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Retno Utami Agung Wiyono
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Jember
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Immunology & microbiology Mathematics Physics Social Sciences Transportation

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Assessment of Drought Hazard: A Case Study in Sampean Baru Watershed, Bondowoso Regency Putra, Victorius Setiaji; Halik, Gusfan; Agung Wiyono, Retno Utami
Jurnal Teknik Sipil dan Perencanaan Vol 23, No 1 (2021): Jurnal Teknik Sipil dan Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v23i1.28177

Abstract

Abstract. The Sampean Baru watershed is categorized as an area with a very high level of vulnerability to drought. The purpose of this study was to assess the hydrological drought in the Sampean Baru watershed. NCEP / NCAR Reanalysis climate change data is used to obtain synthetic rainfall models of the past. This climate change data has crude resolution and is global in scale. The NCEP / NCAR Reanalysis data was processed through a downscaling process to obtain local scale climate data in the form of past synthetic rains. Artificial Neural Network (ANN) is one of the downscaling models used in this study. The ANN downscaling output was processed through discharge modeling using SWAT. Hydrological drought assessment used the Standardized Precipitation Index (SRI) method. The SRI calculation was based on the accumulated discharge over a period of time. The results indicated that the ANN downscaling process can bridge global scale climate data to local scale climate data. SWAT modeling gave excellent results. SRI-6 can describe past droughts. It can be seen from the compatibility between the results of the drought assessment and the drought data belonging to the relevant authorities.
Assessment of Drought Hazard: A Case Study in Sampean Baru Watershed, Bondowoso Regency Putra, Victorius Setiaji; Halik, Gusfan; Agung Wiyono, Retno Utami
Jurnal Teknik Sipil dan Perencanaan Vol 23, No 1 (2021): Jurnal Teknik Sipil dan Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v23i1.28177

Abstract

Abstract. The Sampean Baru watershed is categorized as an area with a very high level of vulnerability to drought. The purpose of this study was to assess the hydrological drought in the Sampean Baru watershed. NCEP / NCAR Reanalysis climate change data is used to obtain synthetic rainfall models of the past. This climate change data has crude resolution and is global in scale. The NCEP / NCAR Reanalysis data was processed through a downscaling process to obtain local scale climate data in the form of past synthetic rains. Artificial Neural Network (ANN) is one of the downscaling models used in this study. The ANN downscaling output was processed through discharge modeling using SWAT. Hydrological drought assessment used the Standardized Precipitation Index (SRI) method. The SRI calculation was based on the accumulated discharge over a period of time. The results indicated that the ANN downscaling process can bridge global scale climate data to local scale climate data. SWAT modeling gave excellent results. SRI-6 can describe past droughts. It can be seen from the compatibility between the results of the drought assessment and the drought data belonging to the relevant authorities.
PERBANDINGAN SISTEM RAINWATER HARVESTING DI KOTA DAN DESA SEBAGAI ALTERNATIF MENGATASI KEKERINGAN (STUDI KASUS DESA KRAJAN TIMUR DAN DESA PANDUMAN, KAB. JEMBER) Retno Utami Agung Wiyono; Entin Hidayah; Fahir Hassan; Fista Pebriyanti; Alfiati Ningsih
TERAS JURNAL Vol 11, No 1 (2021): Maret 2021
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v11i1.420

Abstract

Abstrak Air adalah sumber daya yang terus dibutuhkan manusia. Dengan menggunakan sistem Rainwater Harvesting RWH), air hujan dapat dimanfaatkan untuk memenuhi kebutuhan domestik. Penelitian ini tidak hanya membahas potensi air yang dapat dimanfaatkan dari sistem RWH yang ada pada satu lokasi saja, akan tetapi mempertimbangkan dua lokasi yang merupakan lokasi yang lebih padat penduduk dan dikategorikan sebagai wilayah kota (Desa Krajan Timur, Sumbersari) dan lokasi yang lebih jarang penduduknya dan dikategorikan sebagai wilayah desa (Desa Panduman, Jelbuk). Dalam penelitian ini digunakan beberapa data yaitu peta lokasi, data curah hujan, dan data kebutuhan air penduduk. Untuk mengetahui kebutuhan air dan sumber air yang digunakan penduduk sehari-hari, dilakukan survey kepada masyarakat yaitu 20 rumah di wilayah kota dan 20 rumah di wilayah desa. Perhitungan potensi air dari sistem RWH dilakukan dengan metode F. J. Mock menggunakan debit andalan 50%. Dari studi ini diperoleh hasil bahwa pada 20 rumah di wilayah kota, sistem RWH berpotensi menghasilkan air sejumlah 3,168 liter/bulan sampai 31,825 liter/bulan. Adapun pada 20 rumah di wilayah desa, potensi air dari sistem RWH pada setiap rumah berkisar antara 15,090 liter/bulan sampai 33,952 liter/bulan. Potensi air tersebut dapat memenuhi seluruh kebutuhan air pada 20 rumah di desa dan 17 rumah di kota, serta dapat memenuhi 44% sampai 72% kebutuhan air pada 3 rumah di wilayah kota. Kata kunci: Rainwater harvesting, kebutuhan air, kesetimbangan air, kota, desa  Abstract Water has always become a vital resource that is needed by a human being. Rainwater may play an essential role as a domestic water supply by rainwater harvesting system. This study compares potential rainwater harvested at two locations considered an urban area with higher population density and a rural area with lower population density. The studied urban area and rural area are Desa Krajan Timur, Sumbersari and Desa Panduman, Jelbuk, respectively. Several data utilized in this study are location maps, precipitation data, and water needs data. Surveys are conducted by interviewing twenty residences in each urban and rural area to obtain water needs and water sources data. Water harvested potential was calculated using F J Mock method. The study results showed that rainwater harvesting system in 20 houses in the urban area could produce 3,168 liters/month until 31,825 liters/month of water. While the rainwater harvesting system in 20 houses in the rural area could produce 15,090 liters/month until 33,952 liters/month of water. The harvested water could fulfill all water needs in 20 houses in the rural area, 17 houses in the urban area, and 44% until 72% of water needs in 3 houses in the urban area. Keywords: Rainwater harvesting, water needs, water balance, urban area, rural area
ANALISIS KEKERINGAN METEOROLOGI MENGGUNAKAN METODE STANDARDIZED PRECIPTATION INDEX (SPI) DI DAS BEDADUNG KABUPATEN JEMBER Citra Malini; Gusfan Halik; Retno Utami Agung Wiyono
TERAS JURNAL Vol 11, No 2 (2021): Volume 11 Nomor 2, September 2021
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v11i2.483

Abstract

Abstrak Bencana kekeringan di DAS Bedadung terindikasi dengan tidak terpenuhinya kebutuhan masyarakat akan pasokan air. Kekurangan air akibat defisit curah hujan menjadi indikator kekeringan meteorologi. Penelitian ini bertujuan untuk mendapatkan nilai indeks kekeringan di DAS Bedadung kabupaten Jember. Metode Standardized Precipitation Index (SPI) digunakan untuk mendapatkan tingkat kekeringan. Tingkat kekeringan meteorologi yang dihitung tergantung jumlah curah hujan yang terukur pada alat penakar di stasiun. Hasil penelitian ini menunjukkan bahwa indeks kekeringan ekstrim terjadi pada tahun 2018 dan 2019. Nilai indeks kekeringan (SPI-6) memiliki nilai tertinggi sebesar -2,69 di stasiun Ajung dan nilai     -1,13 di stasiun Kottok. Hasil pemetaan sebaran indeks kekeringan memiliki kesesuaian dengan kondisi kekeringan observasi. Hal ini ditunjukkan dari nilai validasi sebaran kekeringan antara SPI-6 dan data kekeringan observasi dengan tingkat keandalan sebesar 82%. Kata kunci: DAS Bedadung, bencana kekeringan, indeks kekeringan meteorologi, SPI   Abstract Drought disaster in the Bedadung watershed is indicated by the unfulfilled sociaty needs for water supply. Lack of water due to deficit in rainfall is an indicator of meteorological drought. This study aims to obtain the drought index value in the Bedadung watershed, Jember district. The Standardized Precipitation Index (SPI) method is used to obtain the drought saverity index. The meteorological drought index depends on the amount of rainfall observed on the rainfall gauge stations. The results of this study indicated that extreme drought index occurred in 2019. The drought index value (SPI-6) had the highest value of -2.69 at the Ajung station and a value of   -1.13 at the Kottok station. The results of the mapping of the distribution of the drought index are suitable with drought existing conditions. This is indicated by the validation value of the drought distribution between SPI-6 and the observed drought data with a reliability level of 82%. Keywords: Bedadung watershed, drought disaster, meteorological drought index, SPI
STUDI PERAMALAN PASANG SURUT DI PESISIR PANTAI PANCER KECAMATAN PUGER, KABUPATEN JEMBER Nur Alif Ryanto; Retno Utami Agung Wiyono; Entin Hidayah
Maspari Journal : Marine Science Research Vol 14, No 1 (2022)
Publisher : UNIVERSITAS SRIWIJAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/maspari.v14i1.13653

Abstract

Salah satu data yang dibutuhkan untuk perencanaan pengembangan fasilitas pendukung bangunan pantai yaitu data ramalan pasang surut dan informasi karakteristik kondisi pasang surut yang berguna untuk perencanaan pengelolaan kekayaan laut yang mendukung aktivitas masyarakat pesisir. Data pasang surut dalam perencanaan pengembangan bangunan pantai digunakan sebagai acuan penentuan elevasi tinggi lantai bangunan yang direncanakan agar tidak mempengaruhi bangunan pantai. Penelitian ini bertujuan untuk mendapatkan karakteristik tipe pasang surut menggunakan metode Admiralty, membaca kesesuaian data pasang surut dengan mencari nilai RMSE antara data observasi lapangan dengan peramalan menggunakan program NAO Tide dan Badan Informasi Geospasial (BIG) serta meramalkan pasang surut menggunakan program NAO Tide untuk mengetahui kedudukan elevasi muka air laut selama 3 tahun ke depan di Pesisir Pantai Pancer, Kecamatan Puger, Kabupaten Jember. Data yang digunakan dalam penelitian ini adalah data koordinat lokasi penelitian dan data pengamatan pasang surut di lapangan selama 15 hari pada tanggal 03 Oktober - 17 Oktober 2019.  Hasil penelitian menggunakan metode Admiralty menunjukkan karakteristik kondisi tipe pasang surut di Pesisir Pantai Pancer, Kecamatan Puger, Kabupaten Jember merupakan tipe pasang surut campuran condong harian ganda dengan nilai Formzahl 0,3 serta fluktuasi pasang surut MSL sebesar 143 cm, HHWL sebesar 278 cm dan LLWL sebesar 9 cm. Peramalan pasang surut menggunakan NAO Tide memperoleh nilai RMSE sebesar 11,55% sedangkan peramalan menggunakan BIG memperoleh nilai RMSE sebesar 12,64%. Berdasarkan peramalan pasang surut selama 3 tahun (November 2019 – Desember 2022) menggunakan program NAO Tide menunjukkan nilai HHWL tertinggi sebesar 305 cm pada bulan Februari 2021 dan LLWL terendah sebesar 4 cm pada bulan April 2020. Sedangkan hasil peramalan BIG menunjukkan nilai HHWL tertinggi sebesar 304 cm pada bulan November 2020 dan LLWL terendah sebesar 6 cm pada bulan Juli dan Agustus 2020.
Study of Rainfall and Water Discharge Spatial Variability Using Exploratory Spatial Data Analysis Method in Bondowoso Regency Vide Mirza Faillasuf; Gusfan Halik; Retno Utami Agung Wiyono
BERKALA SAINSTEK Vol 9 No 1 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i1.16179

Abstract

The difference in rainfall intensity affects the hydrological cycle as a process that greatly determines the amount of water discharge. Thus, in water resources management, it is important to determine the distribution pattern of rainfall and discharge. By studying the characteristics of rainfall distribution patterns and water discharge, the potential of water resources can be illustrated well. This study uses the Exploratory Spatial Data Analysis method to examine spatial variability of rainfall intensity and water discharge in Bondowoso Regency. Rainfall and discharge data are collected from 35 rain stations and 227 weirs in 2008 until 2018. This study produces monthly average rainfall distribution values between 190 mm / month with monthly average discharge between 7300lt/sec/month. Meanwhile, the obtained average annual rainfall distribution values are between 2300 mm/year with annual average discharge values between 105000 lt/sec/month. The spatial distribution map using IDW method produces information on the potential of water resources as follow: the higher the height of a place, the higher the average monthly rainfall, while the lower the height of a place, the higher the average monthly discharge. As for the obtained correlation value between rainfall and discharge is R² = 0.665.
The Assessment of Climate Change Impact on Meteorological Draught Susceptability on Sampean Watershed Masita Ratih; Gusfan Halik; Retno Utami Agung Wiyono
BERKALA SAINSTEK Vol 9 No 4 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i4.25065

Abstract

Drought disasters that occur in the Sampean watershed from time to time have increased, both the intensity of events and the area affected by drought. The general objective of this research is to develop an assessment method for the impact of climate chan ge on vulnerability to drought disasters based on atmospheric circulation data. The specific objectives of this study are to model rainfall predictions based on atmospheric circulation data, predict rainfall in various climate change scenarios (Intergovernm ental Panel on Climate Change, IPCC – AR5), and assess vulnerability to drought disasters using a meteorological approach. The Standardized Precipitation Index (SPI) is one way to analyze the drought index in an area which was developed previous researcher. The Standardized Precipitation Index (SPI) is designed to quantitatively determine the rainfall deficit with various time scales. The advantage of the Standardized Precipitation Index (SPI) is that it is enough to use monthly rainfall data to compare drou ght levels between regions even with different climate types. To facilitate the presentation of the data base on the identification of d rought susceptibility, we need a system that can assist in building, storing, managing and displaying geographically ref erenced information in the form of spatial mapping. This research facilitates monitoring of the area of drought-prone areas, predicts drought levels, prevents future drought disasters, and prepares plans for rebuilding drought-prone areas in the Sampean watershed.
Prediksi Laju Sedimentasi Pada Sungai Jatiroto Hajar Crisia Cahyani; Entin Hidayah; Retno Utami Agung Wiyono; Gusfan Halik; Wiwik Yunarni Widiarti
Jurnal Rekayasa Sipil (JRS-Unand) Vol 17, No 1 (2021)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.17.1.64-71.2021

Abstract

Erosi dapat menyebabkan terjadinya sedimentasi di sungai. Sedimentasi yang terjadi secara terus-menerus dapat mengakibatkan sungai menjadi dangkal dan mengurangi kapasitas sungai. Sedimen akan mengendap pada bagian tertentu di sepanjang aliran sungai yang tidak mampu terangkut bersama dengan aliran sungai. Sungai Jatiroto merupakan sungai yang membatasi Kabupaten Lumajang dan Kabupaten Jember. Sungai Jatiroto dimanfaatkan untuk keperluan irigasi pada kecamatan Jatiroto dan Kecamatan Rowokangkung. Penyebab dari sedimentasi adalah perubahan tata guna lahan ataupun erosi yang dilakukan oleh sungai itu sendiri. Pemodelan transpor sedimen oleh HEC-RAS bertujuan untuk mengetahui laju sedimen yang terbawa oleh sungai. Pada pemodelan ini dilakukan dua analisis, yaitu analisis hidrolika dan analisis transpor sedimen. Tahap pertama, analisis hidrolika menggunakan debit unsteady, parameter Manning (n) dan koefisien ekspansi dan kontraksi. Kalibrasi model dilakukan dengan cara perbandingan tinggi muka air yang menghasilkan nilai determinasi R2 sebesar 0,9586, nilai RMSE sebesar 0,39 dan masuk dalam kategori baik. Tahap kedua, analisis sedimentasi menggunakan debit quasi-unsteady dan diameter butiran. Fungsi pengangukatan sedimen yang cocok pada pemodelan ini adalah Laursen (Field) dengan laju sedimen sebesar 256,341 m³/tahun. Adapun laju sedimentasi di lapangan dilakukan dengan membandingkan cross section lama dengan yang baru yaitu 289,24  m³/tahun. Uji keandalan (validasi) model dilakukan dengan membandingkan hasil pemodelan dengan data observasi yang didapatkan dari hasil perhitungan volume pengendapan pada cross section. Didapatkan hasil uji keandalan sebesar 88%.
EVALUASI KINERJA SUB DAS ASEM KABUPATEN LUMAJANG Windy Bana Alam Perkasa; Gusfan Halik; Retno Utami Agung Wiyono
Jurnal Riset Rekayasa Sipil Vol 5, No 2 (2022): Maret 2022
Publisher : Civil Engineering Study Program, Engineering Faculty Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (797.114 KB) | DOI: 10.20961/jrrs.v5i2.58139

Abstract

Sub daerah aliran sungai (Sub DAS) adalah satu kesatuan ekosistem yang terdiri dari sumber daya alam dan manusia yang kompleks. Sub DAS berperan sebagai daerah tangkapan hujan yang dalam perkembangan tidak bisa lepas dari segala bentuk tindakan yang dilakukan manusia. Pada Sub DAS Asem, seringkali terjadi masalah akibat tingkat perubahan cuaca yang tidak menentu, serta perubahan tata guna lahan yang ada, mengakibatkan meningkatnya debit air sungai hingga merusak infrastruktur yang ada, oleh karena itu diperlukan evaluasi penilaian dari semua kriteria secara lengkap merujuk pada Peraturan Menteri Kehutanan Republik Indonesia tentang Monitoring dan Evaluasi Daerah Aliran Sungai tahun 2014 mencakup evaluasi kondisi lahan, tata air, sosial ekonomi, investasi bangunan air dan pemanfaatan ruangan wilayah. Hasil dari penelitian ini menunjukkan bahwa nilai kinerja Sub DAS Asem pada tahun 2009 sebesar 86,50 termasuk dalam kondisi baik. Kemudian nilai kinerja Sub DAS Asem pada tahun 2019 meningkat sedikit sebesar 88,75 namun masih termasuk dalam kondisi baik. Sehingga secara keseluruhan daya dukung Sub DAS Asem dalam kondisi baik.
Flood Vulnerability Assessment of Kali Welang Floodplain by Using AHP-Based Methods Ageng Dwi Wicaksono; Entin Hidayah; Retno Utami Agung Wiyono
U Karst Vol 5, No 1 (2021): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3152.051 KB) | DOI: 10.30737/ukarst.v5i1.1370

Abstract

Floods occur almost every year in a number of areas in the floodplain of Kali Welang. The floods have caused loss of materials and lives. Assessment of the vulnerability is essential for policy making in non-structural treatment of floods.  The objective of this paper is to compute and elaborate the flood vulnerability index in local scale to assess conditions that affect the magnitude of flood hazards.  This study identifies and evaluates the Flood Vulnerability Index (FVI) of an area by considering the factors of area’s exposure to floods, flood susceptibility, and flood resilience. The Analytic Hierarchy Process (AHP) is used to formulate the weights of each component. The values of the components were collected from interviews with policy makers from relevant governmental agencies. The inputs for the AHP were collected from the respondents in a questionnaire survey. This study selected 18 relevant indicators. The FVI results show very high vulnerability in local scale in one village and high vulnerability in other six villages. The results of this study can be used to construct non-structural strategies in flood mitigation by enhancing community’s resilience toward the flood. In addition, the results can be used for policy making process in spatial urban planning.
Co-Authors Abdur Rohman Adden Ramadhan Syarif Ardi Ageng Dwi Wicaksono Aldio Dhiva Pratama Alfiati Ningsih Citra Malini Entin Hidayah Fahir Hassan Fista Pebriyanti Gusfan Halik Hajar Crisia Cahyani Hery Budi Sulaksono Indra Nurtjahjaningtyas Joseph Dwi Kurniawan Manno Masita Ratih Meta Fitri Rizkiana Nur Alif Ryanto Putra, Victorius Setiaji Risqi Sofiana Sabda Alam Akbar Suparno Suparno Vide Mirza Faillasuf Wei Koon Lee Windy Bana Alam Perkasa Wiwik Yunarni Widiarti