Ratna, Intan Madya (2017) Drought Evaluation Using Standardized Precipitation Index (Spi) In Kalimanten Sub Watershed, Indonesia. Magister thesis, Universitas Brawijaya.
Abstract
Kekeringan merupakan fenomena alam yang telah terjadi pada skala regional sepanjang sejarah. Setiap tahun, Kabupaten Malang khususnya bagian selatan yang terletak pada daerah pesisir dengan perbukitan kapur selalu dilanda kekeringan. Badan Nasional Penanggulangan Bencana (BNPB) harus menyuplai 40.000 liter air bersih melalui truk tangki untuk memenuhi kebutuhan penduduk di wilayah terdampak kekeringan. Analisa kekeringan harus dilakukan untuk menghindari kerugian akibat fenomena kekeringan itu sendiri. Indeks kekeringan menghubungkan parameter iklim dengan fenomena kekeringan sederhana. Salah satu metode yang umum digunakan dalam menganalisa indeks kekeringan adalah Standardized Precipitation Index (SPI), dimana metode ini menggunakan data hujan sebagai input dari prosedur perhitungan. Karena kekeringan adalah salah satu bencana yang sangat dipengaruhi oleh perubahan iklim, analisa kekeringan juga mengkaitkan fenomena kekeringan dengan kejadian El Nino dan juga membandingkan kejadian kekeringan dengan ketersediaan air sungai pada wilayah studi. Hasil analisa SPI3 mengindikasikan bahwa dalam kurun waktu 25 tahun kejadian kekeringan terparah terjadi pada bulan Mei 1997 dimana seluruh stasiun mengalami status kekeringan “sangat kering”. Secara umum, kekeringan pada wilayah studi dikategorikan sebagai kekeringan sedang apabila ditinjau dari rata-ratanya, dengan rentangan besar indeks kekeringan mencapai -0.8 sampai dengan –1.12. Apabila dihubungkan dengan kejadian El- Nino, kategori kekeringan “sangat kering” selalu terjadi pada saat periode El.-Nino. Di sisi lain, keadaan debit sungai pada wilayah studi juga menunjukkan keterkaitan dengan kejadian kekeringan. Ketika debit tinggi maka pada saat yang sama SPI3 menunjukkan nilai positif yang berarti tidak terjadi kekeringan, maupun sebaliknya. Rancangan kala ulang kekeringan juga dianalisa pada studi ini. Kala ulang untuk durasi dan besar kekeringan di desain mengikuti sebaran distribusi Gumbel.
English Abstract
Drought is a natural phenomenon that has been recurring at a regional scale throughout history. Every year, in Malang District especially the southern part which is located on the coastal areas with limestone hills are experiencing drought. The National Disaster Management Agency of Indonesia (BNPB) must supply 40.000 liters of clean water through tank trucks to meet the water needs of communities in the drought-affected areas. Drought analysis must be performed to avoid all losses due to drought phenomenon. The drought index links the climatic parameters associated with simple drought phenomena. One of the commonly used method of calculating the drought index is the Standardized Precipitation Index (SPI), which in that method uses rainfall data as input of the calculation procedure. Since drought is one of the disasters most affected by climate change, drought analysis also done by linking drought and El-Nino incidence and also comparing the drought events with the availability of water in the river in the study area. Result of the analysis of SPI3 indicate that for drought index factor with extremely dry category that shows temporally for 25 years, May 1997 is the month where all rainfall stations experienced extremely dry condition of drought. Generally, drought in study area categorized as moderate drought when analyzed from average drought intensity that ranged between -0.8 to -1.12. When associated with the incident of El Nino for all parameters, severe drought events always occurred during El Nino period. In other hand, runoff conditions in the study area also shows its association with drought events. When run off value is high then at that time SPI3 value shows a positive value, which means no drought. Otherwise, when the run off value is very small or close to zero then the SPI3 value also shows a negative value which means there is an indication of drought at the same time in the region. Design of return period of drought also have been analyze. Return periods design of drought duration and drought magnitude for other year intervals will increase following the Gumbel Distribution.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/551.577 3/RAT/d/2017/041710804 |
| Uncontrolled Keywords: | DROUGHTS, PRECIPITATION (meteorology), WATERSHEDS, MANAGEMENT |
| Subjects: | 500 Natural sciences and mathematics > 551 Geology, hydrology, meteorology > 551.5 Meteorology > 551.57 Hydrometeorology > 551.577 Precipitation |
| Divisions: | S2/S3 > Magister Teknik Sipil, Fakultas Teknik |
| Depositing User: | Nur Cholis |
| Date Deposited: | 11 May 2018 07:42 |
| Last Modified: | 26 Nov 2021 06:04 |
| URI: | http://repository.ub.ac.id/id/eprint/10405 |
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03.ACKNOWLEDGEMENT.pdf Download (15kB) | Preview |
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05.LIST OF TABLES.pdf Download (15kB) | Preview |
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04.TABLE OF CONTENTS.pdf Download (17kB) | Preview |
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06.LIST OF FIGURES.pdf Download (16kB) | Preview |
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08.CHAPTER II LITERATURE REVIEW.pdf Download (67kB) | Preview |
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07.CHAPTER I INTRODUCTION.pdf Download (29kB) | Preview |
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09.CHAPTER III METHODOLOGY.pdf Download (123kB) | Preview |
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10.CHAPTER IV RESULT AND DISCUSSION.pdf Download (534kB) | Preview |
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11.CHAPTER V CONCLUSION.pdf Download (20kB) | Preview |
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DAFTAR PUSTAKA.pdf Download (20kB) | Preview |
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THESIS-INTAN MADYA RATNA-146060112011002.pdf Download (724kB) | Preview |
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BAGIAN DEPAN.pdf Download (788kB) | Preview |
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00.IDENTITAS PENGUJI.pdf Download (14kB) | Preview |
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00.Lembar Orisinalitas.pdf Download (363kB) | Preview |
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00.Lembar Pengesahan.pdf Download (359kB) | Preview |
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00.RIWAYAT HIDUP.pdf Download (14kB) | Preview |
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01.COVER.pdf Download (24kB) | Preview |
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02.ABSTRACT-ENGLISH.pdf Download (17kB) | Preview |
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02.ABSTRAK-INDONESIA.pdf Download (18kB) | Preview |
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