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All Journal Journal of Oceanography Journal of Marine Research Indonesian Journal of Oceanography
Jarot Marwoto
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Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Environmental Science

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Journal : Journal of Marine Research

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Geomorfologi Perairan Muara Sungai Kaliboyo Batang Jawa Tengah Shofian, Tyandi; Atmodjo, Warsito; Marwoto, Jarot
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (971.338 KB) | DOI: 10.14710/jmr.v8i4.25412

Abstract

ABSTRAK : Sungai Kaliboyo merupakan salah satu daerah aliran sungai (DAS) yang ada di Kabupaten Batang. Muara Sungai Kaliboyo terletak di Desa Roban, dimana mayoritas masyarakat memanfaatkan sebagai sarana transportasi dan sumber mata pencaharian. Perairan yang dulu digunakan sebagai jalur transportasi kini mengalami perubahan berupa pendangkalan pada aliran muara, sehingga berdampak pada terhambatnya aktivitas nelayan khususnya alur keluar masuk kapal. Informasi geomorfologi ialah hal vital untuk perencanaan dan pemanfaatan perairan di masa mendatang salah satunya pengerukan. Tujuan dari penelitian ini untuk mengetahui kondisi geomorfologi perairan Muara Sungai Kaliboyo, Kabupaten Batang. Penelitian ini dilakukan dengan pemeruman kedalaman menggunakan instrumen singlebeam echosounder tipe Garmin GPSMap 585 untuk mengetahui kedalaman perairan, serta grab sampler untuk mengambil sampel sedimen dasar. Pengolahan data diproses dengan menggunakan software ArcGIS 10.4 dan Surfer 11 untuk mendapatkan hasil kontur batimetri dan persebaran sedimen guna mengetahui kondisi geomorfologi. Berdasarkan hasil penelitian, menunjukkan bahwa muara sungai terjadi pendangkalan hingga kedalaman 0,5 m. Kemiringan perairan berkisar 0,47% hingga 1,95% yang dikategorikan datar. Kondisi geomorfologi berupa pantai berpasir dengan didominasi gelombang dan debit sungai. ABSTRACT : Kaliboyo River is one of the river basins (DAS) in Batang Regency. The Kaliboyo River Estuary is located in Roban Village, where the majority of the civilization uses it as transportation route and a source of livelihood. The waters that used to be used as a transportation route are now undergoing changes in the form of siltation in the estuary flow, so that it has an impact on the inhibition of fishing activities, especially the shipping channel, in and out of ships. Geomorphological information is important for the planning and utilization of water in the future, one of which is dredging. The purpose of this study was to determine the geomorphological conditions of the Kaliboyo Estuary waters, Batang Regency. This research was conducted by depth analysis using a Garmin GPSMap 585 singlebeam echosounder instrument to determine the depth of the waters, as well as a grab sampler to take basic sediment samples. Data processing was processed using ArcGIS 10.4 and Surfer 11 software to obtain the results of bathymetry contours and sediment distribution to determine geomorphological conditions. Based on the results of the study, it shows that river mouths shallow to a depth of 0.5 m. The water slope ranges from 0.47% to 1.95% which is categorized flat. Geomorphological conditions is sandy beaches dominated by waves and river discharge.
PREDIKSI WAKTU SPAWNING KARANG ACROPORA PADA MUSIM PERALIHAN KEDUA DI PULAU SAMBANGAN KEPULAUAN KARIMUNJAWA JEPARA Komarudin, Agus Nurul; Munasik, Munasik; Marwoto, Jarot
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.475 KB) | DOI: 10.14710/jmr.v2i4.3688

Abstract

Knowledge of coral reproduction in Indonesian waters were divided into three groups, there are the spawning time which occurs in first transition season or before East season (January to April), the spawning time which occurs in second transition season or before West season (September-November), and the spawning time which occurs throughout the year. This study aims to predicted spawning time of Acropora by observe gonad maturity level during second transition season (September-October 2012) at Sambangan Island Karimunjawa Archipelago Jepara. The method used in this research was descriptive method. Distribution and composition Acropora were observed using Line Intercept Transect (LIT) method. Spawning time of Acropora was determined by presence or absence of gonad contents, and the maturity level of the gonads deferred to Hanafy et al. (2009). Gonad was examine in new moon phase, before full moon phase, and after full moon phase. The result show that distribution and composition of coral species Acropora at Sambangan Island in depth of 1-3 m was known 5 species of the stations I, 6 species at station II, and 8 species at station III with the highest cover composition at each station was a species A. formosa. Total 8 species Acropora were observe however only two species were found content of gonad. There were Acropora carduus and A. formosa. The gonad of coral A. carduus matured earlier than A. formosa. Gonad maturity of A. carduus occurred in September 2012 (new moon) and then gonad didn’t found in the phase before the full moon. Gonad maturity of coral A. formosa occured on the full moon phase in October 2012 and the phase after full moon the colony hadn’t contain gonads. Based on this information spawning of two species of Acropora likely occurred in different moon phase. Species of A. carduus has been spawned before the full moon phase and species A. formosa has been doing spawning after the full moon phase in October 2012.
Co-Authors Agus Nurul Komarudin Alfi Satriadi Anindya Wirasatriya Arindri Diestya Hernomo Baskoro Rochaddi Cezalipi, Javier Fortina Qualifa, Fortina Gentur Handoyo Guntara, Otto Hadyan Rafdi Kamarz, Hadyan Rafdi Halim, M. Arief Rahman Hariadi Hariadi Haryanto, Nur Fitriana Heny Suseno Indra Budi Prasetyawan Izzuddin Al Faruqi, Izzuddin Kunarso Kunarso Landi Prasetyo Hutomo, Landi Prasetyo Marganita, Dia Munasik Munasik Muslim Muslim Naufalina, Nadhira Eka Nia Irawati, Nia Purwanto Purwanto Putri, Elsa Mayora Jovanka Satria, Fadhel Wira Shofian, Tyandi Siddhi Saputro Sri Yulina Wulandari Sugeng Widada Tria Dewi Anggraeni, Tria Dewi Warsito Atmodjo Wibowo, Yeremia Septian Agung Widiaratih, Rikha Wiyadi, Haidar Thahir Yulianto Dwi Laksono, Yulianto Dwi