Examining Drought Behaviour Using Departure Index and Rainfall Anomaly Index for Nambiyar River Basin, Tamil Nadu

R Rajee; V Emayavaramban

doi:10.53989/bu.ge.v10i2.2

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Geo-Eye

DOI: 10.53989/bu.ge.v10i2.2

Year: 2021, Volume: 10, Issue: 2, Pages: 5-9

Original Article

Examining Drought Behaviour Using Departure Index and Rainfall Anomaly Index for Nambiyar River Basin, Tamil Nadu

R Rajee^1*, V Emayavaramban²

¹Research Scholar, Department of Geography, Madurai Kamaraj University, 625 021, Madurai
²Professor, Department of Geography, Madurai Kamaraj University, 625 021, Madurai

*Corresponding author
Email: [email protected]

Received Date:02 July 2021, Accepted Date:29 November 2021

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Drought is caused by a lack of long-term rainfall. The humans as well as environment are greatly affected due to drought. It is not related to particular climate regions but it causes similar effect in all climatic regions of the world. There are a number of drought prone areas in India so the Government of India has developed a Drought Affected Area Plan which is being implemented in drought prone areas. An attempt has been made in this paper studying two drought indices such as Departure Index (DI) and Rainfall Anomaly Index (RAI) in Nambiyar River Basin of Tamil Nadu to assess the drought condition. Only 3 classifications (moderate, mild and no droughts) are observed in Departure Index. Mild drought years are highly found in Nambiyar River basin followed by moderate and no droughts. Chidambarapuram, Nainaputhoor station had maximum drought of 24 years and 6 years of moderate drought is observed in Vallioor station. The frequency of drought years for RAI index are repeatedly noted high during the year 2003, 2016 and Keeriparai station had the highest negative anomaly value of -10.67 in the year 2017.

Keywords: Rainfall; RAI; DI; Nambiyar river basin; Drought

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Copyright

© 2021 Rajee & Emayavaramban. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Published By Bangalore University, Bengaluru, Karnataka