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1 Acta Geophysica

1 2024

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Characterizing spatiotemporal properties of precipitation in the middle Mahanadi subdivision, India during 1901-2017

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Sahu R. T. , Verma S. , Verma M. K. , Ahmad I.

tom Vol. 72, no. 2

1143--1158

Long-term historical data and their interpretation are crucial aspects of understanding any kind of variation that exists as a result of changing environmental behaviour. The focus of the study is to characterize precipitation properties in the middle subdivision of the Mahanadi River basin (MRB). An eigen-based technique, also known as the maximum loading value approach, and gridded precipitation data with a resolution of 0.25° X 0.25° are presented to analyze the spatiotemporal properties of precipitation at different timeslot intervals. The meteorological data (gridded precipitation for 117 years from 1901 to 2017) has a special “k” field for spatial and temporal modes of spatial pattern analysis, which aids in the recognition of precipitation properties. The identified characteristics of the exclusive timeslot periods have been assessed for any dispersion as a function of annual precipitation. To cross-validate the identified patterns for distinctness and pairwise comparison, the Kolmogorov-Smirnov’s D test was used. Southwest Mahanadi does not experience much variation in pattern size (± 3-5%), with a maximum variance of 39.09% during timeslot 2 (1940-1978). Similarly, the southeast Mahanadi observed a continuous increase in pattern size and was above 10% with a maximum variance of 28.53% during timeslot 3 (1979-2 017). While north-eastern Mahanadi experienced a continuous and significant decrease of > 14% of the total variance, with a maximum (42.48%) during timeslot 1 (1901-1939) and a minimum (28.14%) during timeslot 3 (1979-2017). There is no spatial pattern variability from summer to any of the timeslot intervals.