LONG TERM TREND ANALYSIS OF RAINFALL, MAXIMUM AND MINIMUM TEMPERATURE IN KRISHNA UPPER BASIN REGION OF INDIA
Authors
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I. BHASKARA RAO*, M. NEMICHANDRAPPA, K. V. RAO, B. S. POLISGOWDAR, G. V. SRINIVASA REDDY, A. G. SREENIVAS and M. Y. AJAYA KUMAR
Dept. of Soil and Water Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur- 584 104
Abstract
The study was conducted in Krishna Upper basin covering parts of Karnataka and Maharashtra
States with an aim to study the spatial and temporal variability of rainfall and temperature trend on
annual and seasonal basis. This study utilized the IMD grid rainfall, maximum and minimum temperature
data for a period of 119 years (1901 to 2019) and 69-years (1951-2019), respectively. Mann-Kendall
(MK) test and Sen’s slope estimator test were used to detect the statistical significance trend and the
magnitude trend of time series respectively. A positive trend in the annual rainfall data was also
observed as 0.557 mm/ year for the study area. An increasing trend of rainfall in the months of June
and August was found to be significant. Among all the seasons, it is witnessed that the monsoon
rainfall increased BY 0.528 mm/year. The study concluded that there was lot of spatial variability in
rainfall trend across the study area particularly in annual and monsoon seasons and less variability
in pre-monsoon, post-monsoon season and winter seasons. The maximum temperature observed
was statistically significant with increasing trend in all the months, seasons and annual maximum
temperature. There was an increase in annual maximum temperature by 0.02 oC per year. It was
recorded that the trend minimum temperatures in a month was not statistically significant.
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