SU1247020A1 - Method of determining current fire hazard in the forest - Google Patents

Description

The invention relates to forestry, mainly to the protection of forests from fires, and can be used for the operational determination from aircraft of the current fire hazard of forests.

The aim of the invention is to improve the accuracy of determining the current fire hazard of the forest.

In the method of determining from the aircraft the current fire danger of the forest, which consists in receiving and registering the radiation of the forest area along the flight path of the aircraft, after registration by means of smoothing, they transform the implementation sites corresponding to the forest territory with an abnormally low radio temperature and then the current fire danger is determined by the mean value of the radio frequency temperature and its standard deviation.

Assessment of fire maturity of forest areas is

in the following. I

Plots corresponding to

open water surfaces based on the following features:

The section of radio frequency realization T T, (l), corresponding to the water surface, has at least one local minimum T „„ „, which lies below the threshold value T

.i t

-

M (T J. - AT;

(

(one) . (2)

M (T) - - | .T (l) dl, (3)

about

where DT is the critical temperature difference;

M (T) is the average value of the radio frequency temperature along the flight path of length L; I is the current distance along the flight path of the aircraft;

The plot of sales corresponding to the water surface in the local minimum area has the value of the first derivative, exceeding in absolute value some critical value

, / dT / dl / T ,,, (4)

VNNPI

Order 4043/6 Edition 431

Random polygons pr-tie, Uzhgorod, st. Project, 4

where T is the critical value of the temperature derivative along the path, which depends on the flight parameters of the aircraft and the inertia of the receiving measurement path.

The highlighted plots are replaced by segments of smooth lines connecting the boundaries of the plots.

Based on the processing of the converted register patterns, the following diagnostic features are formed to determine fire maturity: the mean value of the radio temperature over the flight path of the aircraft

C —H (grad.K); (five)

about

dispersion of radio frequency temperature along the flight paths of the aircraft

 If

 L j

6

(T (D-T f dZ (grad.k)).

(6)

The criterion of fire danger of the forest along the flight route; LA is defined by the expression

Р + & б + с, (7)

where P is a dimensionless criterion.

the current fire dangerous-,

ti;

a is a coefficient showing the effect on the current fire hazard criterion,

1 / hail

The use of the proposed method for determining the current fire hazard in forest areas provides for an increase in the reliability and efficiency of fire hazard forecasting at large and remote from the weather station areas, more reasonable designation of the modes of operation of the forest air guard service from fires, which, in turn, reduces the average fire area for an account of timely detection and reduction of costs for patrolling forest areas.

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Claims (1)

METHOD FOR DETERMINING THE CURRENT FIRE HAZARD OF THE FOREST, including the reception and registration of the thermal radiation of the forest area along the flight path of the aircraft and the analysis of the obtained results of the thermal radiation, characterized in that, in order to improve the accuracy of determining the current fire hazard of the forest, the analysis of the recorded parameters of the thermal radiation is carried out by smoothing sections corresponding to forest territory with an abnormally low radio brightness temperature, and the current fire hazard determined by the average value of the brightness temperature and its standard deviation.