Vol. 12, Issue 3 (2023)

Author(s):
Harshana Chandrakar and Shivam Mishra

Abstract:
The present paper is titled Spatial and temporal variability of rainfall pattern in the Mahasamund districts of Chhattisgarh state. The district-wise long term weather data (1981-2018) was collected from Department of Agrometeorology, IGKV, and Raipur. Rainfall pattern are generally described in two parts, with respect to time called as temporal rainfall pattern and other with respect to space and region know as spatial rainfall pattern. It is very important to know the historical changes in the mean annual rainfall and seasonal rainfall. Different indexes have been introduced like Walsh and Lawler introduced the “Rainfall Seasonality Index” which helps in evaluating the precipitation seasonality based on vector analysis which helps in understanding the seasonality pattern of precipitation. The method aims to characterize the distribution of precipitation throughout the year and to classify the climate of an area. Based on this view trend analysis, seasonality index and Precipitation Concentration Index was evaluated for Chhattisgarh plain agro climatic zone district Mahasamund. Based on those Mahasamund districts recorded significant increasing trend of rainfall at the rate of 8.9mm per year. The Seasonality Index was worked out on annual basis indicates that the districts falls in the range of 1.0-1.19 in which Mahasamund districts reported maximum value of Seasonality Index 1.25. It indicates that in these districts rainfall occur during 1 to 2 months. The outcome of Seasonality Index carried out on south-west monsoon basis indicates that the value was in the range of 0.33 to 0.39 in this districts means that the rainfall spread throughout the season. The result of Precipitation Concentration Index reported that entire districts falls under extreme seasonality category that is in the range of 28 to 31.2 it means they received rainfall within 1 to 2 months in the year.