Combining forest structure data and fuel modelling to classify fire hazard in Portugal

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Table I

Fuel model parameters for the 19 forest types.

Cover and structural type		Depth,	Fuel load, t ha⁻¹				SVR,	HC,	Mx,	WAF

		cm	1 h	10 h	100 h	live	m⁻¹	kJ kg⁻¹	%
Acacia spp.	CL	43	5.17	1.51	0.00	3.47	5214	20267	32	0.17
Eucalyptus globulus	OT	16	1.10	1.98	1.03	0.49	3645	21032	27	0.14
	OL	51	1.33	0.41	0.00	1.18	5764	20904	30	0.23
	CT	28	5.16	2.84	1.25	2.15	5752	20979	28	0.10
	CL	57	3.73	0.50	0.00	4.02	5579	20897	30	0.13
Quercus pyrenaica	CL	69	1.60	0.59	0.17	2.48	5497	19804	26	0.12
Other deciduous oaks	CL	43	6.37	0.59	0.17	4.89	5039	19604	25	0.14
Diverse	OT	17	2.05	0.41	0.00	0.42	7119	20531	26	0.19
	OL	39	1.73	0.22	0.00	1.17	4720	20491	28	0.36
	CT	39	2.55	1.97	0.28	1.41	4772	20467	28	0.13
	CL	58	1.91	1.03	0.00	3.56	5318	20453	32	0.17
Pinus pinaster	OT	12	5.32	2.97	1.16	0.90	4551	21388	38	0.17
	OL	36	1.86	1.03	0.00	2.36	4303	21444	36	0.44
	CT	24	7.36	2.81	0.88	3.04	4986	21236	37	0.12
	CL	46	6.66	0.89	0.21	6.35	4950	21273	36	0.16
Quercus suber	OT	41	1.38	0.18	0.00	0.56	5994	20412	28	0.16
	OL	50	1.28	2.52	0.00	1.00	5304	20390	32	0.36
	CT	17	3.29	1.90	0.00	1.19	5583	20458	22	0.12
	CL	39	4.75	1.55	0.00	4.39	4666	20381	25	0.15

CL = closed and low stands; CT = closed and tall stands; OL = open and low stands; OT = open and tall stands; 1 h, 10 h and 100 h respect to dead fuel with diameters < 6 mm, 6–25 mm, and > 25 mm, respectively. SVR = surface area to volume ratio; HC = heat content; Mx = dead fuel moisture of extinction; WAF = wind adjustment factor.