Hi all,
I need to calculate rainfall erosivity for a basin in Thailand and due to data limitation, I only have daily rainfall data. I have been using the Arnoldus (1977) (as presented by Chen et al. 2023 - see attachment)to calculate annual rainfall erosivity. However, I am a little stumped on how to calculate monthly rainfall erosivity with this formula. I assume that I just need to remove the sum in the log part but am not 100% certain that is the right way to proceed.
Can anyone please let me know if my approach is correct and if not, how I should proceed in this case?
Many thanks
Article A systematic review of the incorrect use of an empirical equ...
Not really my field but it may not be as simple as that. The equation is for annual erosion. Suppose all rain fell in January only (month i) and none otherwise. yhen Pi =P
then sigma (over i) Pi 2 / P - 0.8188 would be P2/P-0.8188 =P-0.8188 and Annual erosion = 17.02 x 10 exp (1.5 x log (p-0.8188)). This is not the monthhly erosion in January because the effect of that rain would be felt over the whole year and this effect would be different in different localities/ climates etc.
This is an empirical equation calibrated for annual erosion not monthly erosion.
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