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All Journal Jurnal Teknik Pengairan: Journal of Water Resources Engineering Proceedings ACES (Annual Civil Engineering Seminar) Asean Journal of Science and Engineering (AJSE) Makara Journal of Technology
Keisuke Murakami
Department of Civil Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki, 889-2192, Japan
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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MODEL NUMERIK UNTUK SIMULASI ALTERNATIF PERLINDUNGAN PANTAI BERBASIS SISTEM INFORMASI GEOGRAFIS Sutikno, Sigit; Handoyo, Dwi Puspo; Fauzi, Manyuk; Murakami, Keisuke
Proceedings ACES (Annual Civil Engineering Seminar) Vol 1 (2015): Annual Civil Engineering Seminar (ACES)
Publisher : Proceedings ACES (Annual Civil Engineering Seminar)

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Abstract

Penelitian ini melakukan simulasi numerik alternatif perlindungan pantai dalam rangka untukmitigasi fenomena abrasi di Pantai Tanjung Motong Kabupaten Kepulauan Meranti ProvinsiRiau. Simulasi dilakukan dengan menggunakan perangkat lunak GENESIS (GENEralizedmodel for SImulating Shorline change). Data-data yang dipakai untuk pemodelan adalah datatopografi, bathimetri, angin dan jenis tanah. Peramalan gelombang dilakukan denganmenggunakan data angin setiap jam selama 12 tahun (2001 – 2012) untuk mendapatkan tinggidan periode gelombang rencana. Model dikalibrasi dengan menggunakan dua data historisgaris pantai yang diekstrak dari citra satelit, yaitu data Landsat-5 TM dan Landsat-8 OLI/TIRSmasing-masing untuk Tahun 1990 dan Tahun 2014. Kedua data garis pantai tersebut kemudiandianalisis berbasis sistem informasi geografis dengan menggunakan DSAS (Digital ShorelineAnalysis System) untuk mendapatkan laju perubahan garis pantai pada kurun waktu tersebut.Tujuan utama proses kalibrasi adalah untuk mendapatkan nilai koefisien K1 dan K2 dari modelnumerik sedemikian sehingga tingkat perubahan garis pantai memiliki korelasi yang baikdengan hasil analisis data satelit. Setelah terkalibrasi, maka model bisa digunakan untuksimulasi berbagai alternatif penanganan abrasi di daerah studi. Simulasi dilakukan denganmemprediksi perubahan garis pantai 10 tahun kedepan (2014-2024) dengan tiga skenario, yaitutanpa penanganan, menggunakan sea wall, dan menggunakan detach breakwater. Hasilpenelitian menunjukkan bahwa fenomena abrasi akan terus berlanjut jika tidak ada penanganansecara struktural. Skenario perlindungan pantai baik berupa seawall maupun detachbreakwater bisa mencegah terjadinya fenomena abrasi di Pantai Tanjung Motong.Kata kunci: GENESIS, perlindungan pantai, DSAS
Calibration of Numerical Model for Shoreline Change Prediction Using Satellite Imagery Data Sutikno, Sigit; Murakami, Keisuke; Handoyo, Dwi Puspo; Fauzi, Manyuk
Makara Journal of Technology Vol. 19, No. 3
Publisher : UI Scholars Hub

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Abstract

This paper presents a method for calibration of numerical model for shoreline change prediction using satellite imagery data in muddy beach. Tanjung Motong beach, a muddy beach that is suffered high abrasion in Rangsang Island, Riau province, Indonesia was picked as study area. The primary numerical modeling tool used in this research was GENESIS (GENEralized Model for Simulating Shoreline change), which has been successfully applied in many case studies of shoreline change phenomena on a sandy beach.The model was calibrated using two extracted coastlines satellite imagery data, such as Landsat-5 TM and Landsat-8 OLI/TIRS. The extracted coastline data were analyzed by using DSAS (Digital Shoreline Analysis System) tool to get the rate of shoreline change from 1990 to 2014. The main purpose of the calibration process was to find out the appropriate value for K1 and K2 coefficients so that the predicted shoreline change had an acceptable correlation with the output of the satellite data processing. The result of this research showed that the shoreline change prediction had a good correlation with the historical evidence data in Tanjung Motong coast. It means that the GENESIS tool is not only applicable for shoreline prediction in sandy beach but also in muddy beach.
Role of Coastal Vegetation Belts in Mitigating Tsunami Waves: Bibliometric Analysis, Numerical, and Spatial Analysis Usman, Fadly; Murakami, Keisuke; Wijatmiko, Indradi; Rokman, Mauhibur; Nabila, Meutia Aisyah
ASEAN Journal of Science and Engineering Vol 5, No 1 (2025): (ONLINE FIRST) AJSE: March 2025
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ajse.v5i1.80281

Abstract

Tsunami is a catastrophic natural disaster that is difficult to predict and often results in significant loss of life and property damage. This study examines the role of coastal vegetation belts in mitigating tsunami wave impacts through numerical and spatial analyses. This study also used bibliometric analysis to support the discussion. Numerical simulations using CADMAS Surf 2D were conducted for various scenarios to assess the effect of vegetation belts on wave speed and height. Spatial analysis using ArcGIS was employed to map tsunami-affected areas, and grid-cell analysis was used to calculate the volume of water entering inland areas during a tsunami event. The results demonstrate that vegetation belts with specific thicknesses and densities significantly reduce wave speed and height, thereby mitigating tsunami energy as it approaches land. These findings emphasize the critical role of vegetation belts in coastal management strategies. Future research should explore integrating natural barriers with artificial infrastructure, such as embankments, to provide comprehensive protection against tsunami impacts.
Reproduction and Characterization of Sedimentation Phenomena in Tanjung Perak Port through Numerical Simulation Using Delft3D Camila, Adristi Nur; Murakami, Keisuke; Sajali, M. Amar; Haribowo , Riyanto
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.2025.016.01.7

Abstract

Tanjung Perak Port in Surabaya, one of the biggest ports in Indonesia, faces significant sedimentation problems that can affect operational capacity. This research aims to investigate these sedimentation problems using a 3-dimensional numerical model with Delft3D software, analyzing wave, tidal, and topographic changes to recommend effective sediment management. This research focuses on Tanjung Perak Harbor in Surabaya, Indonesia, using Delft3D numerical modeling to analyze sedimentation phenomena and examine topography, tidal, wave, and sediment characteristics, and river inflow data from the Mas River and Lamong Rivers. This research divides the depth into three layers with the smallest grid size dx= 10 m and dy= 10 m. Sediment diameter data, used in this simulation with an average grain size (D50) of 0.28 mm from inside the port, will be simulated simultaneously with tidal and wave motion. This simulation is for 1 month using a scale factor of 12, making the simulation equal to 1 year. From the simulation results, the effect of wave movement is relatively small. At 3 locations in the Tanjung Perak port area, sedimentation with an average change in depth of 0.8 m/year was caused by sedimentation carried from the Lamon River and Mas River. Therefore, dredging recommendations are conducted to reduce sedimentation in the port area by constructing a jetty at the mouth of the Mas River. The results showed that the average depth increase changed to 0.4 m/year after the jetty was built, but some erosion occurred around the jetty, 0.0056 m/year.
Co-Authors Camila, Adristi Nur Dwi Puspo Handoyo, Dwi Puspo Fadly Usman Fauzi, Manyuk Haribowo , Riyanto Indradi Wijatmiko M. Amar Sajali Nabila, Meutia Aisyah Rokman, Mauhibur Sutikno, Sigit