2025 Volume 81 Issue 16 Article ID: 24-16163
The authors have already proposed a multiple regression model for the rainfall interception based on the product of wind speed and rainfall intensity as horizontal micro-droplet fluxes under the assump-tion that the downwind transport of micro-droplets pre-dominantly contribute to the rainfall interception process. Since the rainfall was implicitly incorporated into horizontal micro-droplet fluxes in the model, it was inconvenient not only for the practical purposes but also to analyse the non-linearity between the rainfall and rainfall interception. A wind-rain-index, namely the ratio of rainfall to rainfall interception, was newly defined as a function of wind speed and rainfall intensity in this paper and stochastically modelled. The new regression model with the wind-rain-index was applied to the observation data. It was clarified that the regression coefficient and the wind-rain-index accounted for the characteristics of tree species and non-linearity in the rainfall interception process.
