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All Journal Jurnal Kelautan Nasional Jurnal Segara

Guntur adhi Rahmawan

Ministry of marine affairs and fisheries

Author-ID : 3493035

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology

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Estimation of Sediment Distribution Based on Bathymetry Alteration (2014-2016) in the Inner Bay of Ambon, Maluku, Indonesia Guntur Adhi Rahmawan; Wisnu Arya Gemilang; Ulung Jantama Wisha; Ruzana Dhiauddin; Koko Ondara
Jurnal Segara Vol 15, No 2 (2019): Agustus
Publisher : Pusat Riset Kelautan

The development of Ambon city is centered around Ambon Bay. As the major area of marine and social activities, changes occurred directly affect to seawater degradation. Sedimentation is the main issue that has been occurring. Marine ecosystem can be potentially hampered by the high rate of sedimentation in the Inner Bay of Ambon (TAD). This study aimed to determine the distribution of sediment volume within the bay. Bathymetry of TAD was surveyed using transducer (Echosounder Echo track CVM Teledyne Odom Hydrographic Single Beam), which the depth of certain position was connected to GPS to record all the position data accurately. The field data are then analyzed spatially modelled in the form of 2D and 3D maps, overlaid with the past bathymetry data to calculate the bathymetry alteration and sediment volume estimation during 2014-2016. The depth of TAD in 2014 ranged between 0 - -42 meters, while, in 2016 the water depth slightly changed to 0 – -44 meters. The reduction of the water depth is observed in the 25 – 125 m from shoreline, where the bed thickness changes observed ranging from 0.1 - 1.4 m. Total volume of sediment augmentation reaches 13,236,182 m3 that covers about 67.67 Ha. Tidal current, that ranged averagely from 0-1.2 m/s, has a tremendous influence on sediment transport in TAD. The bay mouth, that is a semi-enclosed enclosed area, triggers sediment accumulation due to the weak tidal current transport. If ongoing, these conditions may endanger the environment and biota survival ability.

Pemetaan Morfologi Dasar Perairan dan Pola Arus Pasang Surut di Teluk Bungus, Kota Padang Guntur adhi rahmawan; Ulung Jantama Wisha
Jurnal Segara Vol 16, No 3 (2020): Desember
Publisher : Pusat Riset Kelautan

Teluk bungus merupakan kawasan teluk yang ada di kawasan pesisir kota Sumatra Barat. Banyak aktifitas kepelabuhanan dan perikanan pada kawasan tersebut seperti pelabuhan penyeberangan, bongkar muat ikan tuna, kapal batubara untuk PLTU, serta beberapa kegiatan pariwisata. Kegiatan tersebut menyebabkan degradasi lingkungan perairan kawasan pesisir, meningkatkan pemanfaatan lahan, menimbulkan berbagai kerusakan ekosistem dan sedimentasi. Penelitian ini bertujuan untuk mengetahui pola arus dan morfologi dasar perairan Teluk Bungus. Survei lapangan dilakukan dengan menggunakan alat echosunder single beam dual frequency untuk merekan data batimetri dan pemodelan arus. Kedalaman perairan teluk bungus berkisar antara 0- 28 meter dan termasuk dalam kategori perairan dangkal. Perbedaan morfologi antara channel 1 maupun channel 2 berkisar antara 0,3 sd 1,5 meter tersebar di beberapa titik lokasi. Saat pasang purnama kecepatan arus berkisar antara 0 – 2,15 m/s dengan arah dominan menuju daratan, pada kondisi surut purnama kecepatan arus berkisar antara 0-2,11 m/s. Kecepatan arus saat pasang perbani berkisar antara 0-2 m/s. Pada saat surut perbani kecepatan arus menjadi sangat rendah berkisar 0-0,56 m/s dengan arah dominan menuju barat daya. Karakteristik arus yang lemah saat kondisi perbani cenderung memicu sedimentasi di dalam teluk. Gerakan bolak-balik dari arus pasang surut semidiurnal memiliki peran dalam peningkatan sedimentasi pada beberapa area di dalam teluk.

Co-Authors Agus Sudaryadi Fitria Wahyu Andriani Ilham . Irwansyah Irwansyah Koko Ondara Nia Naelul Hasanah Ridwan Ruzana Dhiauddin Ulung Jantama Wisha Ulung Jantama Wisha Wisnu Arya Gemilang

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