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« Volume 9 Nomor 1 Januari 2011

Pengaruh Perubahan Cuaca Global Terhadap Data Hidrologi Di Indonesia

Syofyan Dt.Majo Kayo
Indonesia which consists of thousands of large and small islands is situated in a region with tropical climate and 2 (two) seasons, the rainy and dry season. In some areas with high rainfall, floods are common phenomena, whereas in the dry season when rainfall is low, there is often a shortage of water or severe drought.
In North Sulawesi, rains generally appear in October until March, with monthly rainfall from 885 to 3883 mm, whereas in the dry season, usually from April to September, rainfall constitutes 41 to 1186 mm.
Results of study and analysis of Hydrologic data indicate that in reality, change and difference of intensity and pattern, or climatologic, rainfall and fluctuation of data distribution can be shown by the discharge level at some hydrological observation posts
Climatologic data (daily mean temperature) in the period 1975 - 1990 constitutes 33.4o C, and from 1990 to 1995, 31.1o C. This significant difference is shown by the daily mean temperature that equals 2.3o C.
Monthly rainfall data in the period 1995 - 2000 had reached 749 mm, in 2000 – 2005, 885 mm and a high annual rainfall in 1995 – 2000, namely 1185 mm, and 3883 mm from 2000 to 2005.
Hydrometric data or occurrence of flood peak from 1995 to 2000 constitutes 162.5 m3/s and, in the period 2000 – 2005, 33.5 m3/s.
The difference of above hydrologic data is represented by the hypothesis of various factors, among others, the influence of global climate change which is felt throughout the world.

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