ผลงานวิจัยปี 2560

The Influence of El Nino on Rainfall Distribution during Wet and Dry Seasons in Eastern Thailand

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ผู้แต่ง/ผู้ร่วมงาน

Prin Lorpittayakorn

คำสำคัญ

El Nino; Rainfall Distribution; Wet Seasons; Dry Seasons; Eastern of Thailand

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บทคัดย่อ

The aim of this research is to study the influence of El Nino on rainfall distribution during
wet and dry seasons in Eastern Thailand by using rainfall data in moderate periods during June
2003 - June 2004 and February 2013 - December 2013 and in El Nino periods during June 2002 -
March 2003, June 2009 - April 2010 and September 2014 - April 2016. During El Nino and moderate
periods, total rainfall data from May to October were used as data in wet season, and those from
November to December and from January to April were used as data in dry season. Stationary total
rainfall data in wet and dry seasons during moderate and El Nino periods were interpolated for
rainfall distribution over the entire study area by using Arc GIS 10.0 software. The rainfall distribution
during moderate period were classified into 5 classes (very low, low, median, high and very high
rainfalls) for wet and dry seasons based on standard deviation method. The difference between
rainfall during El Nino and moderate periods in wet and dry seasons were then investigated by using
overlay mapping technique and using statistical method (t-test) at 95 % confidence interval was
employed to assess the difference of rainfall distribution during wet and dry seasons in El Nino and
moderate periods. The results showed that in wet season, rainfall during El Nino period decreased
from moderate period at 0.05 significant level for all Eastern Thailand. On the other hand, in dry
season, rainfall during El Nino period decreased in Chanthaburi Province but increased in Sra Kaew,
Prachin Buri, Chachoengsao, Chonburi and Rayong Province at 0.05 significant level. Increasing
rainfall also occurred, but insignificant, in Trad Province during El Nino period. Thus, In Sra Kaew,
Prachinburi, Chachoengsao, Chonburi, Rayong and Trad province should storage water in dry season
for use in wet season of El Nino period and water diversion to Chanthaburi province in dry season
during El Nino period.

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