Dr' Hazel Peace, CATE, Dalton Research Institute

1
LASPORT test example

• Dr. Hazel Peace, CATE, Dalton Research Institute

2
INTRODUCTION

• 3 windows
• Menu
• Input
• Info

3
PROJECT

• Initially, scale map
• Followed by in Project enter
• Source types
• Pollutants
• Start/end dates
• Terrain option
• Scenario or monitor option (refers to generalised
  aircraft or individual)

4
OBJECTS

• Next need to enter source locations in
  Projects, Objects
• Load relevant map
• Select source type and new

5
OBJECTS

• Input parameters as shown
• Once applied data written to site.csv colon
  delimited.
• NB need to first define marker points (vertices)
  for taxiways and roads before entering parameters

6
TRAFFIC

• Further details of sources can now be entered
• Aircraft numbers
• Aircraft groups (size)
• Road vehicle numbers
• Diurnal variation etc for different source types

7
LTO

• Climbout, takeoff and approach profiles can be
  set for each aircraft group size
• Taxi speed ands idle time set via Parameter
  section

8
EMISSIONS

• Emission factors set for each source group.
  (Defaults are available linked to ICAO db and
  German Rd EFs)

9
MET DATA

• Hourly sequential met data file used, which
  contains velocity, direction, Monin Obukhov
  length.
• Additionally specify
• roughness length
• displacement height
• location

10
PARAMETERS

• Enter
• no. particles (i.e. no per sources per hour)
• Quality mass per particle
• Maxima highest 28 values per cell
• Taxi speed and waiting time (aircraft)
• Emission ceiling
• NO2 ratio

11
CALCULATION AREA

• Up to 6 nested grids allowed
• Need at least factor 2 mesh size between grids
• Coarse grid must contain the finer grid/s

12
ANALYSIS

• Enter units, reference values for year, day and
  hours (i.e. averaging period refer to NO2)

13
EMISSION CALCULATION

• Arrival (set for each aircraft group/size)
• Approach straight (thrust setting Approach) to
  the touch-down point (constant angle/velocity
  defined in climbout profiles)
• Landing (thrust setting Approach) from touch-down
  to roll-off (constant deceleration)
• Taxi (thrust setting Idle) from the roll-off
  point to apron (constant velocity).
• Departure (set for each aircraft group/size)
• Taxi (thrust setting Idle) position area to
  runway (constant velocity).
• Takeoff (thrust setting TakeOff ) (constant
  acceleration).
• Start distance and final velocity of takeoff are
  defined in the climbout profiles.

14
RUN

• Now the dispersion run
• .. Several weeks later

15
RESULTS
16
RESULTS

• Can be outputted as text file (ArcInfo grid
  format) which could be used with other GIS
  packages.

17
PROBLEMS/DISCUSSION

• Run time only know for examples run so far which
  is in the order of 1hr 50 min with 1Gb RAM and 4
  GHz processor or 2hr 22 min with 256 RAM and
  1.7GHz
• Boundary/background model area
• Height emissions included to
• Resolution for monitoring points run time
• Other points surface roughness, Monin Obukhov
  length, traffic data, interpretation of emission
  data.
• Could run on supercomputer???? Appears to be
  written in C.
• Number of sources - limits
• Monitor versus scenario for short term
• Source contribution