Spatial and temporal estimation of the erosivity factor R based on daily rainfall data for the department of Atlántico, Colombia

Humberto Fabián Avila Rangel, Boris Daniel Avila Rangel
2015 Ingeniería e Investigación  
<p class="Abstractandkeywordscontent"><span lang="EN-US">Soil erosion caused by rain is the detachment and movement of soil particles caused by the impact of raindrops on the surface. Erosivity factor R is a measure of the rain erosive power used for estimating the erosion rate with the RUSLE method (Revised Universal Soil Loss Equation). Estimating R factor requires rainfall intensity records of storms greater than 12.5 mm or greater than 6 mm but longer than 15 min. However, most of the
more » ... ian rainfall stations have daily rainfall records with which it is not possible to estimate the intensity of each storm and, therefore, makes it difficult to estimate the R factor for a specific area. In this paper a methodology for estimating the erosivity factor R for the department of Atlántico, Colombia from daily records of 16 IDEAM stations is presented. The spatial distribution of the erosivity factor R in the department and its temporal distribution throughout the year are also shown. The results showed a minimum erosivity factor R of 6,894 MJ∙mm∙Ha<sup>-1</sup>∙Hr<sup>-1</sup>∙yr<sup>-1</sup> and a maximum of 10,925 MJ∙mm∙Ha<sup>-1</sup>∙Hr<sup>-1</sup>∙yr<sup>-1</sup>. The average erosivity factor R for the department of Atlántico was 8,697 MJ∙mm∙Ha<sup>-1</sup>∙Hr<sup>-1</sup>∙yr<sup>-1</sup>. This methodology might be used for estimating the erosion factor R in different Colombian regions where high-resolution precipitation data is limited, but seasonal and orographic conditions should be considered for selecting the rain gages and the area of study.</span></p>
doi:10.15446/ing.investig.v35n2.47773 fatcat:pt4o2hdtebethibwinteongfju