Forest grassland fire deduction method and device

Abstract

The invention relates to a forest steppe fire deduction method and device, a map is divided into a plurality of cells, each cell corresponds to a combustion state, and the map fire is visually displayed according to the combustion states of the cells. Meanwhile, the spreading speed and direction of the fire behavior of the cells are calculated on the basis of meteorological parameters, the configuration pattern of the ground surface combustible materials and the terrain slope adjustment coefficient, the neighborhood cells are adjusted according to the combustion state of the cells, and finally the map fire behavior is predicted in real time. The forest grassland fire deduction method can accurately deduce the forest grassland fire, is high in data calculation real-time performance, and can provide effective fire prevention and control support for related workers.

Description

Technical Field

[0001] The present invention relates to the technical field related to intelligent forestry prevention and control, and in particular to a method and device for simulating forest and grassland fire conditions. Background Art

[0002] Forest and grassland fire simulation is a method to simulate the occurrence, development and control process of forest and grassland fires. It provides a scientific basis for fire prevention and emergency response by analyzing the possibility of fire, the speed and direction of fire spread, and the effects of different control measures.

[0003] The current problems with forest fire situation simulation include low data update frequency, inability to reflect real-time changes in the fire situation, and affecting the accuracy of the simulation. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the deficiencies of the prior art and to provide a method and device for simulating forest and grassland fire conditions.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] Specifically, a forest and grassland fire situation simulation method is proposed, including the following:

[0007] Step 110, dividing the map into a plurality of cells, each cell corresponding to a combustion state, the combustion state is quantified by a value between 0 and 1, where 0 represents unburned and 1 represents fully burned, and then going to step 120;

[0008] Step 120, predetermine the ignition point, set its state to start burning, start burning means that the burning state of the cell is between 0 and 1, and go to step 130;

[0009] Step 130, based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient, calculate the spread speed and direction of the fire, and go to step 140;

[0010] Step 140: Update the state of the neighboring cells based on the spreading speed and direction of the fire, and go to step 150;

[0011] Step 150, when any cell reaches a complete combustion state, the cells in its neighboring cells whose combustion state is 0 are marked as starting to burn, and then go to step 160;

[0012] Step 160, repeating steps 130 to 150 until the preset total duration is reached or the fire spread meets the stop condition, then go to step 170;

[0013] Step 170: Summarize and output the simulation conditions of all cells, and visualize the fire conditions on the map.

[0014] Further, specifically, meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient,

[0015] include,

[0016] Meteorological parameters include temperature, wind speed, and humidity.

[0017] The temperature is divided into 6 levels: <5℃, 5℃~10℃, 10.1℃~15℃, 15.1℃~20℃, 20.1℃~25℃, >25℃, corresponding to different first index coefficients; the wind speed is divided into 8 levels: 0~1.5m / s,

[0018] 1.6m / s~3.3m / s, 3.4m / s~5.4m / s, 5.5m / s~7.9m / s, 8.0m / s~10.7m / s, 10.8m / s~13.8m / s, 13.9m / s~17.1m / s, >17.1m / s, respectively corresponding to different second index coefficients; humidity is divided into 6 levels:

[0019] ≥71%RH, 61%RH~70%RH, 51%RH~60%RH, 41%RH~50%RH,

[0020] 31%RH~40%RH, ≤30%RH, corresponding to different third index coefficients;

[0021] The configuration pattern of surface combustibles and the terrain slope adjustment coefficient are:

[0022] Different surface combustibles, including dead branches and leaves, flat pine needles, thatch weeds, sedge and dwarf birch, pasture grassland, red pine and Chinese pine, and sand, correspond to different fourth index coefficients.

[0023] Further, specifically, the fire spread speed and direction are calculated, including,

[0024] The cells adjacent to the fire point cell are up, down, left, right, upper left, upper right, lower left, and lower right, a total of 8 burning directions. The spread speed is calculated for each burning direction. The burning spread speed in a vector direction is calculated by the formula R=Rq*Ks*Kw*Kp, where Rq is the meteorological parameter calculation index, Rq=aT+bV+cH-D, T is the daily maximum temperature, V is the daily average wind speed, H is the daily minimum humidity, a, b, c, and D are constants, Ks is the correction coefficient of the surface combustible configuration pattern, and the combustible types are divided into: flat pine needles=0.8, dead branches and fallen leaves=1.2, thatch and weeds

[0025] =1.6, sedge birch =1.8, pasture grassland =2.0, red pine and Chinese pine =1.0, Kw is the wind speed adjustment coefficient, divided into 8 levels: 0~1.5m / s=1.2, 1.6m / s~3.3m / s=1.7, 3.4m / s~5.4m / s=2.4,

[0026] 5.5m / s~7.9m / s=4.1, 8.0m / s~10.7m / s=6.0, 10.8m / s~13.8m / s=8.5,

[0027] 13.9m / s~17.1m / s=11.2、>17.1m / s=14.7,Kp is the terrain slope adjustment coefficient, calculated by Kp=e^3.533(tanΦ)^1.2, Φ is the slope.

[0028] Furthermore, the method further comprises:

[0029] If the boundary of the spreading area intersects with an obstacle at a certain moment, the boundary of the spreading area is divided according to the boundary of the obstacle.

[0030] Furthermore, specifically, the fire spread meeting the stopping conditions means that there are water systems, fire-prevention forest belts, roads and other non-combustible surface cover types in the direction of combustion, which can block the spread of fire.

[0031] Further, specifically, visualizing the fire situation on the map includes:

[0032] The area and range of all completely burned cells are displayed on the map as the fire situation spread area range.

[0033] The present invention also provides a device for forest and grassland fire situation deduction, comprising the following:

[0034] A map partitioning module, for dividing the map into a plurality of cells, each cell corresponding to a combustion state, wherein the combustion state is quantified by a value between 0 and 1, wherein 0 represents unburned and 1 represents fully burned;

[0035] An initialization module, used to predetermine the ignition point and set its state to start burning;

[0036] The fire calculation module is used to calculate the spread speed and direction of the fire based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient;

[0037] The cell status update module is used to update the status of neighboring cells based on the spread speed and direction of the fire;

[0038] The combustion state update module is used to mark the cells with a combustion state of 0 in its neighboring cells as starting to burn when any cell reaches the fully burned state;

[0039] A loop module, used for repeatedly executing the fire intensity calculation module, the cell state update module and the combustion state update module until a preset total time is reached or the fire spread meets the stop condition;

[0040] The visualization display module is used to summarize and output the simulation conditions of all cells and to perform a visualization display of the fire situation on the map.

[0041] The beneficial effects of the present invention are:

[0042] The present invention proposes a method and device for simulating forest and grassland fire conditions, which divides a map into multiple cells, each cell corresponds to a burning state, and uses the burning state of the cell to visualize the fire conditions on the map. At the same time, based on meteorological parameters, the configuration pattern of surface combustibles, and the terrain slope adjustment coefficient, the spread speed and direction of the fire in the cell are calculated, and the neighboring cells are adjusted according to the burning state of the cell, and finally the map fire conditions are predicted in real time. The present invention can accurately deduce forest and grassland fire conditions, and the data calculation is highly real-time, which can provide effective fire prevention and control support for relevant personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and other features of the present disclosure will become more apparent by describing in detail the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings of the present disclosure represent the same or similar elements. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure. For those skilled in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0044] Figure 1 Shown is a flow chart of a forest and grassland fire situation deduction method of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0046] Example 1, reference Figure 1 The present invention proposes a forest and grassland fire situation deduction method, comprising the following steps:

[0047] Step 110, dividing the map into a plurality of cells, each cell corresponding to a combustion state, the combustion state is quantified by a value between 0 and 1, where 0 represents unburned and 1 represents fully burned, and then going to step 120;

[0048] Step 120, predetermine the ignition point, set its state to start burning, and go to step 130;

[0049] Step 130, based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient, calculate the spread speed and direction of the fire, and go to step 140; the specific calculation process is as follows:

[0050] The cells adjacent to the fire point cell are up, down, left, right, upper left, upper right, lower left, and lower right, a total of 8 burning directions, and the spread speed is calculated for each burning direction. The burning spread speed in a vector direction is given by the formula R=Rq*Ks*Kw*Kp, where Rq is the meteorological parameter calculation index, Rq=aT+bV+cH-D, T is the daily maximum temperature, V is the daily average wind speed, H is the daily minimum humidity, and a, b, c, and D are constants (a=0.03, b=0.05, c=0.01, D=0.3). Ks is the correction coefficient for the surface combustible configuration pattern, and the combustible types are divided into: flat pine needles=0.8, dead branches and leaves=1.2, thatch and weeds=1.6, sedge dwarf birch=1.8, pasture grassland=2.0, red pine and Chinese pine=1.0. Kw is the wind speed adjustment coefficient, which is divided into 8 levels: 0~1.5m / s=1.2,

[0051] 1.6m / s~3.3m / s=1.7, 3.4m / s~5.4m / s=2.4, 5.5m / s~7.9m / s=4.1, 8.0m / s~10.7m / s=6.0,

[0052] 10.8m / s~13.8m / s=8.5、13.9m / s~17.1m / s=11.2、>17.1m / s=14.7。Kp is the terrain slope adjustment coefficient, which is Kp=e^3.533(tanΦ)^1.2, Φ is the slope.

[0053] Step 140: Update the state of the neighboring cells based on the spread speed and direction of the fire, and go to step 150; the specific update process is as follows:

[0054] That is, after calculating the spreading speed of the burning cell toward the 8 adjacent cells, the time T is calculated from the spreading speed R* to obtain the distance that the burning can spread within the time. If the spacing between the burning cells is greater than the burning spreading distance, the adjacent cells in this direction are not burning; if the spacing between the burning cells is less than the burning spreading distance, and the total spacing between the burning cells and the adjacent cells is greater than the burning spreading distance, the adjacent cells in this direction are in a burning state; if the total spacing between the burning cells and the adjacent cells is less than the burning spreading distance, the adjacent cells in this direction are in a completely burning state;

[0055] Step 150, when any cell reaches a complete combustion state, the cells in its neighboring cells whose combustion state is 0 are marked as starting to burn, and then go to step 160;

[0056] Step 160, repeating steps 130 to 150 until the preset total duration is reached or the fire spread meets the stop condition, then go to step 170;

[0057] Step 170: Summarize and output the simulation conditions of all cells, and visualize the fire conditions on the map.

[0058] In this embodiment 1, the map is divided into multiple cells, each cell corresponds to a burning state, and the burning state of the cell is used to visualize the fire situation on the map. At the same time, based on meteorological parameters, the configuration pattern of surface combustibles, and the terrain slope adjustment coefficient, the spread speed and direction of the fire in the cell are calculated, and the neighboring cells are adjusted according to the burning state of the cell, and finally the map fire situation is predicted in real time. The present invention can accurately deduce forest and grassland fire conditions, and the data calculation is highly real-time, which can provide effective fire prevention and control support for relevant personnel.

[0059] As a preferred embodiment of the present invention, specifically, the meteorological parameters and the configuration pattern of surface combustibles and the terrain slope adjustment coefficient include:

[0060] Meteorological parameters include temperature, wind speed, and humidity.

[0061] Among them, the temperature is divided into 6 levels: <5℃, 5℃~10℃, 10.1℃~15℃, 15.1℃~20℃, 20.1℃~25℃, >25℃, corresponding to different first index coefficients; the wind speed is divided into 8 levels: 0~1.5m / s, 1.6m / s~3.3m / s, 3.4m / s~5.4m / s, 5.5m / s~7.9m / s, 8.0m / s~10.7m / s, 10.8m / s~13.8m / s, 13.9m / s~17.1m / s, >17.1m / s, corresponding to different second index coefficients respectively; the humidity is divided into 6 levels: ≥71%RH, 61%RH~70%RH, 51%RH~60%RH, 41%RH~50%RH,

[0062] 31%RH~40%RH, ≤30%RH, corresponding to different third index coefficients;

[0063] The configuration pattern of surface combustibles and the terrain slope adjustment coefficient are:

[0064] Different surface combustibles, including dead branches and leaves, flat pine needles, thatch weeds, sedge and dwarf birch, pasture grassland, red pine and Chinese pine, and sand, correspond to different fourth index coefficients.

[0065] As a preferred embodiment of the present invention, specifically, calculating the spread speed and direction of the fire includes:

[0066] The cells adjacent to the fire point cell are up, down, left, right, upper left, upper right, lower left, and lower right, a total of 8 burning directions. The spread speed is calculated for each burning direction. The burning spread speed in a vector direction is calculated by the formula R=Rq*Ks*Kw*Kp, where Rq is the meteorological parameter calculation index, Rq=aT+bV+cH-D, T is the daily maximum temperature, V is the daily average wind speed, H is the daily minimum humidity, a, b, c, and D are constants, Ks is the correction coefficient of the surface combustible configuration pattern, and the combustible types are divided into: flat pine needles=0.8, dead branches and fallen leaves=1.2, thatch and weeds

[0067] =1.6, sedge birch =1.8, pasture grassland =2.0, red pine and Chinese pine =1.0, Kw is the wind speed adjustment coefficient, divided into 8 levels: 0~1.5m / s=1.2, 1.6m / s~3.3m / s=1.7, 3.4m / s~5.4m / s=2.4,

[0068] 5.5m / s~7.9m / s=4.1, 8.0m / s~10.7m / s=6.0, 10.8m / s~13.8m / s=8.5,

[0069] 13.9m / s~17.1m / s=11.2、>17.1m / s=14.7,Kp is the terrain slope adjustment coefficient, calculated by Kp=e^3.533(tanΦ)^1.2, Φ is the slope.

[0070] As a preferred embodiment of the present invention, the method further comprises:

[0071] If the boundary of the spreading area intersects with an obstacle at a certain moment, the boundary of the spreading area is divided according to the boundary of the obstacle.

[0072] As a preferred embodiment of the present invention, specifically, the fire spread meeting the stopping condition means that there are water systems, fire prevention belts, roads and other non-combustible surface cover types in the direction of combustion, which can block the spread of fire.

[0073] As a preferred embodiment of the present invention, specifically, visual display of fire conditions on the map includes:

[0074] The area and range of all completely burned cells are displayed on the map as the fire situation spread area range.

[0075] The present invention also provides a device for forest and grassland fire situation deduction, comprising the following:

[0076] A map partitioning module, for dividing the map into a plurality of cells, each cell corresponding to a combustion state, wherein the combustion state is quantified by a value between 0 and 1, wherein 0 represents unburned and 1 represents fully burned;

[0077] An initialization module, used to predetermine the ignition point and set its state to start burning;

[0078] The fire calculation module is used to calculate the spread speed and direction of the fire based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient;

[0079] The cell status update module is used to update the status of neighboring cells based on the spread speed and direction of the fire;

[0080] The combustion state update module is used to mark the cells with a combustion state of 0 in its neighboring cells as starting to burn when any cell reaches the fully burned state;

[0081] A loop module, used for repeatedly executing the fire intensity calculation module, the cell state update module and the combustion state update module until a preset total time is reached or the fire spread meets the stop condition;

[0082] The visualization display module is used to summarize and output the simulation conditions of all cells and to perform a visualization display of the fire situation on the map.

[0083] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0084] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or system that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0085] Although the description of the present invention has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims in view of the prior art by reference to the appended claims, thereby effectively covering the intended scope of the present invention. In addition, the above description of the present invention is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present invention that have not yet been foreseen may still represent equivalent changes to the present invention.

[0086] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation. As long as the technical effect of the present invention is achieved by the same means, it should belong to the protection scope of the present invention. Within the protection scope of the present invention, its technical scheme and / or implementation method can have various modifications and changes.

Claims

1. A method for simulating forest and grassland fire conditions, characterized in that: Includes the following: Step 110, dividing the map into a plurality of cells, each cell corresponding to a combustion state, the combustion state is quantified by a value between 0 and 1, where 0 represents unburned and 1 represents fully burned, and then going to step 120; Step 120, predetermine the ignition point, set its state to start burning, start burning means that the combustion state of the cell is between 0 and 1, and the combustibles therein are burning, and go to step 130; Step 130, based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient, calculate the spread speed and direction of the fire, and go to step 140; Step 140: Update the state of the neighboring cells based on the spreading speed and direction of the fire, and go to step 150; Step 150, when any cell reaches a complete combustion state, the cells in its neighboring cells whose combustion state is 0 are marked as starting to burn, and then go to step 160; Step 160, repeating steps 130 to 150 until the preset total duration is reached or the fire spread meets the stop condition, then go to step 170; Step 170: Summarize and output the simulation conditions of all cells, and visualize the fire conditions on the map.

2. A forest and grassland fire situation deduction method according to claim 1, characterized in that: Specifically, meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient, including: Meteorological parameters include temperature, wind speed, and humidity. Among them, the temperature is divided into 6 levels: <5℃, 5℃~10℃, 10.1℃~15℃, 15.1℃~20℃, 20.1℃~25℃, >25℃, corresponding to different first index coefficients; the wind speed is divided into 8 levels: 0~1.5m / s, 1.6m / s~3.3m / s, 3.4m / s~5.4m / s, 5.5m / s~7.9m / s, 8.0m / s~10.7m / s, 10.8m / s~13.8m / s, 13.9m / s~17.1m / s, >17.1m / s, corresponding to different second index coefficients respectively; the humidity is divided into 6 levels: ≥71%RH, 61%RH~70%RH, 51%RH~60%RH, 41%RH~50%RH, 31%RH~40%RH, ≤30%RH, corresponding to different third index coefficients respectively; The configuration pattern of surface combustibles and the terrain slope adjustment coefficient are: Different surface combustibles, including dead branches and leaves, flat pine needles, thatch weeds, sedge and dwarf birch, pasture grassland, red pine and Chinese pine, and sand, correspond to different fourth index coefficients.

3. A forest and grassland fire situation deduction method according to claim 2, characterized in that: Specifically, calculate the speed and direction of fire spread, including: The cells adjacent to the fire point cell are up, down, left, right, upper left, upper right, lower left, and lower right, a total of 8 burning directions. The spread speed is calculated for each burning direction. The burning spread speed in a vector direction is calculated by the formula R=Rq*Ks*Kw*Kp, where Rq is the meteorological parameter calculation index, Rq=aT+bV+cH-D, T is the maximum temperature of the day, V is the average wind speed of the day, H is the minimum humidity of the day, a, b, c, and D are constants, Ks is the correction coefficient of the surface combustible configuration pattern, and the combustible types are divided into: flat pine needles=0.8, dead branches and fallen leaves=1.2, thatch weeds=1.6, sedge dwarf birch=1.8, pasture grassland =2.0, Pinus armandii =1.0, Kw is the wind speed adjustment coefficient, which is divided into 8 levels: 0~1.5m / s=1.2, 1.6m / s~3.3m / s=1.7, 3.4m / s~5.4m / s=2.4, 5.5m / s~7.9m / s=4.1, 8.0m / s~10.7m / s=6.0, 10.8m / s~13.8m / s=8.5, 13.9m / s~17.1m / s=11.2, >17.1m / s=14.7, Kp is the terrain slope adjustment coefficient, calculated by Kp=e^3.533(tanΦ)^1.2, Φ is the slope.

4. A forest and grassland fire situation deduction method according to claim 1, characterized in that: The method further comprises, If the boundary of the spreading area intersects with an obstacle at a certain moment, the boundary of the spreading area is divided according to the boundary of the obstacle.

5. The method for simulating forest and grassland fire conditions according to claim 1, characterized in that: Specifically, the fire spread meeting the stopping conditions means that there are water systems, fire-prevention forest belts, roads and other non-combustible surface cover types in the direction of combustion, which can block the spread of fire.

6. A forest and grassland fire situation deduction method according to claim 1, characterized in that: Specifically, the fire situation is visualized on the map, including: The area and range of all completely burned cells are displayed on the map as the fire situation spread area range.

7. A device for forest and grassland fire situation deduction, characterized in that: Includes the following: A map partitioning module, for dividing the map into a plurality of cells, each cell corresponding to a combustion state, wherein the combustion state is quantified by a value between 0 and 1, wherein 0 represents unburned and 1 represents fully burned; An initialization module, used to predetermine the ignition point and set its state to start burning; The fire calculation module is used to calculate the spread speed and direction of the fire based on meteorological parameters, the configuration pattern of surface combustibles and the terrain slope adjustment coefficient; The cell status update module is used to update the status of neighboring cells based on the spread speed and direction of the fire; The combustion state update module is used to mark the cells with a combustion state of 0 in its neighboring cells as starting to burn when any cell reaches the fully burned state; A loop module, used for repeatedly executing the fire intensity calculation module, the cell state update module and the combustion state update module until a preset total time is reached or the fire spread meets the stop condition; The visualization display module is used to summarize and output the simulation conditions of all cells and to perform a visualization display of the fire situation on the map.

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