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All Journal Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan
Achmad Yasir Baeda
Departemen Tenik Kelautan Universitas Hasanuddin
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Transportation

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Pengaruh Fenomen Global Pacific Decadal Oscillation Dengan Madden-Julian Oscillation Di Provinsi Papua Nur Rachmi; Achmad Yasir Baeda; Sabaruddin Rahman
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 4, Nomor 3, Edisi November 2023
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v4i3.27821

Abstract

Tropical areas such as Indonesia are ocean areas that show convective activity responses that affect the global climate balance in space and time. The equatorial region, especially Indonesia, is subject to very complex ocean-atmospheric phenomena which are influenced by many factors and phenomena such as the Monsoon/Tropical Convergence Zone (ITCZ), El Niño Southern Oscillation (ENSO), Madden-Julian Oscillation (MJO), Tropical Cyclone. /Temperate Forcing, Indian Ocean Dipole Mode (IODM), and Pacific Decadal Oscillation (PDO). This journal focuses on discussing two phenomena, namely the Madden-Julian Oscillation (MJO) and the Pacific Decagonal Oscillation (PDO) in Papua (East Indonesia). This study uses an empirical approach with statistical calculations based on the PDO variable in the form of the PDO index, the amplitude variable which represents the MJO data and the rainfall for the province of Papua. Data for these two variables were obtained from NOAA and BoM, as well as rainfall data obtained from NASA. The data period analyzed was 40 years from 1981 to 2020. Two dates were filtered and correlations were analyzed using a simple linear regression method. The results of this research show that PDO is associated with MJO in Papua. This is clearly seen from the results of the correlation of the two phenomena. In addition, these two phenomena also affect the increase or decrease in rainfall in Papua. The second impact of this phenomenon on Papua (eastern part of the archipelago) is caused by the circulation of sea water from the Pacific Ocean through the Indonesian Toughflow.
Aplikasi Composite Hanging Breakwater Sebagai Pelindung Kolam Pelabuhan Bantaeng Chairul Paotonan; Hasdinar Umar; Sabaruddin Rahman; Achmad Yasir Baeda; Muhammad Arsyad Thaha; Wasir Samad; Muhammad Aksar
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 4, Nomor 3, Edisi November 2023
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v4i3.31706

Abstract

Bantaeng Port already has a dock for the loading and unloading goods and passengers. The problem is, the port cannot be operated optimally because of the large wave height at the dock so that the loading and unloading process is not optimal. The Bantaeng Port Master Plan document recommends the construction of a breakwater. One type of breakwater that can be applied is hanging breakwater. This study analyzes the dimensions of hanging breakwater based on environmental data. The study began by collecting data on deep-sea waves and related documents. Deep sea waves are analyzed to obtain wave parameters at the building site. This structure will be placed at a depth of 20 m. After the wave parameters at the location of the structure are known, then calculate the transmission coefficient using the equation developed by previous researchers [2]. The transmition coefficient is further used to calculate the wave behind the structure. The wave behind the structure must be smaller or equal to the required wave height [3]. The results obtained shows that the higher the wave in front of the building is Hi = 1.79 m, the wave height behind the structure is required is Ht = 0.7 m and the transmission coefficient is Kt = 0.8. The width of the building in the direction of wave propagation can be calculated using the equation L= 46.757e-0.08D.
Akurasi Pengukuran Gelombang Di Depan Model Pemecah Gelombang Terapung Sabaruddin Rahman; Novrian Yosua Timang; Achmad Yasir Baeda
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 4, Nomor 1, Edisi Maret 2023
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v4i1.24302

Abstract

Sea waves are the movement of sea water on the surface with an up or down motion that is shaped the same as a sinusoidal line, which can arise due to the generating force on the sea surface with various types of sea wave generation by the wind, the attractive force between the earth, the moon and the sun, earthquakes and finally by the movement of the ship. Regular waves were tested in a wave flume 25 m long, 1 m wide and 1.2 m deep equipped with a flap type wave generator. The wave absorber at the other end is built from a mound of rock. Eight wave measuring points (HR Wallingford 8 channels) are co-located with the wavelength. Wave probes 1-5 are set at 0.1L while 5-8 are set at 0.2L. The wave generator then produces fluctuations in the water level that increase until it reaches the desired wave height. After several incoming waves, the reflected waves then lower the fluctuations in the water level until they reach a stable wave condition (which has the same shape and peak height) which indicates that the resulting waves are linear waves. The R2 method is used to evaluate the accuracy of wave measurement, that the two-point method with a wave measuring distance of 0.2L is the best method for measuring wave height. The two methods are compared with the general method to obtain the appropriate one for each case. The generated waves tend to be nonlinear with increasing wave height. The accuracy is reduced due to the nonlinearity of the resulting waves. Wave generator performance can be improved by reducing wave reflection. There is an influence of the distance of the wave meter on the accuracy of the wave height measurement. Good accuracy can be achieved at a wave probe distance of 0.2L for the two-point and three-point methods.
Co-Authors Chairul Paotonan Hasdinar Umar Muhammad Aksar Muhammad Arsyad Thaha Novrian Yosua Timang Nur Rachmi Sabaruddin Rahman Wasir Samad, Wasir