Muhammad Zainuddin Lubis

Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) Whistle Sound by Denoising Spectra with Discrete Wavelet Transform (DWT)

Bottle nose dolphins including mammals that have good hearing sensitivity. It is caused by a network system senses of hearing has been well. Dolphins can hearing of sounds with frequencies range 1-150 kHz [2]. High sensitivity is indispensable for echolocation. Echolocation is the ability to sense through sound and hearing. This activity occurs in two steps, the first dolphin issued Clicks high frequency (120 kHz), and then projected through the front of the head area (melon) into the surrounding aqueous medium. When Clicks of an object, will form an echo or sound waves to be received by dolphins and processed into information about the location or type of object [3](Figure 1). Figure 1: Dolphin whistle sound. (A) Waveform of whistle and (B) Whistle sound spectrograms display the frequency in which there is still noise [6].

The Coherency and Correlation between Sea Surface Temperature and Wind Velocity in Malacca Strait: Cross Wavelet Transform and Wavelet Coherency Application

This study tried to observe the correlation and coherency between sea surface temperature (SST) and wind velocity in the Malacca Strait at the year of 2015. The SST and wind velocity data with 6 hours interval step have been used in this study. S-Transform, the Cross Wavelet Transform, and the Wavelet Coherency were applied to observe the influence of the variation of sea surface temperature to the wind velocity in Malacca Strait. These methods could produce the phase lag and the time of occurrence between them. S-Transform was used to show the spectrum energy of the sea surface temperature variation. The strongest correlation between them has the period of 32 days during July to August and October to November at each point with significance level of 95 %. The coherency of them has the range of 4 to 64 days at each point. The last result is the spectrum energy of SST variation that has the period of 5 to 50 days at each point. It was similar to the result of the correlation and coherence period between the wind velocity and the SST data

Seabed Detection Using Application Of Image Side Scan Sonar Instrument (Acoustic Signal)

The importance of knowing the method for seabed detection using side-scan sonar images with sonar instrument is a much-needed requirement right now. This kind of threat also requires frequent sonar surveys in such areas. These survey operations need specific procedures and special equipment to ensure survey correctness. In this paper describes the method of observation and retrieval of marine imagery data using an acoustic signal method, to determine a target based on the sea. Side scan sonar is an instrument consisting of single beam transducer on both sides. Side scan sonar (SSS) is a sonar development that is able to show in two-dimensional images of the seabed surface with seawater conditions and target targets simultaneously. The side scan sonar data processing is performed through geometric correction to establish the actual position of the image pixel, which consists of bottom tracking, slant-range correction, layback correction and radiometric correction performed for the backscatter intensity of the digital number assigned to each pixel including the Beam Angle Correction (BAC), Automatic Gain Control (AGC), Time Varied Gain (TVG), and Empirical Gain Normalization (EGN).

ANALYSIS OF SAND DUNES DAMAGES USING REMOTE SENSING METHOD IN PARANGTRITIS KRETEK BANTUL

ABSTRAK Indonesia passed the equator make Indonesia get some kind of wind. The wind helps the formation of sand dunes such as those on parangtritis. Human population is growing and is not supported by the increase of the land, then the existence of sand dunes began to interfere with land transfer function for the fulfillment of human needs. The purpose of this research is to determine the extent of damage and reduction of the sand dune area in parangtritis and the cause of its damage. The method used in this research is the extraction of information from spatial data in each year of data recording then analyzed to obtain data or information regarding changes in sand dunes area. The interpretation results show that the area of sand dunes in 2003 was 277,083 Ha, while the area of sand dunes with visual interpretation of the image of 2015 shows that the current sand dune area is 169.378 Ha. The results of both areas of the sand dunes experienced a reduction of 107,705 hectares or it can be said that the sand dunes area over the year span experienced a reduction of 47.4%. Key Word: Sand dunes; Spatial Data; Land Transfer Function.

Bioacoustic Spectral Whistle Sound and Behaviour of Male Dolphin BottleNose (Tursiops aduncus) at Safari Park Indonesia, Cisarua Bogor

Whistle sound is generally used for echolocation purposes, while the sound of the blast-beat and whistles play a major role in internal and inter-group communication. The purpose of this research is to know the power spectral patterns and fluctuations in sound based on frequency and Power Spectral Density (PSD) of the sounds produced by dolphins and observing the position of dolphins, Noisy Time Domain (NTD) and behavior using underwater camera, and also comparing between time and sound spectrum. Data recording was taken at the Safari Park of Cisarua Bogor in Indonesia, by taking data in show pool and show pool. The results showed that salinity before feeding time in the show pool with replication 1,2, and 3 has salinity value that is equal to 30%. Data at the show pool before feeding with replications 1,2, and 3 has a salinity of 29%. Power Spectral Density (PSD) of the whistle sound before feeding was different from one another, but it has the same frequency range. The highest intensity values is at sound whistle 3 before feeding time at the show pool with an intensity value of 28.03 dB/Hz with frequency interval of 14642-16000 Hz. F-test at the show pool before meals has heterogeneous value. Treat before meals at the show pool has a value of P < 0.001 and P < 0.001. Value Noisy Time Domain has differences with each other and has a lot of different sound patterns. In general, there are real differences are evidenced by F test on a range of time at each whistle on physiotherapy and swimming pool show in the time before meals. The position of dolphins in a pool show more dominant and often in the bottom of the pool, the position of the dolphins affects the frequency.

Echo Processing and Identifying Surface and Bottom Layer with SimradEk/Ey 500

Simrad EK 500 Scientific 38-kHz and 120-kHz echo sounding system in the acoustics lab will be turned on during all scientific operations and should be monitored regularly for the presence of unusual acoustic signals or heavy fish sign. In the acoustic system, split beam processor is one of the acoustic devices that can help to echogram processing. The hardware required in the form of hardware, SIMRAD EK 500, and software, SIMRAD Echo EP 500. Processor 500 can be used for the calculation of the density of fish from fish or fish group. In echogram there are 12 scale color representing the image signal strength emitted by the object affected. Range Sa value on surface layer is -10 dB - (-4) dB, range Sv value on surface layer is 0 dB - (-89) dB, range Sa value on bottom layer is 15 dB - (-2) dB, range Sv value on bottom layer is -57 dB - (-74) dB. The total value Sa (dB) produces the extraction of data on surface layer using simple linear regression equation which produce y=0.0961x - 6.4388, R²=0.9159, with alpha value is 5, the results obtained shows the relationship between the value Sa obtained by looking at the percentage value that is 91%. In this paper the result there is a difference between the processing value Sa and Sv, where the value of Sv.

Detection Backscatter Value of Mangrove Crab (Scylla Sp.) Using Cruzpro Fishfinder Pcff-80 Hydroacoustic Instrument

Hydroacoustic method has been used in various field of marine research. Use hydroacoustic method is a method developed to obtain information about the mangrove crab (Scylla sp.). This study analyses the value Target Strength (TS), Power Spectral Density (PSD), and Fast Fourier Transform (FFT) used the instrument hidroakustik. Data collection was performed at the Laboratory of Marine Acoustics using instruments CruzPro PCFF-80 operated with a frequency of 200 kHz. Results of detection of the target by looking at the value of Target strength, strongest TS value can be seen at a depth of 0.6 meters from the transducer with estimations it is the result of target detection. The target strength (TS) of the mangrove crab (Scylla sp.) ranged between –50 and –54 dB. TS value at ping number of 0-500 have a greater value is the value of -55 dB, TS value at that time have in common with TS value at ping number 2500-3000. SV value is no different than the value of TS is caused using 1 target. Echo level (EL) value versus time has highest peak in the range of 115 dB with the lapse ping number is 15-25, with values that are at the end of the echo of ping number of 70 with value is 132 dB rated Power Spectral Density (PSD) is actually located at 2900 s, and depth of a pool is not affect the value of backscatter targets.

Bioacoustic: Percentage Click Sound of Indo-Pacific Bottlenose Dolphins(Tursiops Aduncus) in Captivity, Indonesia

Bioacoustics is a combination between biology and acoustic study which usually refers to a study on sound production, dispersion through elastic media, and reception in animals, including humans. Bio sonar signals dolphin radiated along the beam axis of an Atlantic bottlenose dolphin resemble short transient oscillations. The purpose of this research is to measure, analyse, distinguish dolphin sound characteristics and detect the click sound by the dolphins. Indo-pacific bottlenose dolphins, maintained in captivity, Indonesia, had the lowest intensity of 18.76 dB while the highest were 32.02 dB with 100% percentage. Sound frequency range of Indo-pacific bottlenose dolphins in captivity, Indonesia was between 13.211 – 15.245 Hz. The percentage maximum intensity in the frequency is 14 kHz can be seen the percentage shown in the amount of 100% and minimum percentage of 75% in frequency 13 kHz sounds are probably produced by air movements in the nasal plugs. Sub frequency of 10 kHz has a value of 649.89 × 103, and 14 kHz with anti-log value of 782.82 × 103. Frequency of the sounds produced by a bottlenose dolphin ranges from 0.2 to 150 kHz. The lower frequency vocalizations (0.2 to 50 kHz) are likely used in social communication. Social signals have their most energy at frequencies less than 40 kHz. Higher frequency clicks (40 to 150 kHz) are primarily used for echolocation.

PRODUKSI SUARA DAN TINGKAH LAKU LUMBA-LUMBA JANTAN HIDUNG BOTOL (Tursiops aduncus ) DENGAN METODE BIOAKUSTIK DI TAMAN SAFARI, CISARUA BOGOR, INDONESIA

Produksi suara merupakan bagian dari metode bioakustik, yaitu menggabungkan biologi dan akustik yang biasanya merujuk pada penelitian mengenai produksi suara, dispersi melalui media elastis, dan penerimaan pada hewan, termasuk manusia. Penelitian ini mengamati tingkah laku lumba-lumba jantan dengan melakukan pendekatan ilmu bioakustik yang melihat karakteristik dari lumba-lumba tersebut. Lumba-lumba jantan (Tursiops aduncus) yang dipelihara di Taman Safari Indonesia, Cisarua Bogor memiliki nilai intensitas terendah sebesar 28,03 dB dan tertinggi adalah sebesar 32,01 dB. Dengan rata-rata parameter yang terukur yaitu salinitas sebesar 30 ‰ dan suhu 23 °C dengan kedalaman kolam 4,5 meter. Range frekuensi suara klik dengan nilai intensitas tertinggi yaitu sebesar 32 dB dengan suara klik sesudah makan pada hari ke 2 yang terdapat pada range frekuensi yaitu 14 - 16 kHz. Range frekuensi suara klik lumba-lumba jantan hidung botol (Tursiop saduncus) di Taman Safari, Cisarua Bogor, Indonesia yaitu pada frekuensi 14,2- 15 kHz.