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28 May 2019Predicting disruptive wind shear at Hong Kong Airport using FLOWSTAR

CERC and Hong Kong Observatory continue to work towards developing a new system for real-time prediction of wind speed and direction for Hong Kong Airport.

Where airports are located adjacent to hilly terrain, flights are periodically disrupted by turbulent air flow. The meteorological conditions experienced by pilots landing at Hong Kong International Airport on the island of Chek Lap Kok are affected by the nearby Lantau Island's extensive mountainous terrain. Various attempts have been made to forecast weather conditions at a resolution that could assist decision-making. However, regional models fail to resolve such small-scale events, and super high resolution numerical weather prediction models need too much configuration for a near real-time system.

Recent results published in the Royal Meteorological Society's 'Meteorological Applications' journal show how CERC's FLOWSTAR model predicts the strong wind shear associated with flow structures such as rotors. An advantage of FLOWSTAR is that multiple possible solutions may be calculated quickly to account for uncertainty in model input.

Figure 1 shows cross-sections of the modelled flow along the red ESE line shown in Figure 2, which itself shows the horizontal wind flow at a height of 100 m above terrain in the vicinity of the airport and Lantau Island; the prevailing wind is easterly.

14 May 2019Spring 2019 editions of ADMS Model Newsletters now available

Catch up on ADMS model news in the Spring 2019 editions of ADMS 5 & ADMS-Screen News and ADMS-Urban & ADMS-Roads News which are now available. The newsletters are published approximately twice a year and include the latest news about the ADMS models, the annual User Group Meetings, CERC activities, training courses and recently published papers as well as a page of useful modelling tips. Previous editions of the newsletters are available here.

13 May 2019EFT 9.0 in ADMS-Roads and ADMS-Urban

The UK Department for Environment, Food & Rural Affairs and the Devolved Administrations have released version 9.0 of the Emissions Factors Toolkit (EFT). Details of the updates in this new version are given on page 5 of the EFT user guide.

We are currently incorporating the new data into ADMS-Roads, ADMS-Urban and ADMS-Airport. We anticipate releasing a patch to version 4.1 of these models in June, which will allow use of EFT 9.0 emissions factors.

The new version of EFT includes the effect of loading and gradients on Heavy Duty Vehicles. These features will be made available in version 5, which will be released later this summer.

30 Apr 20192019 ADMS User Group Meetings to be held in Oxford, 13-14 November

We are pleased to announce that the 2019 User Group Meetings will be held at St Anne's College, Oxford on the 13th and 14th of November.

  • ADMS 5 User Group Meeting: Wednesday 13th November
  • ADMS-Urban and ADMS-Roads User Group Meeting: Thursday 14th November

These meetings will include the usual mix of presentations by CERC staff and software users and are the ideal opportunity to hear the latest news and advice on new model features. Users with a valid support contract are entitled to a number of free or reduced-rate delegate places depending on the type of licence held. Please contact CERC if there is a topic you would like to be covered at one of the meetings or if you would like to give a 'user view' presentation. More details will be published later in the year; registration will open online in the summer.


10 Apr 2019London air quality: modelling Brent's proposed new Energy Centre

The CERC consultancy team investigated the air quality impact of a proposed Energy Centre, comprising boiler and CHP plant, in the London Borough of Brent.

Brent Council is procuring a district energy network as part of their South Kilburn regeneration project. The associated Energy Centre will include four boilers and up to two CHP units. Two new apartment buildings will be built close to the Energy Centre stack, one of 14 storeys and the other 8 storeys. Emissions from the Energy Centre stack have the potential to impact on the facades of these buildings. The Energy Centre and apartment buildings are located within an Air Quality Management Area (AQMA) declared by Brent Council for 24-hour average particulate (PM10) and annual average NO2 concentrations.

ADMS 5 was used to carry out dispersion modelling of emissions of nitrogen oxides from the flues. Concentrations of NO2 were calculated on a high-resolution grid centred on the Energy Centre, as well as at the facades of the nearby apartment buildings.

The Environmental Protection UK and Institute of Air Quality Management's Land Use Planning & Development Control: Planning for Air Quality was used to assess the significance of the air quality impacts of the Energy Centre emissions at locations relevant for public exposure. At ground level receptors, the modelled impacts are classified as Negligible; at elevated receptors, the modelled impacts are classified as Slight.

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