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Sebaran kandungan CO2 terlarut di perairan pesisir selatan Kepulauan Natuna August Daulat; Mariska Astrid Kusumaningtyas; Rizki Anggoro Adi; Widodo Setiyo Pranowo
Depik Vol 3, No 2 (2014): August 2014
Publisher : Faculty of Marine and Fisheries, Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (842.408 KB) | DOI: 10.13170/depik.3.2.1538

Abstract

Abstract. Biogeochemical cycles in coastal ecosystem is influencing the water quality and it is further affect on productivity and sustainability of coastal waters. Carbondioxide is one of the important parameter in biogeochemical cycles in coastal waters, it is formed as DIC (Dissolved Inorganic Carbon) in water and TOC (Total Organic Carbon) in sediment. The purpose of this research was to determine the distribution concentration of dissolved CO2 in the southern coastal waters of Natuna Islands. Insitu measurement was conducted for some parameters of water qualities both physical (i.e. temperature and turbidity) and chemical (i.e. DO, pH and salinity) parameters. DIC was analyzed in LIPI laboratory using Giggenbach titration method, while TOC in sediment was analyzed in Proling Laboratory, Institut Pertanian Bogor. The water quality of the southern coastal waters of Natuna Islands generally in a good condition according to the Ministry of Environment Decree, Number 51, year 2004. The results showed that spacial distribution of DIC ranged from 1.9 to  2.3 mol/kg, while TOC content of the water was ranged from 0.25 g/kg to 1.19 g/kg. Sediment distributions were dominated by sandy, silty sand, sandy silt and coral reefs, therefore the sediment has potencial as organic carbon storage and indicates a good productivity.Keywords: Carbondioxide; Dissolved Inorganic Carbon; Total Organic Carbon; Natuna Islands Abstrak.  Siklus biogeokimia yang terjadi pada ekosistem pesisir dapat mempengaruhi kualitas perairan dan berfungsi sebagai penunjang keberlanjutan dan kesuburan perairan. Karbondioksida adalah salah satu parameter penting dalam siklus biogeokimia di perairan pesisir baik berupa DIC (Dissolved Inorganic Carbon) di dalam air maupun berupa TOC (Total Organic Carbon) di dalam sedimen. Penelitian ini bertujuan untuk mengetahui sebaran kandungan CO2 terlarut di perairan pesisir selatan Kepulauan Natuna. Pengukuran insitu dilakukan terhadap beberapa parameter kualitas air baik fisika (temperatur dan kecerahan) maupun kimia (DO, pH dan salinitas). Metode titrasi Giggenbach digunakan untuk analisis DIC di laboratorium LIPI, sedangkan TOC dalam sedimen dianalisis di laboratorium Proling, IPB. Kualitias air di perairan pesisir selatan Kepulauan Natuna secara umum masih berada dalam kondisi baik berdasarkan Keputusan Menteri Negara Lingkungan Hidup No. 51 tahun 2004. Hasil penelitian menunjukan sebaran spasial parameter kandungan CO2 dengan kandungan DIC berkisar antara 1,9-2,3 mol/kg, sedangkan kandungan TOC perairan berkisar antara 0,25-1,19 g/kg. Sebaran sedimen didominasi oleh pasir, pasir lanau, lanau pasiran dan terumbu karang yang berpotensi besar menyimpan karbon organik didalam sedimennya dan mengindikasikan kesuburan perairan pesisir selatan Kepulauan Natuna tergolong baik.
Ekosistem Lamun sebagai Bioindikator Lingkungan di P. Lembeh, Bitung, Sulawesi Utara Rustam, Agustin; Kepel, Terry L.; Kusumaningtyas, Mariska A.; Ati, Restu Nur Afi; Daulat, August; Suryono, Devi D.; Sudirman, Nasir; Rahayu, Yusmiana P.; Mangindaan, Peter; Heriati, Aida; Hutahaean, Andreas A.
JURNAL BIOLOGI INDONESIA Vol 11, No 2 (2015): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v11i2.2197

Abstract

ABSTRACTSeagrass ecosystem has a function of spawning, nursery, and feeding ground. Besides, it could be used as a bio-indicator of environmental health. This study of seagrass ecosystem was done in 17- 22 May 2014 in Lembeh Island and Tanjung Merah, Bitung. The purpose of the study is to obtain existing condition of seagrass ecosystem and its role as environment bio-indicator. Purposive sampling method was used representing all study sites. Structure analysis of seagrass communities describes the existing condition, while scoring / weighting method estimate current condition of the seagrass. Results that show there are seven species of seagrass. In the stations opposite to Bitung mainland, 75% of the seagrass are Enhalus acoroides (10-50% covers). Importance value index of the seagrass species were Enhalus acoroides (231–300 %), Thalassia hemprichii ( 102–198 %) and Halophila ovalis (110 %) respectively. Based on the weighting method and environmental standard quality, seagrass ecosystem in Lembeh island opposite to Bitung mainland was in damage and unhealthy condition, while seagrass ecosystem opposite to the open sea was in a good and healthy condition. This was due to the domestic waste that is trapped in seagrass ecosystem in the study site. It is necessary to improve awareness to maintain quality of environmental.  Keywords: seagrass, existing, bioindicator, Lembeh Island 
Kualitas perairan Natuna pada musim transisi Mariska Astrid Kusumaningtyas; Rikha Bramawanto; August Daulat; Widodo S. Pranowo
Depik Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Marine and Fisheries, Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1156.73 KB) | DOI: 10.13170/depik.3.1.1277

Abstract

Abstrak. Perairan Natuna, khususnya pada Kawasan Konservasi Laut Daerah (KKLD) I diprioritaskan untuk mendukung kegiatan perikanan berkelanjutan, sehingga penting diketahui kualitasperairannya. Penelitian ini bertujuan untuk mengetahui karakteristik kualitas air berdasarkan parameter fisika maupun kimia sebagai basis data terkini mengenai kualitas perairan Natuna pada musim transisi. Penelitian dilakukan di 31 stasiun pada bulan November 2012. Parameter kualitas air yang diukur antara lain kecerahan, derajat keasaman (pH), oksigen terlarut, suhu, salinitas, padatan tersuspensi total atau Total Suspended Solids (TSS) dan nutrien (nitrat, fosfat, silikat). Parameter pH, oksigen terlarut, suhu, dan salinitas diukur secara in-situ menggunaan alat water quality meter (TOA-DKK), kecerahan diukur menggunakan secchi disk, sedangkan sampel air di bawa ke laboratorium untuk dianalisis konsentrasi nutrien dan TSS. Hasil penelitian menunjukkan nilai kisaran kecerahan yaitu 2-20,9 (m), pH 8,09-8,27, oksigen terlarut 6,34-7,96 (mg/l), suhu 29,2-30,6 (°C), salinitas 27,9-30,4 (PSU), TSS 3-26 (mg/l), nitrat 0,005-0,078 (mg/l), fosfat 0,005-0,015 (mg/l) dan silikat 0,045-0,704 (mg/l). Hasil penelitian dibandingkan dengan baku mutu air laut untuk biota laut berdasarkan Keputusan Menteri Lingkungan Hidup Nomor 51 Tahun 2004. Berdasarkan hasil penelitian, kondisi perairan Natuna masih tergolong baik untuk menunjang kehidupan biota laut.Kata kunci: Parameter kimia; Parameter fisika; Natuna; musim transisi
EKOSISTEM LAMUN SEBAGAI BIOINDIKATOR LINGKUNGAN DI P. LEMBEH, BITUNG, SULAWESI UTARA Rustam, Agustin; Kepel, Terry L.; Kusumaningtyas, Mariska A.; Ati, Restu Nur Afi; Daulat, August; Suryono, Devi D.; Sudirman, Nasir; Rahayu, Yusmiana P.; Mangindaan, Peter; Heriati, Aida; Hutahaean, Andreas A.
JURNAL BIOLOGI INDONESIA Vol 11, No 2 (2015): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v11i2.2197

Abstract

ABSTRACTSeagrass ecosystem has a function of spawning, nursery, and feeding ground. Besides, it could be used as a bio-indicator of environmental health. This study of seagrass ecosystem was done in 17- 22 May 2014 in Lembeh Island and Tanjung Merah, Bitung. The purpose of the study is to obtain existing condition of seagrass ecosystem and its role as environment bio-indicator. Purposive sampling method was used representing all study sites. Structure analysis of seagrass communities describes the existing condition, while scoring / weighting method estimate current condition of the seagrass. Results that show there are seven species of seagrass. In the stations opposite to Bitung mainland, 75% of the seagrass are Enhalus acoroides (10-50% covers). Importance value index of the seagrass species were Enhalus acoroides (231?300 %), Thalassia hemprichii ( 102?198 %) and Halophila ovalis (110 %) respectively. Based on the weighting method and environmental standard quality, seagrass ecosystem in Lembeh island opposite to Bitung mainland was in damage and unhealthy condition, while seagrass ecosystem opposite to the open sea was in a good and healthy condition. This was due to the domestic waste that is trapped in seagrass ecosystem in the study site. It is necessary to improve awareness to maintain quality of environmental.  Keywords: seagrass, existing, bioindicator, Lembeh Island 
Dinamika Struktur Komunitas Lamun Kepulauan Karimunjawa, Kabupaten Jepara Agustin Rustam; Yusmiana Puspita Rahayu Ningsih; Devi Dwiyanti Suryono; August Daulat; Hadwijaya Lesmana Salim
Jurnal Kelautan Nasional Vol 14, No 3 (2019): DESEMBER
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jkn.v14i3.7761

Abstract

Salah satu faktor yang mempengaruhi struktur komunitas lamun adalah kondisi lingkungan tempat lamun tumbuh yang dipengaruhi musim. Penelitian ini dilakukan tahun 2016 dan 2018 di perairan kepulauan Karimunjawa, Kabupaten Jepara, Jawa Tengah. Tujuan penelitian ini mendapatkan dinamika kondisi eksisting ekosistem lamun melalui pendekatan struktur komunitas di empat pulau dan monitoring di dua pulau pada dua musim yang berbeda. Metode penelitian dilakukan dengan survei lapangan, penentuan titik sampling secara purposive sampling dan dianalisis struktur komunitas lamun serta metode skoring/bobot untuk mengestimasikan kondisi lamun. Hasil penelitian ada sepuluh spesies lamun yang ditemukan di empat pulau dengan 15 titik sampling. Dua pulau dilakukan monitoring terlihat adanya kecenderungan penurunan prosentase penutupan lamun dan berkurangnya spesies lamun namun ada peningkatan keanekaragaman lamun berdasarkan jumlah individu yang ditemukan. Jenis lamun yang berperan penting di Kepulauan Karimunjawa adalah jenis Thalassia  hemprichii, Cymodocea rotundata dan Enhalus acoroides. Peningkatan jumlah individu lamun dikarenakan adanya pergantian peran lamun di lokasi monitoring dengan lamun yang  berukuran lebih kecil dari sebelumnya. Berdasarkan sistem pembobotan dan baku mutu kondisi lingkungan  ekosistem lamun rata-rata menunjukkan kondisi dalam keadaan rusak, kurang kaya dan kurang sehat. Hal ini dapat disebabkan ada potensi pencemaran limbah domestik yang  terperangkap di ekosistem lamun sehingga terjadi penurunan struktur komunitas lamun, ditunjukkan dengan adanya hamparan makro alga di beberapa lokasi, mengindikasikan adanya pengayaan nutrien. Diperlukan pemantauan yang berkelanjutan untuk ekosistem lamun, dan kesadaran masyarakat untuk tidak membuang sampah ke laut, sehingga lingkungan perairan terjaga dengan baik. 
DETERMINING THE CAPACITY OF TEMPORARY EVACUATION SHELTER IN CARITA AND LABUAN DISTRICT PANDEGLANG REGENCY Dini Purbani; Muhammad Ramdhan; Hadiwijaya Lesmana Salim; August Daulat; Aida Heriati; Budianto Ontowirjo; Ardiansyah Ardiansyah
Jurnal Segara Vol 18, No 1 (2022): April
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i1.10544

Abstract

In Labuan and Carita district, which is on the coast of Pandeglang Regency, there was a tsunami due to the GAK landslide on December 22, 2018. The disaster resulted in the death of 431 people, more than 7200 injured and 46,646 people lost their homes. To anticipate the number of disaster victims, disaster mitigation efforts are carried out using network analysis applications from GIS (Geographical Information Systems) software. The data used in the network analysis process is road data obtained from the Open Street Map in 2019 and strengthened by the propagation time and speed time to TES. This study used a walking speed of 0.751 m/second for group parents. The results of the network analysis process show the best route to the proposed Temporary Evacuation Place (TES). Carita TES The TES proposed in Carita District from the analysis results provided eight TES proposals located on Raya Anyer Sirih Street. The number of residents in each area segment in the proposed TES has a capacity of between 179 and 2,677 people. Four existing TES units in Carita District which are located on Perintis Kemerdekaan Street. Labuan district are proposed for 1 unit of TES, the total population in this segment has a capacity of 4,376 people. The existing TES is in the form of a Tsunami Shelter Building, the number of residents in this segment has a capacity of 23, 635 people. 
Cadangan Karbon Ekosistem Mangrove di Sulawesi Utara dan Implikasinya Pada Aksi Mitigasi Perubahan Iklim Terry Louise Kepel; Restu Nur Afi Ati; Agustin Rustam; Yusmiana Puspitaningsih Rahayu; Mariska Astrid Kusumaningtyas; August Daulat; Devi D. Suryono; Nasir Sudirman; Novi Susetyo Adi; Desy Maria Helena Mantiri; Andreas Albertino Hutahaean
Jurnal Kelautan Nasional Vol 14, No 2 (2019): AGUSTUS
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (455.705 KB) | DOI: 10.15578/jkn.v14i2.7711

Abstract

Sulawesi Utara adalah salah satu provinsi yang menerapkan kebijakan rencana aksi nasional/daerah (RAN/RAD) gas rumah kaca sebagai bagian dari usaha nasional dalam mitigasi perubahan iklim. Salah satu kegiatan mitigasi berbasis lahan di Sulawesi Utara adalah pengukuran dan monitoring biomas dan stok karbon di hutan termasuk hutan pantai yang luasan pengukuran masih terbatas. Pada tahun 2013-2015, Tim Penelitian Karbon Biru melakukan penelitian di empat lokasi di Sulawesi Utara yang bertujuan untuk menganalisis kondisi ekologis dan kemampuan ekosistem pesisir terutama mangrove dalam menyimpan karbon serta implikasi pada mitigasi gas rumah kaca. Lokasi penelitian terletak di Ratatotok – Kabupaten Minahasa Tenggara, Kema – Kabupaten Minahasa Utara, Pulau Lembeh – Kota Bitung dan  Pulau Sangihe – Kabupaten Sangihe. Jenis mangrove yang teridentifikasi adalah 17 spesies dan 3 spesies diantaranya yaitu B. gymnorrhiza, R. mucronata dan S. alba ditemukan di semua lokasi. Keanekaragaman spesies berkisar dari rendah sampai sedang dan penyebaran spesies tidak merata.  Kapasitas penyimpanan karbon adalah sebesar 343,85 Mg C ha-1 di Ratatotok, 254,35 Mg C ha-1 di Lembeh, 387,95 Mg C ha-1 di Kema, dan 594,83 Mg C ha-1 di Sangihe. Lebih dari 59% simpanan karbon berada pada sedimen. Nilai rata-rata simpanan karbon di keempat lokasi penelitian sebesar 456,86 M C ha-1 atau 5,70 Tg C setelah dikonversi dengan luas total ekosistem mangrove Sulawesi Utara. Nilai ini setara dengan penyerapan CO2 dari atmosfer sebesar 20,70 Tg CO2e. Potensi emisi akibat perubahan lahan mangrove mencapai 0,42 Tg CO2e. Upaya meningkatkan kontribusi penurunan emisi Sulawesi Utara dapat dicapai dengan melakukan intervensi pengurangan emisi melalui rehabilitasi dan konservasi ekosistem mangrove.
Hydro-Oceanographic Characteristics In Karimunjawa Coastal Waters During The 1st Transitional Season Yulius Yulius; Joko Prihantono; Dino Gunawan; Muhammad Ramdhan; August Daulat; Nur Kholik Kurniana Putra
Jurnal Segara Vol 17, No 2 (2021): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v17i2.9839

Abstract

This study aims to determine oceanographic characteristics such as tides, waves, and currents in Karimunjawa Coastal Waters during the 1st transitional season and to update the oceanographic database for spatial management evaluation in the region. The tidal characteristics were obtained from the least square method analysis using World Tide software based on Matlab programming language, while wave and current characteristics obtained from 2-dimensional numerical modeling using Mike 21 software on the flow model and spectral wave module. The primary data used were the significant wave height (Hs), wave peak period (Tp), and ocean current components (u and v velocity) on 13-26 May 2016 using the Sontex Argonaut XR type Acoustic Doppler Current Profiler (ADCP) equipment. Tide data were predicted for the Kemujan Islands station from 1-31 March 2020. Secondary data for additional numerical model input were obtained from ERA5-reanalysis in the form of Hs, Tp, u, and v wind velocity data for May 2020 with a temporal resolution of 20 minutes, while bathymetry data derived from GEBCO Satellite Derivated Bathymetry (SDB) data. The tide analysis results showed that Karimunjawa waters are a single daily mixed tidal type. The wave characteristic moves from east to west with high waves reached 0.9 meters and a peak period of 7 seconds. The eastern side of Karimunjawa Island, Kemujan Island, and the western area have a calmer wave. The current characteristic moves northeastward with a speed of 5-28 cm/s, which concludes that in several locations, such as the Menjangan Besar-Menjangan Kecil strait, the currents depend on the tidal conditions.