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All Journal Marine Research in Indonesia Indonesian Aquaculture Journal International Journal of Remote Sensing and Earth Sciences (IJReSES) Jurnal Pari Amerta Jurnal Geosaintek
Guntur Adhi Rahmawan, Guntur Adhi
Ministry of marine and fishiers
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PARTICLE SIZE CHARACTERISTICS OF RIVERBED SEDIMENTS TRANSPORTED BY TIDAL BORE ‘BONO’ IN KAMPAR ESTUARY, RIAU-INDONESIA Gemilang, Wisnu Arya; Wisha, Ulung Jantama; Rahmawan, Guntur Adhi
Marine Research in Indonesia Vol 43, No 1 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1416.394 KB) | DOI: 10.14203/mri.v43i1.293

Abstract

The presence of tidal bore in the Kampar River (locally known as ‘bono’) may influence sedimentation in the Kampar River and its estuary. Understanding sedimentation mechanisms (e.g., erosion, deposition) is important to communities along the Kampar River, which can be studied by analyzing characteristics of grain size distribution. Here, we study riverbed sediment samples collected from 17 stations using an Ekman grab sampler, accompanied by bathymetry and acoustic Doppler current profiler (ADCP) measurements. Grain size data show that the sediments are coarser upstream and gradually finer downstream. Silty sands are predominant in the upstream section of the river, sands in its river body and sandy silts in the downstream. The results indicate the influence of undular bores on grain size characteristics. We also found that the propagation of bono and Kampar River’s funnelshaped morphology cause intense scouring events of riverbed sediments. Sortation values that range between 0.332.14 suggest unstable currents that result in randomly deposited sediments. The sediment mass transfer per area is positively towards downstream at the low tidal condition. However, after the passage of the bores, the sediment mass transfer area becomes negatively towards upstream.
PARTICLE SIZE CHARACTERISTICS OF RIVERBED SEDIMENTS TRANSPORTED BY TIDAL BORE ‘BONO’ IN KAMPAR ESTUARY, RIAU-INDONESIA Gemilang, Wisnu Arya; Wisha, Ulung Jantama; Rahmawan, Guntur Adhi
Marine Research in Indonesia Vol 43 No 1 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1416.394 KB) | DOI: 10.14203/mri.v43i1.293

Abstract

The presence of tidal bore in the Kampar River (locally known as ‘bono’) may influence sedimentation in the Kampar River and its estuary. Understanding sedimentation mechanisms (e.g., erosion, deposition) is important to communities along the Kampar River, which can be studied by analyzing characteristics of grain size distribution. Here, we study riverbed sediment samples collected from 17 stations using an Ekman grab sampler, accompanied by bathymetry and acoustic Doppler current profiler (ADCP) measurements. Grain size data show that the sediments are coarser upstream and gradually finer downstream. Silty sands are predominant in the upstream section of the river, sands in its river body and sandy silts in the downstream. The results indicate the influence of undular bores on grain size characteristics. We also found that the propagation of bono and Kampar River’s funnelshaped morphology cause intense scouring events of riverbed sediments. Sortation values that range between 0.332.14 suggest unstable currents that result in randomly deposited sediments. The sediment mass transfer per area is positively towards downstream at the low tidal condition. However, after the passage of the bores, the sediment mass transfer area becomes negatively towards upstream.
TENDENCY FOR CLIMATE-VARIABILITY-DRIVEN RISE IN SEA LEVEL DETECTED IN THE ALTIMETER ERA IN THE MARINE WATERS OF ACEH, INDONESIA Rahmawan, Guntur adhi; wisha, ulung jantama
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 16, No 2 (2019)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (778.66 KB) | DOI: 10.30536/j.ijreses.2019.v16.a3091

Abstract

Long-term sea level rise (SLR) leads to increasing frequency in overtopping events resulting from polar ice liquefaction triggered by rising global temperatures. Aceh province is directly bordered by the Indian Ocean, and is subject to the influence of ocean–atmosphere interactions which have a role in triggering temperature and sea level anomalies. Elevated sea level is possibly caused by temperature-induced water mass redistributions. This study aimed to prove that the Indian Ocean Dipole (IOD) and El-Nino–Southern Oscillation (ENSO) had an influence on sea level change in Aceh waters over the six years 2009–2015. Sea level anomaly (SLA) was identified using Jason-2 satellite data for the 2009–2015 period, to enable the mathematical prediction of SLR rate for further years. We found that SLR was approximately 0.0095 mm/year with an upward trend during the six years of observation. Overall, negative mode of IOD and positive phase of ENSO tend to trigger anomalies of sea level at certain times, and have a stronger influence on increasing SLA and sea surface temperature anomaly (SSTA) which takes place in a ‘see-saw’ fashion. Over the period of observation, the strongest evidence of IOD-correlated SLA, ENSO-correlated SLA and SSTA-correlated SLA were identified in second transitional seasons, with more than 50% of R2 value. The upward trend in SLA is influenced by climatic factors that successively control ocean–atmosphere interactions in Aceh’s marine waters. 
LAND SUITABILITY MODELING FOR FISHERY RESOURCE ENHANCEMENT IN THE PADANG PARIAMAN REGENCY, WEST SUMATERA, INDONESIA: GIS AND MULTI-CRITERIA EVALUATION APPROACHES Gemilang, Wisnu Arya; Wisha, Ulung Jantama; Rahmawan, Guntur Adhi; Ondara, Koko; Dhiauddin, Ruzana
Indonesian Aquaculture Journal Vol 19, No 1 (2024): (June, 2024)
Publisher : Agency for Marine and Fisheries Extension and Human Resources

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/iaj.19.1.2024.75-85

Abstract

[Land Suitability Modeling for Fishery Resource Enhancement in the Padang Pariaman Regency, West Sumatera, Indonesia: GIS and Multi-Criteria Evaluation Approaches] Land suitability analysis is required for successful aquaculture planning. Due to the geographical setting of the Padang Pariaman Regency, aquaculture development is likely hindered by the vulnerable coastal area. Suitability assessment of aquaculture projects is crucial to specify the best method espousing sustainable development in the study area. This study aims to select the most proper location to be developed as a center of shrimp aquaculture in the Padang Pariaman Regency. This study employed the multi-criteria decision-making (MCDM), and analytical hierarchy process (AHP) approaches. This study combined the GIS-based analysis, AHP, and MCDM to yield the most proper location for aquaculture development. The three sub-models (engineering, water quality, and infrastructure) are overlaid using the weighted linear combination (WLC) technique. The infrastructure sub-model resulted in the highest coverage of highly suitable criteria with 61.74%. By contrast, the highest percentage of the unsuitable category was found in the water quality sub-model with 17.67%. Of particular concern, 87.5 % of the study area is suitable for aquaculture development. The remaining region is categorized as highly suitable with 11.93%, found in the eastern Padang Pariaman. Thus, we conclude that developing shrimp aquaculture in the study area is possible. Still, the future environmental impacts should be considered beforehand.
Potensi Air Tanah Di Bagian Beach Ridge Daerah Labuhan Bajau Dan Sekitarnya, Kabupaten Simeuleu Berdasarkan Analisis Pengukuran Geolistrik Gemilang, Wisnu Arya; Kusumah, Gunardi; Rahmawan, Guntur Adhi
Jurnal Geosaintek Vol. 4 No. 1 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Akuifer yang terdapat di wilayah pesisir sangat berkaitan dengan bentuk lahan serta mula jadi lingkungan pengendapannya sehingga akan berbeda-beda di tiap-tiap wilayah pesisir. Wilayah pesisir Labuhan Bajau, Teupah Selatan Kabupaten Simeulue, yang memiliki bentukan morfologi beach ridge atau beting gisik. Bentukan morfologi tersebut digunakan sebagai kawasan pemukiman dan aktifitas laut, sehingga diperlukannya penelitian identifikasi potensi air tanah di bagian beach ridge. Pendugaan keberadaan potensi airtanah pada daerah penelitian menggunakan geofisika dengan metode Geolistrik 2D konfigurasi Pole-Dipole untuk pendugaan keberadaan akuifer di bentukan morfologi beach ridge.Hasil interpretasi data geolistrik berupa profil penampang resistivitas bawah permukaan sebanyak 2 lintasan menunjukkan adanya prospek airtanah yang terperangkap pada sistem akuifer lapisan endapan alluvial pantai. Keberadaan akuifer terdapat pada kedalaman 0 - < 30m dari permukaan tanah dengan litologi berupa material lepas berupa batupasir berukuran sedang hingga kasar.
KERENTANAN TINGGALAN BUDAYA BAWAH AIR SITUS KARANG BUI DI PERAIRAN PANTAI UTARA JAWA BARAT Gemilang, Wisnu Arya; Ridwan, Nia Naelul Hasanah; Wisha, Ulung Jantama; Rahmawan, Guntur Adhi; Ilham; Tahir, Zainab
AMERTA Vol. 38 No. 1 (2020)
Publisher : Penerbit BRIN (BRIN Publishing)

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Abstract

Abstract. The Vulnerability of Underwater Cultural Heritages in Karang Bui Site, Northern Coast of West Java. Underwater remains which found in Karang Bui site, Karawang-Subang waters are originated from the colonial period of Vereenigde Oostindische Compagnie (VOC) and occupation period of the Kingdom of the Netherlands in Indonesia. Research on the vulnerability of the Karang Bui site has been conducted by the Ministry of Marine Affairs and Fisheries in 2017-2018. Research methods including observation of sea area; diving activities for site documentation, seabed profiles mapping, and the use of Side Scan Sonar. Besides looting activities that occurred in the past, the threats toward Karang Bui site preservation nowadays are from human and natural factors. Karang Bui site is located in shallow water with a depth of 5-12 m, so during the maximum elevation, the waves height and current velocity which forms at that location is increasing. Sedimentation level in Karang Bui site is also high caused by many rivers estuary around the site. The site is located within the area of P.T. Pertamina petroleum refineries which is likely the spill oil will threaten the archaeological remains. Furthermore, Karang Bui site is located near Patimban, Subang port development area which also the shipping line. Planning and protection measurement needs to be carried out immediately by related institutions and local governments. Thus, due those various vulnerability factors, the lifting of Karang Bui underwater artifacts is important to be done. Abstrak. Tinggalan bawah air yang ditemukan di Karang Bui, perairan Karawang-Subang, berasal dari masa Vereenigde Oostindische Compagnie (VOC) dan masa penjajahan Kerajaan Belanda di Indonesia. Penelitian terhadap kerentanan Situs Karang Bui telah dilakukan oleh Kementerian Kelautan dan Perikanan (KKP) pada tahun 2017-2018. Metode penelitian meliputi observasi kawasan laut, penyelaman bawah air untuk dokumentasi situs, pemetaan profil dasar laut, penggunaan side scan sonar. Selain aktivitas penjarahan pada masa lalu, ancaman terhadap kelestarian Situs Karang Bui saat ini berasal dari alam dan ulah manusia. Situs Karang Bui berada di perairan dangkal dengan kedalaman 5-12 m sehingga saat elevasi maksimal, tinggi gelombang dan kecepatan arus yang terbentuk di lokasi tersebut semakin meningkat. Tingkat sedimentasi di Situs Karang Bui juga tinggi karena banyak muara sungai di sekitar situs. Lokasi situs berada di area kilang-kilang pengeboran minyak bumi milik P.T. Pertamina, yang kemungkinan tumpahan minyak akan mengancam tinggalan arkeologis. Selain itu, lokasi situs berada di dekat area pembangunan pelabuhan Patimban, Subang, juga merupakan alur pelayaran. Perencanaan dan tindakan pelindungan Situs Karang Bui perlu segera dilakukan oleh institusi terkait dan pemerintah daerah. Oleh karena berbagai faktor kerentanan tersebut, pengangkatan artefak bawah air Karang Bui sangat penting untuk dilakukan.
UPAYA KONSERVASI KAPAL KARAM GOSONG NAMBI SEBAGAI BUKTI ADANYA JALUR PERDANGAN MARITIM MASA LALU DI KABUPATEN PESISIR SELATAN, SUMATRA BARAT Wisha, Ulung Jantama; Ridwan, Nia Naelul Hasanah; Dhiauddin, Ruzana; Rahmawan, Guntur Adhi; Kusumah, Gunardi
AMERTA Vol. 38 No. 1 (2020)
Publisher : Penerbit BRIN (BRIN Publishing)

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Abstract

Abstract. Conservation Efforts of Gosong Nambi Shipwreck as an Evidence of the Past Maritime Trading Routes in Pesisir Selatan Regency, West Sumatra. The coastal region of West Sumatra has become one of the main trading routes in the 15th-19th centuries so there is no doubt that this area has many archaeological remains both underwater, coastal area, and buried underground. One of the underwater archaeological remains in this region is the discovery of a shipwreck at the Gosong Nambi coral site which is administratively located in Pesisir Selatan Regency, West Sumatra Province in 2015. This study aims to provide an overview of the current condition of the Gosong Nambi Shipwreck site. Research activities include collecting information, searching the shipwreck’s location, recording data, measuring the visible dimensions, and sketching the shipwreck, has been done. Visually, it is a small size vessel which was predicted as a cargo ship from the 1900s that might sail from Bengkulu to West Sumatra and crashed into Gosong Nambi coral (Atoll) and then sank. The shipwreck is partially buried in the sand and piles of the dead coral in the stern and most of the ship’s hull had been looted by scarp metal hunters. Natural factors also trigger site vulnerability so it is advisable to excavate. Conservation efforts are necessary to be done with a CRM approach which can have a positive impact on society on socio-economic aspects without harming any related parties. Abstrak. Wilayah pesisir Sumatra Barat menjadi salah satu jalur perdagangan utama pada abad ke-15--19 sehingga tidak diragukan lagi wilayah ini memiliki banyak tinggalan arkeologis baik yang di bawah air, wilayah pantai, maupun terkubur di bawah tanah. Salah satu tinggalan arkeologi bawah air di wilayah ini adalah temuan kapal karam di situs gugusan karang Gosong Nambi yang secara administratif terletak di Kabupaten Pesisir Selatan, Provinsi Sumatra Barat pada tahun 2015.Tujuan dari penelitian ini adalah untuk memberikan gambaran kondisi terkini situs kapal karam Gosong Nambi. Aktivitas penelitian berupa pengumpulan informasi, pencarian lokasi situs, perekaman data, pengukuran dimensi kapal yang terlihat, dan membuat sketsa kapal, telah dilakukan. Secara visual, kapal tersebut termasuk kapal kecil yang diprediksi sebagai kapal barang dari tahun 1900-an yang mungkin berlayar dari Bengkulu menuju ke Sumatra Barat dan menabrak gugusan karang (atol) Gosong Nambi dan akhirnya tenggelam. Kondisi kapal karam tersebut sebagian terkubur dalam pasir dan tumpukan karang mati pada bagian buritan dan sebagian besar lambung kapal telah dijarah oleh para pemburu besi tua. Faktor alam juga menjadi pemicu kerentanan situs sehingga disarankan untuk melakukan ekskavasi. Upaya konservasi perlu dilakukan dengan pendekatan CRM yang dapat berdampak positif terhadap masyarakat pada aspek sosial ekonomi tanpa merugikan berbagai pihak yang terkait.
EVALUASI EFEKTIVITAS PELATIHAN MITIGASI BENCANA LAUT PESISIR DALAM PENINGKATAN PEMAHAMAN MASYARAKAT KABUPATAN PANGANDARAN Gemilang, Wisnu Arya; Rahmawan, Guntur Adhi
Jurnal Pari Vol 10, No 2 (2024): (Desember) 2024
Publisher : BPPSDMKP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jp.v10i2.14665

Abstract

Kabupaten Pangandaran merupakan wilayah pesisir dengan potensi wisata bahari yang tinggi, namun juga memiliki tingkat kerentanan yang signifikan terhadap bencana laut pesisir, seperti tsunami, abrasi, dan banjir rob. Untuk meningkatkan kesiapsiagaan masyarakat, pelatihan mitigasi bencana laut pesisir diselenggarakan dengan tujuan meningkatkan pemahaman serta keterampilan dalam menghadapi bencana. Penelitian ini bertujuan untuk mengevaluasi efektivitas pelatihan melalui metode kualitatif deskriptif dengan analisis pre-test dan post-test, serta kuesioner Rapid Self-Assessment (RSA). Pelatihan ini melibatkan 28 peserta dari berbagai kelompok masyarakat dan pemangku kepentingan serta berlangsung selama tiga hari dengan pendekatan interaktif yang mencakup pemaparan materi, simulasi, dan kunjungan lapangan. Hasil evaluasi menunjukkan peningkatan dalam pemahaman peserta, terbukti dari rata-rata skor pre-test sebesar 55,3 yang meningkat menjadi 82,7 pada post-test. Selain itu, hasil kuesioner RSA menunjukkan bahwa sebelum pelatihan, 49% peserta berada dalam kategori "mengetahui" dan 28% dalam kategori cukup tahu", sementara setelah pelatihan, 56% peserta masuk dalam kategori "mengetahui" dan 49% dalam kategori "sangat mengetahui". Data ini mendukung temuan bahwa pelatihan berbasis simulasi dan pendekatan lokal lebih efektif dibandingkan metode konvensional. Meski demikian, masih terdapat beberapa kendala, seperti keterbatasan anggaran dan belum adanya evaluasi jangka panjang. Peningkatan dukungan dari pemerintah dan pemangku kepentingan dalam mengoptimalkan program pelatihan serta pengembangan sistem monitoring dan evaluasi berkelanjutan. Dengan strategi yang lebih sistematis dan partisipatif, diharapkan masyarakat Pangandaran lebih tangguh dalam menghadapi bencana pesisir di masa depan.  Pangandaran Regency is a coastal area with significant marine tourism potential but also has a high level of vulnerability to coastal disasters such as tsunamis, coastal erosion, and tidal flooding. To enhance community preparedness, a coastal disaster mitigation training program was conducted to improve understanding and disaster response skills. This study aims to evaluate the effectiveness of the training using a qualitative descriptive method through pre-test and post-test analysis, as well as a Rapid Self-Assessment (RSA) questionnaire. The training involved 100 participants from various community groups and stakeholders and was conducted over three days with an interactive approach, including lectures, simulations, and field visits.The evaluation results showed an increase in participants’ understanding, as evidenced by the average pre-test score of 55.3, which increased to 82.7 in the post-test. Additionally, the RSA questionnaire results indicated that before the training, 49% of participants were in the "knowledgeable" category and 28% in the "moderately knowledgeable" category, while after the training, 56% of participants were in the "knowledgeable" category and 49% in the "highly knowledgeable" category. These data support the finding that simulation-based training and a localized approach are more effective than conventional methods. However, challenges remain, such as budget constraints and the absence of long-term evaluation. The support from the government and stakeholders is needed to optimize the training program and develop a sustainable monitoring and evaluation system. With a more systematic and participatory strategy, the Pangandaran community is expected to become more resilient in facing coastal disasters in the future. 
Co-Authors Dhiauddin, Ruzana Gunardi Kusumah ILHAM Koko Ondara, Koko Ridwan, Nia Naelul Hasanah Tahir, Zainab Ulung Jantama Wisha Wisnu Arya Gemilang, Wisnu Arya