• International Journal of Technology (IJTech)
  • Vol 7, No 7 (2016)

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

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

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Published at : 29 Dec 2016
Volume : IJtech Vol 7, No 7 (2016)
DOI : https://doi.org/10.14716/ijtech.v7i7.4709

Cite this article as:
Piman, T., Pawattana, C., Vansarochana, A., Aekakkararungroj, A., Hormwichian, R., 2016. Analysis of Historical Changes in Rainfall in Huai Luang Watershed, Thailand. International Journal of Technology, Volume 7(7), pp. 1155-1162

Thanapon Piman Stockholm Environment Institute, Asia Centre, Bangkok, 10330, Thailand
Chalermchai Pawattana Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand
Anujit Vansarochana Department of Natural Resources & Environment, Faculty of Agriculture Natural Resources and Environment, Naresuan University, 65000, Thailand
Aekkapol Aekakkararungroj SERVIR-Mekong, USAID-NASA partnership, Asian Disaster Preparedness Center, Bangkok, 10400, Thailand
Rattana Hormwichian Department of Civil Engineering, Faculty of Engineering, Mahasarakham University, Mahasarakham 44150, Thailand
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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.

Climate change; Extreme rainfall; Frequency analysis; Mekong; Trends