Vol 7, No 7 (2016) > Civil Engineering >

Analysis of Historical Changes in Rainfall in Huai Luang Watershed, Thailand

Thanapon Piman, Chalermchai Pawattana, Anujit Vansarochana, Aekkapol Aekakkararungroj, Rattana Hormwichian


Abstract: This
study aims to investigate changes in rainfall in terms of trends, variability,
spatial and temporal distributions, and extremes in the Huai Luang watershed.
The trend analysis was applied to the time series of rainfall data for 32 years
from 1982-2013. Changes in spatial and temporal rainfall distributions and
extremes were investigated by comparing the 2 periods of the rainfall data
between 1982-1997 and 1998-2013. Frequency analysis of annual maximum daily rainfall
was applied to determine changes in extreme rainfall for different return
periods at three stations located upstream, middle and downstream of the
watershed. The results of this work show significantly increasing trends in
annual rainfall, spatial variations and extreme daily rainfall in the Huai
Luang watershed. The extreme rainfall resulted in increasing floods in last
decade. Spatial and temporal rainfall distributions are also changing. The
lower part of the watershed will have more rain. Further studies on potential
impacts of rainfall changes on flood risk, water resources management,
urbanization and agriculture development in the Huai Luang watershed are
recommended to support preparation of adaptation strategies for mitigating
potential negative impacts.
Keywords: Climate change; Extreme rainfall; Frequency analysis; Mekong; Trends

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