I read that "in practice, low heat of combustion varies so little from fuel to fuel (roughly 10%) that a basic value of 18,620 kJ/kg has been used as a constant (Van Wagner 1973, Albini 1976)". Is this vale just accounting for the correction of the latent heat expended in evaporating adsorbed water (1263 kJ/kg) or also for the fuel moisture content reduction? (24 kJ/kg per moisture content percentage point)

If I want to calculate a proper value for a longleaf-wiregrass Savannah ecosystem, are this steps/values correct?

1) Longleaf pine litter heat of combustion (L & F)= 8,757 BTU/lbs = 20,369 KJ/Kg

(Hough and Albini, 1978)(Source: Table of Flammability characteristics of Southern species. Southern Fire Exchange Encyclopedia)

2) Longleaf low heat of combustion = 20,369 - 1,263 = 19,106 KJ/Kg

3)Fuel moisture reduction = 10% moisture * 24 = 240.

Longleaf low heat of combustion = 19,106 - 240 = 18,866 KJ/Kg

How can I incorporate the wiregrass component?just following the same steps and averaging both values?

Would you recommend to do these calculations or should I simply use 18,620 kJ/kg as a constant in Byram's formula?

Thanks!]]>

I read that "in practice, low heat of combustion varies so little from fuel to fuel (roughly 10%) that a basic value of 18,620 kJ/kg has been used as a constant (Van Wagner 1973, Albini 1976)". Is this vale just accounting for the correction of the latent heat expended in evaporating adsorbed water (1263 kJ/kg) or also for the fuel moisture content reduction? (24 kJ/kg per moisture content percentage point)

If I want to calculate a proper value for a longleaf-wiregrass Savannah ecosystem, are this steps/values correct?

1) Longleaf pine litter heat of combustion (L & F)= 8,757 BTU/lbs = 20,369 KJ/Kg

(Hough and Albini, 1978)(Source: Table of Flammability characteristics of Southern species. Southern Fire Exchange Encyclopedia)

2) Longleaf low heat of combustion = 20,369 - 1,263 = 19,106 KJ/Kg

3)Fuel moisture reduction = 10% moisture * 24 = 240.

Longleaf low heat of combustion = 19,106 - 240 = 18,866 KJ/Kg

How can I incorporate the wiregrass component?just following the same steps and averaging both values?

Would you recommend to do these calculations or should I simply use 18,620 kJ/kg as a constant in Byram's formula?

Thanks!]]>

My curiosity comes from me and my wife purchasing some land that is completely wooded with trees and a lot of brush. As I clear the land little by little I have the need to burn the piles but I get pretty scared to burn in the winter because I don't want it to get out of hand. Of course I do have water hoses ready and a skid loader running with a bucket full of dirt lol.

This is just my personal observation and I realize I may be wrong. Thanks for any advice in advance.]]>

My curiosity comes from me and my wife purchasing some land that is completely wooded with trees and a lot of brush. As I clear the land little by little I have the need to burn the piles but I get pretty scared to burn in the winter because I don't want it to get out of hand. Of course I do have water hoses ready and a skid loader running with a bucket full of dirt lol.

This is just my personal observation and I realize I may be wrong. Thanks for any advice in advance.]]>

If I follow the equations proposed for Brown to estimate FWM ("Handbook from inventorying DWM, Brown, 1974):

FWD (ton/acre)= (11.64 x n x d^2 x s x a x c)/NL

What are the appropriate values for d^2 and s (specific gravity) by size class for longleaf?

d^2=squared average diameter for each class size and spp.

In many papers, they used values for Western species. Since I am working with longleaf, I want o use the appropriate values for the specie. In the FIA sampling protocol Woodall & Monleon, 2007) there is a table with squared diameters values for longleaf: small:0.020, medium:0.310, large:3.457. Are this the more accurate values to use with longleaf? what value should I use when estimating CWM?

s= specific gravity/density.

I know that the specific bulk density for longleaf is 33.70 (FIA sampling protocol-Woodall & Monleon, 2007), and I also know that specific gravity of longleaf is 0.62 ("Wood handbook, USFS-2010) but how can I estimate the specific gravity per each size class?

Any help, suggestion or recommendation will be greatly appreciate it.

Thanks so much! :)]]>

If I follow the equations proposed for Brown to estimate FWM ("Handbook from inventorying DWM, Brown, 1974):

FWD (ton/acre)= (11.64 x n x d^2 x s x a x c)/NL

What are the appropriate values for d^2 and s (specific gravity) by size class for longleaf?

d^2=squared average diameter for each class size and spp.

In many papers, they used values for Western species. Since I am working with longleaf, I want o use the appropriate values for the specie. In the FIA sampling protocol Woodall & Monleon, 2007) there is a table with squared diameters values for longleaf: small:0.020, medium:0.310, large:3.457. Are this the more accurate values to use with longleaf? what value should I use when estimating CWM?

s= specific gravity/density.

I know that the specific bulk density for longleaf is 33.70 (FIA sampling protocol-Woodall & Monleon, 2007), and I also know that specific gravity of longleaf is 0.62 ("Wood handbook, USFS-2010) but how can I estimate the specific gravity per each size class?

Any help, suggestion or recommendation will be greatly appreciate it.

Thanks so much! :)]]>