Définition des conditions de vagues pour la conception d'un havre de pêche à Sept-îles

1991 ◽  
Vol 18 (5) ◽  
pp. 851-863 ◽  
Author(s):  
Y. Ouellet ◽  
A. Drouin
Keyword(s):  
Key Words ◽  
Numerical Models ◽  
Wave Climate ◽  
Wave Transformation ◽  
Forecasting Model ◽  
Wave Modeling ◽  
Long Period ◽  
Numerical Studies ◽  
Small Craft ◽  
Wave Forecasting

This paper presents the results of numerical studies to define the wave climate inside the Bay of Sept-îles, where it is proposed to build a small craft harbour. This wave climate is relatively complex as it results from waves coming from outside the Bay, that is from the estuary of the St. Lawrence, or generated inside the Bay itself. Such information is required to select the configuration of the harbour and the best location among the various sites proposed. Waves have been recorded at a station outside the Bay in 1966 – 1967 and inside the Bay in 1983. These records were used to calibrate the wave forecasting model based on wind data recorded at Sept-îles airport. They were also used to validate results obtained from a refraction model used to determine wave transformation from outside to inside the Bay. Then waves were forecasted over a long period (1953 – 1984), for the ice-free season, and used to study wave agitation inside different schemes proposed for harbour configuration and site. The study shows that there is a need to obtain better wave information and to improve the numerical models. Key words: wave forecasting, wave transformation, wave records, wave modeling, harbor, Sept-îles.

scholarly journals Model Transformasi Gelombang di Pelabuhan Patimban, Kabupaten Subang dengan Tiga Skenario

2020 ◽  
Vol 9 (4) ◽  
pp. 485-494
Author(s):  
Rifka Pramesti Asa Rachmawatie ◽  
Baskoro Rochaddi ◽  
Elis Indrayanti
Keyword(s):  
Wave Height ◽  
Field Research ◽  
Field Measurements ◽  
Wave Transformation ◽  
Refraction Coefficient ◽  
Hydrodynamic Models ◽  
Wave Modeling ◽  
Wave Data ◽  
Simulation Results ◽  
Wave Forecasting

Pembangunan dermaga dan breakwater (pemecah gelombang) di Pelabuhan Patimban, Kabupaten Subang, Jawa Barat dapat mengakibatkan transformasi gelombang di perairan sekitarnya. Pemodelan transformasi gelombang penting untuk memberikan informasi sekaligus memprediksi seberapa besar pengaruh pembangunan dermaga dan breakwater terhadap perairan di sekitarnya. Tujuan dari penelitian adalah untuk mengetahui ada tidaknya transformasi gelombang dengan menggunakan tiga skenario. Penelitian lapangan dilaksanakan pada Januari sampai Februari 2020. Data yang digunakan adalah data gelombang hasil pengukuran lapangan, data angin, dan data batimetri. Peramalan gelombang dengan menggunakan metode Sverdrup-Munk Bretschneider (SMB). Pemodelan gelombang menggunakan model hidrodinamika untuk mengetahui besar transformasi gelombang. Tiga skenario yang digunakan yaitu skenario 1 (tanpa ada dermaga dan breakwater), skenario 2 (ada dermaga tanpa breakwater), dan skenario 3 (ada dermaga dan breakwater). Hasil simulasi menunjukan bahwa terjadi transformasi gelombang yang meliputi refraksi, refleksi, difraksi dan shoaling di Pelabuhan Patimban, dengan nilai koefisien refraksi tertinggi pada skenario 1. Penurunan tinggi gelombang terjadi pada skenario 2 dan skenario 3. The construction of a pier and breakwater at Patimban Port, Subang Regency, West Java can create wave transformation in the surrounding waters. Wave transformation modeling is  important to provide information as well as predict how much influence the construction of the pier and breakwater will have effect on the surrounding waters. The purpose of this research is to determine the three scenarios effects for wave transformation. Field research was carried out from January to February 2020. The data used were wave data from field measurements, wind data, and bathymetry data. Wave forecasting using the Sverdrup-Munk Bretschneider (SMB) method. Wave modeling uses hydrodynamic models to determine the magnitude of the wave transformation. Three scenarios are used, namely scenario 1 (without a pier and breakwater), scenario 2 (there is a dock without a breakwater), and scenario 3 (there are a pier and breakwater). The simulation results show that there is a wave transformation which includes refraction, reflection, diffraction, and shoaling at Patimban Port, with the highest refraction coefficient value in scenario 1. A reduction in wave height occurs in scenarios 2 and scenario 3.

scholarly journals DEVELOPMENT OF A DEEP-LEARNING BASED WAVE FORECASTING MODEL USING LSTM NETWORK

2020 ◽  
pp. 31
Author(s):  
Thit Oo Kyaw ◽  
Tomoya Shibayama ◽  
Yoko Shibutani ◽  
Yasuo Kotake
Keyword(s):  
Neural Networks ◽  
Deep Learning ◽  
Short Term Memory ◽  
Numerical Models ◽  
Storm Surges ◽  
Forecasting Model ◽  
Feed Forward Neural Networks ◽  
Wave Conditions ◽  
Lstm Network ◽  
Wave Forecasting

Forecasting of wave conditions plays an essential role for offshore construction and maintenance. Recently, machine learning-based wave forecasting models have been developed and their integrated usage with physics-based numerical models has become popular. These studies mostly apply Feed Forward Neural Networks (FFNNs) with an emphasis on prediction of time-series of waves, tides and storm surges. As a particularly different approach, we develop a deep learning-based wave forecasting model using Long Short-Term Memory (LSTM) network under Recurrent Neural Networks. As a case study, the model will be utilized to predict the wave conditions (low or high) near the Tottori Port, Japan.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/oMvIS9zkIOs

scholarly journals IRREGULAR WAVE TRANSFORMATION IN A BOUSSINESO WAVE MODEL

1986 ◽  
Vol 1 (20) ◽  
pp. 205
Author(s):  
H.H. Pruser ◽  
H. Schaper ◽  
W. Zielke
Keyword(s):  
Water Waves ◽  
Wave Equations ◽  
Numerical Models ◽  
Wave Model ◽  
Wave Climate ◽  
Irregular Waves ◽  
Wave Transformation ◽  
Diffraction Reflection ◽  
Irregular Wave ◽  
Wave Models

Numerical wave models for shallow water waves are of particular importance for the calculation of the wave climate in harbours and coastal areas. Especially nonlinear time domain models, which are based on the Boussinesq-Wave- Equations, may be helpful in the future for simulating the interaction of currents with refraction, diffraction, reflection and for simulating shoaling..-of irregular waves in natural areas; a potential which has not yet been fully developed. During the last ten years numerical models, based on these equations, have been published; such as ABBOTT et. al. , HAUGUEL and SCHAPER / ZIELKE . Research on this topic is currently being carried on. Some efforts have been made to verify the capability of the models to describe the various physical phenomena. However, up to now, verification has been limited to regular waves. The aim of this paper therefore is, to consider questions concerning irregular, nonlinear waves.

scholarly journals Process-Based Model Prediction of Coastal Dune Erosion through Parametric Calibration

2021 ◽  
Vol 9 (6) ◽  
pp. 635
Author(s):  
Hyeok Jin ◽  
Kideok Do ◽  
Sungwon Shin ◽  
Daniel Cox
Keyword(s):  
Large Scale ◽  
Numerical Models ◽  
Model Performance ◽  
Coastal Dunes ◽  
Wave Transformation ◽  
Storm Event ◽  
Face Model ◽  
Dune Erosion ◽  
Simulation Performance ◽  
Sand Bar

Coastal dunes are important morphological features for both ecosystems and coastal hazard mitigation. Because understanding and predicting dune erosion phenomena is very important, various numerical models have been developed to improve the accuracy. In the present study, a process-based model (XBeachX) was tested and calibrated to improve the accuracy of the simulation of dune erosion from a storm event by adjusting the coefficients in the model and comparing it with the large-scale experimental data. The breaker slope coefficient was calibrated to predict cross-shore wave transformation more accurately. To improve the prediction of the dune erosion profile, the coefficients related to skewness and asymmetry were adjusted. Moreover, the bermslope coefficient was calibrated to improve the simulation performance of the bermslope near the dune face. Model performance was assessed based on the model-data comparisons. The calibrated XBeachX successfully predicted wave transformation and dune erosion phenomena. In addition, the results obtained from other two similar experiments on dune erosion with the same calibrated set matched well with the observed wave and profile data. However, the prediction of underwater sand bar evolution remains a challenge.

The Research of Energy Conversion and Heat Transfer in the Ceramic Foams of Solar Energy Converter

2011 ◽  
Author(s):  
Yangbo Deng ◽  
Fengmin Su ◽  
Chunji Yan
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Solar Radiation ◽  
Solar Energy ◽  
Numerical Models ◽  
Air Flow ◽  
Energy Converter ◽  
Ceramic Foams ◽  
Numerical Studies ◽  
Flow Through

The solar energy converter in Concentrated Solar Power (CSP) system, applies the solid frame structure of the ceramic foams to receive the concentrated solar radiation, convert it into thermal energy, and heat the air flow through the ceramic foams by convection heat transfer. In this paper, first, the pressure drops in the studied ceramic foams were measured under all kinds of flow condition. Based on the experimental results, an empirical numerical model was built for the air flow through ceramic foams. Second, a 3-D numerical model was built, for the receiving and conversion of the solar energy in the ceramic foams of the solar energy converter. Third, applying two aforementioned numerical models, the numerical studies of the thermal performance were carried out, for the solar energy converter filled with the ceramic foams, and results show that the structure parameters of the ceramic foams, the effective reflective area and the solar radiation intensity of the solar concentrator, have direct impacts on the absorptivity and conversion efficiency of the solar energy in the solar energy converter. And the results of the numerical studies are found to be in reasonable agreement with the experimental measurements. This paper will provide a reference for the design and manufacture of the solar energy converter with the ceramic foams.

scholarly journals Pengaruh Pemberian Sub Soil dan Arang Tempurung Kelapa Terhadap Pertumbuhan Semai Akasia (Acacia mangium. Willd) Pada Media Bekas Tambang Pasir

2019 ◽  
Vol 10 (3) ◽  
pp. 166-172
Author(s):  
Basuki Wasis ◽  
Lastiti Sanubari
Keyword(s):  
Key Words ◽  
Seedling Growth ◽  
Acacia Mangium ◽  
Dry Weight ◽  
Coconut Shell ◽  
Diameter Growth ◽  
Sand Mining ◽  
Significant Treatment ◽  
Long Period ◽  
Coconut Charcoal

Sand mining which continuously done may cause the sand of amount in the bottom of river decreasing and may result, to the destruction of the river if occured for a long period. Revegetation activity must be done on some former sand mining river boundaries. Acacia (Acacia mangium) might be able to grow in low nutrient soil. The purposes of this research is to get information about sub soil and coconut charcoal granting effects towards acacia seedling growth on former sand mining medium.The research showed that the interaction of the added sub soil and coconut shell charcoal is significant to the heightand diameter parameter of acacia seedling while sub soil addition is significant to Dry Weight Total (DWK) parameter. Interaction of 250 g sub soil, 60 g charcoal on 750 g sand is the best treatment to enhance seedling tall growth for about 88.73%. Interaction of 750 g sub soil on 250 g sand is the most significant treatment for diameter parameter for about 71.21% diameter growth. The best treatment for Dry Weight Total (DWK) is shown by interaction of 250 g sub soil and 250 g charcoal on 500 g sand. Charcoal granting independently is not significant to addition acacia seedling growth. The addition of sub soil only showed the best result of 750 g sub soil granting with diameter growth around 71.21%. Key words: Acacia mangium. Willd., charcoal, sand mining, sub soil

scholarly journals Thermo-Viscoelastic Modeling of the Aircraft Tire Cornering

2015 ◽  
Vol 1099 ◽  
pp. 80-86 ◽  
Author(s):  
Iulian Rosu ◽  
Lama Elias-Birembaux ◽  
Frederic Lebon
Keyword(s):  
Thermal Evolution ◽  
Numerical Models ◽  
Frictional Heating ◽  
Mechanical Analysis ◽  
High Speeds ◽  
Numerical Studies ◽  
Deformation Dynamics ◽  
Viscoelastic Modeling ◽  
Fully Coupled ◽  
Tread Rubber

Some numerical models are proposed for simulate the aircraft tire behaviour on the ground in critical situations. Fully coupled thermo-mechanical analysis procedures taking into account finite deformation, dynamics and frictional contact are studied; the visco-elasticity properties of the rubber were identified. A good agreement is observed at moderate speed, thus the model is extrapolated to high speeds and seems able to predict results in cases for which it is not possible to obtain realistic experimental data. In order to understand the thermal evolution of tire tread rubber materials during rolling and skidding steps, new experimental and numerical studies were also realized on tire tread rubber. The aim of this approach is to simulate and understand the effect of frictional heating on the tire behaviour.

scholarly journals Estimation of Irregular Wave Runup on Intermediate and Reflective Beaches Using a Phase-Resolving Numerical Model

2020 ◽  
Vol 8 (12) ◽  
pp. 993
Author(s):  
Jonas Pinault ◽  
Denis Morichon ◽  
Volker Roeber
Keyword(s):  
Time Series ◽  
Best Practices ◽  
Numerical Models ◽  
Laboratory Data ◽  
Irregular Waves ◽  
Wave Transformation ◽  
Model Parameters ◽  
Wave Runup ◽  
Data Set ◽  
Promising Alternative

Accurate wave runup estimations are of great interest for coastal risk assessment and engineering design. Phase-resolving depth-integrated numerical models offer a promising alternative to commonly used empirical formulae at relatively low computational cost. Several operational models are currently freely available and have been extensively used in recent years for the computation of nearshore wave transformations and runup. However, recommendations for best practices on how to correctly utilize these models in computations of runup processes are still sparse. In this work, the Boussinesq-type model BOSZ is applied to calculate runup from irregular waves on intermediate and reflective beaches. The results are compared to an extensive laboratory data set of LiDAR measurements from wave transformation and shoreline elevation oscillations. The physical processes within the surf and swash zones such as the transfer from gravity to infragravity energy and dissipation are accurately accounted for. In addition, time series of the shoreline oscillations are well captured by the model. Comparisons of statistical values such as R2% show relative errors of less than 6%. The sensitivity of the results to various model parameters is investigated to allow for recommendations of best practices for modeling runup with phase-resolving depth-integrated models. While the breaking index is not found to be a key parameter for the examined cases, the grid size and the threshold depth, at which the runup is computed, are found to have significant influence on the results. The use of a time series, which includes both amplitude and phase information, is required for an accurate modeling of swash processes, as shown by computations with different sets of random waves, displaying a high variability and decreasing the agreement between the experiment and the model results substantially. The infragravity swash SIG is found to be sensitive to the initial phase distribution, likely because it is related to the short wave envelope.

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