Abstract. Simeulue Island is situated Indian Ocean in western part of Aceh Province, this is one of the outer island in Indonesia.Simeulue has big potency in marine resources such as clean waters and beautiful beach, coral showed that the water quality of Ganting Beach is very suitable for recreational activities (index 77, category S1) and it is suitable for swimming and also for boating tourism activities, banana boats and jet skis (index 16, category S2). Keywords: water quality; marine tourism; Ganting BeachAbstrak. Pulau Simeulue, merupakan salah satu pulau terdepan sebelah barat Negara Kesatuan Republik Indonesia (NKRI), dan terletak di Samudera Hindia.Simeulue memiliki potensi sumberdaya laut yang besar, diantaranya perairan yang besih dan jenih, pantai yang indah, terumbu karang dan hutan bakau, sehingga sangat berpotensi untuk dikembang menjadi tujuan wisata. Penelitian ini bertujuan untuk menilai kondisi kualitas perairan dan potensi kesesuaian wisata Pulau Simeulue.Penelitian ini dilaksanakan pada bulan Agustus 2015 bertempat di Pantai Ganting, Kelurahan Kuala Makmur, Kabupaten Simeulue. Sebanyak 12 lokasi pengambilan sampel kualitas air ditetapkan secara purposive random sampling. Kualitas air yang diukur meliputi; pH, suhu, salinitas, kekeruhan, oksigen terlarut, kecerahan, BOD5, bau, lapisan minyak dan sampah. Data tersebut kemudian dipetakan dan dianalisis menggunakan software Ocean Data View (ODV), kemudian dibandingkan dengan baku mutu air laut untuk wisata bahari serta karakteristik pantai untuk indeks kesesuaian kawasan wisata rekreasi. Hasil penelitian menunjukkan bahwa kualitas perairan Pantai Ganting sangat sesuai untuk kegiatan rekreasi dan berenang (indeks 77, kategori S1) dan sesuai untuk kegiatan wisata berperahu, banana boat dan jet ski (indeks 16, kategori S2). Kata kunci: kualitas perairan; wisata bahari; Pantai Ganting PendahuluanPulau Simeulue, Provinsi Aceh merupakan salah satu pulau terdepan sebelah barat Indonesia. Pulau ini terletak di Samudera Hindia dan terpisah 150 km dari daratan Provinsi Aceh di Pulau Sumatera. Pulau Simeulue memiliki luas wilayah 2.130 km 2 dan merupakan salah satu kabupaten hasil pemekaran dari Kabupaten induk Aceh Barat. Pulau Simeulue memiliki potensi suberdaya pesisir dan perairan yang besar diantaranya terumbu karang, hutan bakau, perairan yang bersih dan jernih dengan biota laut antara lain ikan, rumput laut, lobster, kepiting dan teripang (Nazaruddin et al., 2015). Pulau Simeulue merupakan salah satu kawasan yang terkena dampak tsunami atau smong (nama lokal untuk tsunami) tahun 2004. Perubahan mencolokpasca tsunami adalah terjadinya akresi pada sebagian besar pantai seperti di daerah sekitar barat laut hingga ke arah timur laut, yang ditandaidengan semakin melebarnya pantai ke arah laut karena terangkatnya dasar laut ke permukaan akibat pergerakan lempeng tektonik subduksi Busur Sunda (Natawidjaja, 2007). Kondisi ini memiliki dampak positif diantaranya makin bertambahnya luas kawasan pantai yang dapat dimanfaatkan oleh masyarakat untuk memperlu...

Perairan Keneukai merupakan salah satu penghasil sumber daya perikanan di Pulau Weh, Nanggroe Aceh Darussalam. Jumlah spesies ikan di perairan tersebut mengalami penurunan dari tahun 2008 hingga 2010. Penelitian yang dilakukan oleh Loka Riset Sumber Daya dan Kerentanan Pesisir (LRSDKP) pada tahun 2017 mempunyai salah satu tujuan untuk menentukan lokasi yang tepat untuk usaha budidaya perairan Keramba Jaring Apung (KJA) lepas pantai di Perairan Keneukai. Analisis yang dilakukan dalam penelitian ini adalah analisis arus, pasang surut, batimetri, serta kualitas perairan. Kecepatan arus di permukaan berkisar antara 0-0,9 m/s. Sementara itu, kecepatan arus dekat dasar berkisar antara 0-0,74 m/s. Profil vertikal arus menunjukkan mekanisme Spiral Ekman yang berpengaruh terhadap distribusi material-mateial organik secara vertikal dan didominasi oleh arus pasang surut. Topografi Perairan Keneukai termasuk landai dengan kedalaman berkisar 0-72 meter dan terdapat perubahan kedalaman yang signifikan di sejumlah area. Hasil analisis perairan untuk parameter Dissolved Oxygent (DO), salinitas, suhu, pH, kecerahan, nitrit, Biological Oxygent Demand (BOD dan amonia menunjukkan bahwa lokasi penelitian layak dan sesuai untuk dijadikan sebagai tempat budidaya KJA. Akan tetapi, hal tersebut tidak berlaku untuk parameter nitrat. Berdasarkan hasil analisis dan verifikasi lapangan dengan pertimbangan aspek fisik dan keterjangkauan lokasi, maka Perairan Keneukai dapat direkomendasikan untuk pengembangan budidaya keramba jaring apung.

<p>Pesisir Kecamatan Sayung merupakan wilayah abrasi di Kabupaten Demak yang terkena dampak paling parah dari kenaikan muka air laut. Tujuan penelitian ini untuk mengetahui dinamika gelombang yang terjadi pada setiap kondisi pasang surut dan pengaruhnya terhadap rob serta <em>overtopping</em> yang terjadi. Metode penelitian adalah deskriptif kuantitatif menggunakan persamaan numerik, simulasi MIKE 21 dan model elevasi ArcGis. Hs tahun 2016 pada pasang purnama 0,015 – 0,359 m dan pada surut purnama 0,009 – 0,358 m. Hasil pengolahan data menunjukkan ada perbedaan yang drastis genangan yang terjadi pada saat pasang dan surut. Luas area model genangan rob pada tahun 2016 sebesar 7200,36 Ha. Untuk jarak terjauh genangan rob dari garis pantai pada tahun 2016 sejauh 10826,7 m. Terdapat peningkatan tinggi gelombang termasuk kondisi pasut purnama dan perbani tiap tahunnya. Hal ini menunjukkan abrasi terjadi di pengaruhi oleh kikisan gelombang yang terjadi secara terus-menerus. Kenaikan muka air laut yang terjadi setiap tahunnya berbanding terbalik dengan luas genangan yang dihasilkan, sehingga perlu dilakukan tindakan yang preventif pada proses tata kelola ruang pesisir. </p><p> </p><p><strong>Kata kunci</strong><em>:</em><em> </em><em>model elevasi, gelombang, model numerik, banjir rob, Sayung</em></p><p><em><br /></em></p><p class="ColorfulList-Accent11" align="center"><strong><em>NUMERICAL SIMULATION OF SPECTRAL WAVES AND ROB DISASTER USING FLEXIBLE MESH AND DATA ELEVATION MODEL IN WATERS OF SAYUNG DISTRICT, DEMAK</em></strong><strong><em></em></strong></p><pre><em>Coastline area in subdistrict Sayung is an abrasion area in Demak which has the worst affected of sea level rise. The purpose of this study to determine the wave dynamics that occur in any tidal conditions and their effects on tidal flood and overtopping happened. The research method is quantitative descriptive using numerical equations, MIKE 21 simulation and ArcGIS elevation models. Hs 2016 on a tide 0.015 to 0.359 m and in full retroactively from 0.009 to 0.358 m. The results of data processing showed no drastic difference puddle that occur at high tide and low tide. The area of tidal inundation model in 2016 amounted to 7200.36 Ha. To the farthest distance from the shoreline tidal inundation in 2016 with a distance of 10826.7 m. There are an increasing wave heights including a full moon and neap tide conditions each year. This shows abrasion occurs is influenced by the piling up of waves that occur continuously. Sea level rise that occurs annually is inversely proportional to the resulting inundation area, so we need a preventive action on the processes of governance of coastal areas.</em></pre><pre> </pre><pre><strong>Keywords</strong><em>: elevation models, waves, numerical models, tidal flood, Sayung</em></pre><p><em><br /></em></p>

Ambon Bay is divided by two thresholds, namely Teluk Ambon Dalam and Teluk Ambon Luar. Ambon bay is rich in marine potential both the unique of fisheries and coral reefs as well as the

Some efforts have been done to cope with coastal erosion and rob in Sayung Coast including mangrove plantation, hybrid engineering (HE), and hard structure protection. However, those efforts are not considered to be the best solution in reducing the impacts of the hazards. This study aimed to determine the sediment accumulation rates based on natural isotopes 210 Pb dating and hydro-oceanographic modeling technique. According to 210 Pb analysis, we calculated the sediment accumulation rates at Surodadi and Timbulsloko of 0.145 cm/year and 0.06 cm/year, respectively. The sediment compositions are dominated by terrestrial sediment typified by clay deposits. The sedimentary rate average of Sayung Coast prior to HE installation (2011-2013) was 0.195 cm/year. The rate of sediment accumulation rose to around 0.4 cm/year in 2016 in accordance with the increase of Mangrove area from around 409 hectares in 2013 to about 455.79 hectares in 2015. The increase of sedimentary rate recent years became an evidence that mitigation efforts to reduce abrasion temporarily succeeded.

Sabang coastal bay becomes the area of significance where the development centered in the semi-enclosed area. Sabang Bay is well-known as the center of marine economy (Aquaculture, Harbor, and marine tourism). Recently, there is a planning initiated by Ministry of Marine Affairs and Fisheries (MMAF) to install the floating fish cage aquaculture (KJA) in the offshore area of Sabang Bay which the planning becomes a controversy between local people, local government, and researchers as well. This study aims to evaluate and discuss the impacts that will be happened if KJA is applied. Field surveys on hydro-oceanography aspects were done measuring currents, tides, waves, winds, bathymetry, water quality, as well as tourism condition. Based on those hydro-oceanography conditions, Sabang Bay categorized into calm water area where the sea current is weak (ranging from 0-0.12 m/s), whilst the high values of pH, salinity, and temperature are identified within the bay during low tidal condition. If KJA is installed within the bay, automatically it will pollute the water due to the accumulation of remaining fish feeder wastes. Moreover, within the bay, there are several attractive marine tourisms such as diving sites, the conservation area of Sophie Rickmers shipwreck site, and hot bubble (fumaroles hydrothermal vent). The presence of KJA will possibly disrupt marine tourism activities so that the implementation of KJA needs to be considered the impacts before installation.

The waters of Weh Island, Aceh Province has potency become the area for offshore aquaculture. Offshore Floating Net Cages can be an appropriate technology in increasing the biomass cultivation in Weh Island waters. However, no feasibility study has been done.  Therefore, this study aims to examine the suitability of offshore aquaculture locations in the East and South regions of Weh Island Based on Hydro-oceanography parameters. The parameters examined were water quality parameters such as temperature, brightness, pH, salinity and dissolved oxygen. In addition, we also examined the aspects of physical oceanography such as tides, currents and bathymetry. The results show that the water depth ranged from 0-57 m. The tidal type in the Weh Island waters is mixed tide prevailing semidiurnal with the tidal range of 1.9 m. The average of current speed ranged from 19.03-37.67 cm/s with the directions predominantly toward northwest and southeast.  It is concluded that the water quality data show that the eastern and southern parts of Weh Island are categorized as the feasible locations for offshore aquaculture.  Keywords: Sabang, Hydro-oceanography, Fisheries, Offshoreaquaculture, Floating net cages

Abrasion which is occurred in the Sayung coast is triggered by a big role of climate change as well as the sea level rise and land subsidence. Resulting degradation ultimately affects changes in existing environmental conditions. This study has aim to determine the existing water based on biological and chemical content which is affected by increasing suspended solid content in the Sayung waters. Purposive sampling technique was applied, and data is analyzed both statistically and spatially. Suspended solid value has ranged 23,1-199,6 mg/L. Distribution of suspended solid was only simulated during low tide towards high tide phase with current speed has ranged 0-0.41 m/s. We found that dissolved oxygen value is quite high in several observation stations which indicates the fertile area with low pollution and blooming tendency. In the station which is dominated by a high suspended solid and turbidity found that the chlorophyll-a decreases. The increased rate of suspended solid is directly enhancing the turbidity and indirectly declines the photosynthesis activity and inhibits the oxygen cycle. Resulting in the primary productivity reduction in the Sayung waters