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All Journal Jurnal Mahasiswa Jurusan Teknik Pengairan Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Kelautan Tropis INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Beselly Putra, Sebrian Mirdeklis
Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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ANALISIS PENGARUH TATA GUNA LAHAN TERHADAP EROSI, LIMPASAN DAN SEDIMENTASI DI DAS COMAL KABUPATEN PEMALANG MENGGUNAKAN ARCSWAT Pramesi, Gading Komala; Andawayanti, Ussy; Putra, Sebrian Mirdeklis Beselly
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 1, No 2 (2018)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Abstract

ABSTRAKBencana yang sering terjadi di DAS Comal adalah banjir dan tanah longsor, untuk menyelesaikan masalah-masalah yang terjadi pada DAS Comal diperlukan perencanaan pengelolaan dan usaha konservasi DAS yang sesuai untuk DAS Comal. Penelitian ini bertujuan untuk menghitung besarnya lompasan, erosi, dan sedimentasi dengan melakukan simulasi model ArcSWAT akibat pengaruh tata guna lahan dan menentukan skenario tata guna lahan yang optimal untuk DAS Comal. Untuk mengetahui besarnya limpasan, erosi dan sedimentasi yang diakibatkan oleh perubahan tata guna lahan adalah dengan menggunakan program ArcSWAT melalui 4 proses yaitu delineasi DAS, pembentukan Hydrological Response Unit (HRU), pembuatan database dan simulasi model, serta proses visualisasi model. Hasil penelitian menunjukan besarnya limpasan rata-rata 147,173 mm/tahun, erosi rata-rata 88,617 ton/ha/tahun dan sedimentasi rata-rata 9,380 ton/ha/th. Hasil ini menunjukan DAS Comal termasuk dalam DAS yang tingkat kekritisan lahannya kritis dengan kriteria 1,255 % sangat kritis, 46,591 % kritis, 16,140 semi kritis dan 36,014 potensial kritis. Dari peta tataguna lahan rekomendasi yang sudah dibuat, dengan mengubah tataguna lahan pertanian menjadi hutan (sesuai dengan fungsi kawasan DAS Comal). Hasil dari skenario pembuatan tataguna lahan rekomendasi menunjukan penurunan terhadap laju limpasan sebesar 11,847 %, erosi sebesar 31,570 % dan sedimentasi sebesar 29,394 %.Kata kunci : Perubahan tata guna lahan, ArcSWAT, Daerah Aliran Sungai, Limpasan, Erosi, SedimentasiABSTRACT The commo nt disasters in Comal Watershed are floods and landslides, to solve the problems it is to look appropriate watershed management and conservation management plant. This study aims to calculate the magnitude of run-off, erosion, and sedimentation by utilizing ArcSWAT model. ArcSWAT program through 4 processes: watershed delineation, Hydrological Response Unit (HRU), database and model simulation, and model visualization process. The results showed an average runoff rate of 147.173 mm / year, average erosion of 88.617 ton / ha / year and sedimentation averaged 9.380 ton / ha / year. This result shows that this watershed is in criticial land, with parameter very critical 1.255% , 46.591% critical, 16,140 semi critical and 36.014 critical potentials. That have been made by switch landuse of agricultural into forest (suitable with the function of the Comal Watershed area). The results show a decrease in runoff 11.847%, erosion 31.570% and sedimentation 29.394%. Keywords: Land use changes, ArcSWAT, Watershed, Run off, Erosion, Sediment,and Runoff
SIMULASI NUMERIS PERUBAHAN MORFOLOGI PANTAI DENGAN MENGGUNAKAN MODUL CMS-FLOW DI PANTAI NUSA DUA, BALI Nurhayati, Ima; Dermawan, Very; Putra, Sebrian Mirdeklis Beselly
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 1, No 2 (2018)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Abstract

Abstrak Wilayah pantai di Indonesia sangat intensif digunakan untuk kegiatan manusia. Sebagai dampak dari kegiatan tersebut maka timbul masalah-masalah baru seperti erosi pantai. Untuk menanggulangi permasalahan tersebut pada pantai Nusa Dua, Bali dibangun satu segmen bangunan pengaman pantai (Groin) agar kondisi profil pantai menjadi seimbang. Untuk memahami kondisi tersebut dilakukan studi dengan menggunakan model numeris 2D Coastal Modelling System-Flow (CMS Flow) dalam interface SMS (Surface water Modelling System) v 11.0. CMS-Flow  digunakan untuk menghitung arus dan tingkatan air yang dikombinasikan gelombang saat bawah gesekan angin, gelombang, pasang surut, kekuatan coriolis, dan pengaruh struktur pantai. Variabel utama U, v-kecepatan, dan ketinggian air disimpan di poin grid yang sama dengan interpolasi momentum. Formula transpor sedimen unified, van Rijn, dan formula transpor non-equilibrium (NET). Pemodelan dilakukan dalam jangka menengah dengan waktu simulasi tiga bulan menggunakan 3 kondisi. Besaran nilai erosi dan sedimentasi terbesar merupakan fokus dari studi. Hasil pemodelan CMS-Flow menunjukkan kondisi krusial pantai terjadi pada segmen groin UG.1-GN.2 dan GN.2-G.12, hal ini disebabkan bentuk segmen groin yang kurang sesuai dengan pola arus yang ada. Evaluasi struktur groin di masa depan diharapkan dapat dilakukan dengan memperhatikan pola arus dan gelombang dominan datang untuk memperhitungkan jarak antar struktur, sehingga dapat mencegah terjadinya turbulensi dan gerusan.   Kata Kunci: Perubahan Morfologi, Analisis hidrodinamik, Groin, USACE CMS-Flow   Abstract The coastal areas of Indonesia are very intensive for human activities. As a result of these activities there are new problems such as coastal erosion. To solve the problem on the beach of Nusa Dua, Bali built a segment of coastal protection building (Groin) so that the condition of beach profile to be balanced. To understand the condition, a study using numerical modeling 2D Coastal Modeling System-Flow (CMS Flow) in SMS interface (Surface water Modeling System) v 11.0 is used. CMS-Flow is used to calculate the current and water levels of the combined waves when under wind, wave, tidal friction, coriolis strength, and the influence of coastal structures. The main variables U, v-velocity, and water level are stored in the same grid points as the momentum interpolation. Unified sediment transport formula, van Rijn, and non-equilibrium transport formula (NET). Modeling is done in the medium term with three months simulation time using 3 conditions. The largest value of erosion and sedimentation is the focus of the study. The CMS-Flow modeling results show that coastal crucial conditions occur in the groyne segments UG.1-GN.2 and GN.2-G.12, this is due to the shape of the groy segment that is less suited to the current pattern. Evaluation of the groyne structure in the future is expected to be done by observing the pattern of current and the dominant wave coming to take into account the distance between structures, so as to prevent turbulence and scour. Keywords: Morphological Change, Hydrodynamic Analysis, Groin, USACE CMS-Flow
SIMULASI NUMERIS PERUBAHAN MORFOLOGI DASAR LAUT PADA DESAIN PELABUHAN DI KABUPATEN GRESIK, INDONESIA Beselly Putra, Sebrian Mirdeklis; Suharyanto, Agus; Pujiraharjo, Alwafi
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 8, No 1 (2017)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (708.996 KB) | DOI: 10.21776/ub.jtp.2017.008.01.13

Abstract

ABSTRAK Pengembangan konstruksi Indonesia yang cepat akhir-akhir ini salah satunya dipicu dengan kebijakan tol laut dengan cara pembangunan pelabuhan baru. Salah satunya adalah di Kabupaten Gresik sebagai bongkar barang curah cair dan curah padat. Dibangunnya pelabuhan ini adalah mengurangi beban dan lama tunggu bongkar muat di Tanjung Perak sebagai pelabuhan utama. Besaran lahan reklamasi untuk pelabuhan dan panjang dermaga yang direncanakan akan berhubungan terhadap perubahan morfologi dasar laut. Untuk memahami kondisi tersebut studi dilakukan dengan menggunakan model numeris 2D Coastal Modeling System-Flow (CMS Flow). CMS-Flow menyelesaikannya dengan depth-integrated continuity dan persamaan momentum menggunakan metode volume-hingga. Formula transpor sedimen unified, van Rijn, dan formula transpor non-equilibrium (NET). Pemodelan jangka menengah dijalankan dengan waktu simulasi tiga bulan dengan 5 macam alternatif. Besaran sedimentasi yang minimum di dalam kolam pelabuhan adalah inti dari peninjauan studi. Alternatif yang ketiga dengan desain lolos air memberikan nilai erosi-sedimentasi yang paling kecil, sehingga membuat arus pasang surut dan sungai lebih stabil. Pengembangan dari reklamasi pelabuhan di masa depan disarankan maksimum pada jarak 2700m atau kurang dari garis pantai untuk mencegah turbulensi lebih lanjut. Key words: Perubahan morfologi, analsis hidrodinamik, alternatif pelabuhan, USACE CMS-Flow ABSTRACT The rapid development of Indonesia leads to Sea Toll Policy by Indonesian government. One of the potential locations is in Gresik Regency as solid and liquid bulk cargo. Purpose of the new harbor is to reduce dwelling time in Tanjung Perak harbor. The amount of land reclamation and the size of the port is strictly related with local sea bed morphological change. This study is conducted using the Coastal Modeling System-Flow (CMS-Flow) 2D numerical model. The unified sediment transport formula, the van Rijn, and a non-equilibrium transport formula (NET) were applied for the computation of sediment transport and morphology change. 5 alternatives medium-term CMS-Flow runs, with simulated times of three months. Minimum sedimentation rate inside harbor is key of the assessment. The chosen alternative model 3 with permeable design gives the lowest rate of erosion and sedimentation that makes tidal and river current are more stable. Development of port reclamation is suggested maximum 2700 m from the shoreline or less to prevent further turbulences. Key words: Morphological changes, hydrodynamic analysis, harbor alternatives, USACE CMS-Flow
Determination of Curve Number for the Temef Watershed, Timor Tengah Selatan Regency Welkis, Davianto Frangky; Harisuseno, Donny; Wahyuni, Sri; Beselly, Sebrian Mirdeklis
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 14 No. 2 (2023)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2023.014.02.1

Abstract

This study aims to show that the Curve Number (CN) method can represent the relationship between rainfall runoff in the Temef Watershed, an area of ​​East Nusa Tenggara. The method used in this study was quantitative analysis by linking watershed characteristics such as soil, vegetation, and land use with the CN curve number, which shows the potential flow for a certain rainfall. CN data were re-analyzed using a computer program to obtain actual field conditions, which were then classified to obtain land cover quality, soil type, CN value, and Antecedent Moisture Condition (AMC) value for the Temef Watershed. Based on the study's results, it was found that the Temef Watershed was dominated by secondary dry land forest cover, which ranged from 28.50-52.00%. The lithological texture of rocks in the Temef Watershed is dominated by conglomerate and gravel with a gradation rate from medium to high; sandy marl, sandstone, tuft, and dacite of medium to a high gradation; and scaly clay with very low to low gradation. The CN value is 69.45, classified as medium gradation at normal soil moisture levels. The benefits of this result include the practical application of the CN method, the provision of accurate field conditions through re-analysis, insights into dominant land cover and lithological texture, and the establishment of CN values for effective water resource management.
Wave Characteristics in the Northern Waters of Central Java Based on the Wavewatch III Numerical Model Efendi, Usman; Ismanto, Aris; Rochaddi, Baskoro; Putra, Sebrian Mirdeklis Beselly
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.24850

Abstract

The northern coast of Central Java is a strategic development area, but it has the potential for high wave disasters. Planning activities and mitigating maritime disaster risks requires an understanding of wave characteristics. This study analyzes wave characteristics in the northern waters of Central Java using the Wavewatch III numerical model. Significant wave height and wave direction were averaged from 2014 to 2023. The results showed that wave conditions in the northern waters of Central Java tend to be higher in December, January, February, July, August, and September. Meanwhile wave conditions tend to be lower in March, April, May, June, October, and November.
Assessing Liquefaction Risk at Timika Steam Power Plant through Cyclic Stress Ratio Analysis Using Borehole Data Marsudi, Suwanto; Lufira, Rahmah Dara; Sajali, Muhammad Amar; Putra, Sebrian Bessely Mirdeklis; Asmaranto, Runi; Prasetyorini, Linda
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 16 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2025.016.01.9

Abstract

Energy infrastructure, particularly power plants, is critical in national and regional development. This study aims to determine the optimal placement and design of the Timika PLTU (power plant) by conducting comprehensive soil and rock investigations, focusing on seismic risks. The primary objective is to assess the geotechnical conditions of the site to ensure structural stability and safety in this high-seismicity zone. Key methods used in this study include borehole drilling, soil classification tests, and seismic hazard analysis. The soil at the site is classified as medium (SD) with Vs values ranging from 175 to 350 m/sec, and the seismic zone’s coefficient (Z) is 0.6, indicating significant seismic potential. The results reveal that specific design measures, such as sheet piles and retaining walls, are necessary to mitigate the risks of lateral collapse in areas with significant soil excavation. Furthermore, seismic design considerations were incorporated to improve the plant’s earthquake resistance. The findings of this study provide essential geotechnical data and practical recommendations, ensuring the safe and resilient construction of the PLTU Timika in a region prone to seismic activity while guiding future infrastructure projects in similar high-risk zones.
Flood Discharge Reduction Analysis of Ciawi and Sukamahi Dry Dams Dasylva, Iqbal Zaenal; Sumiadi, Sumiadi; Prasetyorini, Linda; Beselly, Sebrian Mirdeklis
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 16 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2025.016.01.1

Abstract

Floods are a natural disaster often experienced by the people of Indonesia, especially in Jakarta. In 2022, the government inaugurated the upstream area of ​​the Ciliwung River Basin. The research provides an in-depth analysis of the reductions achieved by the two dry dams across a range of return periods (Q), specifically 2, 5, 10, 25, 50, and 100 years, highlighting their performance in reducing peak flow volumes and their effectiveness in flood risk management under varying hydrological conditions. Currently, both do not have intake on their conduit channels. With this research, it is hoped that it can be determined whether or not the reduction results will be optimal by adding intake to their conduit channels. The results and analysis obtained on the Ciawi dry dam, namely Q2 can reduce up to 73.49%; Q5 can reduce up to 76.17%; Q10 can reduce up to 78.49%; Q25 can reduce up to 80.33%; Q50 can reduce up to 66.93%; and Q100 can reduce up to 54.98% while for the results and analysis of reduction in the Sukamahi dry dam for Q2 can reduce up to 78.40%; Q5 can reduce up to 82.24%; Q10 can reduce up to 83.38%; Q25 can reduce up to 84.41%; Q50 can reduce up to 84.94%; and Q100 can reduce up to 85.26%.
ASSESSING THE SUITABILITY OF NATURE-BASED SOLUTIONS (NBS) FOR FLOOD RISK REDUCTION: A CASE STUDY OF THE SERAYU WATERSHED IN PURBALINGGA REGENCY, CENTRAL JAVA Pakungwati, Dinda Ayu; Sejati, Wahyu; Andayani, Sih; Kurniyaningrum, Endah; Aryadi, Eric Virgiawan; Zulfan, James; Beselly, Sebrian Mirdeklis; Ngom, M. B
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 2, OCTOBER 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i2.23649

Abstract

The Serayu Watershed is one of the critical watersheds in Central Java, particularly in the upstream. Aim: This study aims to assess the suitability of nature-based solutions (NBS) in flood risk reduction in the Serayu Watershed. Methodology and results: The collected data included the Serayu Watershed boundary and spatial datasets, consisting of a Digital Elevation Model (DEM), infiltration area map, soil erosion map, land use map, and slope map. The authors applied a spatial analysis method using the Geographic Information System (GIS) to integrate historical flood data, population density, topography, slope, geology, soil type, land use, water catchment area, water absorption area, groundwater basin, and erosion rate. The study found that within 10 years (2014-2023), 54 villages were exposed to flooding with a total area of ​​6,453.3043 ha or 8.010% of the area of ​​Purbalingga Regency. The analysis of land use changes from 2017 to 2022 shows a significant decrease in the area of ​​plantation forests-by 225,477.67 ha, from 323,979.26 ha to 98,501.58 ha. Conclusion, significance, and impact study: This study examines the regional characteristics and flood patterns of the Upper Serayu River in Central Java, Indonesia. Drawing on spatial analysis and hydrological data, the findings identified five NBS recommended for implementation: river floodplain restoration river and stream renaturation, building-related interventions, bioretention areas, and urban farming. These strategies align with local geormorphological conditions and offer sustainable approaches to flood mitigation. This study contributes to regional policy-making and supports the development of flood risk management in the Upper Serayu Watershed.
Co-Authors Agus Suharyanto Alwafi Pujiraharjo Aris Ismanto Baskoro Rochaddi Dasylva, Iqbal Zaenal Donny Harisuseno Efendi, Usman Endah Kurniyaningrum Eric Virgiawan Aryadi Linda Prasetyorini M. Amar Sajali Ngom, M. B Nurhayati, Ima Pakungwati, Dinda Ayu Pramesi, Gading Komala Rahmah Dara Lufira Runi Asmaranto Sih Andayani, Sih Sri Wahyuni Sumiadi, Sumiadi Suwanto Marsudi Ussy Andawayanti Very Dermawan Wahyu Sejati Welkis, Davianto Frangky Zulfan, James