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All Journal Journal of Geoscience, Engineering, Environment, and Technology Indonesian Fisheries Research Journal Jurnal Kelautan Nasional Jurnal Segara Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan

Wisnu Arya Gemilang

Research Institute for Coastal Resources and Vulnerability

Author-ID : 2390108

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Engineering Environmental Science Materials Science & Nanotechnology Physics

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Articles

Tidal Ellipses Analysis Based on Flow Model Hydrodynamic Data Acquisition in Mandeh Bay, West Sumatera Ulung Jantama Wisha; Ruzana Dhiauddin; Wisnu Arya Gemilang
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 2 (2019): JGEET Vol 04 No 02 : June (2019)
Publisher : UIR PRESS

Mandeh Bay is threatened by sedimentation issue caused by the rapid development of marine tourism area which strongly impacts to the environmental degradation. Due to the semi-enclosed area of Mandeh Bay, the tidal current has a significant role in triggering vertical and horizontal transports within the bay. This study aimed to determine the characteristic of tidal current during the southwest monsoon. We developed a hydrodynamic model based on Navier-Stokes equations using a flexible mesh and tidal forecast in which the validation is performed by ADCP data. The simulation results will be used as the basic data to develop a model which depicts the elliptical pattern of tidal current constituents. Offshore rotary tidal currents which are originally semidiurnal reiterate the elliptical pattern every 6 hours and 12 minutes. The strongest semidiurnal current speeds are observed in the bay mouth ranged from 0.1-0.5 m.s-1. The tidal constituent ellipses are oriented more meridionally and in several areas oriented zonally. The current speed of is the highest at all which the speed is averagely one third of magnitude. While, the two main diurnal tidal constituents ( and ) have the maximum speeds approximately one fifth of magnitude. Thus, the domination of semidiurnal constituents may trigger sediment distribution and accumulation within the bay because of its twice tidal oscillations entering the bay.

ESTIMASI TRANSPOR SEDIMEN DI PERAIRAN KECAMATAN BREBES, JAWA TENGAH BERDASARKAN LAJU SEDIMENTASI DAN PENDEKATAN MODEL NUMERIK WISNU ARYA GEMILANG; ULUNG JANTAMA WISHA
JURNAL GEOLOGI KELAUTAN Vol 17, No 1 (2019)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Erosi dan akresi telah menjadi masalah utama di perairan Kecamatan Brebes. Perubahan pesisir yang sangat dinamis dipicu oleh faktor hidro-oseanografi yang mengendalikan mekanisme transpor sedimen yang terjadi baik di muara maupun diwilayah pantai. Tujuan dari penelitian ini adalah untuk mengetahui tingkat rata-rata laju sedimentasi dan transpor sedimen yang terjadi di kawasan pantai Kecamatan Brebes. Pengambilan data laju sedimentasi menggunakan sediment trap yang kemudian dianalisis secara statistik. Perhitungan total transportasi sedimen dan distribusi vertikal suspensi sedimen dilakukan dengan pendekatan model numerik. Nilai laju sedimentasi berkisar antara 0,243 – 22,724 g.m-2.hari-1 dimana laju tertinggi berada di hulu sungai Pemali, Sungai Pemuda dan hilir sungai Pemali. Nilai sortasi sedimen menunjukkan nilai 1,1 – 1,59 (pemilahan buruk). Nilai skewness (Ski) berkisar antara 0,21 – 0,46 (dominan menceng sangat halus). Nilai kurtosis berkisar antara 1,79 – 4,45 (sangat runcing). Total transportasi sedimen sebesar 43,88 x 10-5 m3/s dan distribusi vertikal konsentrasi sedimen tersuspensi berkisar antara 1-176 mg/L (pasang) dan 3-198 mg/L (surut) dimana transpor sedimen sangat dipengaruhi oleh kondisi oseanografi (gelombang, pasang surut, dan arus sepanjang pantai). Pada saat tinggi gelombang pecah meningkat maka transpor sedimen yang terjadi juga semakin intens termasuk mekanisme erosi dan sedimentasi yang terjadi di dasar perairan.Kata kunci: Laju sedimentasi, model numerik, transpor sedimen, perairan BrebesErosion and accretion has become the main issues in Brebes Sub-District waters. Coastal changes which are very dynamic are triggered by hydro-oceanography factors controlling sediment transport mechanism occurred both in the estuary and coastal area. This study aims to determine the average of sedimentation rate and the sediment transport depiction in Brebes Sub-District coast. Sedimentation rate data collection was done using cylinder sediment trap which was then analyzed statistically. Total transport sediment and suspended sediment vertical distribution were calculated employing numerical model approach. The value of sedimentation rate ranged from 0.243 – 22.724 g.m-2.day-1 in which the highest value was observed upstream Pemali River, Pemuda River, and downstream Pemali River. Sediment sortation ranged from 1.1 – 1.59 (poorly sorted). Skewness (Ski) value ranged from 0.21 – 0.46 (very fine skewed). Kurtosis value ranged from 1.79 – 4.45 (very leptokurtic). Total sediment transport reached 43.88 x 10-5 m3/s and vertical distribution of suspended sediment ranged from 1-176 mg/L (flood) and 3-198 mg/L (ebb) respectively wherein the sediment transport is strongly controlled by the oceanography conditions (waves, tidal, and longshore current). When the breaking wave crest enhanced, the sediment transport occurs intensely including erosion and sedimentation in the bottom of water. Keywords: Sedimentation rate, numerical model, sediment transport, Brebes waters

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

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

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

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.

Pengaruh Aktifitas Seafloor Fumaroles Terhadap Sebaran Suhu Permukaan dan Kondisi Lingkungan Perairan di Teluk Pria Laot, Pulau Weh Wisnu Arya Gemilang; Ulung Jantama Wisha
Jurnal Segara Vol 15, No 1 (2019): April
Publisher : Pusat Riset Kelautan

Aktifitas vulkanik bawah laut yang ada di kawasan perairan Pulau Weh ditunjukkan dalam bentuk fumaroles, solfatara, lahan panas, mata air panas, kolam lumpur panas dan alterasi sekitar lubang kepundah dasar laut dan pantai. Manifestasi hydrothermal berupa semburan gas vulkanik dan keluaran mata air panas bawah laut mendominasi pada perairan Pulau Weh, terutama pada Teluk Pria Laot. Penelitian ini dilakukan terhadap karakteristik Suhu Permukaan Laut (SPL) menggunakan pendekatan data citra satelit Aqua MODIS dapat memberikan gambaran pengaruh aktifitas mata air panas bawah laut terhadap SPL. SPL di sekitar lokasi keluaran airpanas bawah laut menunjukkan nilai tingggi dibandingkan sekitarnya. Rata-rata SPL pada musim barat 28,94°C, peralihan I 30,52°C, monsun Timur 30,06°C, dan pada musim peralihan II 27,93°C. Musim timur hingga peralihan II memperlihatkan anomali rendahnya suhu sekitar keluaran mata airpanas dibandingkan dengan sekitarnya, yang dipengaruhi oleh faktor meningkatnya curah hujan dan fenomena Transpor Ekman. Fluktuasi SPL pada area sekitar aktifitas seafloor fumaroles mengikuti pola perubahan elevasi pasang-surut. Aktifitas seafloor fumaroles memberikan dampak perubahan karakteristik nilai salinitas, pH serta suhu sekitar Teluk, sehingga banyak biota laut yang tidak dapat hidup di sekitar fumaroles tersebut.

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

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 Guntur Adhi Rahmawan 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 Ulung Jantama Wisha Ulung Jantama Wisha Z Tahir

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