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<![CDATA[Assessment of Drought Hazard: A Case Study in Sampean Baru Watershed, Bondowoso Regency ]]>
<![CDATA[Putra, Victorius Setiaji]]>;
<![CDATA[Halik, Gusfan]]>;
<![CDATA[Agung Wiyono, Retno Utami]]>
<![CDATA[ Jurnal Teknik Sipil dan Perencanaan Vol 23, No 1 (2021): Jurnal Teknik Sipil dan Perencanaan ]]>
Publisher : <![CDATA[Semarang State University ]]>
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DOI: 10.15294/jtsp.v23i1.28177
<![CDATA[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.]]>
<![CDATA[Assessment of Drought Hazard: A Case Study in Sampean Baru Watershed, Bondowoso Regency ]]>
<![CDATA[Putra, Victorius Setiaji]]>;
<![CDATA[Halik, Gusfan]]>;
<![CDATA[Agung Wiyono, Retno Utami]]>
<![CDATA[ Jurnal Teknik Sipil dan Perencanaan Vol 23, No 1 (2021) ]]>
Publisher : <![CDATA[Universitas Negeri Semarang ]]>
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DOI: 10.15294/jtsp.v23i1.28177
<![CDATA[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.]]>
<![CDATA[STUDI PERAMALAN PASANG SURUT DI PESISIR PANTAI PANCER KECAMATAN PUGER, KABUPATEN JEMBER ]]>
<![CDATA[Nur Alif Ryanto]]>;
<![CDATA[Retno Utami Agung Wiyono]]>;
<![CDATA[Entin Hidayah]]>
<![CDATA[ Maspari Journal : Marine Science Research Vol 14, No 1 (2022) ]]>
Publisher : <![CDATA[UNIVERSITAS SRIWIJAYA ]]>
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DOI: 10.36706/maspari.v14i1.13653
<![CDATA[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.]]>
<![CDATA[Prediksi Laju Sedimentasi Pada Sungai Jatiroto ]]>
<![CDATA[Hajar Crisia Cahyani]]>;
<![CDATA[Entin Hidayah]]>;
<![CDATA[Retno Utami Agung Wiyono]]>;
<![CDATA[Gusfan Halik]]>;
<![CDATA[Wiwik Yunarni Widiarti]]>
<![CDATA[ Jurnal Rekayasa Sipil (JRS-Unand) Vol 17, No 1 (2021) ]]>
Publisher : <![CDATA[Civil Engineering Departement, Andalas University ]]>
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DOI: 10.25077/jrs.17.1.64-71.2021
<![CDATA[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%.]]>
<![CDATA[EVALUASI KINERJA SUB DAS ASEM KABUPATEN LUMAJANG ]]>
<![CDATA[Windy Bana Alam Perkasa]]>;
<![CDATA[Gusfan Halik]]>;
<![CDATA[Retno Utami Agung Wiyono]]>
<![CDATA[ Jurnal Riset Rekayasa Sipil Vol 5, No 2 (2022): Maret 2022 ]]>
Publisher : <![CDATA[Civil Engineering Study Program, Engineering Faculty Universitas Sebelas Maret ]]>
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DOI: 10.20961/jrrs.v5i2.58139
<![CDATA[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.]]>
<![CDATA[Flood Vulnerability Assessment of Kali Welang Floodplain by Using AHP-Based Methods ]]>
<![CDATA[Ageng Dwi Wicaksono]]>;
<![CDATA[Entin Hidayah]]>;
<![CDATA[Retno Utami Agung Wiyono]]>
<![CDATA[ U Karst Vol 5, No 1 (2021): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v5i1.1370
<![CDATA[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.]]>
<![CDATA[Performance Assessment of Bondoyudo Watershed Management ]]>
<![CDATA[Hery Budi Sulaksono]]>;
<![CDATA[Gusfan Halik]]>;
<![CDATA[Retno Utami Agung Wiyono]]>
<![CDATA[ U Karst Vol 5, No 1 (2021): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v5i1.1429
<![CDATA[Continues decrease of vegetation will result in a high erosion and sedimentation rate in the Bondoyudo watershed. This will result in reduced water retention capacity and accelerate land degradation. This study aims to monitor and evaluate the performance conditions of the Bondoyudo watershed according to the assessment parameters of the weighting criteria, which include land criteria, water management criteria, socio-economic criteria, water construction investment criteria, and space utilization criteria. Information about the upper part, middle part, and lower part of Bondoyudo River is collected from primary data, secondary data, and analysis results. The score of the watershed evaluation's carrying capacity is obtained from the results of the analysis from each weighting and scoring value of each criterion and sub-criteria. Watershed performance classifications are obtained by adding up the scores of each criterion. The watershed classification's total score is 103.25, which is classified as a medium recovery level category. It necessary to manage and restore the carrying capacity of the Bondoyudo watershed in supporting the development of water resources so that there is no decline in the performance of the Bondoyudowathersed. Recommended activity plans are water resources conservation, and utilization integrated control and involving stakeholders in watershed management]]>
<![CDATA[Tsunami Mitigation Strategy at Watu Ulo Beach Based on Numerical Modeling Using Delft3D-Flow ]]>
<![CDATA[Risqi Sofiana]]>;
<![CDATA[Retno Utami Agung Wiyono]]>;
<![CDATA[Indra Nurtjahjaningtyas]]>
<![CDATA[ U Karst Vol 6, No 2 (2022): NOVEMBER ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v6i2.2959
<![CDATA[The coastal area of Watu Ulo Beach in Jember has great resource potential but also the potential for major disasters, such as a tsunami. Tsunamis can cause casualties and destroy buildings. Thus, it is important to assess the possibility of future tsunami disasters. This study aims to simulate a tsunami at Watu Ulo Beach using Delft3D-Flow to analyze the possibility of affected areas. The tsunami modeling is based on two simulations, namely Scenario 1 as model validation using the characteristics of the 1994 Banyuwangi earthquake. Model validation calculation uses the MAPE method <10%. Scenario 2, modeling the southern Java megathrust earthquake, was analyzed to obtain the time and wave height as well as tsunami run-up and inundation, visualizing the area affected by Watu Ulo Beach. The simulation results show that the tsunami wave height at Watu Ulo Beach reached 12.57 m with a travel time of 29 minutes. The run-up elevation was 9.21 m, and the inundation distance was 2.38 km from the Watu Ulo coastline, indicating that the tsunami caused substantial damage. As an area affected by the tsunami, Sumberejo Village has an inundation area of 634.68 ha, and Sabrang Village has an area of 250.03 ha. The temporary evacuation location for Watu Ulo Beach is set at Tanjung Papuma Street via the shortest route of 0.57 km from the assembly point. Based on the results of this study can be used as a reference for determining temporary evacuation routes and locations for tsunami disaster mitigation in coastal areas.]]>
<![CDATA[Flood Vulnerability Assessment of Kali Welang Floodplain by Using AHP-Based Methods ]]>
<![CDATA[Ageng Dwi Wicaksono]]>;
<![CDATA[Entin Hidayah]]>;
<![CDATA[Retno Utami Agung Wiyono]]>
<![CDATA[ U Karst Vol. 5 No. 1 (2021): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v5i1.1370
<![CDATA[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.]]>
<![CDATA[Performance Assessment of Bondoyudo Watershed Management ]]>
<![CDATA[Hery Budi Sulaksono]]>;
<![CDATA[Gusfan Halik]]>;
<![CDATA[Retno Utami Agung Wiyono]]>
<![CDATA[ U Karst Vol. 5 No. 1 (2021): APRIL ]]>
Publisher : <![CDATA[Kadiri University ]]>
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DOI: 10.30737/ukarst.v5i1.1429
<![CDATA[Continues decrease of vegetation will result in a high erosion and sedimentation rate in the Bondoyudo watershed. This will result in reduced water retention capacity and accelerate land degradation. This study aims to monitor and evaluate the performance conditions of the Bondoyudo watershed according to the assessment parameters of the weighting criteria, which include land criteria, water management criteria, socio-economic criteria, water construction investment criteria, and space utilization criteria. Information about the upper part, middle part, and lower part of Bondoyudo River is collected from primary data, secondary data, and analysis results. The score of the watershed evaluation's carrying capacity is obtained from the results of the analysis from each weighting and scoring value of each criterion and sub-criteria. Watershed performance classifications are obtained by adding up the scores of each criterion. The watershed classification's total score is 103.25, which is classified as a medium recovery level category. It necessary to manage and restore the carrying capacity of the Bondoyudo watershed in supporting the development of water resources so that there is no decline in the performance of the Bondoyudowathersed. Recommended activity plans are water resources conservation, and utilization integrated control and involving stakeholders in watershed management]]>
