Annual erosivity models using rain gauge records for the Pacific slope of Guatemala
DOI:
https://doi.org/10.36829/08ASA.v17i2.1503Keywords:
USLE, storm, precipitation, erosive days, kinetic energy of rain, rain gaugesAbstract
Erosivity is one of the six factors of the Universal Soil Loss Equation (USLE). To implement the correct soil conservation techniques, it is necessary to know the spatial and temporal variation of erosivity. The objective of this study was to generate models to estimate annual erosivity in the Guatemalan Pacific using rainfall information from 28 stations of the Guatemalan Private Institute for Climate Change Research. Two models were developed for each station using the daily and monthly precipitation data as an independent variable, and three regional models using the daily, monthly, and annual precipitation of all the stations as the independent variable. The erosivity of each storm was calculated according to the methodology proposed by Wischmeier & Smith (1978). The rainfall and erosivity records of the stations were fitted to a model of type R=(αP)^β. The quality of the results of the observed and estimated erosivities were evaluated by means of the percentage of bias statistics (PBIAS), the Nash-Sutcliffe coefficient (NSE), the standard deviation ratio (RSR) and analysis of variance The best results for the estimation of annual erosivity were obtained when regional models were used with monthly and annual precipitation data. The best model for estimating erosivity will be used to generate information in places where there are only rain gauges or to extend erosivity series on a monthly and annual scale in the Pacific of Guatemala.
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