Long-term Changes in Characteristics of Daily Rainfall at Vientiane Municipal, Laos

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  • SUZUKI Kenji
    Japan International Research Center for Agricultural Sciences
  • YAMAMOTO Yukiyo
    Japan International Research Center for Agricultural Sciences
  • FURUYA Jun
    Japan International Research Center for Agricultural Sciences

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  • ラオス・ビエンチャン特別市における日降雨特性の経年変化
  • ラオス ビエンチャン トクベツシ ニ オケル ニチ コウウ トクセイ ノ ケイネン ヘンカ

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Abstract

In order to find the changes in rainfall characteristics and to examine the affect on rice production under rainfed conditions, a statistical analysis was carried out for 50 years daily rainfall record at Vientiane Municipal, Laos Meteorological Observatory. The rainfall recode was divided into two periods for each 25 years. Although total annual rainfalls have no trend, annual maximum daily rainfalls fluctuate and increase at the same probability year. Frequency of drought is increasing in the second period and more severe drought on September is increasing. On the contrary, in the first period heavy rainfalls causing flood such as over 100 mm/day are distributed intensively on August and September, although in the second period such rainfalls are also found from May to July.

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