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Journal : Agromet

Extreme Rainfall Analysis in the Bengawan Solo Watershed, Java Perdinan; Hapsari, Indri; Mudzakir Setiawan, Amsari
Agromet Vol. 38 No. 1 (2024): JUNE 2024
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/j.agromet.38.1.36-48

Abstract

As the largest watershed in Java Island, the Bengawan Solo watershed has experienced recurrent hydrometeorological hazards, leading to infra-structure damage, casualties, and environmental degradation. Research on extreme rainfall causing the hazards in the Bengawan Solo watershed is still limited. This study examines extreme rainfall events by analyzing daily rainfall data (1991-2020) at three observation stations namely Musuk, Tinap, and Lowayu, which represent the upstream, middle, and downstream of the Bengawan Solo watershed. The Extreme Value Theory (EVT) using the Block Maxima approach with a Generalized Extreme Value (GEV) method was used to determine the rainfall return period of 5, 10, 20, 30, and 50-year. We applied the Mann-Kendall test to assess the annual trends of extreme rainfall indices recommended by the Expert Team on Climate Change Detection and Indices (ETCCDI). The results found that the highest estimated annual maximum of daily rainfall was in Musuk station (226.7 mm), followed by Tinap station (159.3 mm) and Lowayu station (149.4 mm). While no significant trend was observed for Musuk, other stations showed a significant trend for the decrease of the daily rainfall intensity, the increase of the number of annual rainy days, the decrease of the annually maximum amount of five consecutive precipitation days, and the increase of the annually number of consecutive wet days. There is also an increase in the maximum amount of annual rainfall for one day (Rx1day) at Lowayu station, which indicates a higher risk of disaster due to high rainfall. Additionally, an increasing trend in the total annual rainfall (PRCPTOT) at Musuk, Tinap, and Lowayu stations suggests a greater potential for water storage to meet water needs in these areas.
Co-Authors Afifah, Nursita Agus Sarono, Agus Agus Siswanto Al Habshe, Azizah Amelia Santoso Anis Kusumawati Anjar Kusuma, Anjar Anjar Mahardian Kusuma Ardiya, Priyanka Arif Budiman Arlianto, Jerry Agus Atuzzaqiyah, Rifa Ayuningtyas, Aradewi Laksmi Az Zahra, Nursyifa Binar Asrining Dhiani Budiyanti, Nur Aini Bugis, Hairudin Cahyadewi, Amira Indriani Cahyadi, Yosvaldo Ongko Catur Siwi Handayani, Catur Siwi Dewi, Nurhandini Eka Didik Setiawan Dina Anggraeni, Dina Djoko Wahyono Dwi Hartanti Eko Pranoto Eliyanti, Uzma Emi Rahma Wulandari, Emi Rahma Faesol Amin, Faesol Faiza Chairan i Suwarno Galistiani , Githa Fungie Genatrika, Erza Githa Fungie Galistiani Guguh Sujatmiko Gunawan Gunawan hartanto hartanto Hasan Wattiheluw, Muhammad Havivah Nur Alam, Havivah Nur Heni Sumanti, Heni Hermanto Hermanto Husain, Herdiyanto Hutasoit, Diella Gracia Martauli Ika Yuni Astuti Iskandar Soedirman, Iskandar Iskandar Sudirman Iswadi, Hazrul Joniarto Parung Jurumai, La Pande Juwita Juwita Juwita, Juwita Kartikasari Kartikasari, Kartikasari Karuniawaty, Titi Pambudi Khairunnisa, Nadhira Hasna Kumalasari, Linda Dewi Kusniati, Putri La Pande Jurumai Lampasa, Yunitawati Linda Kurniawati, Linda Marjani Marjani MARJANI MARJANI, MARJANI Markus Hartono Marselius Sampe Tondok Mubarok Mubarok Mudzakir Setiawan, Amsari Mufidah, Laily Murini, Murini Nadhifa, Jihan Farah Nailul, Nur Nasrul Nasrul Nova Astrit Natalia, Nova Astrit Nurafiah Aswawi Nuraliyah Nuraliyah, Nuraliyah Nurhidayati, Friska Suci Nurmayanti, Rani Olyvia Novawanda P. Perdinan Paah, Nemuel Daniel Palupi, Fitria Dhenok Pradnyawati, Ni Kadek Sri Wahyuni Pratiwi, Yunita Eka Pudjiati, Sri Redatin Retno Puji Lestari Suharso Purwaningsih, Dini Ayu Putri, Hesti Nursari Putri, Irsalina Nurul Putu Aditya Wiguna Rahma Yuanita Caesar Rahmad Madjid Rayhanah, Salsabila Aurelia Riani Ahmad Risnajayanti, Risnajayanti Roslan, Astil Harli rosmawati, eva S Sriyadi S., Nursaban Rommy Sabaruddin Sondeng Sangadi, Kyana Salapani Santoso, Peter Sari, Linda Silvana Saril, Lenny Puspita Setyaningsih, Ike Budi Sudarso Sudarso Sulaksmana, Wayan Sandhi Susanti Susanti Susmiatun Susmiatun, Susmiatun SYAHRIAL SYAHRIAL Syifa Peresia, Syifa Tjahjoanggoro, Antonius Johanes Tri Dara Aprilya, Tri Dara Tyas, Rafi Setyoning Usman Usman Wahyu Utaminingrum Weningsari, Noridha zulaikha, yusni ulfiani _, Sustiawati