Underwater noise of traditional fishing boats in Cilacap Waters, Indonesia

Abstract As the main contributor to noise pollution in Cilacap waters, the noise characteristics of traditional fishing boats based on distance are very important to be studied. This research aimed to determine noise intensity and frequency based on the distance for each traditional fishing boat (3, 5, and 10 GT). The results showed that these boats emitting noise with broadband frequency and receive levels reached 153 dB re 1 μPa. The noise characteristics were different for each type of ship due to differences in the size, engine type, and operational speed. The receive level had the same decreased pattern based on the distance for each noise frequency, but with a different intensity. Meanwhile, the noise frequency had increased quadratically based on the distance, where the higher frequency, the greater change so that the noise was not detected faster.

Download Full-text

The structure of population in traditional fishing communities of north east Scotland: Whitehills and Gardenstown, 1855–1974

Northern Scotland ◽

10.3366/nor.1984.0006 ◽

1984 ◽

Vol 6 (First Series (1) ◽

pp. 45-61

Author(s):

Susan R. Baillie

Keyword(s):

Fishing Communities ◽

North East ◽

Structure Of Population ◽

Traditional Fishing

Download Full-text

Identifikasi Potensi Wisata Di Kampung Nelayan Tradisional Desa Lamalera

JURNAL DESTINASI PARIWISATA ◽

10.24843/jdepar.2017.v05.i01.p13 ◽

2018 ◽

Vol 5 (1) ◽

pp. 66

Author(s):

Edel Meriquin Dai Batafor ◽

I Nyoman Sunarta

Keyword(s):

Sea Water ◽

Sandy Beaches ◽

Tourist Attraction ◽

Fishing Village ◽

Qualitative Descriptive ◽

Tourism Potential ◽

Traditional Fishing ◽

The Village

The village of Lamalera has great tourism potential to develope as a tourist attraction. However, it is important to consider some aspects in its development, such asaspect of the environment and the community, so that it will beneficial to the environment and can improve the economy of the community.The problem in this research was the potential of Lamalera, traditional fishing village. Data obtained in this study through observation, interview and documentation. The data were analyzed in qualitative descriptive by describing the potentials of Lamalera, traditional fishing village. The results showed physical and non physical potential of the village. The physical potential of Lamalera is white sandy beaches, crystal clear sea water, undersea view and other beauty of nature; while the non physical potential is in the form of custom ceremonial, traditional dances and religious. Keywords: Identification, Potential and Tourism

Download Full-text

Stability analysis of trawls type traditional fishing boat with modification of eco-friendly fishing-gear on the north coast of Central Java

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/403/1/012052 ◽

2018 ◽

Vol 403 ◽

pp. 012052

Author(s):

Kiryanto ◽

M Ridwan ◽

B A Adietya ◽

D Chrismianto

Keyword(s):

Stability Analysis ◽

North Coast ◽

Fishing Gear ◽

The North ◽

Fishing Boat ◽

Central Java ◽

Traditional Fishing

Download Full-text

Measurement of Underwater Acoustic Energy Radiated by Single Raindrops

Sensors ◽

10.3390/s21082687 ◽

2021 ◽

Vol 21 (8) ◽

pp. 2687

Author(s):

Shu Liu ◽

Qi Li ◽

Dajing Shang ◽

Rui Tang ◽

Qingming Zhang

Keyword(s):

Ambient Noise ◽

Sound Pressure ◽

Tap Water ◽

Acoustic Energy ◽

Underwater Sound ◽

Underwater Noise ◽

Energy Characteristics ◽

Sound Energy ◽

Dipole Radiation ◽

Series Of Experiments

Underwater noise produced by rainfall is an important component of underwater ambient noise. For example, the existence of rainfall noise causes strong disturbances to sonar performance. The underwater noise produced by a single raindrop is the basis of rainfall noise. Therefore, it is necessary to study the associated underwater noise when drops strike the water surface. Previous research focused primarily on the sound pressure and frequency spectrum of underwater noise from single raindrops, but the study on its sound energy is insufficient. The purpose of this paper is to propose a method for predicting the acoustic energy generated by raindrops of any diameter. Here, a formula was derived to calculate the underwater sound energy radiated by single raindrops based on a dipole radiation pattern. A series of experiments were conducted to measure the underwater sound energy in a 15 m × 9 m × 6 m reverberation tank filled with tap water. The analysis of the acoustic energy characteristics and conversion efficiency from kinetic to acoustic energy helped develop the model to predict the average underwater sound energy radiated by single raindrops. Using this model, the total underwater sound energy of all raindrops during a rainfall event can be predicted based on the drop size distribution.

Download Full-text