Spatial and Temporal Rainfall Trend Analysis: At Assosa &Bambasi in Assosa Zone,BenishangulGumez Region, Ethiopia

Abstract

The main aim of this study was investigated the temporal (annual, seasonal, monthly) rainfall and its spatial distribution with in Assosa and BambasiStations. In Ethiopia, rainfall is variable climate element both of them amount and distribution. The assessment used historic climatic data (Rainfall data (1989-2021) were collected from Assosa meteorological service center. Based on the 33 year period rainfall record, analysis was carried out to extract the trends of seasonal and annual rainfall. Correlation of annual rainfall between the two stations in the period of 1989-2021 is around 0.35 that mean medium.They are in the same rainfall regime; the correlation shows that they have positive correlation. The coefficient of variation and standard deviation for 1989 to 2021 ranged from 0.2 to 0.3,respectively, confirming the moderate variability of the mean monthly rainfall over the two stations. This shows that outside of the 4-months rainy period, there are highly variableBelg and Bega. In this result, the mean annual rainfall coefficient of variability Is indicated moderate to high rainfall variability and both variables tend to positive relationship.

Keywords: Trends, Climate change, Rainfall Variability, Benishangul Gumez,Ethiopia

DOI: 10.7176/JEES/14-1-02

Publication date: January 31^st 2024