Bulletin of Geography. Physical Geography Series https://apcz.umk.pl/BOGPGS <div align="justify"> <p><strong>eISSN: 2300-8490 </strong></p> <p><strong>ISSN: 2080-7686</strong></p> <p><strong>Publication fee </strong></p> <p>Bulletin of Geography. Physical Geography Series is funded by the Nicolaus Copernicus University in Toruń. For this reason, publication in the Journal is <strong>free of charge.</strong></p> <p><strong>Dear Authors,</strong></p> <p><span style="font-size: 0.875rem;">The main aim of the Bulletin of Geography. Physical Geography Series is to present scientific findings in physical geography and related subjects. The journal covers the following fields/area: climatology, geomorphology, glaciology, hydrology, soil-science, biogeography and research methods in physical geography, with an emphasis on Poland, Europe, and polar regions.</span></p> </div> <div> <h4>Publish open access in this journal</h4> <p><strong>Journal Indexes</strong></p> <p>Scopus (CiteScore 2021 - 1.4, SJR 2021 - 0.258<br />SNIP 2021 - 0.493)<br />Web of Science - Clarivate Analytics, Emerging Sources Citation Index<br />JCI - 0.22<br />Index Copernicus 100.00</p> <p>40 points in the evaluation of the Polish Ministry of Education and Science</p> <p>Read <a href="http://wokinfo.com/products_tools/multidisciplinary/esci/">more</a> about ESCI Thomson Reuters.</p> <p> </p> <h4>Publication Ethics and Malpractice</h4> <p>Get to know the publication ethics and malpractice <a href="https://box.pionier.net.pl/f/da858d4b132748a29373/?dl=1">more</a> ...</p> <p> </p> <h4>Frequently Asked Questions </h4> <p>How to create an account, log in, add an article ...? read <a href="https://box.pionier.net.pl/f/db6a9973ce2442c6a120/?dl=1">more</a> ...</p> <p> </p> <p> </p> </div> Uniwersytet Mikołaja Kopernika w Toruniu en-US Bulletin of Geography. Physical Geography Series 2080-7686 The Statistical analysis of rainfall trend and its variability (1901–2020) in Kolkata, India https://apcz.umk.pl/BOGPGS/article/view/37500 <p>The current study focuses on the altering historical rainfall data analysis and its variability in Kolkata (Kolkata Municipal Corporation), a metropolitan city in India. The research area experiences detrimental urban floods (pluvial floods) at near-annual regularity during the monsoon, and during the pre-monsoon seasons it commonly experiences water shortage problems. Analysing trends and temporal variability of rainfall over 120 years from 1901 to 2020 is the main objective of this study. The original Mann–Kendall (M–K) test has been applied to the rainfall dataset in conjunction with Sen’s Slope Estimator using Python 3.10, after the Durbin-Watson (DW) statistic initially suggested that there is no serial correlation effect. The M–K test, with a Kendall’s tau of 0.17058 (significant at a 5% level), shows an upward trend in annual rainfall between 1901 and 2020. The Sen’s slope, which measures the rate of change annually, has a value of 2.48152. Regression analysis and other dispersion measures are also used in this study to investigate the monthly rainfall trend and its variability. The phase-wise (30-year) analysis of annual rainfall variability reveals a considerable variation over 120 years. While fitting the linear regression line month by month over the entire <br />period, mostly negative trends were found in the pre-monsoon and positive trends in the monsoon and post-monsoon seasons. The findings of this analysis could be useful to urban planners for water supply and management in the study area. The primary concern of planners for effectively managing rainwater and the accompanying issues should be the growing variability of annual precipitation.</p> MD JUBER ALAM ARIJIT MAJUMDER Copyright (c) 2022 MD JUBER ALAM, ARIJIT MAJUMDER https://creativecommons.org/licenses/by-nd/4.0 2022-09-26 2022-09-26 23 5 16 10.12775/bgeo-2022-0006