Studi Pengaruh Kejadian Hujan Terhadap Banjir Lahar Di Sungai Gendol Menggunakan SIMLAR: Study Of The Effect Of Rain Incidence On Debris Flow In The Gendol River Using SIMLAR

Jazaul Ikhsan; Azqia Dara Adam; Ani Hairani

doi:10.33084/mits.v11i1.3975

Authors

Jazaul Ikhsan UMY
Azqia Dara Adam Universitas Muhammadiyah Yogyakarta
Ani Hairani Universitas Muhammadiyah Yogyakarta

DOI:

https://doi.org/10.33084/mits.v11i1.3975

Keywords:

Banjir lahar, intensitas hujan, pola hyetograf, SIMLAR

Abstract

Indonesia is a country with the largest number of active volcanoes in the world and has the potential to erupt. This causes primary and secondary disasters, one of which is secondary disasters caused by lava floods during heavy rains. So disaster mitigation is needed by simulating lava floods to find out the predictions of speed, volume, height and area affected by lava floods. The simulation was carried out using SIMLAR software, carried out on Gendol River which is one of the watersheds that has the threat of lahar flooding. The test was carried out with 3 hyetograph patterns and for each pattern there were 3 simulations with different rainfall intensities, namely 162 mm, 243 mm and 324 mm. From these tests, the speed values in patterns 1, 2 and 3 increased each simulation to the existing simulation. The speed value obtained by pattern 1 at 162 mm rain intensity is 2.35 m/s, at 243 mm rain intensity is 2.48 m/s, and at 324 mm rain intensity is 2.58 m/s. In addition, at high yields, volume and area also increase in each simulation due to the higher rainfall intensity. This proves that the intensity of rain is directly proportional to speed, volume, area and height. In addition, the hyetograph pattern also affects the peak hours when the maximum volume, maximum height and maximum speed are reached.

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Author Biographies

Azqia Dara Adam, Universitas Muhammadiyah Yogyakarta

Student of Master of Civil Engineering, Universitas Muhammadiyah Yogyakarta

Ani Hairani, Universitas Muhammadiyah Yogyakarta

Lecturer of Civil Engineering, Universitas Muhammadiyah Yogyakarta

References

Ardana, D. M. S., & Purwanto, T. H. (2013). Penentuan Jalur Evakuasi dan Tampak Banjir Lahar Dingin Gunung Merapi Magelang, Jawa Tengah. Jurnal Bumi Indonesia, 2(2), 149–154.
Armaya, D. A. B., & Hizbaron, D. R. (2015). Penaksiran Tingkat Kerentanan Sosial Terhadap Bahaya. Jurnal Bumi Indonesia, 4(4), 1–10.
Asmara, R. A., Prasetyo, A., Stevani, S., & Hapsari, R. I. (2021). Prediksi Banjir Lahar Dingin Pada Lereng Merapi Menggunakan Data Curah Hujan Dari Satelit. JIP (Jurnal Informatika Polinema), 7(2), 35–42.
Gunawan, G., Berperi, & Purnama, L. (2020). Analisis Debit Banjir Rancangan Sub DAS Air Bengkulu. Jurnal Ilmiah Rekayasa Sipil, 17(1), 1–9.
Hidayat, F., & Rudiarto, I. (2013). Pemodelan Resiko Banjir Lahar Hujan Pada Alur Kali Putih Kabupaten MAgelang. In Teknik PWK (Vol. 2, Issue 4).
Hidayat, R., Musthofa, A., & Bahri, P. (2017). Pengaruh Intensitas Hujan Terhadap Kecepatan dan Tinggi Banjir Lahar Berdasar Pemodelan SIMLAR 2.1. Jurnal Teknik Hidraulik, 8(1), 125–134.
Kholiq, M. A. (2017). Simulasi Aliran Banjir Lahar Pasca Erupsi Gunung Merapi 2010 Terhadap Keberadaan Sabo DAM di Sungai Gendol. Jurnal Teknisia, XXII(2).
Mulyono, D. (2014). Analisis Karakteristik Curah Hujan di Wilayah Kabupaten Garut Selatan. Jurnal Konstruksi, 13(1), 1–9.
Munir, Moh. D. (2019). Bangunan Sabo Dam, Fungsi dan Potensinya sebagai Pendukung Geowisata Gunung Merapi. Jurnal Lingkungan Dan Bencana Geologi, 10(2), 15–26.
Ramadhany, A. S., DS, A. N., & Subardjo, P. (2012). Daerah Rawan Genangan Rob di Wilayah Semarang. Journal Of Marine Research, 1(2), 174–180.
Rizal, M. A., & Hizbaron, D. R. (2015). Analisis Kerentanan Fisik Bahaya Banjir Lahar di Desa Sekitar Kali Putih Kabupaten Magelang. Jurnal Bumi Indonesia, 4(1), 175–184.
Sutapa, W. (2005). Kajian Hidrograf Satuan Sintetik Nakayasu Untuk Perhitungan Debit Banjir Rancangan di Daerah Aliran Sungai Kodina. MEKTEK, 7(1), 35–40.
Ulinnuha, I., Prasetyo, Y., & Sabri, L. (2020). Analisis Spasial Aliran Lahar Menggunakan HEC-HMS dan HEC-RAS Pada Kali Gendol-Opak Kawasan Gunung Merapi. Jurnal Geodesi Undip, 9(1), 20–28.