Analisa Kekeringan Menggunakan Metode Theory of Run di DAS Krueng Aceh

Abstract

Drought is the lack of monthly precipitation compared to its monthly average. Drought analysis has not been done lately, especially outside Java Region. Drought analysis of drought severity indicated by drought intensity (mm/month) and duration of drought (month) along with repeated period of drought need to be done to support preparedness in facing drought disaster. The purpose of this study is to determine the duration and intensity of drought in the Krueng Aceh basin. The research stages are collecting monthly rainfall data from rainfall station in Krueng Aceh basin; filling the missing rainfall data by using the combination method (combination of Normal Ratio Method and Inversing Square Distance Method/Reciprocal Method); calculating drought intensity and duration using Theory of Run method. Krueng Aceh basin area is 1681.05 km2 covering 23 districts. The worst intensity of drought for the water needs of crops occurred in Seulimum rainfall station, which is 111.58 mm/month; while the worst water needs of rice is showed by the rainfall station in Indrapuri, which is 138.84 mm/month. The worst duration of drought for the water needs of crops occurred in Padang Tiji Rainfall Station with over 14 months; while the worst water needs of rice is showed by Blang Bintang Rainfall Station for 34 months. The maximum duration of the drought occurred in Lhoong Rainfall Station for 25 months in 2012-2014 and the maximum intensity of the drought is showed by Lhoong rainfall station is 247.5 mm/month in December 2008.

Keywords

• Drought
• theory of run
• drought intensity