M a n a g e m e n ta n dA n a l y s i so fS n o w,A v a l a n c h ea n dC l i m a t eD a t a

The result is an integer value between 0 and 1250 for each
gridcell;itrepresents realisticsentences ofthebulletin
such as: "considerable hazardabove about 2200 m on steep
slopes facing NW to E". - In the following the weight fac-
torsaredescribed;atpresenttheydependfromexpert
knoweledge only.

HAZARD LEVELP
HL
InthismodelP_HLranges from2to10."Lowhazard" is
equal to 2,"moderate hazard" = 4,"considerable hazard"
=6,"high hazard" = 8and "veryhigh hazard" = 10.As
mentioned P
HL^{is purely numeric since no regional differ-}
entiation is made yet.

Altitude P _ALT

The Altitude is weighed as follows:

Altitude >= 2200m--> P_ALT

2200 <= Alt.>= 1800m --> P_ALT

2000 <= Alt.>= 1800m --> P_ALT

Altitude <= 1800 m--> P
ALT

= 5

= 3

= 2

= 1

Theadjective"about"causesthedifferentiationbetween1800
m and2200, a ribbon whichcannotbe setto thelowest level.
Similarconverting rules exist forterms as "below about",
"in altitudes from...to..." or "in all altitudes".

Slope P

_{S L P}

The weight factor for the slope angle is defined as fol-
lows:

slope angle >=30º --> P =5 between 28º and 30º --> P = 4 between 25º and 28º --> P = 3 between 15º and 28º --> P = 2 slope angle<= 15º --> PP =1

Similarconvertingrulesas forthealtitudeexistfor
expressions like "extreme steep" or "moderate steep".

3

Fig. 2: Calculation of weight-factor for ALTITUDE

Fig. 3: Calculation of weight-factor for SLOPE