Changes in Rainfall Characteristics at Huai Kog-Ma Watershed, Chiang Mai Province

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Sittichok Glomvinya
Chatchai Tantasirin
Piyapong Tongdeenok
Nobuaki Tanaka

Abstract

Rainfall characteristics in term of number of storms, number of rainy days, amount, duration, intensity and 30 minute maximum intensity were investigated from 3 tipping bucket automatic recording raingage located at Huai Kog-Ma Watershed, Chiang Mai Province during 1997-2013. Non-parametric and parametric test were employed to detect rainfall characteristics trends.


The results reveal that mean annual rainfall of Huai Kog-Ma Watershed during the study period was 1,736 mm, with 188 storms and 141 rainy days. Maximum mean monthly rainfall was found in August about 335 mm while minimum was occurred in February about 10 mm. The distribution of storm rainfall characteristics are positive skewness. Extreme rainfall characteristic including maximum in number of storms that rainfall over 50 mm, duration over 4 hour and 30 minute maximum intensity over 30 mm/hr was found in May. Analysis of rainfall characteristics trend showed that number of storms and number of rainy days are increased but not statistically significant. Number of storm which rainfall intensity higher than 50 mm/hr is increased significantly.

Article Details

How to Cite
Glomvinya, S., Tantasirin, C., Tongdeenok, P., & Tanaka, N. (2016). Changes in Rainfall Characteristics at Huai Kog-Ma Watershed, Chiang Mai Province. Thai Journal of Forestry, 35(2), 66–77. Retrieved from https://li01.tci-thaijo.org/index.php/tjf/article/view/247392
Section
Original Articles

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