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All Journal DEVICE Jurnal Teknik Indonesia Jurnal Teknik Sipil
Risdiana Cholifatul Afifah
Universitas PGRI Semarang
Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Mechanical Engineering Transportation

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Pemetaan Genangan banjir di Wilayah Hilir Bendungan Randugunting dengan Model HEC-RAS 2 (Dua) Dimensi Risdiana Cholifatul Afifah; Farida Yudaningrum
Device Vol. 16 No. 1 (2026): Mei
Publisher : Fakultas Teknik dan Ilmu Komputer (FASTIKOM) UNSIQ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/device.v16i1.11091

Abstract

Bendungan Randugunting di Kabupaten Blora dibangun sebagai infrastruktur pengendali banjir, penyedia air baku, dan irigasi. Namun, pada beberapa kejadian banjir di hilir Sungai Banyuasin, wilayah Rembang, muncul persepsi bahwa operasional Bendungan Randugunting turut berkontribusi terhadap peningkatan debit banjir di daerah hilir. Penelitian ini diharapkan dapat memberikan klarifikasi ilmiah terhadap dugaan pengaruh Bendungan Randugunting terhadap banjir di hilir Sungai Banyuasin Rembang. Penelitian ini bertujuan untuk mengevaluasi kontribusi pelepasan air bendungan terhadap debit puncak banjir di Sungai Banyuasin. Metode yang digunakan meliputi analisis hidrologi dengan pemodelan menggunakan perangkat lunak Hydrologic Engineering Center–Hydrologic Modeling System (HEC-HMS), dan analisis hidrolika dengan bantuan model Hydrologic Engineering Center–River Analysis System (HEC-RAS) 2D untuk memodelkan genangan banjir. Hasil analisis pelepasan air Bendungan Randugunting, dapat disimpulkan bahwa waduk dapat menahan banjir di hulu, meredam sehingga rilis banjir cukup kecil dg kemampuan reduksi ±70% pada simulasi kala ulang 50th (outflow 63,4 m³/dt). Namun Kali Padas dengan luas Catchment area 2 (dua) kali luas DTA (Daerah Tangkapan Air) bendungan, menghasilkan pelepasan air sebesar 146 m3/dt. Melalui justifikasi teknis, banjir di daerah hilir waduk dipengaruhi oleh pelepasan air Kali Padas. Kondisi Kali Padas yang tanpa bangunan penahan banjir, diprediksi sebagai sumber limpasan terbesar penyebab banjir di pohlandak dan krikilan.
DISTRIBUSI SEDIMEN PADA WADUK JATIBARANG, KOTA SEMARANG Fitria Maya Lestari; Ratih Pujiastuti; Risdiana Cholifatul Afifah
Jurnal Teknik Indonesia Vol 5, No 2 (2024): JTI (Jurnal Teknik Indonesia)
Publisher : Universitas Darul Ulum Islamic Centre Sudirman GUPPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61689/jti.v5i2.662

Abstract

The main issue in the operation of reservoirs is sedimentation. This can lead to silting and affect the reservoir's storage capacity. The distribution of sediments needs to be understood in order to gain an overview of their spread, so that measures can be taken to address sediment-related issues in the Jatibarang Reservoir. The analysis was conducted using sediment data from previous studies, which reported a total sediment volume of 6.64 million m³ over a period of 50 years. Based on topographic data, it was found that the Jatibarang Reservoir is classified as Type III, with a "hill" classification. The analysis results showed that the dimensionless factor F is 0.22, with a relative depth p of 0.53. Based on the sediment distribution analysis of the Jatibarang Reservoir with Empirical Area Reduction Method, it was found that after 50 years of operation, the new zero elevation of the reservoir would be at an elevation of +126.82 m. In comparison with the low water surface elevation at the existing dead storage of the Jatibarang Reservoir, which is at +136 m, it can be concluded that the Jatibarang reservoir can operate according to the planned lifespan and can still function for more than 50 years
Analisis Kinerja Struktur Bangunan Gedung Laboratorium 5 Lantai Terhadap Gempa Kuat Lintang Enggartiasto; Agung Kristiawan; Ikhwanudin Ikhwanudin; Risdiana Cholifatul Afifah
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1186

Abstract

Abstrak Perencanaan ketahanan gempa untuk bangunan gedung sangat diperlukan sebagai konsekuensi kondisi geografi Negara Indonesia yang sebagian besar memiliki resiko gempa yang tinggi. Penelitian ini membahas kinerja struktur gedung laboratorium 5 lantai eksisting terhadap gempa kuat. Metode yang digunakan meliputi non-linier statik pushover dan non linier dinamik riwayat waktu (time history). Rekaman gempa yang digunakan digunakan adalah gempa kuat dengan percepatan spektrum 0.2 detik dengan rasio redaman 5% untuk periode 2500 tahun. Hasil analisis pushover level kinerja struktur saat performance point arah X termasuk kategori Immediate Occupancy dan arah Y termasuk kategori Damage Control dengan parameter sistem struktur hasil analisis non linier yang memenuhi syarat terhadap parameter desain SNI 1726-2019. Drift ratio terbesar pada analisis riwayat waktu menghasilkan level kinerja struktur dengan kategori Damage Control. Disimpulkan dengan kategori level kinerja struktur tersebut, saat terjadi gempa kuat (periode 2500 tahun) struktur akan mengalami kerusakan struktural yang ringan dan masih dapat diperbaiki untuk difungsikan kembali. Kata kunci: Desain berbasis kinerja, analisis non-linier, level kinerja struktur  Abstract Due to the geography of Indonesia, most of which has a high seismic risk, seismic design of buildings is necessary. This research discusses the structural performance of an existing 5-story laboratory building against strong earthquakes.  The methods used include nonlinear static pushover and nonlinear dynamic time history. The earthquake record used is a strong earthquake with an acceleration spectrum of 0.2 seconds and a damping ratio of 5% for a period of 2500 years. The results of the pushover analysis of the structural performance level at the performance point in the X-direction include the Immediate Occupancy category and in the Y-direction include the Damage Control category with the structural system parameters of the nonlinear analysis results that meet the requirements of the SNI 1726-2019 design parameters. The largest drift ratio in the time history analysis results in a structural performance level with the Damage Control category. It is concluded that with this category of structural performance level, during a strong earthquake (2500 year period), the structure will experience minor structural damage and can still be repaired to function. Keywords: Performance Based Design, Non-Linier Analysis, Structural Performance Level
Co-Authors Agung Kristiawan Fitria Maya Lestari Ikhwanudin Lintang Enggartiasto Ratih Pujiastuti Yudaningrum, Farida