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The Study of Flow Resulting from Wave on Lhonga Beach, Aceh Besar Muhammad Irham; Ichsan Setiawan
Journal Omni-Akuatika Vol 13, No 1 (2017): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Dynamic interaction between waves and topographic generate flow dynamics that affect Lhonga coast, Aceh Besar. To analyze the dynamics, the numerical model of currents induced by wave was developed with the explicit finite difference approach method. The model in this study was tested by verifying the result directly with the field data obtained previously. The model is applied in Lhoknga coast of Aceh Besar district with the aim to study how the dynamics of hydro-oceanography as one of the elements to support the preservation of the marine resources of the area. Based on the simulation, the results obtained that the wave occurred in Lhoknga beach relatively small with the dominant direction to the northwest and the maximum of wave height occurs during the high tide condition. The result also informed that the distribution of longshore currents is generally moving from west to east along the coast. The direction of dominant current occurs in the area of 10-15 meters from the shore with an average depth of 6 meters. Keywords: wave flow, flow dynamics, beach, hydro-oceanography

Simulation of sea surface temperature (SST) and sea surface salinity (SSS) in the Bay of Bengal Syamsul Rizal; . Muhammad; Taufiq Iskandar; Ichsan Setiawan; Agus Satriadi,; . Radinal
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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The simulation of Bay of Bengal (included Andaman Sea) has been done. This investigation used equation of motion (Navier-Stokes equation). The equation of motion was solved by means of Hamburg Shelf Ocean Model (HAMSOM). The analysis is done for the year of 2007. The National Centers for Environmental Prediction (NCEP) data for year of 2007 is used to force the Bay of Bengal. The sea surface temperature (SST) and sea surface salinity (SSS) have been obtained and analyzed. The highest SST occurs in April 2007, while the lowest SST occurs in October 2007. The pattern of SST depends on the wind vector. From January untill June 2007, the SSS pattern is a west-east pattern. The SSS value is lower in the east and higher in the west. From July untill December, the higher value of SSS is generally in the middle of the Bay of Bengal. Generally, the value of SSS is higher in July and August, while in December and January the value of SSS is lower. Some results have been compared and consistent with the study of Vinayachandran dan Kurian (2008) and Vinayachandran and Yamagata (1998).

STUDI PERUBAHAN GARIS PANTAI DI WILAYAH PESISIR PERAIRAN UJUNG BLANG KECAMATAN BANDA SAKTI LHOKSEUMAWE Teuku Raihansyah; Ichsan Setiawan; Thaib Rizwan
Jurnal Ilmiah Mahasiswa Kelautan Perikanan Unsyiah Vol 1, No 1 (2016): April 2016
Publisher : Universitas Syiah Kuala

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Ujung Blang Beach Subdistricts Banda Sakti Lhokseumawe Aceh Province located at coordinat 5°12'34.82" N 97°7'18.74" E. The objective of the present study was to determine the shoreline change along Ujung Blang Beach in the past 10 years, it was in 2005, 2007, 2009, 2011, 2013 and 2015. The method used was by utilizing Geographic Information System (GIS) and remote sensing, by taking Google Earth aerial photos. The result showed the shoreline of Ujung Blang Beach changed by average value of accretion per year was 0,2193 ha and average value of abration per year was 0,3819 ha. This value showed that abration occured more bigger than accretion with the difference of the percentage increase 74.15%. For decrease or increase value of shoreline change was 74 m (maximum decrease) and 14 m (maximum increase). Pantai Ujung Blang Kecamatan Banda Sakti Lhokseumawe Provinsi Aceh berada di titik koordinat 5°12'34.82" N 97°7'18.74" E. Tujuan penelitian ini adalah untuk mengetahui perubahan pergeseran garis pantai di sepanjang pantai Ujung Blang dalam kurun waktu 10 tahun yaitu pada tahun 2005, 2007, 2009, 2011, 2013 dan 2015. Metode penelitian digunakan dengan memanfaatkan teknologi Sistem Informasi Geografis (SIG) dan penginderaan jauh, dengan mengambil data foto udara Google Earth. Hasil penelitian ini menunjukkan bahwa garis pantai Ujung Blang mengalami perubahan dengan nilai rata-rata akresi pertahun yaitu 0,2193 ha dan nilai rata-rata abrasi pertahun 0,3819 ha. Nilai ini menunjukan bahwa abrasi terjadi lebih besar dari akresi dengan selisih persentase peningkatan 74,15%. Untuk nilai pengurangan atau penambahan perubahan garis pantai sebesar 74 m (pengurangan maksimum) dan 14 m (penambahan maksimum).

Wave Trajectory Study on the Coast of Lhoknga, Aceh Besar, Indonesia: A Numerical Model Approach Ichsan Setiawan; Mohammad Irham
Civil Engineering Dimension Vol. 20 No. 1 (2018): MARCH 2018
Publisher : Institute of Research and Community Outreach - Petra Christian University

A numerical model of wave trajectory using shoaling and refraction formula was proposed in the coastal waters of Lhoknga, Aceh Besar, Indonesia. The developed model used a two dimensional (2D) numerical methods for wave trajectory with the input of wave height and period; 0.62 m and 8 second for high tide and 0.47 m and 6 second for low tide. This model was tested on site during low tide and high tide conditions for verification. The purpose of this numerical study is to trace the distribution of wave trajectory because of shoaling, wave breaking, and wave refraction. The model determines the wave height and crest pattern of the ray wave trajectory. The simulation result shows the pattern of the wave propagation at Lhoknga beach moves from the northwest to the east and south of the coast. The model also informs that the maximum wave height during high tide condition is 1.72 m and 1.31 m during low tide condition. The result indicates that the coast of Lhoknga has moderate wave conditions caused by a gentle beach bathymetry slope.

Characteristics of Sediment at Littoral Zone of Anoi Itam Beach (Eastern Weh Island, Indonesia) Based on Seasonal Changes Syahrul Purnawan; Sofyatuddin Karina; Rizka V Ayudia; Yopi Ilhamsyah; Ichsan Setiawan
Aceh International Journal of Science and Technology Vol 9, No 3 (2020): December 2020
Publisher : Graduate Program of Syiah Kuala University

Anoi Itam Beach (AIB), located in the eastern part of Weh Island, has the sediment characteristic of dark-sand color. Climatologically, the beach is influenced by two seasons, i.e., south-west (SW) monsoon and northeast (NE) monsoon. Sediment data are collected in the upper and lower littoral zones that are divided into six stations alongshore. Data were collected on October 2016 and April 2017, representing post (SW) monsoon and post-NE monsoon events. To examine the effect of seasonal, sediments statistics, e.g., mean, sorting, skewness, and kurtosis, have been calculated. AIB was characterized as well sorted to poorly sorted sediment. Sediments were identified as mesokurtic in October, varied to leptokurtic and platikurtic in upper littoral and lower littoral, respectively, in April. Grain size in both upper and lower littoral had increased from October to April. The impact on sediment sortation was minor due to the seasonal difference. Sediments in the upper littoral vary slightly skewed than lower littoral, which response to a more positively skewed during seasonal change from SW-monsoon to NE monsoon. The results suggested that lower littoral provide high variability of sediment characteristics depend on the season.

Kajian kualitas air laut di perairan Kota Banda Aceh Koko Ondara; Ulung Jantama; Sri Agustina; Ichsan Setiawan; Syahrul Purnawan
Depik Vol 9, No 3 (2020): December 2020
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Studying the water quality is significant to protect and for coastal area-use planning in Banda Aceh City, Aceh Province. This study took seawater samples from 13 stations in the northern waters of Banda Aceh on September 10-11 2019. Surface water samples were taken using Van Dorn bottle, which were then tested on 22 types of parameters to evaluate the water quality in the area. In general, the results of tests on various water parameters indicate that the sea waters in Banda Aceh are in good condition. Attention needs to be paid to nitrates and phosphates, which indicate values that exceed water quality standards, thus possible to trigger algal blooms.Keywords:Water qualityNitrateFisheryABSTRAKKajian kualitas air sangat penting untuk melindungi serta untuk perencanaan pemanfaatan ruang pesisir di Kota Banda Aceh, Provinsi Aceh. Penelitian ini mengambil sampel air laut dari 13 stasiun yang di perairan utara Banda Aceh pada 10 – 11 September 2019. Sampel air permukaan laut diambil menggunakan botol Van Dorn, yang kemudian dilakukan uji terhadap 22 jenis parameter untuk mengevaluasi kualitas air di perairan utara Kota Banda Aceh. Secara umum, hasil pengujian pada berbagai parameter air menunjukkan bahwa air laut di Banda Aceh dalam kondisi baik. Perhatian perlu diberikan pada kadar nitrat dan fosfat, yang menunjukkan nilai yang melebihi baku mutu air, dimana memungkinkan untuk memicu pertumbuhan alga yang berlebihan di kawasan tersebut.Kata kunci:Kualitas perairanNitratPerikanan

The influences of the Indian Ocean Dipole (IOD) on rainfall in South Aceh Ratna Permatasari; Yopi Ilhamsyah; Syahrul Purnawan; Ichsan Setiawan; Mutia Ramadhaniaty; Sutarni Sutarni; Eko Cahyo Pristiwantoro
Depik Vol 11, No 3 (2022): DECEMBER 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

This study aimed to examine the influences of the Indian Ocean Dipole (IOD) on rainfall in three districts in South Aceh. The analysis was undertaken using Dipole Mode Index (DMI) data and five years of rainfall (2016 to 2020) in West Labuhan Haji, Tapak Tuan, and Bakongan areas. This research employed a correlation analysis and the Principal Component Analysis, followed by Cluster Analysis to investigate the relationship between IOD and rainfall at the study location. The negative IOD occurred in 2016, and the positive IOD occurred in 2017, 2018, 2019, and 2020. The strongest positive DMI was in October 2019 (1.123˚C), while the strongest negative DMI was in July 2016 (0.661˚C). Generally, the sub-districts of West Labuhan Haji, Tapak Tuan, and Bakongan always have high rainfall. The highest rainfall in West Labuhan Haji was recorded in January 2017 (1014 mm/month), in Tapak Tuan in November 2017 (1073 mm/month), and in Bakongan in July 2020 (605 mm/month). The correlation between DMI and rainfall in the three locations shows different findings. Although it was very small, the IOD affected the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. In West Labuhan Haji, the highest correlation was in lag 1 (0.188); in Tapak Tuan, the highest correlation was in lag 2 (0.156), while in Bakongan, the highest correlation was in lag 2 (-0.191). The correlations in these three locations are considered weak. Thus, the IOD is not the main factor affecting the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. As South Aceh is located in windward, the orographic effect may influence high rainfall in this region.Keywords:DMIRainfallPrincipal component AnalysisWest Labuhan HajiTapak TuanBakongan

Analysis of research methodology on the content of heavy metals in sediments on the Indonesian coastal Sayed Abdul Azis; Muhammad Irham; Sugianto Sugianto; Ichsan Setiawan; Amri Adnan
Depik Vol 10, No 3 (2021): December 2021
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Heavy metal pollution is one of the problems that often occurs in Indonesian coastal waters. Comparative methods of looking at heavy metal content in coastal sediments include a way to show similarities and differences between one or more articles by using certain criteria. Different comparison methods to see the heavy metal content in sediments include the AAS (Atomic Absorption Spectrophotometer) method, AAN (Netron Activation Analysis), Regression, and USEPA methods. Based on the comparison of 2 methods, namely: AAS and AAN methods, the most efficient in analyzing heavy metals in sediments in coastal areas is the Atomic Absorption Spectrophotometry (AAS) method compared to the Neutron Activation Analysis (AAS) method.Keywords:CoastalSedimentHeavy MetalSpectrophotometer

Studi penentuan lokasi budidaya kerapu menggunakan keramba jaring apung di perairan Timur Simeulue Syahrul Purnawan; Muhammad Zaki; T.M. Asnawi; Ichsan Setiawan
Depik Vol 4, No 1 (2015): APRIL 2015
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Abstract. Groupers are of considerable economic value in southeast Asia. Cage culture is considered as the proper technology to maximize the sustainable biomass production in a unit area. This research assesses a site selection approach for net-cage grouper mariculture in the eastern coastal area of Simeulue Island, namely Sambai, Kuta Batu and Pulau Bengkalak. Data collection focused on 7 biophysical site capability parameters i.e.: current flow, temperature, water clarity, bottom depth, pH, salinity, dissolved oxygen. Suitability analysis identified all stations was categorized as a very appropriate and appropriate conditions for the fish cage location.Keywords: grouper; mariculture; fish cage; SimeulueAbstrak. Kerapu merupakan komoditas unggulan dan memiliki permintaan pasar yang tinggi di daerah Asia Tenggara. Keramba jaring apung (KJA) dianggap sebagai teknologi yang tepat untuk meningkatkan biomassa budidaya di suatu wilayah. Penelitian ini bertujuan untuk mengkaji kesesuaian lokasi penempatan KJA di wilayah pesisir timur Pulau Simeulue yaitu Sambai, Kuta Batu dan Pulau Bengkalak. Kajian data difokuskan pada tujuh parameter biofisik yaitu arus, suhu, kecerahan, kedalaman perairan, pH, salinitas, dan oksigen terlarut. Analisis kelayakan menunjukkan seluruh stasiun dikategorikan sebagai layak dan sangat layak untuk lokasi budidaya KJA.Kata kunci: Kerapu; marikultur; KJA; Simeulue

Analysis of research methodology on the content of heavy metals in sediments on the Indonesian coastal Sayed Abdul Azis; Muhammad Irham; Sugianto Sugianto; Ichsan Setiawan; Amri Adnan
Depik Vol 10, No 3 (2021): December 2021
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.10.3.21275

Heavy metal pollution is one of the problems that often occurs in Indonesian coastal waters. Comparative methods of looking at heavy metal content in coastal sediments include a way to show similarities and differences between one or more articles by using certain criteria. Different comparison methods to see the heavy metal content in sediments include the AAS (Atomic Absorption Spectrophotometer) method, AAN (Netron Activation Analysis), Regression, and USEPA methods. Based on the comparison of 2 methods, namely: AAS and AAN methods, the most efficient in analyzing heavy metals in sediments in coastal areas is the Atomic Absorption Spectrophotometry (AAS) method compared to the Neutron Activation Analysis (AAS) method.Keywords:CoastalSedimentHeavy MetalSpectrophotometer

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