Rainfall Trend of Imphal Watershed Using Innovative Trend Analysis

Rebati Sinam^1,

¹Centre for the Study of Regional Development, Jawaharlal Nehru University, New Delhi, India

Cite this paper:
Rebati Sinam. Rainfall Trend of Imphal Watershed Using Innovative Trend Analysis. Applied Ecology and Environmental Sciences. 2022; 10(6):368-381. doi: 10.12691/aees-10-6-6

Abstract

Rainfall is one of the most important meteorological elements that affects how living and non-living species exists on this planet. Innovative Trend Analysis (ITA) was developed by Zekai Sen as an alternative to conventional Mann Kendall test for trend analysis. Unlike the Mann-Kendall test, ITA is free from the problem of serial correlation and have no assumptions. Attempt has been made to analyse the rainfall trend of Imphal watershed using IMD 0.25° X 0.25° resolution gridded data. Imphal watershed has been divided into 24 grids named G1 to G24. Results show that there are cases of both negative and positive trend in annual rainfall. Winter rainfall has negative trend in all the grids. The southern part of the grid points experiences positive changes while the northern part has either no trend or negative trend. G2, G3 and G6 have significant positive trends during annual rainfall and pre-monsoon rainfall. The rainfall category wise analysis shows that high intensity rainfall in all the grids have positive tendency while the low and medium rainfall have negative or no trend behavior. There have been isolated cases of very high rainfall which affect the overall trend and the slope of change. As reiterated by other authors, ITA is a new and reliable tool for understanding the trend and unveiling the hidden trend of time series.

Keywords:
Imphal innovative trend analysis rainfall trend rainfall gridded data

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