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Mobile Tide and Water Level Instrument (MOTIWALI) adalah alat pengukur fluktuasi ketinggian muka air atau pasang surut menggunakan gelombang suara (acoustic tide gauge). Penelitian ini bertujuan untuk mengidentifikasi faktor pembatas dan akurasi pembacaan instrumen MOTIWALI. Perambatan suara dipengaruhi oleh kondisi suhu udara dan densitas medium sebagai bidang pantul (backscatter). Uji coba pembacaan dilakukan dengan 3 kelompok densitas medium yang berbeda (air laut, air tawar dan air payau) serta perlakuan posisi ketinggian tranduser terhadap permukaan medium uji coba (5 perlakuan). Kesesuaian pembacaan jarak oleh transduser dan interval perekaman dianalisis menggunakan ANOVA dan analisis komponen utama (PCA). Hasil analisis memperlihatkan, instrumen tidak memberikan perbedaan pembacaan jarak transduser terhadap permukaan medium uji coba dengan densitas yang berbeda, namun berbeda pada interval perekaman data yang telah ditetapkan pada confiq.sys. MOTIWALI efektif bekerja pada jarak 150 cm dari permukaan medium dan penetapan waktu perekaman ditambahkan selama 1 menit tiap perencanaan pengukuran dengan interval waktu perekaman tertentu.

Increase of human activities on coastal area in Central Weda Sub-District has caused degradation of coastal ecosystems. Even though coastal ecosystems have an essential role in marine ecology, such as coral reefs and mangrove forests, they are sometimes undermined by economic or commercial interests. This study aimed to determine density and cover percentage of mangrove forests and coral reefs in Central Weda Sub-district, North Maluku. Data collection on coral reef ecosystem components was carried out by applying georeferenced photo-transect and line transect quadrat techniques. While for mangroves, data collection included species diversity and tree/canopy cover percentage. Study result showed that based on lifeform percentage of coral reefs, most of the study areas were in a good category with 23.95% coverage, moderate condition 39,5%, and poor condition 36.6%. The coral reefs in good and moderate conditions were found at location having relatively low human activities. Whereas percentage of mangrove cover from all stations ranged from 78,39 to 78,76% with Important Value Index ranging from 106,79% to 158,32%.

Hutan mangrove memegang peranan penting di wilayah pesisir diantaranya sebagai daerah pemijahan dan tempat mencari makan organisme laut. Selain itu, hutan mangrove juga menjaga garis pantai dari ancaman abrasi. Sayangnya keberadaan hutan mangrove di wilayah Kecamatan Weda Tengah khususnya Desa Lelilef Waibulan dan Desa Lelilef Sawai telah mengalami kerusakan. Oleh karenanya perlu dilakukan suatu program rehabilitasi hutan mangrove yang berbasis masyarakat, dimana masyarakat secara aktif terlibat baik dalam tahap perencanaan, pembibitan, penanaman, monitoring dan evaluasi. Pelatihan ini berfokus pada teknik pembibitan buah mangrove sebelum di tanam dengan tujuan memberikan pemahaman dan pengetahuan yang memadai tentang cara pembibitan dan penyemaian yang baik bagi masyarakat khususnya kelompok masyarakat peduli hutan mangrove. Pelatihan berlangsung selama tiga hari dengan metode pemberian teori di kelas dan praktek lapang dilokasi pembibitan. Hasil pelatihan menunjukan bahwa semua peserta cukup memahami materi yang disampaikan. Hal ini terlihat dari cara anggota kelompok mengaplikasikan teori yang diperoleh di kelas dengan praktek lapang. Namun demikian perlu ada rencana tindak lanjut berupa pelatihan cara penanaman, perawatan dan pendampingan untuk kegiatan monitoring dan evaluasi pertumbuhan mangrove.

Tsunami is one of the catastrophic events that threatened coastal areas in Morotai Island Regency. This is partly because the location of the regency is among several active faults. Therefore, the study aims to analyze the tsunami inundation area and determine a tsunami evacuation route in Daruba Pantai Village, South Morotai District. This study begins with the preparation of a digital elevation model and is compiled with other related maps to produce the tsunami inundation area at the study site. The study results show that a tsunami can hit 176.65 ha, with the disastrous and dangerous category being 5.02% and 0.66%. Meanwhile, specifically for the Daruba Pantai Village area with an area of 60.59 ha, the disastrous and dangerous categories are 10.72% and 1.30%, and the safe category is 36.61% and secure 23.07%. Furthermore, the preparation of the evacuation route is based on the scenario that residents from each zone of both the Neighborhood Unit (RT) and Community Unit (RW) are directed to follow the evacuation path to move towards the temporary shelter point and towards the safety zone.

The movement of celestial bodies produces a variation of a gravitational gradient as a tidal generation force (GPP). Position Sabang Station, declination maximum and position lunar month of Muharram aka n generate harmonic constituent character identifier of GPP, where the water level is the sum of the amplitude of harmonic constituent that generated at a certain time.This research is to determine the variation of harmonic constituents and identify the character of harmonic constituents of GPP component position characterization in Muharram month. The results show Katrakteristik tidal movement beginning of the month of Muharram in Sabang Station occurred 1-2 hours after ijtimak.. Value riding dominant water derived from the value of Mean Sea Level ( 52%), and the dominant contribution hamonik constituents derived from component M 2 (28 - 33%). Harmonic constituents M 2 does not show the position of the moon in Muharram, while the position of the sun is reflected in the constituent phase harmonic S 2..