ENVS237/637 Practical 7 BUSHFIRE RISK & HOUSE SURVIVAL ASSESSMENT Please answer these questions… 1 answer below »

ENVS237/637 Practical 7

BUSHFIRE RISK & HOUSE SURVIVAL ASSESSMENT

Please answer these questions and submit Answer Sheet through Turnitin

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Table 1:Drought, weather and fire danger characteristics for selected towns in NSW.

Town

Keetch-Byram Drought index (mm equivalents)

Amount of rain (mm)

Days since last rain

Drought factor

Max air temp (oC)

Relative humidity (%)

Peak wind speed (km.h-1)

Forest Fire danger index (FDI)

Lismore

131

3

1

25

39

18

Grafton

142

85

1

25

53

18

Coffs Harbour

153

25

1

22

52

34

Taree

158

55

4

30

29

36

Scone

183

17

1

29

23

36

Nowra

112

16

3

32

9

50

Armidale

149

22

4

23

26

22

Walgett

151

9

12

33

15

26

Dubbo

85

20

7

28

32

18

Parkes

170

30

3

25

32

18

Tibooburra

177

1

20

35

16

10

Cobar

196

1

12

37

17

10

Hay

164

7

1

31

29

10

Table 2. Fire danger index versus Spotting distance for different fuel loads.

Fuel load (t.ha-1)

Spotting distance (km)

Flame height (m)

Rate of Spread
(km.h-1)

1

4

8

12

16

25

Questions – In no more than 100 words (~7 lines of typed text) for each question, please answer on the answer sheet and submit via Turnitin

Question 1 (6 marks). Which town in NSW has the greatest Fire Danger Index, and what is its value? Is the McArthur Forest Fire Danger Meter applicable in all circumstances? Why/why not?

Question 2 (6 marks). What are the minimum and maximum spotting distances and rates of spread of the fire? By what mechanism(s) can fires travel faster?

Question 3 (4 marks). House 1 in Table 3 has the greatest chance of survivability, and holiday house 2 has the least chance. From the table, which factors does house survival seem to be the most sensitive to?

Question 4 (2 marks). Why does a fire burning uphill travel faster than one burning downhill?

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