Análisis de la variabilidad de la precipitación en el régimen pluviométrico, en la ciudad de Riobamba.

Abstract

Preliminary studies indicated that rainfall in Chimborazo province has varied to a growing trend in recent decades. In Riobamba city, which is part of the region, the variability of rainfall was determined over 42 years, from 1976 to 2017. For this purpose, the weather records of the Higher Polytechnic School of Chimborazo meteorological station were used, which included data on precipitation, maximum temperature, and minimum temperature. These date were validated by exposing them to quality control and homogenization, were they identified missing data and the absence of inconsistent data. Eleven climatic extreme indices were calculated using the Rclimdex weather program to determine the variability, of which R10mm, R99p, RX1day, RX5day, and SDII were statistically significant for the study. The R10mm indicated an increase in days with high rainfall, R99p an increase in precipitation by 7mm per decade, RX1day and RX5day reported increases of 4mm per decade on the rainiest days of the year; while SDII determined increases in rainfall intensity. With these indicators it was concluded that there is up to 95% confidence that there are variations in the behavior of rainfall during the last 42 years in the city of Riobamba, registering an increase in the level of the rainfall regime. It is suggested to carry out hydrographic orographic, and vegetation studies to determine the possible causes of climatic variability in Riobamba city.