SPATIOTEMPORAL CHARACTERISTICS OF EXTREME RAINFALL EVENTS OVER JAVA ISLAND, INDONESIA

https://doi.org/10.22146/ijg.2391

Supari Supari(1*), Sudibyakto Sudibyakto(2), Janneke Ettema(3), Edvin Aldrian(4)

(1) 
(2) 
(3) 
(4) 
(*) Corresponding Author

Abstract


The patterns and trends of extreme daily rainfall within period of 1981 – 2010 have been
analyzed for Java Island, Indonesia particularly East Java Province. A set of extreme indices
recommended by WMO were calculated using high quality data from 84 rain stations to
express the frequency and intensity of those events. The spatial patterns was identified by
mapping climatological mean of indices while temporal trends was assessed using the nonparametric
Mann-Kendal test. The study found that the spatial pattern of extreme rainfall
events over East Java Province is generally characterized by low frequency and intensity in
the coastal area, and high frequency and intensity in the mountainous area. The dominant
finding from trend assessment is not-significant trend. However, the consistently significant
trend was observed in some districts. Rain stations in District of Ponorogo, Ngawi,
Bojonegoro, Gresik and Sumenep showed significant negative trend for almost all indices
whereas significant positive trend was found in District of Surabaya and Pasuruan.


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DOI: https://doi.org/10.22146/ijg.2391

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Accredited Journal, Based on Decree of the Minister of Research, Technology and Higher Education, Republic of Indonesia Number 30/E/KPT/2018, Vol 50 No 1 the Year 2018 - Vol 54 No 2 the Year 2022

ISSN 2354-9114 (online), ISSN 0024-9521 (print)

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