Interface CRC Research on the Interface Zone … · 1 © BUSHFIRE CRC LTD 2006 Interface CRC Research on the Interface Zone Bob Leicester CSIRO Interface © BUSHFIRE CRC LTD 2006

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© BUSHFIRE CRC LTD 2006

Interface

CRC Research on the Interface Zone

Bob LeicesterCSIRO

© BUSHFIRE CRC LTD 2006Interface

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A Risk Model for Attack within the Interface Zone

Project D1


OBJECTIVE

Develop a model to predict the probability that a particular house will be destroyed by wildfire within the next 50 years

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Aerometrex

Eyre Peninsula Survey


Target house

house

house

shed

tree

Wildland vegetation

wind

fence

Interface

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Modes of destruction (groups)

• direct radiation

• ember entry

• ember burn-through


Radiation

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ά

Wind Vw

0.3 Vw

Canopy top

FLAME

To

Understoreyfuel

z


Target house

house

house

shed

tree

Wildland vegetation

wind

fence

Interface

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DATA

© BUSHFIRE CRC LTD 2006InterfaceGLAZING

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FAILURE OF GLAZING SYSTEMS

qcrit = 10 – 50 kw/m2

Depends on:

• glass used

• frame material

• sealant


DECKING

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Fence tests, Mogo


WATER TANKS

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House to house fire spread

Radiation emitted from house

0

10

20

30

40

50

60

70

80

0 500 1000 1500 2000 2500 3000 3500

Time (sec)

Rad

iatio

n (k

W/m

2 )

2 metre eaves2 metre window4 metre eaves4 metre window6 metre eaves6 metre window

Window failure

Peak flaming from window at eaves


Ember Entry

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EMBER ENTRYHazard parameters• embers• people• zone of house• gap-factors

G = gap factor

= Σ Ag(wg – 2)0.5Ag = gap area

wg = gap width


Ember Burn-through

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EMBER BURN THROUGH

Hazard parameters• embers• radiation• people• construction

Examples: reentrant corners, ledges of windows and doors

Construction factor = fn{ geometry, material }


REFERENCE HOUSE

(50m from wildland edge, hot fire)

Probability of destruction

• from radiation = 0.05

• from ember burn through = 0.10

• from ember entry = 0.30

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0.80Fire brigade only

0.90Occupant or neighbouronly

0.30No one

Proportion of reference houses saved

Present

Probability that someone will defend house = 0.60


building safety

Rural/urban fuel management

Community education

Building codes

Town planning

AS:3959

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CRC RESEARCH

• Preparation

• Prevention

• Response

• Recovery


PREPARATION

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A1.3 Fuel Classification

A2.1 Fire Weather

Fuel reduction


Characteristic Patterns

[Photos courtesy of Doug Ford]

B3.1, B3.2 Biodiversity

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© BUSHFIRE CRC LTD 2006InterfaceB2.1 smoke movement

B2.1 Smoke composition


D2.2 Smoke toxicity

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D1 Building construction

C1.1, C7.1 Community education

D3 Volunteerism


PREVENTION

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C3.1 Arson


RESPONSE

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A3.1 Suppression techniques

A1.1 monitoring progress


Mogo

D2.4 Equipment

D4 Respiratory health

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Heart Rate

Trunk movt.

BreathRate

SkinTemp

LifeShirt®

D2.1 Physiological factors


D2.3 Safe decisionsD5 IMT communications

C4.1 Risk communication

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RECOVERY


Data CollectionAssist Coronial Enquiries

Fire scenarioCommunity response

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Building response


THANK YOU

Documents

Interface CRC Research on the Interface Zone … · 1 © BUSHFIRE CRC LTD 2006 Interface CRC Research on the Interface Zone Bob Leicester CSIRO Interface © BUSHFIRE CRC LTD 2006