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winddirection, etc ; air; air quality; air temperature; microclimate; particulates; primary pollutants; spatial distribution; wind speed; winter; China; Show all 11 Subjects
Abstract:
... The vertical distribution of air pollutants in urban street canyons is closely related to residents’ health. However, the vertical air quality in urban street canyons has rarely been assessed using field observations obtained throughout the year. Therefore, this study investigated the seasonal and annual concentrations of particulate matter (PM₂.₅ and PM₁₀), CO, NO₂, SO₂, O₃, air quality index, an ...
winddirection, etc ; bioacoustics; extinction; landscapes; microphones; Show all 5 Subjects
Abstract:
... To date, there are no published guidelines on how to optimally install recorders on sloped terrain, although slope could potentially affect a recorder’s detection space. This study experimentally investigated the effect of microphone orientation in relation to slope of recorders from two cost classes. We installed four recorders at each plot centre (n = 16), oriented either parallel or perpendicul ...
winddirection, etc ; aerodynamics; energy; torque; wind turbines; Show all 5 Subjects
Abstract:
... Dynamic yawing caused by wind direction variation is an important operating case for wind turbines. Because experimental data are lacking, existing studies assume that the rotor speed and pitch angle are constant, which cannot reflect the actual working states of wind turbines in the short-time variation of the wind direction. In this study, the rotor speed and power characteristics of wind turbin ...
winddirection, etc ; climatology; spring; wind speed; China; Show all 5 Subjects
Abstract:
... This study mainly presents the spatiotemporal characteristics and changes of near-surface wind speed with observations from 679 stations over China for 1979–2019. Furthermore, mechanisms of the wind speed changes are also investigated. Major results show that the larger near-surface wind speed mainly occur in northern and eastern regions, Tibetan Plateau and the coastal zones in China. The wind sp ...
winddirection, etc ; algal blooms; databases; models; risk; Florida; Show all 6 Subjects
Abstract:
... An accurate forecast of the red tide respiratory irritation level would improve the lives of many people living in areas affected by algal blooms. Using a decades-long database of daily beach conditions, two conceptually different models to forecast the respiratory irritation risk level one day ahead of time are trained. One model is wind-based, using the current days’ respiratory level and the pr ...
winddirection, etc ; advection; gravity; mathematical models; research; temperature; Show all 6 Subjects
Abstract:
... During the International Collaborative Experiments for the Pyeongchang 2018 Olympic and Paralympic winter games (ICE-POP 2018), a strong windstorm occurred on the lee side of the Taebaek Mountains on 14 February 2018, when a low-pressure system passed through the northern part of the Korean Peninsula. At that time, a prevailing westerly wind with warm advection and an inversion layer at the top of ...
winddirection, etc ; energy; models; turbulent flow; wind turbines; Show all 5 Subjects
Abstract:
... Savonius-type vertical axis wind turbine (SWT) has several characteristics appropriate for urban usage: low rotational speed, low noise, easy self-starting; but also has a low power coefficient. One of the methods to improve the SWT efficiency is to use fixed deflector blades, but this makes the SWT performance sensitive to wind direction. This paper performs a robust optimization of deflector bla ...
winddirection, etc ; geophysics; models; rain; regression analysis; wind speed; Show all 6 Subjects
Abstract:
... The space-borne microwave radiometers and scatterometers can effectively measure global sea surface winds under non-precipitation. However, the measurements in rainy conditions significantly degrade, which are usually flagged as poor quality or invalidated for some scientific purposes. This paper develops a combined active–passive wind vector retrieval model for rainy conditions based on the HY-2B ...
winddirection, etc ; air pollution; particulates; pollution control; technology; wind speed; Show all 6 Subjects
Abstract:
... How to effectively purify fine particles from the atmosphere has always been the key and difficult point in atmospheric pollution prevention and control. This paper reported a new capture technology for haze particles based on the particle sink effect. The capture characteristics of haze particles and haze removal effect were analyzed in detail. The results showed that particulate matter concentra ...
winddirection, etc ; coal; dust; equipment; fluid mechanics; pollution; research; roads; Show all 8 Subjects
Abstract:
... To investigate the influence of dust produced by multi-dust sources at a fully mechanized mining face with a large mining height on the safety conditions in a coal mine, the No. 22305 fully mechanized mining face of the Bulianta coal mine was considered as the research object in this study, and the space–time evolution of dust was analyzed with computational fluid dynamics (CFD). The wind flow sim ...
winddirection, etc ; air; air pollution; algorithms; land; temperature; urbanization; vegetation; Show all 8 Subjects
Abstract:
... With the rapid development of urbanization, various urban problems such as air pollution, urban heat islands, poor ventilation, and so on have followed. Ventilation corridors can improve the internal ventilation conditions of a city and can effectively alleviate these urban problems. Taking Kaifeng as an example of a medium-sized city, this study used meteorological analysis and remote sensing (RS ...
winddirection, etc ; canopy; face; meteorology; momentum; prediction; turbulent flow; vegetation; Show all 8 Subjects
Abstract:
... Good representation of turbulence in urban canopy models is necessary for accurate prediction of momentum and scalar distribution in and above urban canopies. To develop and improve turbulence closure schemes for one-dimensional multi-layer urban canopy models, turbulence characteristics are investigated here by analyzing existing large-eddy simulation and direct numerical simulation data. A range ...
Stephan Jung; Ye Yuan; Maria Stange Del Carpio; Thomas Pawlik; Stephan Hartmann; Nicole Estrella; Jose Oteros; Claudia Traidl-Hoffmann; Athanasios Damialis; Jeroen Buters; Annette Menzel
winddirection, etc ; databases; grasses; grasslands; land; land use; pollen; Germany; Show all 8 Subjects
Abstract:
... Meteorological conditions and the distribution of pollen sources are the two most decisive factors influencing the concentration of airborne grass pollen. However, knowledge about land-use types, their potential pollen emission, and the importance of local sources remains limited. In this study, wild grass pollen concentrations from 27 stations in Bavaria, Germany, were linked to potential pollen ...
winddirection, etc ; administrative management; energy conversion; wind farms; wind speed; Show all 5 Subjects
Abstract:
... The wake regulation by cooperative yaw control, axis induction control, or their combination can significantly improve the total power output of wind farms. However, a comprehensive study of the three control strategies is still lacking, which hinders their engineering applications. To this end, the optimized yaw angles, induction factors, and total power promotion are systematically compared for ...
winddirection, etc ; air flow; heat transfer; mathematical models; wind speed; Show all 5 Subjects
Abstract:
... A numerical model by coupling Monte Carlo Ray Tracing (MCRT) and Computational Fluid Dynamics (CFD) was built to explore the convective heat loss of a cylindrical receiver with built-in coiled tube. Noted that the non-uniform heat flux boundary of the receiver was obtained by optical simulation and the effect of existence of the dish concentrator was taken into account. The variation of flow field ...
winddirection, etc ; climate; dynamics; monsoon season; spring; summer; wind speed; China; Show all 8 Subjects
Abstract:
... From spring to summer, the East Asian summer monsoon (EASM) rainband migrates northwestward. During summer, East Asian countries experience extensive precipitation due to the EASM rainband, but the springtime monsoon rainband lies over the Pacific. The seasonal evolution of the EASM rainband is influenced by the mechanical effect of the Tibetan Plateau, and seasonal changes in the westerly wind sp ...
winddirection, etc ; buildings; fire safety; height; journals; storms; structural roofs; testing; Show all 8 Subjects
Abstract:
... Results are presented for tests of ember accumulation on buildings during an ember storm. Specifically, the experiments investigate the role of upstream buildings on the accumulation of embers on the rooftops of a building. Experiments were run for three target buildings for three different wind directions per building. The upstream array of buildings varied in both layout (staggered and regular g ...
winddirection, etc ; mountains; radar; rain; remote sensing; stakeholders; Andes region; Colombia; Show all 8 Subjects
Abstract:
... In tropical regions, deep convective systems are associated with extreme rainfall storms that usually detonate flash floods and landslides in the Andean Colombian region. Several studies have used satellite data to address the structure and formation of tropical convective storms. However, there is a local gap in the characterization, which is essential for a better understanding of flash floods a ...
winddirection, etc ; aerodynamics; batteries; energy; wind speed; wind tunnels; wind turbines; Show all 7 Subjects
Abstract:
... Vertical-axis wind turbines are considered to be a better choice for cities and isolated semi-urban areas. However, it is difficult to control their power outputs, especially at high wind speeds, which can potentially cause damage to the generator or the wind turbine structures. In this study, a tree-shaped quad-rotor wind turbine with an active yaw system was proposed to not only effectively cont ...
winddirection, etc ; climate; climate change; dynamics; summer; uncertainty; weather forecasting; winter; Show all 8 Subjects
Abstract:
... For those involved in planning for regional and local scale changes in future climate, there is a requirement for climate information to be available in a context more usually associated with meteorological timescales. Here we combine a tool used in numerical weather prediction, the 30 weather patterns produced by the Met Office, which are already applied operationally to numerical weather predict ...