• Title/Summary/Keyword: Wind rose

Search Result 68, Processing Time 0.028 seconds

A Study on Development of Wind-Rose software for Planning Runway Direction at an Airport (활주로 방향설정을 위한 풍배도 프로그램의 개발 연구)

  • Sin, D.J.;Kim, D.H.
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.17 no.1
    • /
    • pp.39-45
    • /
    • 2009
  • An Analysis of wind is essential for planning runway direction. As a general rule, the principal traffic runway at an airport should be oriented as closely as practicable in the direction of the prevailing wind. Aircraft are able to maneuver on a runway as long as the wind component at right angles to the direction of landing and taking-off, the cross wind component, is not excessive. ICAO recommends that runway be oriented so that aircraft may be landed at least 95% of the time with allowable cross wind components not exceeding specified limits based upon the airport reference field length. Based on the recommendation, the direction of the runway or runways at an airport can be determined through graphical vector analysis on wind rose. This study is to develop the wind-rose software for planning the optimum runway direction at an airport with the raw wind data based on reliable wind distribution statistics that extend over as long as a period as possible, preferably of not less than 5 years.

  • PDF

Comparative Analysis of Commercial Softwares for Wind Climate Data Analysis (풍력자원 계측자료 분석용 상용 소프트웨어 비교분석)

  • Kim, Hyun-Goo
    • New & Renewable Energy
    • /
    • v.6 no.2
    • /
    • pp.5-11
    • /
    • 2010
  • This paper reviews three commercial softwares for wind climate data analysis in wind resource assessment; WAsP/Observed Wind Climate, WindRose and Windographer. Windographer is evaluated as the best software because of its variety of input data format, analysis functions, easiness of user interface, etc. For a quantitative understanding of uncertainty depending on software selection, a benchmark is carried out with the met-mast observation dataset at the Gimnyeong Wind Turbine Performance Test Site. It is found that Weibull parameter calculation and air density correction have a dependency on the software so that such uncertainty should be considered when an analysis software is selected. It is confirmed that annual energy production calculated by WAsP using a statistical table of frequency of occurrence may have some error compared to a time-series calculation method used by the other softwares.

Automated CFD analysis for multiple directions of wind flow over terrain

  • Morvan, Herve P.;Stangroom, Paul;Wright, Nigel G.
    • Wind and Structures
    • /
    • v.10 no.2
    • /
    • pp.99-119
    • /
    • 2007
  • Estimations of wind flow over terrain are often needed for applications such as pollutant dispersion, transport safety or wind farm location. Whilst field studies offer very detailed information regarding the wind potential over a small region, the cost of instrumenting a natural fetch alone is prohibitive. Wind tunnels offer one alternative although wind tunnel simulations can suffer from scale effects and high costs as well. Computational Fluid Dynamics (CFD) offers a second alternative which is increasingly seen as a viable one by wind engineers. There are two issues associated with CFD however, that of accuracy of the predictions and set-up and simulation times. This paper aims to address the two issues by demonstrating, by way of an investigation of wind potential for the Askervein Hill, that a good level of accuracy can be obtained with CFD (10% for the speed up ratio) and that it is possible to automate the simulations in order to compute a full wind rose efficiently. The paper shows how a combination of script and session files can be written to drive and automate CFD simulations based on commercial software. It proposes a general methodology for the automation of CFD applied to the computation of wind flow over a region of interest.

Development of Web-Based Wind Data Analysis System for HeMOSU-1 (웹기반 해모수-1 풍황자료 분석 시스템 개발)

  • Ryu, Ki-Wahn;Park, Kun-Sung;Lee, Jong-Hwa;Oh, Soo-Yun;Kim, Ji-Young;Park, Myoung-Ho
    • Journal of Wind Energy
    • /
    • v.4 no.1
    • /
    • pp.60-67
    • /
    • 2013
  • A web-based program was developed for analyzing weather and structure data from the HeMOSU-1 offshore meteorological mast installed by the KEPCO Research Institute, and 35 km west-southwestward away from Gyeokpo located in Jeonbuk province. All of the measured data are obtained through the data transmitter and the server systems equipped on the HeMOSU-1 and the aerodynamic laboratory in Chonbuk National University respectively. The dualised server system consists of two servers, one is for logging the 1 second based raw data with 10 minute averaged values, and the other is for managing web page with processed weather data. Daily or weekly 10-min averaged data can be provided based on the input date by users. Processed weather data such as wind rose, Weibull distribution, diurnal distribution, turbulence intensity according to wind speed, wind energy density, and so forth are visualized through the web page which would be both useful and informative for developing the wind farm or designing a wind blade for the wind farm nearby southwest sea around the Korean Peninsula. The URL for this web page is http://www.hemosu.org/.

High-Resolution Flow Simulations Around a Steep Mountainous Island in Korea Using a CFD Model with One-way Nested Grid System

  • Mun, Da-Som;Kim, Jae-Jin
    • Korean Journal of Remote Sensing
    • /
    • v.36 no.4
    • /
    • pp.557-571
    • /
    • 2020
  • High-resolution flows around a steep mountainous island (Ulleungdo) in Korea were simulated by a computational fluid dynamics (CFD) model. To cover entire Ulleungdo and to resolve the topography around the Ulleungdo automatic synoptic observing system (ASOS) with high resolution, one-way nested grid system with large (60 m), and small (20 m) grid sizes was applied in the CFD model simulations. We conducted the numerical simulations for 16 inflow directions, and, for each inflow direction, we considered six different wind velocities(5, 10, 15, 20, 25, and 30 m s-1) at the reference height (1,000 m). The effects of topography on surface wind observations were well reflected in the observed wind roses for the period of January 01, 2012 ~ December 31, 2016 at the Ulleungdo ASOS and marine buoy. Wind roses at the Ulleungdo ASOS was reproduced based on the CFD simulations. The changes in surface winds at the Ulleungdo ASOS caused by surrounding topography were relatively well simulated by the CFD model. The simulated wind-rose indicated that south-southwesterly and northeasterly were the dominant wind directions, which were also observed at the Ulleungdo ASOS. We investigated the flow characteristics around the Ulleungdo ASOS for northwesterly, south-southwesterly, and northeasterly winds in detail.

The Behavior of Particulate-Bound logic Components and Their Relationships with Meteorological Parameters: Air-Sea Geochemistry of Inorganic and Organic tons in Cheiu Island (이온성분의 환경거동과 기상인자와의 관계: 제주지역을 중심으로 한 유.무기성 이온성분의 대기-해양지화학)

  • 김기현;이강웅
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.14 no.5
    • /
    • pp.479-490
    • /
    • 1998
  • The concentrations of ten inorganic (sodium, chloride, sulfate, ammonia, etc.) and three organic (acetate, formate, and MSA) ions associated with airborne particulate matter were measured from Cheju Island, Korea during the three field intensive campaigns conducted in (1) Sept./oct. 1997 (fall), (2) Dec. 1997 (winter), and (3) April 1998 (spring). The results of our measurements indicated that the concentration levels of most ionic species were decreasing significantly across the three experimental periods. The patterns of concentration reduction were clear as the sum of all cation and anion species changed dramatically across those periods such as 294> 144 > 65 and 193 >96>74 nequiv/m3, respectively. The changes were best explained in terms of the wind rose patterns of the study site. Since our sampling spot is located on the western-end point of Cheju Island, it is likely to reflect the effects of diverse sources such as natural, marine processes during NW and local non-maritime ones during SE winds. .Hence, the periodical changes in ionic concentrations may be accounted for by the comparable changes in wind direction. To further investigate environmental characteristics of these ionic components, correlation analysis was conducted not only between meteorological and ion data but between different ion-pairs. The results of these analyses confirm that the concentration levels of ionic species are strongly affected by wind speed and temperature and that there are certain patterns between ion species to which such effects apply. In light of the significance of the wind rose patterns in the area, we further extended these analyses into four data groups that were divided on the basis of wind direction. The results of these analyses showed that the strength of correlations between important pairs (e.g.:. between windspeed and most of major inorganic species including sodium and chloride) can be ranked on the distribution of major ions are very diverse, depending on data grouping scheme for such analysis. The results of this study thus suggest that environmental behavior of chemical components be analyzed in various respects, rather than simple standard, especially if measurements are made in complex environmental condition under which both natural and anthropogenic effects are competing each other.

  • PDF

Offshore Wind Resource Assessment around Korean Peninsula by using QuikSCAT Satellite Data (QuikSCAT 위성 데이터를 이용한 한반도 주변의 해상 풍력자원 평가)

  • Jang, Jea-Kyung;Yu, Byoung-Min;Ryu, Ki-Wahn;Lee, Jun-Shin
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.37 no.11
    • /
    • pp.1121-1130
    • /
    • 2009
  • In order to investigate the offshore wind resources, the measured data from the QuikSCAT satellite was analyzed from Jan 2000 to Dec 2008. QuikSCAT satellite is a specialized device for a microwave scatterometer that measures near-surface wind speed and direction under all weather and cloud conditions. Wind speed measured at 10 m above from the sea surface was extrapolated to the hub height by using the power law model. It has been found that the high wind energy prevailing in the south sea and the east sea of the Korean peninsula. From the limitation of seawater depth for piling the tower and archipelagic environment around the south sea, the west and the south-west sea are favorable to construct the large scale offshore wind farm, but it needs efficient blade considering relatively low wind speed. Wind map and monthly variation of wind speed and wind rose using wind energy density were investigated at the specified positions.

Analysis of Upper- and Lower-level Wind and Trajectory in and from China During the P eriod of Occurrence of Migratory Insect Pests of South Korea (비래해충 발생기간 중국 발원지 바람 및 한반도 유입 궤적 분석)

  • Jung-Hyuk Kang;Seung-Jae Lee;Joo-Yeol Baek;Nak-Jung Choi
    • Korean Journal of Agricultural and Forest Meteorology
    • /
    • v.25 no.4
    • /
    • pp.415-426
    • /
    • 2023
  • In this study, the horizontal and vertical structure of wind speed and wind direction were analyzed at the origin of migratory insect pests in China. Wind rose analysis was carried out using the Land-Atmosphere Modeling Package (LAMP) - WRF data, which has the spatiotemporal resolution of about 20 km and 1 hour intervals. Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) was employed for backward trajectory analysis between South Korea and Southeastern China with Global Data Assimilation System (GDAS). The research interest date is July 16, when rice planthopper and leafhopper were observed at the same time. In order to examine where a jet stream occurs in the vertical in source regions and South Korea during the period (July 8 to July 17 in 2021), three-dimensional wind information was extracted and analyzed using the east-west, north-south, and vertical component wind data of the LAM P. The vertical distribution of wind showed that the wind changed in favor of the inflow of migratory insect pests during the period. As a result of analyzing the wind rose, about 30% or more of the wind at a point close to South Korea was classified into the low-level jet stream. In addition, majority of the wind directions for the low-level jet streams (rather than high-level jet streams) at the five origin sites were heading toward South Korea and even Japan, and this was supported by the HYSPLIT-based backward trajectory analysis.

A Study on a Wind Turbine Data Logger System based on WiFi for Meteorological Resource Measurement (기상자원 측정을 위한 와이파이 기반의 풍력용 데이터로거 시스템에 관한 연구)

  • Jung, Se-Hoon;Sim, Chun-Bo
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.10 no.1
    • /
    • pp.55-64
    • /
    • 2015
  • Wind turbine market is showed height growth rate of about 30% for year, and is increasingly growing. Total rate of domestic wind turbine installation is showing share of 0.2% of the global market that is 380MW. However, wind turbine installed in domestic are foreign product more than 90%. Similarly, Datalogger of pretest system for ocean wind turbine plant installation has been leaked huge cost to abroad by mostly abroad company product. In this paper, we proposed pretest weather resource measurement system for efficiency and investment cost cutting of wind turbine construction work. Preset weather resource measurement system is ocean weather resource measurement datalogger based on wireless communication(wifi) that have consist of hardware and software(wind rose) that is able to monitoring as datalogger of wireless bridge and battery state, wind direction, wind speed, temperature, humidity, radiation around weather tower and is able to analysis of measured data.

Preliminary Evaluation of Sources of Ambient Trace Metals using Wind Speed and Wind Direction (풍속과 풍향을 이용한 대기중 미량금속의 오염원에 대한 예비적인 추정)

  • 장미숙;이진홍
    • Proceedings of the Korea Air Pollution Research Association Conference
    • /
    • 2002.04a
    • /
    • pp.55-56
    • /
    • 2002
  • 풍속과 풍향은 지역의 오염원 추정에 중요한 변수가 되므로 풍속에 따른 오염물질 농도 및 풍향을 고려한 pollution rose를 통해 기상조건과 오염물질 농도의 관련성을 분석하고, 대상 지역의 오염원을 개괄적으로 추정하고자 한다. (중략)

  • PDF