Is the turbid medium-based approach pertinent for estimating light interception when simulating the growth of a crop in an agri-photovoltaic system? - Archive ouverte HAL Access content directly
Journal Articles Biosystems Engineering Year : 2022

Is the turbid medium-based approach pertinent for estimating light interception when simulating the growth of a crop in an agri-photovoltaic system?

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Abstract

Today in the context of accelerating climate change and responses to it, cropping systems with intermittent shading are being developed. This is a new challenge, as existing crop models need to be adjusted. This work aims at estimating the radiation intercepted by the canopy in agri-photovoltaic conditions. In order to define if the current use of crop models allows to correctly be estimating the radiation intercepted by the plant canopy. In this study, the light interception based on the turbid medium approach is compared with a more accurate three-dimensional approach. This method realistically represents archi-tecturally contrasted canopies under a photovoltaic structure. According to the results obtained, the turbid medium approach allows an acceptable estimation of the radiation intercepted by the canopy changing over time, with this condition that the incident radi-ation is estimated at the height of the canopy. Indeed, when the incident radiation is estimated at ground level, as it is in several current studies, it will generate a bias in the estimation of the radiation intercepted by the canopy. This error in the estimate of the intercepted radiation can be between 17 and 20%. This is a major limitation to the current use of crop models in agri-photovoltaic conditions. To correct this problem in the calcu-lation of the turbid medium, a specific geometric calculation might be used under inter-mittent shading conditions, to adjust the incident radiation to the height of the canopy. In this case, the errors can be greatly reduced between 5% and 13%.
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Dates and versions

hal-03866960 , version 1 (23-11-2022)

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Sylvain Edouard, Abraham Escobar-Gutierrez, Mike van Iseghem, Romain Barillot, Gaëtan Louarn, et al.. Is the turbid medium-based approach pertinent for estimating light interception when simulating the growth of a crop in an agri-photovoltaic system?. Biosystems Engineering, 2022, 224, pp.131-142. ⟨10.1016/j.biosystemseng.2022.10.006⟩. ⟨hal-03866960⟩
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