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2 results on '"Istiarto"'

1. Pola Operasi Waduk Wonogiri Setelah Pembangunan Pintu Pelimpah Baru Untuk Pengendalian Banjir

Author

Paska Wijayanti, Istiarto Istiarto, and Rachmad Jayadi

Subjects
closure dike, penelusuran banjir waduk, pengendalian banjir, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Waduk Wonogiri di Bengawan Solo hulu telah mengalami permasalahan sedimentasi yang mengganggu operasionalnya. Sebagian besar sedimen berasal dari DAS Keduang di sisi kanan (timur) waduk. Untuk mengatasi permasalahan tersebut, sebuah closure dike telah dibangun untuk melokalisasikan pasokan sedimen dari DAS Keduang. Closure dike membagi waduk menjadi waduk utama dan waduk tampungan sedimen, masing-masing memiliki pelimpah. Makalah ini menyajikan hasil kajian operasi Waduk Wonogiri dalam pengendalian banjir setelah pembangunan closure dike. Studi terdiri dari dua tahap. Tahap pertama adalah pemutakhiran banjir rancangan dengan menggunakan metode analisis frekuensi data hujan dan hidrograf satuan cara Collins. Tahap kedua adalah penelusuran banjir dengan menggunakan metode level pool routing. Penelusuran banjir dilakukan untuk dua kondisi, yaitu kondisi lama (elevasi muka air awal +135,3m) dan kondisi baru (elevasi muka air awal +136,3m). Pemutakhiran debit banjir menunjukkan adanya kenaikan debit banjir ke Waduk Wonogiri sebesar 7,7% dan 3,6%, masing-masing untuk debit banjir kala ulang 60 dan 500 tahun, dibandingkan dengan studi Pradipta (2014). Hasil kajian menunjukkan bahwa Waduk Wonogiri rentan terhadap overtopping saat banjir kala ulang 500 tahun. Untuk mengantisipasi risiko tersebut, maka elevasi muka air waduk untuk pembukaan-penuh pintu pelimpah baru disarankan untuk diturunkan agar muka air waduk maksimum tidak melebihi extra flood water level.

Published
2021
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2. INVESTIGASI PENYEBAB GENANGAN BANJIR DI KAWASAN AEROTROPOLIS YOGYAKARTA INTERNATIONAL AIRPORT

Author

Fadilah, Shofwatul, Istiarto, and Djoko Legono

Subjects
inundation, SEM-PLS, Drainage, flood, Aerotropolis
Abstract

The Yogyakarta International Airport (YIA) Aerotropolis area, Kulon Progo, is in an area prone to flooding. Some areas are flooded during the rainy season, including the Carik drainage channel that flows the discharge into the Bogowonto River on the west side and the Serang River on the side of east. This paper describes the results of the investigation of flood inundation that occurred in the drainage system of the YIA Aerotropolis area to determine the causes of flood inundation. The data were collected from literature studies, observations, interviews, and documentation at the study locations. Interviews were conducted using a questionnaire to the community around the drainage system of the study location. The data is then processed using the Structural Equation Modeling-Partial Least Square (SEM-PLS) method with SMART PLS 3.0 software. The investigation results show the inundation of floods in the Aerotropolis area of Yogyakarta International Airport caused by flood discharge from upstream, the influence of the Serang and Bogowonto Rivers, and the condition of the canals and buildings in the drainage system. Based on the Structural Equation Modeling-Partial Least Square (SEM-PLS) test results using SMART PLS 3.0, there is a positive effect from channel flow conditions and surface runoff to the flood inundation in the YIA Aerotropolis area. Based on the bootstrapping test, the t-test value was more than 1.96, while the p-test value showed a value of less than 0.05 for each factor causing flood inundation in the YIA Aerotropolis area.

Published
2023

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