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All Journal Jurnal Kelautan : Indonesian Journal of Marine Science and Technology Indonesian Fisheries Research Journal Jurnal Kelautan Nasional Jurnal Segara
Guntur Adhi Rahmawan
Research Institute for Coastal Resources and Vulnerability
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology

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DISTRIBUSI SEDIMEN DASAR SEBAGAI IDENTIFIKASI EROSI PANTAI DI KECAMATAN BREBES MENGGUNAKAN ANALISIS GRANULOMETRI Wisnu Arya Gemilang; Ulung Jantama Wisha; Guntur Adhi Rahmawan
Jurnal Kelautan Vol 10, No 1 (2017)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v10i1.2156

Abstract

Dinamika kawasan pesisir Kecamatan Brebes berupa bencana abrasi dan akresi yang terjadi memiliki dampak besar terhadap kerusakan kawasan mangrove dan pesisir. Fenomena abrasi dan akresi yang terjadi dipengaruhi oleh parameter oseanografi yang dapat mempengaruhi sebaran sedimen di pesisir. Penelitian ini bertujuan untuk mengetahui karakteristik pembangkit fenomena abrasi dan akresi di pesisir Kecamatan Brebes serta bentuk mitigasi yang tepat untuk mengurangi bencana abrasi. Metode yang digunakan adalah descriptive kuantitatif dan analisis yang dilakukan adalah pengukuran arus, pengukuran pasang surut, pemetaan batimetri, analisis ukuran butir sedimen dan pemodelan hidrodinamika 2 dimensi. Sedimen berupa pasir, lanau, dan pasir lanauan dengan nilai rerata ukuran butir 5.00 phi – 8.00 phi. Kecepatan arus sepanjang pantai hasil model pada kondisi purnama berkisar 0-0,12 m.s-1 dan pada saat perbani berkisar antara 0-0,08 m.s-1, dengan dominasi arah arus menuju ke Timur dan Timur laut. Perlu dilakukan penataan ulang terhadap kawasan mangrove dan bangunan pelindung pantai serta melakukan pencodetan terhadap sungai – sungai utama yang merupakan sumber pembawa material sedimen sehingga dapat memberikan suplay endapan sedimen di bagian pesisir.Kata Kunci: Brebes, erosi, arus sepanjang pantai, mitigasi, sedimenBED SEDIMENT DISTRIBUTION FOR IDENTIFICATION OF THE COASTAL EROSION IN BREBES SUBDISTRICT USING GRANULOMETRI ANALYSISThe dynamics of erosion and accretion in the coastal area of Brebes Subdistrict have many impacts on mangrove destruction and coastal region. The erosion and accretion are influenced by oceanography parameters that can affect the distribution of coastal sediments. The aims of this research were to determine the characteristics of the phenomenon of erosion and accretion in coastal Brebes Subdistrict and shape appropriate mitigation to reduce the erosion. This research is done with the bed sediment sampling using grab sampler for 26 sampling point. Current and tide measurement are conducted wih ADCP deployment for 15 days’ measurement. Sediment characteristic analysis done with granulometri and statistic analysis. The average of sediment sorting is 1.21, skewness is 0.088 and the kurtosis is 3.76. Generally, bed surface sediment distribution pattern is dominated by clay to sand, the grand size distribution of sediments are sand, silt, sandy silt and silty sand. Longshore current speed ranged between 0-0.12 m.s-1 at the spring tide condition and ranged between 0-0.08 m.s-1at the neap tide condition, the domination of current direction towards to the East and Northeast. The mitigation is very needed to rearrange the mangrove areas, build the coastal protection and recover the main river line which is the sourceof the sediment materials, so that can be provide the supply of sediment deposition in the coastal area. Keywords: Brebes, Erosion, Longshore Current, Mitigation, Sediment
CORAL REEF CONDITION IN RELATION TO CORAL REEF FISH ABUNDANCES BEFORE MASS BLEACHING EVENT IN SIMEULUE ISLANDS, ACEH Ulung Jantama Wisha; Koko Ondara; Wisnu Arya Gemilang; Guntur Adhi Rahmawan; Ruzana Dhiauddin; Ilham Ilham
Indonesian Fisheries Research Journal Vol 25, No 2 (2019): (December) 2019
Publisher : Research Center for Fisheries

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/ifrj.25.2.2019.64-74

Abstract

Bordered with the Indian Ocean, Simeulue Islands is one of the outermost islands in Indonesia located in the west part of Aceh Province. Simeulue waters are productive areas due to the unpolluted condition yet and great of biomass. Three regions were particularly observed, those are Simeuluecut, Ganting, and Labuhan Bajau. In those areas, the existing marine tourism activities might influence the coral reef ecosystem studied. This study aimed to evaluate the condition of coral and coral reef fish in those three particular regions before mass bleaching event in 2016 triggered by ENSO. Point Intercept Transect (PIT) method was employed to record the percentage cover of coral, species diversity, and coral reef fish. Ganting waters was a moderate ecosystem area whith the percentage coverage was up to 45.62%. However, in Simeuluecut and Labuhan Bajau waters, the coral reef communities were excellent with coral percentage coverage reached 83.12% and 81.25 %, respectively. The highest  abundance genera of coral reef fish was observed in Simueluecut waters. This condition was changed oppositely in 2016 when mass bleaching threatened Simeulue waters due to temperature anomaly triggered by ENSO phenomenon. The temperature increases almost 3oC for 6 months that undoubtedly induced bleaching that about 50% of coral colonies were dramatically declined in coral coverage and coral recruitment. 
Identifikasi Awal Potensi Tinggalan Budaya Bawah Laut Kalimantan Barat, Berdasarkan Data Side Scan Sonar Wisnu Arya Gemilang; Nia Naelul Hasanah Ridwan; Ulung Jantama Wisha; Guntur Adhi Rahmawan; Z Tahir
Jurnal Kelautan Nasional Vol 15, No 1 (2020): April
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1105.169 KB) | DOI: 10.15578/jkn.v15i1.7363

Abstract

Kalimantan Barat tidak terlepas dari sejarah perkembangan kesultanan-kesultanan Melayu dan terletak di sepanjang tepian Sungai Kapuas. Masuknya VOC sebagai kongsi dagang Belanda, semakin memperkuat jaringan perdagangan global sepanjang Sungai Kapuas. Jaringan perdagangan di kawasan Asia Tenggara menggunakan jalur utama melalui laut dan sungai, oleh karena itu tinggalan budaya bersejarah baik di darat maupun di bawah air menjadi potensi di Kalimantan Barat. Sebaran titik tinggalan budaya bawah air Kalimantan belum banyak dibuktikan dan diidentifikasi. Metode identifikasi potensi tinggalan budaya bawah air menggunakan pemetaan side scan sonar serta dikombinasi dengan model profil bawah laut dan kondisi arus sekitar lokasi dilakukan pada November 2017. Hasil side scan sonar yang dilakukan scanning sepanjang 500m setiap lokasi hanya menunjukkan 1 anomali adanya indikasi BMKT (Barang Muatan Kapal  Tenggelam) di lokasi-2 dekat pulau Datu. Dimensi temuan BMKT tersebut dengan panjang kapal 15,9 meter dan lebar kapal mencapai 4,5 meter, dengan kedalaman 27-33 meter. Tingginya tingkat sedimentasi karena berada diantara muara sungai besar menjadi penyebab tertimbunnya tinggalan budaya bawah air di Kalimantan, sehingga sulit teridentifikasi. Kondisi arus yang cukup kuat menyebabkan BMKT dengan mudah bergeser atau berpindah tempat. Penelitian lebih lanjut dengan kemampuan alat berteknologi tinggi yang dapat menembus ketebalan sedimen sangat dibutukan untuk identifikasi tinggalan budaya bawah air di Kalimantan Barat.
Assessing Mandeh Region as the Center of Marine Ecotourism in West Sumatra Province, Indonesia: Mass Tourism Issue and Vulnerability Aspects Ulung Jantama Wisha; Try Al Tanto; Nia Naelul Hasanah Ridwan; Guntur Adhi Rahmawan; Ruzana Dhiauddin; Koko Ondara; Wisnu Arya Gemilang
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (712.702 KB) | DOI: 10.15578/segara.v17i2.9459

Abstract

Nowadays, Mandeh Region has developed significantly as the center of marine ecotourism in West Sumatra Province. Many local and international tourists were visiting this site. Due to those conditions, many threats emerged, such as mass tourism evoking damages and pollutions. This study aimed to examine the feasibility of the Mandeh Region for tourism activity and identify the impacts of mass tourism. A direct survey has been conducted. We assessed water quality, accessibility, and social conflicts using a scoring method. A modified matrix categorizing some parameters as the underlying data for marine tourism sustainability was used. We also developed Smartline and CVI model to assess the vulnerability level along Mandeh coastal bay. Local zonation was recommended to reduce more environmental damages. We examined the feasibility of the Mandeh region as a place for ecotourism that reached 71.12 %, indicating this area is sufficiently feasible. The absence of local regulations before the Mandeh region was established as the center of marine ecotourism resulted in mass tourism phenomena that elevated marine litter accumulation. Moreover, the development of many resorts near the coast has recently played a role in triggering pollution and damage. Advanced regulation and management are necessary to diminish negative impacts on both the environment and society.
Modeling the Possible Impacts of Dredging Activities in the Fishery Port of Carocok, Pesisir Selatan Regency, West Sumatra: Hydro-Geo-Oceanographical Approaches Wisnu Arya Gemilang; Ulung Jantama Wisha; Guntur Adhi Rahmawan; Nia Naenul Hasanah Ridwan; Ilham Ilham
Jurnal Segara Vol 18, No 2 (2022): August
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i2.11426

Abstract

Carocok Fishery Port (PPP Carocok) is a supporting facility for capturing fishery in the Pesisir Selatan Regency. Thus, bathymetry monitoring the shipping lane and the port pool dredging is crucial to bolster fishery activities. This study aims to model the possible impact when massive dredging is applied based on geological and oceanographical approaches. The bottom sediment sampled in the field was analyzed using a granulometric method. A direct bathymetry survey was also done using a single beam echosounder and tide gauge deployment. Hydrodynamic modeling was employed to predict the changes in water motion characteristics if dredging is applied—a scenario applying bathymetry profile after dredging was applied in the simulation. The bathymetry contour within Carocok Bay was relatively declivous, categorized as shallow water with a depth ranging from -2.5 to -15 m. The sediment type in the study area consisted of sand, sandy clay, clayey sand, silty sand, and mixed textures. The tidal current motions (ranging from 0 to 0.053 m/s) are the primary factor transporting the water mass within the port pool, which also impacts sediment transport in the semi-enclosed water area. The sediment characteristics showed that the sediment is deposited in low-energy conditions. It is modeled that the dredging plan in the PPP Carocok will not cause any significant changes, including bathymetry alteration and water environment. Therefore, the port pool is still appropriate to espouse fishery activities in the Carocok Port without dredging.
Co-Authors Ilham Ilham Koko Ondara Nia Naelul Hasanah Ridwan Nia Naenul Hasanah Ridwan Ruzana Dhiauddin Try Al Tanto UlUNG JANTAMA WISHA Ulung Jantama Wisha Ulung Jantama Wisha Wisnu Arya Gemilang Wisnu Arya Gemilang Z Tahir