METHOD FOR SPATIAL QUANTITATIVE EVALUATION OF AMBIENT AIR CONTAMINATION LEVEL Russian patent published in 2013 - IPC G01W1/00 

FIELD: ecology.

SUBSTANCE: territory that is required to be investigated for the state of ambient air contamination level is chosen. Field measurements of concentrations of ambient air contaminants are carried out on the investigated territory at points of field measurements. An investigated territory map is completed with a regular network; node points are defined on it and location of the points, at which field measurements were carried our, is marked. All ambient air contamination sources are found out on the investigated territory and acquisition of data on parameters of emissions from the above ambient air contamination sources is performed. Then, a calculation of ground level concentrations of contaminants at points of field measurements and at node points of the specified regular network from the above ambient air contamination sources is performed using standard mathematical modes and software. For each point, where there is the data both of the scattering calculation and field measurements, a coefficient of compliance is determined as ratio of measured concentration to the calculated one. Then, points of field measurements of contaminant concentrations are combined on the map with crossing sections into triangles, thus forming a system of triangles with vertexes at points of field measurements. For each triangle an equation of a plane is solved with determination of equation coefficients depending on coordinates of triangle vertexes - points of field measurements, and values of compliance coefficients at them. Then, each node point of the calculated network is referred to any triangle or it is defined that it lies out of the above system of triangles. For each node point lying inside the system of triangles a compliance coefficient is calculated as per the equation of plant of the corresponding triangle. And for node points lying out of the system of triangles, the compliance coefficient is calculated using an extrapolation method. For that purpose values of the compliance coefficient at the node point are accepted equal to compliance coefficients at the nearest point lying on the external boundary of the system of triangles. Earlier calculated ground concentrations of contaminants at node points of the specified regular network are multiplied by the obtained compliance coefficients so that the specified concentration of contaminants at node points of the network is obtained. Then, a map of spatial distribution of specified concentrations of contaminants is built, as per which quantitative evaluation of ambient air contamination level on the investigated territory is performed.

EFFECT: improving accuracy of spatial quantitative evaluation of ambient air contamination level.

5 tbl, 9 dwg