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********************************************************************************
* *
* Input file for the trajectory model FLEXTRA: Please select your options *
* *
********************************************************************************
'Test run #1' LABEL FOR THE MODEL RUN
1 DIRECTION (1 FORWARD, -1 BACKWARD TRAJECT.)
480000 HHHMISS LENGTH OF AN INDIVIDUAL TRAJECTORY
19980402 120000 YYYYMMDD HHMISS BEGINNING DATE
19980406 150000 YYYYMMDD HHMISS ENDING DATE
060000 HHHMISS TIME INTERVAL BETWEEN STARTING TIMES OF TRAJECTORIES
2 3600 i SSSSS i>0: INTERPOLATED OUTPUT OF TRAJECTORY EVERY SSSSS SECONDS
0 0.5 2.0 0.08 0.08 0.20 NUMBER, DISTANCE (GRID UNITS), TIME CONSTANT (WIND FIELD INTERVAL UNITS) AND INTERPOLATION ERRORS (IN U, V AND W) OF UNCERTAINTY TRAJECT.
1 INTERPOLATION 1 = IDEAL INTERPOLATION >1 = LINEAR INTERPOLATION
5.0 CFL TIMESTEP CRITERION HORIZONTAL AND VERTICAL
5.0 CFLT TIMESTEP CRITERION TIME GAP BETWEEN INPUT WIND FIELDS
3 MODE 1 NORMAL MODE, 2 CET MODE, 3 FLIGHT MODE
==================================================================================
1. Comment to identify the current model run
2. Direction of trajectories (1 means forward trajectories, -1 backward)
3. Temporal lengths of the trajectories in the format HHHMISS, where HHH is
HOUR, MI is MINUTE and SS is SECOND
4. Beginning date and time of trajectory calculation. Must be given in format
YYYYMMDD HHMISS, where YYYY is YEAR, MM is MONTH, DD is DAY, HH is HOUR,
MI is MINUTE and SS is SECOND. All times are in UTC.
5. Ending date and time of trajectory calculation. Same format as 4.
6. Time interval between two trajectory calculations. Same format as 3.
7. Options for the trajectory output:
0 = original data in irregular time intervals
1 = constant time intervals, interpolated output every SSSSS seconds
2 = 0 plus 1
8. Six parameters have to be inputted. The first is the number of
uncertainty trajectories. They are starting in a distance from
the starting point of the reference trajectory as given by the
second parameter (in grid units).
Additionally, random errors may be added at each time step of the
trajectory calculation. Using a Langevin equation, they are relaxed
with a time constant (in units of the wind field interval, third
parameter) specified by the user. These random errors are
thought to reflect typical wind errors caused, for instance, by
interpolation. The magnitude of these errors (in relative units,
relative to the wind velocity) must be specified by the user for
the three wind components u, v and w (last three parameters).
9. Kind of interpolation
1 - horizontal interpolation bicubic
vertical interpolation polynomial
temporal interpolation linear
>1 - horizontal interpolation bilinear
vertical interpolation linear
temporal interpolation linear
10.cfl criterion horizontal/vertical
factor by which time step must be shorter than that determined
from the CFL criterion, i.e.
delta_t1=delta x/u/cfl
delta_t2=delta y/v/cfl
delta_t3=delta z/w/cfl
delta_t(space) = min(delta_t1,delta_t2,delta_t3)
11. cfl criterion time
factor by wich time is shorter than time interval of the wind
fields
delta_t(time) = delta_T(input wind)/cflt
The time step used for trajectory calculation is the minimum of
delta_t(space) and delta_t(time)
cfl and cflt must not be less than 1!
12. 1 NORMAL mode -> read file STARTPOINTS and calculate a time
series of trajectories starting all from the same starting
points
2 CET mode -> read file STARTCET and calculate trajectories
starting uniformly spaced from a user-defined domain
(for a single starting time)
3 FLIGHT mode -> read file STARTFLIGHT and calculate
trajectories starting neither uniformly spaced nor with
constant time intervals (as needed, for instance, to start
trajectories along an aircraft leg)
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