Abstract
The installation of solar parks requires extensive areas and results in soil erosion in many cases. One suitable solution is applying lime to improve soil characteristics, such as mechanical strength, stability, workability, durability, and internal and surface erosion resistance. This soil treatment is of particular importance when dealing with hydraulic structures conceived in the solar park drainage systems. The erodibility tests were performed in a solar complex soil in an EFA apparatus constructed to measure the erosion rate of cohesive and non-cohesive soils in different flow rates. The tests were performed with or without 3% lime addition and two compaction conditions. The experiments indicated that the erodibility of lime-treated soils represents between 26% and 12% of the values obtained from untreated soils and under reduced compaction. The values ranged from 16% to 7% for controlled compaction. The results represent a significant reduction in the soil erodibility treated with lime even with reduced compaction, performing an efficient, economical, and sustainable solution for erosion control.
Highlights
The introduction of solar parks in Brazil is a recent and prominent enterprise, especially considering environmental requirements related to clean and renewable energy
The results demonstrated a considerable reduction in the soil erodibility factor when stabilized with lime for both the Normal Proctor (NP) and reduced compaction tests
The results obtained in this study indicated that the erodibility of lime-treated soils, with 3% lime addition by mass, represents between 26% and 12% of the values obtained from untreated soils, both under reduced compaction
Summary
The introduction of solar parks in Brazil is a recent and prominent enterprise, especially considering environmental requirements related to clean and renewable energy. Solar parks are distinguished environments in terms of water drainage and erosion control. During implementation and in the operation phase of solar parks, some topics are of great relevance for understanding erosion. There is the removal of vegetation cover and topsoil, the formation of sites that concentrate the water flow, and changes in the park surface. Solutions for erosion control must be investigated, mainly to cover all aspects of the enterprise, promoting less risk and more effective measures. Issues related to erosion are still considered complex, with a multivariate influence of factors, causing several socio-environmental and economic consequences. One aspect of great relevance to understanding erosion processes is erodibility. Erodibility links to the soil's inherent properties, such as texture, apparent density, porosity, structure, soil particle size percentages, organic matter content, and soil permeability (Bertoni & Lombardi Neto, 1999)
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