scholarly journals Pemanfaatan Data Angin Untuk Karakteristik Gelombang Laut Di Perairan Natuna Berdasarkan Data Angin tahun 2009 - 2018

2019 ◽  
Vol 8 (2) ◽  
pp. 55
Author(s):  
Ary Afriady ◽  
Tasdik Mustika Alam ◽  
Mochamad Furqon Mustika Azis Ismail
Keyword(s):  
Wave Height ◽  
Wave Period ◽  
Wind Data ◽  
Wave Direction ◽  
The West ◽  
Maximum Wave Height ◽  
Transition Season ◽  
Forecasting Analysis ◽  
Environmental Prediction ◽  
Wave Forecasting

Analisis data angin dilakukan untuk meramalkan dan menentukan karakteristik gelombang laut di perairan Pulau Natuna. Data angin yang digunakan dalam penelitian ini berasal dari National Centers for Environmental Prediction (NCEP) selama 10 tahun dari tahun 2009 sampai dengan tahun 2018. Metoda yang digunakan untuk estimasi tinggi, periode dan arah gelombang laut yang dibangkitkan oleh angin adalah metode Svedrup, Munk dan Bretschneider (SMB). Hasil perhitungan peramalan karakteristik gelombang diperoleh bahwa pembentukan gelombang didominasi oleh arah yang berasal dari timur laut dan terjadi pada musim barat dan musim peralihan 1. Adapun pada musim timur dan peralihan, arah dominan gelombang masing-masing berasal dari selatan dan barat daya. Tinggi gelombang maksimum 1,0-1,4 m sering terjadi pada musim musim timur, adapun tinggi gelombang minimum 0,2-0,6 m dominan terjadi pada musim musim peralihan. Periode gelombang dominan ditemukan pada kisaran 7-9 detik yang terjadi pada tiap musim.  The analysis of wind data has been done to forecast and determine the characteristic of the ocean wave in Natuna Island waters. The wind data in this study came from the National Centers for Environmental Prediction (NCEP) for a period of 10 years from 2009 to 2018. The method to estimate wave height, wave period, and wave direction generated by wind is Sverdrup, Munk dan Bretschneider (SMB) system. The results of wave forecasting analysis show that the formation of the wave is mainly originated from the northeast which occurs during the west and first transition season. As for the east and second transition season, the origin of wave formation coming from the south and southwest, respectively. The maximum wave height of 1.0-1.4 m frequently occurs during the east monsoon, while the minimum wave height. The dominant wave period is found in the range of 7-9 seconds, which occurs in every season. 

scholarly journals Kajian Energi Gelombang Laut Di Daerah Abrasi Serangai, Bengkulu Utara Melalui Pengamatan Tinggi Gelombang Laut

2021 ◽  
Vol 11 (2) ◽  
pp. 143
Author(s):  
Ashar Muda Lubis ◽  
Yosi Apriani Putri ◽  
Rio Saputra ◽  
Juhendi Sinaga ◽  
M Hasanudin ◽  
...  
Keyword(s):  
Wave Height ◽  
Wave Energy ◽  
Seasonal Variations ◽  
Coastal Area ◽  
Significant Wave Height ◽  
Ocean Waves ◽  
Wave Period ◽  
Maximum Wave Height ◽  
Significant Wave ◽  
Sea Wave

<p class="AbstractText"><span lang="EN-AU">The Serangai area, Batik Nau District, North Bengkulu has the highest average abrasion speed of 20 m/year. The abrasion could cause the coastal area to erode the coastline till several tens of meters. The purpose of this study was to determine the height of the ocean waves and to determine the energy of the ocean waves that has the potential to accelerate the abrasion process in the Serangai area. The research was carried out on November 5-7, 2018 in the Serangai beach area at a depth of 5 m using SBE 26 Plus Seagauge Wave equipment. The results showed that the observed wave height was between 0.8-1.6 m with a significant wave height (Hs) of 1.38 m. In addition, the wave period ranges from 5-11 s with a significant wave period (Ts) of 8.2 s. The result also shows that the maximum wave height of 1.6 m occurred on November 7, 2018 with maximum wave energy of 1800 J/m<sup>2</sup>. This result can perhaps accelerate the abrasion process in the Serangai area. It can also be seen that the wave height in the Serangai region is higher than in several other areas in Indonesia. However, it is necessary to continue observing the wave height to see the seasonal variations in sea wave height in Serangai area.</span></p>

scholarly journals STUDY ON THE FAST MISSILE CRAFT OF 60 M ON THE SEASTATE CONDITION OF THE WEST AND EASTERN INDONESIAN WATER

2017 ◽  
Vol 11 (3) ◽  
pp. 239-250
Author(s):  
Soegeng Hardjono
Keyword(s):  
South China Sea ◽  
Statistical Methods ◽  
Wave Height ◽  
South China ◽  
Empirical Formula ◽  
The South China Sea ◽  
Extreme Wave ◽  
The West ◽  
Maximum Wave Height ◽  
The North

Recently, Indonesian Navy is developing warship fleet by constructing Fast Missile Craft (KCR) 60M. The performance of KCR 60M  depends on the wave height of Indonesian waters. It needs to perform research on the maximum wave height for the ship length of KCR 60M and the minimum ship length of KCR 60M to cope with the highest extrem waves by statistical methods and empirical formula. The analysis result shows that KCR 60M can operate at a maximum wave height of 4,73m. Since the wave height of Indonesian water is less than 4,73m, then KCR 60M can operate throughout the year, except in Desember and January in the North areas of Indonesia near the South China Sea border due to the moonsun Asia. However, the existency of the extrem wave height >4,3m cause KCR 60M unable to operate whether in the North or South Equators as well as Inter-island waters. KCR 60M also unable to operate in the whole Naval Main Base (Lantamal) from Lantamal II (Padang) up to Lantamal XIV (Sorong). Based on the average extreme wave height of 5,1m, it can be determined that KCR 60M capable of operating has a minimum ship length of about 70m.

Temporal and spatial variability of the open coast wave climate of Victoria, Australia

2020 ◽  
Vol 71 (3) ◽  
pp. 394 ◽  
Author(s):  
S. L. McSweeney
Keyword(s):  
Wave Height ◽  
East Coast ◽  
Southern Oscillation ◽  
Southern Annular Mode ◽  
Wave Climate ◽  
Strong Positive Correlation ◽  
Wave Direction ◽  
The West ◽  
Open Coast ◽  
Wave Conditions

The open coast of Victoria, Australia, is one of the highest wave energy coastlines globally. Despite this, a lack of permanently deployed wave buoys has limited prior analysis of wave conditions. In this study, the wave climate of Victoria was analysed using 31 years of directional data hindcast from the National Oceanic and Atmospheric Administration’s WaveWatch-III model (Climate Forecast System Reanalysis hindcasts). An eastward decrease in wave height and period occurs from Portland to Wilson’s Promontory. This trend then reverses on the east coast. Across the west and central coasts, wave direction is dominated by south-west swells as influenced by strong westerly winds and mid-latitude low-pressure systems. On the east coast, wave direction becomes more variable, with added southerly, south-east and easterly components. The Southern Annular Mode influences wave climate variability on the west coast and is negatively correlated with storm frequency and wave direction. On the east coast, the El Niño–Southern Oscillation showed a strong positive correlation with wave height and a negative correlation with direction. This work provides a benchmark to compare to future changes. It will inform a higher-resolution analysis of the spatial correlation of wave conditions with climate processes to predict shoreline response.

Comparative wave measurements at a wave energy site with a recently developed low-cost wave buoy (Spotter), ADCP and pressure loggers

2021 ◽  
Author(s):  
Orrin Lancaster ◽  
Remo Cossu ◽  
Sebastien Boulay ◽  
Scott Hunter ◽  
Tom E. Baldock
Keyword(s):  
Wave Height ◽  
Wave Energy ◽  
Significant Wave Height ◽  
Low Cost ◽  
Wave Period ◽  
Wave Direction ◽  
Mean Values ◽  
Significant Wave ◽  
Wave Measurements ◽  
The Mean

AbstractWave measurements from a new, low-cost, real-time wave buoy (Spotter) are investigated in a comparative study as part of a site characterization study at a wave energy candidate site at King Island, Tasmania, Australia. Measurements from the Sofar Ocean Spotter buoy are compared with concurrent measurements from a Teledyne RD Instrument (RDI) 1200 kHz Work Horse ADCP and two RBRsolo3 D wave16 pressure loggers. The comparison period between 8th August – 12th October 2019 provides both the shallowest and longest continuous published comparison undertaken with the Spotter buoy.Strong agreement was evident between the Spotter buoy and RDI ADCP of key wave parameters including the significant wave height, peak wave period, and mean wave direction, with the mean values of those parameters across the full deployment period agreeing within 3%. Surface wave spectra and directional spectra are also analyzed with good agreement observed over the majority of the frequency domain, although the Spotter buoy records approximately 17% less energy within a narrow frequency band near the peak frequency when compared to the RDI ADCP. Measurements derived from the pressure loggers routinely underestimated the significant wave height and overestimated the mean wave period over the deployment period. The comparison highlights the suitability of the Spotter buoy for low-cost wave resource studies, with accurate measurements of key parameters and spectra observed.

scholarly journals A TYPHOON WAVE HINDCASTING TECHNIQUE

1984 ◽  
Vol 1 (19) ◽  
pp. 38
Author(s):  
N.K. Liang ◽  
C.C. Chien
Keyword(s):  
Wave Height ◽  
Wind Wave ◽  
Measured Data ◽  
Simple Method ◽  
Maximum Wave Height ◽  
Typhoon Wave ◽  
Wave Heights ◽  
Wave Hindcasting ◽  
Wave Forecasting ◽  
Energy Conservation Principle

The typhoon wave forecasting technique proposed by C.L. Bretschneider (1) is a good simple method. However, the measured maximum wave height at Nan-Wan Bay (at southern tip of Taiwan) of Ida typhoon is about twice of the hindcasted maximum wave height. In general, the hindcasted maximum typhoon wave height arrives earlier than the measured data for Bretschneider's method as well as the other methods, such as Tang's and Ijima's methods. And as the typhoon is approaching the station, the hindcasted wave heights are smaller than the measured ones. On the contrary, as the typhoon is leaving the station, the hindcasted wave heights are greater than the measured heights. In order to improve these defects, the typhoon swell proposed by Liang (7) is superimposed upon the typhoon wind wave according to the energy conservation principle. The modified wave period is calculated by the energy-weighted method. In this paper 8 typhoons are as examples to show that the new method has amended the above-mentioned defects.

scholarly journals EXTREME WAVE CONDITIONS IN BRITISH AND ADJACENT WATERS

1972 ◽  
Vol 1 (13) ◽  
pp. 6 ◽  
Author(s):  
Laurence Draper
Keyword(s):  
Wave Height ◽  
Offshore Structures ◽  
Wave Period ◽  
The Other ◽  
Wind Data ◽  
Extreme Wave ◽  
Wave Measurements ◽  
Extreme Wind ◽  
Wave Conditions

Information on extreme wave conditions is needed in the design of offshore structures. This paper present the results of calculations of the parameters in the 50-year storm; the work has been based on extreme wind data and on instrumental wave measurements. The results are complementary, and are combined in two maps, one of extreme wave height and the other of the corresponding wave period.

scholarly journals Trends of significant wave height and sea level in the southern water of the Special Region of Yogyakarta

2020 ◽  
Vol 200 ◽  
pp. 02025
Author(s):  
Martono ◽  
Indah Susanti ◽  
Bambang Siswanto ◽  
Amalia Nurlatifah ◽  
Mamat Suhermat ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Zone ◽  
Wave Height ◽  
Significant Wave Height ◽  
The West ◽  
Significant Wave ◽  
Transition Season ◽  
Special Region ◽  
And Sea Level

Coastal zone is very vulnerable to the impacts of climate change. The increase of sea wave and sea level rise threaten coastal zone. The purpose of this study is to determine trends of significant wave height and sea level in the southern waters of the special region of Yogyakarta. The data used consists of daily significant wave height from 2010-2018, weekly absolute dynamics topography from 2005-2018 and daily surface wind from 2010-2018. Trends of significant wave height and sea level were analyzed by using linear regression. The results showed that significant wave height during the east season until the second transition season was higher than the west season and the first transition season. Vice versa, sea level during the east season until the second transition season was lower than the west season and the first transition season. Trends of significant wave height has increased of 0.63 cm/year, meanwhile sea level rise reached 0.82 cm/years.

scholarly journals PEMBANGKIT LISTRIK TENAGA GELOMBANG LAUT DENGAN MENGGUNAKAN TEKNOLOGI OSCILATING WATER COLUMN (OWC) DI PERAIRAN MARANA

2021 ◽  
pp. 59-68
Author(s):  
Setiyawan Setiyawan ◽  
N. Abdulrahim
Keyword(s):  
Water Column ◽  
Wave Height ◽  
Wave Energy ◽  
Wave Power ◽  
Maximum Wave Height ◽  
Ocean Wave Energy ◽  
Tidal Water ◽  
Electricity Shortage ◽  
Wave Forecasting ◽  
Sea Wave

The alternatives to overcome electricity shortage in Indonesia is wave generating. One of the methods conducted in this research is OWC (Oscilating Water Column) based on study area criteria (Marana Village). OWC method can convert ocean wave energy atwave columnoscillationto generate electricity. To be able to produce electricity, this OWC device will train the wave energy through the OWC door hole. This research determine the amount of waves that can be utilized in Marana waters to be converted into units of electricity (watts). The amount of wave height that can be used, depends on the amount of wind that is in the waters of Marana. In addition to wave height, tidal is also needed to know the placement of Oscilating Water Column (OWC) is so that when the tidal water occurs, OWC is still in the condition of the wave. In addition, the bathymetry of the sea is also needed to know at the depth of how placed this OWC. Based on the results obtained from wave forecasting using the 2002-2006 wind data obtained maximum wave height for 5 years is 0.204 m in Year 2003. Which can generate electricity of 0.688 watts. Where from concluded in Marana waters do not have the potential to build Sea Wave Power Plant.

Study of Surface Wave Characteristics and Extreme Parameters Estimation in a Port With Submerged Breakwater

2016 ◽  
Author(s):  
Zhifeng Wang ◽  
Sheng Dong ◽  
Xiangke Dong ◽  
Xin Zhang
Keyword(s):  
Surface Waves ◽  
Wave Height ◽  
Bohai Sea ◽  
Parameters Estimation ◽  
Wave Period ◽  
Wind Data ◽  
Laizhou Bay ◽  
Strong Wind ◽  
Submerged Breakwater ◽  
Extreme Parameters

Surface waves are simulated and extreme parameters are calculated in Weifang Port in this paper. Firstly, wind data of every 3 hours from 1985 to 2010 in the Bohai Sea are simulated by Weather Research Forecast Model (WRF). Then wave elements such as significant wave height, wave period and wave direction are simulated every 1 hour from 1985 to 2010 by SWAN model in the whole of Bohai Sea. By comparison and validation, both the simulation wind data and wave data show a good agreement with the observation data. Extreme parameters of wind speed, wave height and wave period in every direction are calculated according to Pearson-III distribution at the −15m isobath in Laizhou Bay. The results show that the strong wind and wave are in direction N, NNE and NE. Surface waves are calculated using MIKE21 SW to study wave propagation from the open sea to the coast. The wave elements inside of the submerged breakwaters are calculated by three empirical formulas. The results from the three formulas are different, and the conservative result is chosen considering engineering safety.

UNDERWATER BARRED BEACH PROFILE TRANSFORMATION UNDER DIFFERENT WAVES CONDITIONS

2017 ◽  
Author(s):  
Olga Kuznetsova ◽  
Olga Kuznetsova ◽  
Yana Saprykina ◽  
Yana Saprykina ◽  
Boris Divinsky ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Coastal Zone ◽  
Wave Height ◽  
Wave Energy ◽  
Wave Period ◽  
Beach Profile ◽  
Infragravity Waves ◽  
Wave Parameters ◽  
Mean Wave Period

Based on numerical modelling evolution of beach under waves with height 1,0-1,5 m and period 7,5 and 10,6 sec as well as spectral wave parameters varying cross-shore analysed. The beach reformation of coastal zone relief is spatially uneven. It is established that upper part of underwater beach profile become terraced and width of the terrace is in direct pro-portion to wave height and period on the seaward boundary but inversely to angle of wave energy spreading. In addition it was ascertain that the greatest transfiguration of profile was accompanied by existence of bound infragravity waves, smaller part of its energy and shorter mean wave period as well as more significant roller energy.

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