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Annual and Seasonal Rainfall Trends in an Equatorial Tropical River Basin in Malaysian Borneo

  • M. V. Ninu KrishnanEmail author
  • M. V. Prasanna
  • H. Vijith
Article
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Abstract

Annual and seasonal rainfall trends in the Limbang River Basin (LRB), located in the equatorial tropics of Malaysian Borneo, have been characterised through Mann-Kendall and Spearman’s Rho non-parametric tests. Rainfall from 13 rain gauge stations in the LRB for the period 1948–2016 was examined in the present study. Basic statistical analysis of rainfall in the region indicates normal distribution, low missing percentage and homogenous characteristics of precipitation. Annual and seasonal rainfall in the LRB shows spatial variation while considering different rain gauge stations. In annual rainfall, eight stations showed a decreasing trend and five stations showed an increasing trend. Rain gauge stations which showed a statistically significant increase in annual rainfall were Limbang DID (2.77 and 2.85 mm/year) and Long Napir (3.65 and 3.77 mm/year). In recognising the two annual monsoon seasons in this area, a significant increase in rainfall was noticed in Long Napir (2.79 and 2.88 mm/year) during the Southwest monsoon (SWM) period. During the Northeast monsoon (NEM), along with Long Napir (3.90 and 3.95 mm/year), Limbang DID (2.86 and 3.02 mm/year), Pandaruan (1.82 and 1.87 mm/year) and Medamit Nanga (1.93 and 2.00 mm/year) also showed a significant increase in rainfall. At the same time, a distinct trend was noticed in rainfall amounts during the inter-monsoon (IM) periods. During the first inter-monsoon month (April), seven rain gauge stations showed an increasing trend in rainfall, whereas in the second inter-monsoon month (October), nine stations showed a decreasing rainfall trend. In April, Long Napir (1.86 and 1.95 mm/year) indicated a significant increasing trend, whereas in the month of October, the rain gauge station at Ukong showed a significant decreasing trend (− 2.45 and − 2.37 mm/year). Though minor spatial changes in trend characteristics were observed among the rain gauge stations, the LRB as a whole showed a consistent increasing (significant and non-significant) trend in annual and seasonal rainfall.

Keywords

Rainfall trend Mann-Kendall Spearman’s Rho test Equatorial tropics Limbang River Basin 

Notes

Acknowledgements

Authors are also thankful to the Editor in Chief, anonymous reviewer, expert referee and advisory editor for their critical reviews, constructive comments and suggestions, which significantly improved the quality of the manuscript.

Funding Information

The first author gratefully acknowledges the Curtin University Malaysia for providing financial support (CMPRS) and research facility during the study and the Department of Irrigation and Drainage (DID), Sarawak, Malaysia, for providing rainfall data.

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Applied Geology, Faculty of Engineering and ScienceCurtin University MalaysiaMiriMalaysia

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