Abstract
Understanding the rainfall pattern is tough for the solution of several regional environmental issues of water resources management, with implications for agriculture, climate change, and natural calamity such as floods and droughts. Statistical computing, modelling and forecasting meteorological data are the key instruments for studying these patterns. This study aims to establish the rainfall trends of the two stations of Assam viz. Guwahati and Dhubri. The collected data is secondary in nature and obtained from the website of Global Precipitation Climatology Project (GPCP) of NASA, Goddard Space Flight Center, United States consisting of 36 years monthly rainfall records for the period 1979-2014. We have performed Sen’s slope method and Mann-Kendall test to assess the magnitude along with the statistical significance of trend. So far as monthly analysis is concerned, a gradual decrease in rainfall has been observed for maximum months in both the stations. Moreover, seasonal analysis has witnessed a noticeable similarity between the stations that is the presence of significant downward trend for winter and monsoon months over the entire period of 1979-2014.
Highlights
Water is one of the most important natural resources on earth that is necessary for sustenance of all forms of life
We have examined trend of historical rainfall data of two stations of Assam viz. Dhubri and Guwahati for the period of 1979-2014 by using above mentioned methodology
The rainfall characteristics especially variability and trend are necessary for the proper planning and management of water resources
Summary
Water is one of the most important natural resources on earth that is necessary for sustenance of all forms of life. The availability of water for various purposes is very much depending upon the amount of precipitation in that particular area. [10] Rainfall affects the environment and society in various ways ranging from water availability for livelihood and agriculture to the functioning of various industries, hydroelectric power generation etc. In order to determine the amount of water available to meet various demands such as agricultural industry, domestic water supply and for hydroelectric power supply, the rainfall received in that particular area plays an important role. Climate change is global in nature, potential changes may be consists of some dramatic regional differences. South-West monsoons have a significant impact on water resources for every sector of India as it brings nearly 80% of total rainfall in a year [12].
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