Wind speed data analysis for predictions of sea waves in Bitung Coastal Waters

2013 ◽  
pp. 35 ◽  
Author(s):  
Joanes E Koagouw ◽  
Gybert E Mamuaya ◽  
Adrie A Tarumingkeng ◽  
P A Angmalisang
Keyword(s):  
Data Analysis ◽  
Wind Speed ◽  
Coastal Waters ◽  
Transition Period ◽  
Marine Resources ◽  
Land Uses ◽  
Sea Waves ◽  
North West ◽  
North Sulawesi ◽  
The Waves

Coastal area of Bitung Municipality is one of the economical activities centers in North Sulawesi Province such as for land-uses and the exploitation of natural resources. Those activities are exaggerating day bay day and tended to be uncontrollable. The excess of those conditions, it has been recorded the change of waves in Bitung waters that has impacts to coastal areas and can affect the utilization of coastal and marine resources. This research was aimed to observe waves altitude variations in Bitung waters with Svedrup Munk and Bretchsneider (SMB) method that had been used to predict waves altitudes. The results showed that the wind speed during West Season was 0.33 m and were dominant to the East, while during East season was 0.91m from South-East to North-West, and then on transition period (March to May) was 1.08m from South-East to East. The results of those wind speed to the waves altitudes in Bitung waters is discussed in this paper© Pesisir pantai Kota Bitung merupakan salah satu pusat aktivitas ekonomi (misalnya pemanfaatan lahan dan eksploitasi sumberdaya) di Provinsi Sulawesi Utara. Aktivitas tersebut semakin hari semakin meningkat dan memiliki kecenderungan tidak terkontrol. Akibat dari keadaan tersebut, telah terjadi perubahan fenomena gelombang di perairan Bitung yang berdampak pada keberadaan daerah pesisir pantai di mana hal ini dapat mengganggu aktivitas pemanfaatan sumberdaya pesisir dan laut tersebut. Penelitian ini bertujuan untuk mengetahui variasi tinggi gelombang di perairan Bitung dengan menggunakan metode Svedrup Munk and Bretchsneider (SMB) yang biasa digunakan untuk peramalan tinggi gelombang signifikan. Hasil penelitian menunjukkan bahwa kecepatan angin pada Musim Barat sebesar 0,33 meter dan dominan ke arah Timur, sementara pada Musim Timur sebesar 0,91 meter dari arah Tenggara ke Barat Laut, serta pada Musim Peralihan (antara bulan Maret-Mei) adalah sebesar 1,08 meter dari arah Tenggara dan Timur. Pengaruh kecepatan angin tersebut terhadap gelombang laut di perairan Bitung dibahas dalam tulisan ini©

scholarly journals Interaction of Swell and Sea Waves with Partially Reflective Structures for Possible Engineering Applications

2019 ◽  
Vol 7 (2) ◽  
pp. 31 ◽  
Author(s):  
Andrea Lira-Loarca ◽  
Asunción Baquerizo ◽  
Sandro Longo
Keyword(s):  
Wind Speed ◽  
Rigid Wall ◽  
Wave Period ◽  
Phase Lag ◽  
Relative Width ◽  
Sea Waves ◽  
Regular Waves ◽  
Natural Period ◽  
Resonant Effect ◽  
The Waves

In this work, we investigate the interaction between the combination of wind-driven and regular waves and a chamber defined by a rigid wall and a thin vertical semi-submerged barrier. A series of laboratory experiments were performed with different values of incident wave height, wave period, and wind speed. The analysis focuses on the effect of the geometry of the system characterized in terms of its relative submergence d/h and relative width B/L. Results show that for the case of d/h = 0.58 a resonant effect takes place inside the chamber regardless of the wind speed. Wind-driven waves have a higher influence on the variation of the wave period of the waves seaward and leeward of the plate, as well as on the phase lag. Results show that the amplification or reduction of the wave energy inside the chamber is closely related to the wave period as compared to the 1st order natural period of the chamber.

WAVE CLIMATE OF THE BLACK SEA’S COASTAL WATERS DURING THE LAST THREE DECADES

2017 ◽  
Author(s):  
Fedor Gippius ◽  
Fedor Gippius ◽  
Stanislav Myslenkov ◽  
Stanislav Myslenkov ◽  
Elena Stoliarova ◽  
...  
Keyword(s):  
Wind Speed ◽  
Cell Size ◽  
Coastal Waters ◽  
Wind Wave ◽  
Spatial Scales ◽  
Wave Model ◽  
Wave Climate ◽  
Computational Grid ◽  
Coastal Areas ◽  
Wave Parameters

This study is focused on the alterations and typical features of the wind wave climate of the Black Sea’s coastal waters since 1979 till nowadays. Wind wave parameters were calculated by means of the 3rd-generation numerical spectral wind wave model SWAN, which is widely used on various spatial scales – both coastal waters and open seas. Data on wind speed and direction from the NCEP CFSR reanalysis were used as forcing. The computations were performed on an unstructured computational grid with cell size depending on the distance from the shoreline. Modeling results were applied to evaluate the main characteristics of the wind wave in various coastal areas of the sea.

scholarly journals WAVES AT SEKONDI, GHANA

1966 ◽  
Vol 1 (10) ◽  
pp. 1 ◽  
Author(s):  
L. Draper
Keyword(s):  
Southern Hemisphere ◽  
Sea Waves ◽  
Severe Damage ◽  
Pressure Recording ◽  
Electric Wave ◽  
International Geophysical Year ◽  
Time Of Year ◽  
The Waves ◽  
Wave Recorder ◽  
International Geophysical

During the International Geophysical Year the National Institute of Oceanography in collaboration with Ghana IGY Committee and the Ghana Railway and Harbours Administration made recordings of sea waves at a point 2,300 feet off Sekondi point in a direction 156°. The instrument used was an N.I.O. piezo-electric wave recorder of the pressure recording type. Recordings started in June, 1958, and continued until the end of October that year when the cable suffered severe damage which could not easily be repaired. Because of the high cost of cable and the fact that a good series of records had already been obtained for a rough time of year, the instrument was recovered and used elsewhere. Records were taken every two hours and each has a useable length of twelve minutes. Most of the waves arriving at Sekondi are in the form of swell which has been generated by storms in the southern hemisphere; consequently wave conditions do not change very quickly, and it was found unnecessary to analyse every record except during rough conditions. The method of analysis used is that described in the associated paper "The Analysis and Presentation of Wave Data - a Plea for Uniformity".

scholarly journals ANALISIS MINAT REMAJA DALAM BERORGANISASI DI KELURAHAN LEMPAKE KOTA SAMARINDA

2019 ◽  
Vol 3 (1) ◽  
pp. 43
Author(s):  
SAID ZULKIFLI ◽  
MOHAMAD HUSNI ◽  
DINA AKMILA
Keyword(s):  
Data Analysis ◽  
Data Model ◽  
Transition Period ◽  
Social Motivation ◽  
Internal Motivation ◽  
Emotional Factors ◽  
Analysis Technique ◽  
The Social ◽  
Organizational Activities ◽  
Age Range

ABSTRAK Masa remaja merupakan masa transisi dari masa kanak-kanak menuju masa dewasa, kisaran umur dari 10 hingga 24 tahun. Di masa inilah seseorang mencari jati diri untuk membentuk karakter kepribadian, seperti pengalaman baru maupun teman baru. Tujuan penelitian untuk mengetahui minat serta faktor pendukung dan faktor penghambat remaja di Kelurahan Lempake, dan difokuskan pada tiga faktor yaitu faktor dorongan dari dalam diri, faktor motivasi sosial, dan faktor emosional. Jenis penelitian ini yaitu penelitian kualitatif, dimana teknik analisisnya menggunakan analisis data model interaktif. Hasil analisis data diketahui bahwa minat remaja didasari dari faktor dorongan dari dalam diri, faktor motivasi sosial, dan faktor emosional. Akan tetapi dari tiga faktor tersebut yang sangat berperan ialah faktor motivasi sosial. Faktor pendukung remaja dalam berorganisasi selain yaitu lingkungan tempat tinggal, keluarga, dan teman, sedangkan untuk faktor yang menghambat minat tidak ada akan tetapi terkadang faktor yang menghambat remaja untuk mengikuti kegiatan organisasi yaitu waktu kuliah yang berbenturan dengan kegiatan organisasi. Kata kunci : Minat, Remaja, Organisasi ABSTRACT Adolescence is a transition period from childhood to adulthood, age range from 10 to 24 years. It is at this time that someone searches for identity to shape personality traits, such as new experiences and new friends. The purpose of the study was to determine the interests and supporting factors and inhibiting factors of adolescents in Kelurahan Lempake, and focused on three factors, namely internal motivation, social motivational factors, and emotional factors. This type of research is qualitative research, where the analysis technique uses interactive model data analysis. The results of the data analysis revealed that adolescent interest was based on internal motivation, social motivation, and emotional factors. However, of the three factors that are very important is the social motivation factor. Supporting factors of adolescents in organizing other than the environment where they live, family, and friends, while for factors that inhibit interest there are no but sometimes factors that hinder adolescents from participating in organizational activities, namely college time that collide with organizational activities. Keywords: Interest, Adolescence, Organization

scholarly journals Determination of Rock Type Using Hydraulic Flow Unit Concept to Predict Permeability with Artificial Neural Network

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Ghanima Yasmaniar ◽  
Ratnayu Sitaresmi ◽  
Suryo Prakoso
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Data Analysis ◽  
Rock Type ◽  
Flow Unit ◽  
West Java ◽  
North West ◽  
Hydraulic Flow ◽  
Core Data ◽  
The North

<em>Permeability is one of the important of reservoir characteristics, but is difficult to predict it. The accurate permeability values can be obtained from core data analysis, but it is not possible to do at all of the well intervals in the field. This study used 191 sandstone core samples from the Upper Cibulakan Formation in the North West Java Basin. The concept of HFU (Hydraulic Flow Unit) developed by Kozeny-Carman is used to generate the relationship between porosity and permeability for each rock type. Afterward, to estimate the permeability value at uncored intervals, the statistical methods of artificial neural network based on log data are used on G-19 Well, G Field which is located in the North West Java Basin. Based on core data analysis from this research, the reservoir consists of eight HFU with different equations to estimate permeability for each HFU. From this reserarch, the results of permeability calculations at uncored intervals are not much different from the core data at the same depth. Therefore the approach of permeability prediction can be used to determine the value of permeability without performing core data analysis so that it can save the company expenses.</em>

scholarly journals Multiscale coherence analysis of reference evapotranspiration of north-western Iran using wavelet transform

2021 ◽  
Author(s):  
V. Sreedevi ◽  
S. Adarsh ◽  
Vahid Nourani
Keyword(s):  
Wind Speed ◽  
Reference Evapotranspiration ◽  
Local Scale ◽  
Wavelet Coherence ◽  
Coherence Analysis ◽  
Drastic Reduction ◽  
North West ◽  
Mean Temperature ◽  
North Western ◽  
Multiple Wavelet Coherence

Abstract This study applies different wavelet coherence formulations for investigating the multiscale associations of reference Evapotranspiration (ET0) of Tabriz and Urmia stations in North West Iran with five climatic variables, mean temperature (T), pressure (P), relative humidity (RH), wind speed (U) and Solar Radiation (SR). The relationships between different variables are quantified using the Average Wavelet Coherence (AWC) and the Percentage of Significant Coherence (PoSC). The Bivariate Wavelet Coherence (BWC) analysis showed that mean temperature (AWC = 0.73, PoSC = 59.18%) and wind speed (AWC = 0.63, PoSC = 49.55%) are the dominant predictors at Tabriz and Urmia stations. On considering the Multiple Wavelet Coherence (MWC) analysis, it is noticed that among the two-factor combinations, the T-P and P-RH combinations resulted in the highest coherence values for Tabriz and Urmia stations. T-U-SR combination produced the highest multiple wavelet coherence values among the three-factor cases for both the stations. The Partial Wavelet Coherence (PWC) analysis indicated a drastic reduction in coherence from the values of respective BWC analysis, indicating a strong interrelationship between different variables and ET0. The interrelationship between meteorological variables and ET0 is more apparent at Tabriz, while it is controlled more by the local-scale meteorology at Urmia.

Offshore Wind Power Assessment on the East Coast of Saudi Arabia

2005 ◽  
Vol 29 (5) ◽  
pp. 409-419 ◽  
Author(s):  
Shafiqur Rehman
Keyword(s):  
Saudi Arabia ◽  
Wind Speed ◽  
Ghg Emissions ◽  
Resource Assessment ◽  
Offshore Wind ◽  
Energy Yield ◽  
North West ◽  
North East ◽  
Prevailing Wind Direction ◽  
Wind Resource

This paper, to the best of author's knowledge, presents the first wind resource assessment for offshore-wind energy off the mainland coasts of Saudi Arabia, despite the onshore wind resource being known. The study utilized wind speed data from, in effect, an offshore meteorological station to study the annual and seasonal variation of wind speed, wind speed frequency distribution, energy yield and consequent opportunity for reduction in green house gases (GHG) emissions. These results were compared with contemporaneous data from a mainland location ∼ 10 km inland at the same longitude Energy yields were calculated using HOMER and RetScreen models. The annual mean wind measured at Abu Ali Island, the offshore location, was 5.43 m/s. This is larger than the 4.9 m/s measured over the same period at Abu Kharuf, the nearby inland location. Larger wind speeds were found in winter months than in summer months at both locations. At Abu Ali Island, the power of the wind could be extracted for 75% of the time at hub-height of 60 meters using modern wind machines of cut-in-speed 4 m/s, in comparison with 60% of time at Abu Kharuf. The prevailing wind direction was found to be North (N), North West (NNW) and North East (NNE).

scholarly journals Characteristics of Mediterranean Sea Water in Vicinity of Tangier Region, North of Morocco

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1291 ◽  
Author(s):  
Imane Bourouhou ◽  
Farida Salmoun ◽  
Yusuf Gedik
Keyword(s):  
Coastal Waters ◽  
Sea Water ◽  
Present Situation ◽  
Coastal Areas ◽  
Marine Resources ◽  
Bacteriological Study ◽  
The Social ◽  
Seawater Quality ◽  
The Mediterranean

Coastal areas play a crucial role in maintaining the ecological balance of ecosystems and developing the social and economic wellbeing of the countries bordering it. However, the pressure on both terrestrial and marine resources, the use of oceans as a wastes deposit, the growth of population and the increasing of urbanization and human activities in coastal areas are all causes for marine and coastal degradation. The present situation constitutes a significant danger in many places. As an example, the pollution of the coastal waters in the Mediterranean has increased in recent years. Industrialization, tourism and ports activities along the coastline of the Mediterranean are the main sources of many pollutants that have effects on human’s health and environment. So that, it is very important to examine seawater quality in order to protect the marine and coastal areas from degradation. Hence, comes the need to consider a physicochemical and bacteriological study to evaluate the quality of Tangier coastal seawater using the Water Quality Index (WQI). A campaign of 25 sampling points was conducted and the results of the WQI calculation have highlighted the Tangier water was between medium and bad.

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