wave direction Articles
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Comparison of Directional WaveGuide Radar with Directional WaveRider Buoy
Abstract Down looking FMCW radars for measuring water level, tides and wave height have been in use for 25 years. A combination of three down looking FMCW radars, mounted on an o↵ shore location, can be used to accurately measure ocean wave height and wave direction. At locations where an o↵shore mounting construction is readily available, the major advantage of this relatively new ...
By Radac BV
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Sea wave propagation from offshore to Maputo's coast. Application to longshore sediment transport assessment
This study aims to characterize the wave climate near the coastal region of Maputo (Mozambique), and to provide a first assessment of the sediment transport load in this area. A time-series of 13 years' worth of offshore wave data, obtained from reanalysis products, was propagated to the coast. Wave propagation was performed using Linear Wave theory and the numerical model, Simulating ...
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Valuable met-ocean data for the Port of Rotterdam Real time current and wave data from HF Radar WERA
To fulfill its mission to “continually improve the Port of Rotterdam and to make it the safest, most efficient and most sustainable port in the world“, Rijkswaterstaat, part of the Ministry of Infrastructure and Environment, decided in 2014 to improve the quality and reliability of the ocean current forecasting. The forecasting is based on a hydrodynamic model operated by ...
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ANFIS and ANN models for the estimation of wind and wave-induced current velocities at Joeutsu-Ogata coast
In this study, the adaptive network-based fuzzy inference system (ANFIS) and artificial neural network (ANN) were employed to estimate the wind- and wave-induced coastal current velocities. The collected data at the Joeutsu-Ogata coast of the Japan Sea were used to develop the models. In the models, significant wave height, wave period, wind direction, water depth, incident wave angle, and ...
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Intercomparison of a WaveGuide radar and two Directional Waveriders
Down-looking FMCW radars for wave measurements are in use already for 25 years. They have proved to be very robust and maintenance is hardly needed. Now the prices of FMCW radars came down they are being more widely applied for water level, tide, harbour oscillations and wave height at sea, lakes and rivers. Radacs WaveGuide was introduced in 1998 based upon a commercial tank radar, first Enrafs ...
By Radac BV
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Ultrasonic Characterization of Porosity In Powder Metals
Abstract We present preliminary results of a project aimed at investigating ultrasonic techniques to measure the bulk density, pore size, and spatial variation of porosity in powder metal specimens. Specific techniques considered are ultrasonic wavespeed, attenuation and wave dispersion measurements, and the identification of spectral features in the amplitude spectra. Also discussed is the ...
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Measuring Sound Absorption: Considerations on the Measurement of the Active Acoustic Power
For the measurement of the sound absorption coefficient a large number of methods is available. These methods have in common that all of them rely on an overall sound Held model, i.e. a model that describes the whole sound field in front of the surface under investigation. Examples are the diffuse sound field model in the reverberation room method according to ISO 354 [ 1 ] and the plane wave ...
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Hydraulic transient wave separation algorithm using a dual-sensor with applications to pipeline condition assessment
Over the past two decades, techniques have been developed for pipeline leak detection and condition assessment using hydraulic transient waves (i.e. water hammer waves). A common measurement strategy for applications involves analysis of signals from a single pressure sensor located at each measurement site. The measured pressure trace from a single sensor is a superposition of reflections ...
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The origin and type of wind speed sensor
backgroundAn anemometer is an instrument used to measure wind speed and direction. It is a critical tool for meteorologists, engineers, and researchers who need to gather information about atmospheric conditions. Anemometers come in various types, but they all work based on the same principle of detecting the wind's pressure and translating it into a measurable quantity. In this article, we will ...
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Remote Ocean Sensing by HF Radar
Coastal radar has become an increasingly important monitoring tool for hazard management and environmental protection During the past few years remote ocean sensing by HF (highfrequency) radar has become more and more valuable to modern coastal management. lt offers an insight into the dynamics of the coastal seas for a variety of applications without ever leaving dry land. For example, search ...
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Transient and surge related pipe bursts, water loss and damage prevention
Pipe bursts as a result of transients and surges within a piping network are very common problems throughout the world. Not only are the maintenance costs of these repairs extremely expensive, but when you add in possible litigation for third party damages, combined with the potentially significant value (cost) of the lost water, you can quickly realize the significance of what may appear simply ...
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Wind Turbine Nondestructive Testing: What You Need to Know
Wind turbines are a growing source of renewable energy as nations around the world grow more conscious about energy consumption. According to the U.S. Department of Energy, wind could comprise 35% of the U.S. energy supply. With the increased use of turbines also comes the need to draft regular inspection procedures that can detect defects on a profound level. There are many components of wind ...
By Zetec, Inc
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Acoustic cleaning system for electrostatic precipitator of 600MW boiler
Summary: in this article, we give analysis to the design and model selection of acoustic cleaning system for the ESP (electrostatic precipitator) of 600MW boiler fire by lignite. We come up with the design & operation parameter for acoustic cleaning system. This article provides reference for successful application of sonic horn to remove soot deposit in ESP. 1. Case Description In this case, ...
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Introduction to ultrasonic wind speed and direction sensors
Introduction of Works: Ultrasonic wind speed and direction sensors are devices used to measure wind speed and direction in a variety of applications, from weather forecasting to wind power generation. Unlike conventional wind sensors, which rely on moving mechanical parts, ultrasonic sensors use sound waves to detect wind speed and direction. This makes them more accurate, reliable and durable ...
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Working principle and advantages of ultrasonic wind speed and direction sensor
background Ultrasonic wind speed and direction sensor. It is a wind direction measuring instrument developed based on the principle of ultrasound. Use the transmitted sound pulses. Measure the time or frequency difference at the receiving end to calculate the wind speed and direction. It is widely used in the measurement of wind direction and speed in greenhouses, environmental protection, ...
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Water hammer (hydraulic shock) causes and preventative measures
Water hammer (or hydraulic shock) is the momentary increase in pressure inside a pipe caused by a sudden change of direction or velocity of the liquid in the pipe. Water hammer can be particularly dangerous because the increase in pressure can be severe enough to rupture a pipe or cause damage to equipment. Therefore, the proper opening and closing of valves is fundamental to safe pipeline ...
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Hydrodynamic performance of retrofitted offshore structures using perforated cylinders
Direct impact caused by the waves on ocean structures can be efficiently reduced by encompassing the member with a perforated cover. One of the successful attempts to reduce wave forces on the damaged members is using perforated outer cover on a damaged member. Experimental investigations are carried out on perforated outer cylinder encompassing the inner cylinder for different perforation ratios ...
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Response of frames seismically protected with passive systems in near–field areas
The present paper analyses the behaviour of moment resisting frames in reinforced concrete subject to earthquakes recorded in near–field areas. In these areas, the signals show impulsive–type accelerograms, with velocity and displacement peaks higher than in far–field zones especially for the fault–normal component of the ground motion velocity in the direction of propagation of the wave, which ...
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Model output data integration using a Web Map Server
Maps are one of the basic products that can be created from numerical model output data. Whether numerical weather prediction models, air quality photochemical models, air dispersion models, wave models or any other, it is useful to show in a map different fields like the air temperature, wind speed and direction, pollutants concentration, significant wave height or any other variable obtained ...
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Reaching underground resources
Accessing critical resources such as geothermal energy and natural gas requires drilling — an expensive, energy-intensive, messy process with today's technology. An MIT team has been looking into a more elegant approach. Instead of grinding rock to bits, they would use a continuous beam of energy to vaporize it and then blow out the tiny particles that form with a high-pressure stream of ...
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