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Yulius Yulius

Pusat Riset Kelautan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan, Kemeneterian Kelautan Perikanan . Komplek Bina Samudera Jl. Pasir Putih II Lantai 4, ancol timur, Jakarta Utara 14430

Author-ID : 4028189

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology

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Articles

Budi daya Rumput Laut dan Pengelolaannya di Pesisir Kabupaten Dompu, Provinsi Nusa Tenggara Barat Berdasarkan Analisa Kesesuaian Lahan dan Daya Dukung Lingkungan Yulius Yulius; Muhammad Ramdhan; Joko Prihantono; Dino Gunawan Pryambodo; Dani Saepuloh; Hadiwijaya Lesmana Salim; Irfan Rizaki; Ranela Intan Zahara
Jurnal Segara Vol 15, No 1 (2019): April
Publisher : Pusat Riset Kelautan

Rumput laut (makro alga) merupakan salah satu komoditas sumber daya pesisir yang mermiliki potensi ekonomis, mudah dibudidayakan dengan biaya produksi yang rendah. Perairan Kabupaten Dompu Provinsi, Nusa Tenggara Barat (NTB) merupakan kawasan memiliki beragam sumber daya hayati pesisir dan laut (SDHPL), diantaranya rumput laut jenis Eucheuma cottoni dan Kappaphycus alvarezii yang merupakan rumput laut dari 5 jenis yang dimanfaatkan dan dibudidayakan di Indonesia, namun data dan informasi yang menunjang usaha budidaya rumput laut di Kabupaten Dompu masih sangat minim. Tujuan dari penelitian ini adalah mengetahui kesesuaian perairan dan menduga daya dukung lingkungannya untuk budidaya rumput laut di Kabupaten Dompu. Metode spasial, yaitu metode untuk mendapatkan informasi pengamatan yang dipengaruhi efek ruang digunakan dalam kajian ini. Pengaruh efek ruang tersebut disajikan dalam bentuk pembobotan. Parameter unsur hara, yaitu Nitrogen (N) dan Phosfat (P) digunakan sebagai dasar untuk menghitung daya dukung lingkungan. Hasil penelitian menunjukkan bahwa luas area yang sesuai untuk budidaya rumput laut sekitar 72.515 ha atau 99,49 % dari luas total wilayah kawasan yang dikaji. Luas area budidaya rumput laut yang telah dimanfaatkan hingga saat ini adalah 500 ha atau 3,3 % dari total luasan daya dukung, sehingga luas area yang belum termanfaatkan adalah 14.719 Ha atau 66,7 % dari total luasan daya dukung. Skenario ideal pengembangan usaha budidaya rumput laut yaitu; melalui penambahan bibit unggul dan informasi musim tanam serta melaksanakan budidaya secara optimal sehingga potensi ekonomi pertahun dapat tercapai.

Abrasi dan Akresi Berdasarkan Longshore Sediment Transport dan Perubahan Garis Pantai: Studi Kasus Pantai Pulau Cemara Besar, Karimunjawa Yulius Yulius; Nur Kholik Kurniana Putra; Muhammad Ramdhan; Baskoro Rochaddi
Jurnal Segara Vol 16, No 3 (2020): Desember
Publisher : Pusat Riset Kelautan

Pulau Cemara Besar merupakan pulau yang direncakan menjadi kawasan ekowisata bahari di Kepulauan Karimun Jawa menurut Kementerian Kelautan dan Perikanan. Oleh karenanya analisis geologi dan oseanigrafi pesisir diperlukan untuk pengambilan keputusan. Penelitian ini dilaksanakan untuk mengkaji transport sedimen sejajar pantai dan garis pantai yang diakibatkannya. Perubahan garis pantai diperoleh dari analisis DSAS menggunakan citra Sentinel 2A selama tahun 2016 – 2020 dan tracking garis pantai menggunakan GPS geodetic pada Maret 2020. Parameter inputan transport sedimen sejajar pantai diperoleh dari data model reanalysis ERA-5 yang selanjutnya dilakukan peramalan gelombang dengan metode SMB dan analisis gelombang representatif. Ukuran butir sedimen diambil di sepanjang pantai sebanyak 14 titik dan dilakukan analisis granulometri untuk mengetahui besar d50 sedimen. Trasnport sedimen sejajar pantai diprediksi menggunakan persamaan empiris dari CERC, Walton Jr, dan Kamphuis. Berdasarkan hasil penelitian didapatkan bahwa transport sedimen sejajar pantai menyebabkan abrasi di ekor pulau sebelah timur dan pangkal pulau selatan serta akresi di ekor pulau utara dan pangkal pulau sebelah timur yang dicirikan dengan adanya perubahan garis pantai di lokasi tersebut. Analisis regresi linier menunjukan laju LST di sepanjang pantai berpengaruh sebesar 13.83% terhadap perubahan garis pantai.

Assessment of Mangrove Ecosystem Potency and Its Utilization in Dompu Regency Coastal Waters, West Nusa Tenggara Province Using Satellite Imagery Application Yulius Yulius; Syahrial Nur Amri; August Daulat; Sari Indriani Putri
Jurnal Segara Vol 15, No 2 (2019): Agustus
Publisher : Pusat Riset Kelautan

Mangrove ecosystem forests are tropical coastal vegetation communities, which has the ability to grow in coastal area with tidal and muddy environment. Several functions of mangrove ecosystem forest such as ecological functions can be used for coastal protection, trapping sediment and strengthen the coastal ecosystems. Coastal waters in Dompu Regency, West Nusa Tenggara have natural mangrove ecosystem with a huge potency and advantages to the region. This study aimed to understand the condition of mangrove ecosystem based on satellite image analysis of Landsat 8 Operational Land Imager (OLI) in 2014 and assess the potency, information related to the utilization by community. Data collection in this study were combined from satellite imagery interpretation with interview and questionnaires. The results showed that the mangrove forest extent in Dompu Regency Coastal Waters were about 90,631 ha with uniformity index 0.68 (medium uniformity). Two mangrove species were found in the region namely Rhizopora stylosa and Rhizopora apiculata and used by the community for several purposes such as firewood, natural coastal protection from tidal, waves and abrasion, also for crabs and fish spawning ground.

KAJIAN KUALITAS PERAIRAN UNTUK BUDIDAYA LAUT DI TELUK SALEH, KABUPATEN DOMPU yulius yulius; Aisyah Aisyah; Joko Prihantono; Dino Gunawan
Jurnal Segara Vol 14, No 1 (2018): April
Publisher : Pusat Riset Kelautan

Teluk Saleh terletak di sebelah timur laut Pulau Sumbawa, Nusa Tenggara Barat (NTB). Secara administratif, Teluk Saleh berada di dua kabupaten, yaitu Kabupaten Sumbawa dan Kabupaten Dompu. Teluk Saleh merupakan pusat kegiatan perekonomian laut yang dimanfaatkan sebagai lahan budidaya laut seperti budidaya rumput laut dan budidaya keramba jaring apung (KJA). Penelitian ini dilakukan pada tanggal 19 – 25 Mei 2016 di perairan Teluk Saleh, Kabupaten Dompu, NTB. Tujuan penelitian ini adalah untuk memperoleh variabilitas parameter kualitas air untuk budidaya laut. Pengambilan data kualitas perairan dilakukan secara purposive sampling dengan menggunakan alat multiparameter WQC-24. Parameter yang diukur yaitu parameter fisika; kecepatan arus, padatan tersuspensi (TSS), padatan terlarut (TDS), kecerahan, kekeruhan, dan suhu. Parameter kimia; kebutuhan oksigen biologis (BOD), oksigen terlarut (DO), derajat keasaman (pH), kadar amonia, dan unsur hara (Nitrat-NO3, Fosfat PO4 dan Klorofil-a). Analisis data dilakukan secara deskriptif menggunakan analisis PCA (Principal Component Analysis). Hasil analisis data menunjukan bahwa suhu, salinitas, DO, dan pH berada pada ambang normal antara 25 - 31 oC, 32 – 34 ppt, 5mg/l dan 8, yang artinya bahwa perairan di daerah penelitian secara umum tergolong perairan dengan produktifitas yang tinggi. Terdapat beberapa parameter yang masih melebihi baku mutu untuk budidaya laut yaitu parameter fosfat dan nitrat. Nilai konsentrasi nitrat kurang dari 0.1mg/l diduga sebagai akibat dari aktivitas perekonomian masyarakat di sekitar muara sungai yang membuang limbah ke perairan. Berdasarkan analisa PCA didapatkan parameter yang berperan kuat di lokasi adalah arus dan TSS.

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

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.

CHARACTERISTIC OF SALEH BAY COASTLINE Yulius Yulius; Muhammad Ramdhan; Ardiansyah Ardiansyah
Jurnal Segara Vol 14, No 2 (2018): Agustus
Publisher : Pusat Riset Kelautan

Indonesia is an archipelagic country with numbers of natural resources including bays. As a closed estuary, bay has a strategic role as one of the ecological resources and environmental services. Saleh Bay is an outstanding bay of West Nusa Tenggara province which is situated between Sumbawa regency and Dompu regency. The study aimed to explain the criteria for the determination of a bay based on UNCLOS and bathymetry system by using Geographic Information System (GIS). The results of the identification indicated that the Ocean Map issued by Dishidros had not entirely referred to the criteria of UNCLOS in determining an area as a bay, in which an indentation is regarded as a bay if its total area is larger than the area of t he semi-circle whose diameter is a line drawn across the mouth of that indentation. Subsequently, spatial analysis found out that the depth of the waters in Saleh Bay can be classified into eleven classes, which are: (1) 0 – 10 meter with area of 294.27 km2, (2) 10 - 20 meter with area of 205.45 km2, (3) 20 - 30 meter with area of 259.45 km2, (4) 30 - 40 meter with area of 146.25 km2, (5) 40 - 50 meter with area of 137,83 km2, (6) 50 - 60 meter with area of 148.19 km2, (7) 75 - 100 meter with area of 57.08 km2, (8) 100 - 150 meter with area of 73.78 km2, (9) 150 - 200 meter with area of 109.46 km2, (10) 200 - 300 meter with area of 533.42 km2 , and(11) >300 meter with area of 134.89 km2.

The Existence of Ornamental Coral in Different Live Coral Coverage Condition in Saleh Bay, West Nusa Tenggara Ofri Johan; Yulius Yulius; Hadiwijaya Lesmana Salim; Idil Ardi; Muhammad Abrar; August Daulat
Jurnal Segara Vol 15, No 2 (2019): Agustus
Publisher : Pusat Riset Kelautan

Ornamental coral is one of the trading commodities targets with high demand in all of the world because of its color and unique shape. Various types of ornamental corals are usually found in a specific area and out of reach, where one of them situated in water depth that it so difficult to find. West Nusa Tenggara Province is known as one of the ornamental coral suppliers that has not been touched much by research related to the existence of ornamental coral natural resources. This study aims to obtain preliminary data on the existence of ornamental coral, especially in Saleh Bay waters. Observations carried out from 6 to 11 May 2015 at 6 locations, determined based on distance from the mainland with respective representation, which divided into categories such as near, medium and far using the straight-line transect methods for coral reefs condition, while belt transect methods used for ornamental corals assessment. The results showed the health of coral reefs in good condition with the cover above 50% at all stations except station 4 (medium category), where Acropora coral species dominated at stations 5 and 6 (distant category). The bottom substrate dominated by coral fragments and dead corals with algae (DCA), which are found 28 genera of ornamental corals and considered as trade commodities such as Euphyllia glabrescens, Euphyllia cristata, Euphyllia ancora, Echinophora sp, Gonioporasp, Lobophyllia sp, Physogyra sp, Merulina sp, and Turbinaria sp. The research location can be used as a permanent study area for ornamental coral focus subject and as an indicator for sustainable ornamental coral management in the region.

Co-Authors Aisyah Aisyah Ardiansyah Ardiansyah August Daulat August Daulat Baskoro Rochaddi Dani Saepuloh Dino Gunawan Dino Gunawan Dino Gunawan Pryambodo Hadiwijaya Lesmana Salim Idil Ardi Irfan Rizaki Joko Prihantono Joko Prihantono Muhammad Abrar Muhammad Ramdhan Muhammad Ramdhan Nur Kholik Kurniana Putra Nur Kholik Kurniana Putra Ofri Johan Ranela Intan Zahara Sari Indriani Putri Syahrial Nur Amri

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