A Study on Shading Effect of Solar Radiation by Vegetation

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The objective of this research is to demonstrate the possibility of investigating a shading effect of solar radiation by vegetation by solving numerically a radiation transfer equation within vegetation, without measuring the shading effect of vegetation as it was done conventionally. A radiation transfer model within vegetation which is high in reliablitity is necessary to estimate the shading effect of vegetation. The radiation transfer model within vegetation by Ross is one of the most excellent. The examination of Ross'es model was done and its problems were considered in this research. The reliability of the Ross'es model was examined by comparison between the numerical results of the model and the measurement. It was proved that the model is able to be applied to practical use. The approximation solution of the Ross'es model was derived. The diffusion approximation was proved to be applicable to a three dimensional radiation filed within vegetation. It was investigated analytically how the incident solar radiation was decreased by the vegetation which was located outside a wall. It was demonstrated that the numerical estimation of shading the incident solar radiation by vegetation is possible by solving the radiation transfer model within vegetation by Ross, without the measurement of solar radiation within vegetation.