Trends in precipitation in Thailand from 1964 to 2012

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Published: Apr 26, 2017
DOI: https://doi.org/10.14456/apst.2016.19
Keywords:
Precipitation trend Indices Thailand Mann-Kendall Theil-Sen’s estimator

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Lukas Beule
Faculty of Geoscience and Geography, University of Goettingen, Goldschmidtstrasse 3, Goettingen, Germany
Jan -Frederik Lanhenke
Faculty of Geoscience and Geography, University of Goettingen, Goldschmidtstrasse 3, Goettingen, Germany
Sarintip Tantanee
Faculty of Engineering, Naresuan University, Phitsanulok, Thailand

Abstract

In the present study, trends in 6 annual precipitation indices (CDD, CWD, R10, R20, RX1, and SDII) to observe long term trends in precipitation have been investigated for 48 stations over Thailand from 1964 to 2012. Trends were estimated using Mann-Kendall Test and Theil-Sen’s estimator. In general, the number of dry days is increasing, while the number of wet days is decreasing. The number of days with precipitation amounts above 10 and 20 mm showed opposite trends with no spatial coherence, which could be attributed to the relatively low station density. However, the slight majority of these trends is increasing. The maximum 1-day precipitation amount index showed a non-significant, spatial coherent increase in the central-west of North Thailand. Applying the simple daily intensity index, the majority of trends is increasing, whereas no spatial coherence was found. According to the spatial mapping, Central Thailand and its vicinity can be considered as the most threatened area of Thailand regarding extreme precipitation events.

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How to Cite
Beule, L., Lanhenke, J. .-F., & Tantanee, S. (2017). Trends in precipitation in Thailand from 1964 to 2012. Asia-Pacific Journal of Science and Technology, 21(4), APST–21. https://doi.org/10.14456/apst.2016.19
Issue
Vol. 21 No. 4 (2016): December
Section
Research Articles

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