Panel Array Inhibits Initial Rill Development and Soil Erosion During Rainfall‐Runoff Processes in a Soil Slope
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Journal Article
The Photovoltaic Panel Array Inhibits Initial Rill Development and Soil Erosion During Rainfall‐Runoff Processes in a Soil Slope
2025
Overview
Large‐scale photovoltaic (PV) panel installations may significantly affect local hydrological processes, especially in hilly and mountainous regions. However, there is large uncertainty in assessing the hydrological impacts of PV power stations, as the effects of PV panel arrays on overland flow and rill erosion processes in hillslopes have been overlooked. This study quantitatively investigated the interactions between overland flow, soil loss, and rill development influenced by a PV panel array through artificial rainfall experiments on a loess slope with bare surface. The dynamics of overland flow and soil erosion processes in the slope with a four‐panel PV array were compared to a control slope. In the experiments, it was observed that the rill development in the PV slope was largely inhibited. The experiment results demonstrated that, under varying rainfall intensities, the soil erosion mass and the peak erosion rates of the PV slope was 39.7%–64.1% and 38.0%–52.5% less than the control slope, respectively. The reason for this soil erosion mitigation might be that the PV panel array attenuated the impact of rainfall by blocking raindrops, and diminished the overland flow velocity as well as its concentrating movement into rills. These reduced the erosivity of overland flow and decreased soil particle detachment and movement in the slope, which ultimately inhibited rill development and erosion. These findings provide a quantitative basis for accurately assessing the early stage environmental impact of PV power stations, suggesting that large PV installations in arid and semi‐arid regions may reduce initial soil erosion.
