found a bug with area burned calculation

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Marc Parisien
found a bug with area burned calculation

 

A bug with the area burned calculation has been reported to me by Sandy Erni, from l'Institut national de recherche scientifique. 

PARAMETERS:

*M-1 fuel

*whatever weather

*point ignition

*vary percent conifer by 10% increments

*elapsed time=60 minutes

PROBLEM:

*The area burned at the ercent conifer=60 value is *less* that it is for the 50% value (see table below).

*This bug has been observed in both REDapp and the CFFDRS calculator.

*This bug does not appear when the elapsed time is longer, or when the it is from a line ignition

*This bug does not affect the ROS values, just the area burned calculation.

*I did not been compared to the R package 'fwi.fbp' (soon to be replaced by 'cffdrs').

 

Ellipse ha

60 mn

360 mn

REDAPP

% conifères

 

 

D-1

0

0,41

19,16

M-1

10

0,8

37,4

M-1

20

1,39

65,11

M-1

30

2,14

100,47

M-1

40

3,06

143,46

M-1

50

3,43

188,69

M-1

60

2,45

223,99

M-1

70

5,13

304,93

M-1

80

7,29

383,81

M-1

90

9,29

467,11

M-1

100

11,31

556,91

C-2

 

10,07

487,39