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SEBARAN KEKERINGAN HIDROLOGI BERDASARKAN DEBIT ALIRAN DI KABUPATEN BIMA I WAYAN YASA; AGUSTONO SETIAWAN; I DEWA GEDE JAYA NEGARA; HUMAIRO SAIDAH; ANNISA HUMAYRA DIRGANTARA
GANEC SWARA Vol 17, No 1 (2023): Maret 2023
Publisher : Universitas Mahasaraswati K. Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35327/gara.v17i1.371

Abstract

A phenomenon that often occurs in Indonesia which is also an annual disaster that hit several areas is drought. Drought is a condition in which an area, land, or community experiences a shortage of water so that it cannot meet their needs. Drought can be caused because an area does not experience rain or is dry for a long period of time or the rainfall is below normal, so that the water content in the soil is reduced or even non-existent. The areas to be analyzed are the Hidirasa watershed, the Rontu watershed, and the Jangka watershed in Bima Regency, West Nusa Tenggara. The analysis drought  aims to determine the deficit, drought duration, drought criteria based on deficits and surpluses that occur by analogy to Oldeman's criteria, hydrological drought index analysis, and hydrological drought distribution maps. In this study, data were used for the Tawali watershed in the Hidirasa watershed, the Sari watershed for the Jangka and the Kumbe water for the Rontu watershed to determine the Q50 and Q80 thresholds using the method Flow Duration Curve (FDC) to obtain hydrological drought characteristics. In the analysis of hydrological drought in several watersheds in Bima Regency, the results show that the maximum deficit in the Hidirasa, Term and Rontu watersheds was 1.09 m³/s, 0.14 m³/s, 0.49 m³/s which occurred in 2001, 1995, and 2001. From the deficit, it was found that the average drought period occurred 8-9 months from May to December and even some until January which indicated that the drought criteria were in zone 2 according to Oldeman. The largest hydrological drought index is the Hidirasa watershed, the Jangka Watershed and the Rontu watershed, respectively, -0.45, -1.00, -1.00, with a very strong drought category.
APLIKASI METODE RUN UNTUK PEMANTAUAN KEKERINGAN METEOROLOGIS DI KECAMATAN PUJUT KABUPATEN LOMBOK TENGAH HUMAIRO SAIDAH; AGUSTONO SETIAWAN; MUH. BAGUS BUDIANTO
GANEC SWARA Vol 18, No 2 (2024): Juni 2024
Publisher : Universitas Mahasaraswati K. Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35327/gara.v18i2.905

Abstract

Drought is a disaster frequently experienced in Pujut District, Central Lombok Regency. Almost every year, this area suffers from prolonged drought. This study was conducted to understand the characteristics of the droughts that occur, using a widely recognized drought assessment method as an effort to mitigate drought disasters in this region. The drought assessment used in this study is the Run method. This method was chosen due to its simplicity and the fact that it only requires rainfall data for its analysis. The results of the calculations for the depth and duration of the drought period are then compared with past droughts in the region and the natural phenomena that influenced them. The analysis using the Run method shows that the most severe and longest drought occurred at Pujut District from July 1997 to May 1998 (11 months) with a deficit of 800 mm from the average normal rainfall, and from 2014 to 2015 with a deficit of 553.54 mm. Both extreme droughts in 1997 and 2015 occurred in various regions of Indonesia and were related to the strong El Niño phenomenon occurred at that time