CN112462028B - Method for estimating water content of 10-h dead combustible on forest ground surface - Google Patents
Method for estimating water content of 10-h dead combustible on forest ground surface Download PDFInfo
- Publication number
- CN112462028B CN112462028B CN202011477253.XA CN202011477253A CN112462028B CN 112462028 B CN112462028 B CN 112462028B CN 202011477253 A CN202011477253 A CN 202011477253A CN 112462028 B CN112462028 B CN 112462028B
- Authority
- CN
- China
- Prior art keywords
- water content
- air
- dead combustible
- dead
- estimating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/222—Solid fuels, e.g. coal
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
Abstract
The invention discloses a method for estimating the water content of 10-h dead combustible on the surface of a forest land, relates to the technical field of meteorological data processing, and particularly relates to a method for estimating the water content of 10-h dead combustible on the surface of the forest land. The invention only needs to measure the air temperature and the relative humidity of the air at the place where the dead combustible material is located, and then substitutes the air temperature into the formula
Obtaining the saturated vapor pressure of air, substituting the air humidity and the saturated vapor pressure of air into the formula VPD-VP-RH to obtain the saturated vapor pressure difference of air, and finally substituting the saturated vapor pressure difference of air and the relative humidity of air into the formula DFMC-a-e‑b*VPDAnd + c RH-d, obtaining the water content of the dead combustible material of 10-h. The method is simple to operate, can quickly estimate the water content of the 10-h dead combustible, can improve the accuracy of estimating the water content of the 10-h dead combustible, and has very important significance for controlling forest fire risks.
Description
Technical Field
The invention relates to the technical field of meteorological data processing, in particular to a method for 10-h of water content of dead combustible on the surface of a forest land.
Background
Forest fires are critical to the water and carbon circulation of the earth, but carbon dioxide and other particles emitted by the forest fires affect climate change, cause air quality to be reduced and threaten human health. Meanwhile, in the presence of forest fire, the safety of building facilities and human life and property is extremely fragile. Therefore, the method has important significance in monitoring and predicting forest fire risks.
The moisture content of the surface dead combustible is a very important determinant factor of forest fire danger. The formula is the water content of the dead combustible divided by the weight of dry matter. According to the time lag theory, dead combustibles can be divided into four types of 1-h, 10-h, 100-h and 1000-h. And 10-h dead combustibles are important factors for causing a fire and helping the fire spread. The traditional estimation of the water content of the dead combustible material within 10-h comprises the following steps: firstly, measuring air temperature T and air relative humidity RH corresponding to the position of the forest surface dead combustible, and then substituting the following formula to calculate the balance moisture content EMC:
and then utilizing the relation between the water content of the dead combustible material DFMC and EMC within 10-h: DFMC 1.28 × EMC, 10-h water content of dead combustible was obtained. The method estimates the water content of the dead combustible only through a simple relation between the water content of the dead combustible and the temperature and humidity, does not consider the influence of the introduced saturated steam pressure difference on the 10-h dead combustible, and does not consider the exponential relation between the saturated steam pressure difference and the water content of the 10-h dead combustible.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for estimating the water content of the dead combustible 10-h on the forest ground surface with high precision.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for estimating the water content of dead combustible 10-h on the forest surface comprises the following steps:
step 1: collecting air temperature T and air relative humidity RH corresponding to the positions of the dead combustible materials on the forest surface;
step 2: calculating the saturated water vapor pressure VP of the air by adopting the following formula;
and step 3: calculating the air saturation vapor pressure difference VPD by adopting the following formula;
VPD＝VP-VP*RH
and 4, step 4: calculating the water content DFMC of the dead combustible material within 10-h by adopting the following formula;
DFMC＝a*e-b*VPD+c*RH-d
wherein the value of a is 28.25786-30.61963, the value of b is 1.04652-2.07710, the value of c is 0.05520-0.75358, and the value of d is 5.99783-7.14584.
Further, the value of a is 29.28935.
Further, the b value is 1.19739.
Further, the value of c is 0.13484.
Further, the value of d is 6.69382.
The invention has the beneficial effects that: compared with the traditional method for measuring the water content of the dead combustible material within 10-h, which only simply utilizes the air temperature and the air relative humidity, the method for estimating the water content of the dead combustible material within 10-h combines the air saturated water vapor pressure difference and the air relative humidity to estimate the water content of the dead combustible material within 10-h. Firstly, measuring the air temperature and the air relative humidity of the dead combustible material, and then substituting the air temperature into a formula
Obtaining the saturated vapor pressure of air, substituting the air humidity and the saturated vapor pressure of air into the formula VPD-VP-RH to obtain the saturated vapor pressure difference of air, and finally substituting the saturated vapor pressure difference of air and the relative humidity of air into the formula DFMC-a-e-b*VPDAnd + c RH-d, obtaining the water content of the dead combustible material of 10-h. The method is simple to operate, can quickly estimate the water content of the dead combustible materials within 10-h, can improve the precision of measuring the water content of the dead combustible materials, and has very important significance for controlling forest fire risks.
Drawings
FIG. 1 is a schematic flow diagram of the overall process of the present invention.
FIG. 2 is a comparison of the effects of the present invention in the embodiment with the conventional method.
Detailed Description
At present, in order to measure the water content of the dead combustible materials on the forest surface for 10-h, the traditional method only simply utilizes the air temperature and the air relative humidity. Researches show that the air saturated steam pressure difference and the water content of the dead combustible have a very obvious exponential relationship, and the traditional measurement method does not utilize the relationship between the saturated steam pressure difference and the water content of the dead combustible and has low precision. In order to solve the above problems, the present invention providesProvides a method for efficiently estimating the water content of the dead combustible 10-h on the forest surface. Specifically, the method for estimating the water content of the dead combustible 10-h on the forest surface comprises the following steps: firstly, measuring air temperature T and air relative humidity RH corresponding to the position of the forest surface dead combustible, substituting the air temperature into the following formula to obtain air saturated vapor pressure VP, wherein the formula is as follows:
the air saturated vapor pressure VP and the air relative humidity are then substituted into the following equation to obtain the air saturated vapor pressure difference VPD: and then, substituting the air saturated water vapor pressure difference VPD and the air relative humidity RH into the following formula to obtain the water content DFMC of the 10-h dead combustible, wherein the formula is as follows: DFMC ═ a × e-b*VPD+ c RH-d, a value 28.25786-30.61963, b value 1.04652-2.07710, c value 0.05520-0.75358, d value 5.99783-7.14584.
Compared with the traditional method for measuring the water content of the dead combustible 10-h on the forest ground surface by simply utilizing the air temperature and the air relative humidity, the method for estimating the water content of the dead combustible 10-h combines the saturated steam pressure difference and the air relative humidity to estimate the water content of the dead combustible 10-h. Firstly, obtaining the air temperature and the air relative humidity of the dead combustible material, and then substituting the air temperature into a formula
Obtaining the saturated vapor pressure of air, substituting the air humidity and the saturated vapor pressure of air into the formula VPD-VP-RH to obtain the saturated vapor pressure difference of air, and finally substituting the saturated vapor pressure difference of air and the relative humidity of air into the formula DFMC-a-e-b*VPDAnd + c RH-d, obtaining the water content of the dead combustible material of 10-h. The method is simple to operate, can quickly estimate the water content of the dead combustible materials within 10-h, can improve the precision of measuring the water content of the dead combustible materials, and has very important significance for controlling forest fire risks.
In order to improve the estimation precision, the value of a is preferredThe value of b is preferably 1.19739, the value of c is preferably 0.13484, and the value of d is preferably 6.69382, which is 29.28935. The formula determined by the parameters is verified to determine the exponential coefficient R of the formula2Is 0.83. The comparison of the effect of the present invention with the conventional estimation of 10-h dead combustible water content is shown in FIG. 2, wherein the first solid line from top to bottom is 1: 1; the third line is the effect of the traditional method for estimating the water content of the 10-h dead combustible, and the third line is the fitting trend line of the traditional method, R20.77, RMSE 6.72; the second first point is the result of the estimation of the water content of the dead combustible of 10-h, the second line is a fitting trend line, R2It was 0.83 and RMSE was 4.24. Therefore, compared with the traditional estimation method, the estimation effect of the water content of the dead combustible 10-h on the forest surface is obviously improved.
Claims (5)
1. A method for estimating the water content of dead combustible 10-h on the forest surface comprises the following steps:
step 1: collecting air temperature T and air relative humidity RH corresponding to the positions of the dead combustible materials on the forest surface;
step 2: calculating the saturated water vapor pressure VP of the air by adopting the following formula;
and step 3: calculating the air saturation vapor pressure difference VPD by adopting the following formula;
VPD＝VP-VP*RH
and 4, step 4: calculating the water content DFMC of the dead combustible material within 10-h by adopting the following formula;
DFMC＝a*e-b*VPD+c*RH-d
wherein the value of a is 28.25786-30.61963, the value of b is 1.04652-2.07710, the value of c is 0.05520-0.75358, and the value of d is 5.99783-7.14584.
2. The method for estimating the water content of the 10-h dead combustible on the forest surface as claimed in claim 1, wherein the value a is 29.28935.
3. The method for estimating the water content of the 10-h dead combustible on the forest surface as claimed in claim 1, wherein the value b is 1.19739.
4. The method for estimating the water content of the 10-h dead combustible on the forest surface as claimed in claim 1, wherein the c value is 0.13484.
5. The method for estimating the water content of the 10-h dead combustible on the forest surface as claimed in claim 1, wherein the d value is 6.69382.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011477253.XA CN112462028B (en) | 2020-12-15 | 2020-12-15 | Method for estimating water content of 10-h dead combustible on forest ground surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011477253.XA CN112462028B (en) | 2020-12-15 | 2020-12-15 | Method for estimating water content of 10-h dead combustible on forest ground surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112462028A CN112462028A (en) | 2021-03-09 |
| CN112462028B true CN112462028B (en) | 2021-07-06 |
Family
ID=74804277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011477253.XA Active CN112462028B (en) | 2020-12-15 | 2020-12-15 | Method for estimating water content of 10-h dead combustible on forest ground surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112462028B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113486286B (en) * | 2021-06-08 | 2023-04-07 | 电子科技大学 | Method for estimating water content of 10-h dead combustible by combining deep learning and physical model |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106951992A (en) * | 2017-03-20 | 2017-07-14 | 上海事凡物联网科技有限公司 | The Forecasting Methodology and system, server of a kind of surface fuel moisture content |
| CN108520363A (en) * | 2018-04-18 | 2018-09-11 | 电子科技大学 | A kind of appraisal procedure for predicting the following phase forest fire occurrence risk |
| CN109387452A (en) * | 2018-10-15 | 2019-02-26 | 东北林业大学 | Forest land surface dead combustible fuel hydrated comples ion system based on artificial neural network |
| CN111369119A (en) * | 2020-02-26 | 2020-07-03 | 山东超越数控电子股份有限公司 | Method, device and readable storage medium for predicting water content of forest surface dead combustible |
-
2020
- 2020-12-15 CN CN202011477253.XA patent/CN112462028B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106951992A (en) * | 2017-03-20 | 2017-07-14 | 上海事凡物联网科技有限公司 | The Forecasting Methodology and system, server of a kind of surface fuel moisture content |
| CN108520363A (en) * | 2018-04-18 | 2018-09-11 | 电子科技大学 | A kind of appraisal procedure for predicting the following phase forest fire occurrence risk |
| CN109387452A (en) * | 2018-10-15 | 2019-02-26 | 东北林业大学 | Forest land surface dead combustible fuel hydrated comples ion system based on artificial neural network |
| CN111369119A (en) * | 2020-02-26 | 2020-07-03 | 山东超越数控电子股份有限公司 | Method, device and readable storage medium for predicting water content of forest surface dead combustible |
Non-Patent Citations (2)
| Title |
|---|
| Predicting dead fine fuel moisture at regional scales using vapour pressure deficit from MODIS and gridded weather data;Rachael H.Nolan等;《Remote Sensing of Environment》;20160301(第 174期);100-108 * |
| 多模型耦合下的植被冠层可燃物含水率遥感反演;全兴文等;《遥感学报》;20190131(第1期);62-77 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112462028A (en) | 2021-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Flato et al. | Warming asymmetry in climate change simulations | |
| Salter et al. | An empirically derived inorganic sea spray source function incorporating sea surface temperature | |
| CN111551961B (en) | Cloud condensation nuclear number concentration vertical profile inversion method based on multi-wavelength laser radar | |
| Pingintha et al. | Assessment of the soil CO2 gradient method for soil CO2 efflux measurements: comparison of six models in the calculation of the relative gas diffusion coefficient | |
| Madugundu et al. | Performance of the METRIC model in estimating evapotranspiration fluxes over an irrigated field in Saudi Arabia using Landsat-8 images | |
| CN112462028B (en) | Method for estimating water content of 10-h dead combustible on forest ground surface | |
| Zhu et al. | Mercury vapor air–surface exchange measured by collocated micrometeorological and enclosure methods–Part I: Data comparability and method characteristics | |
| Zhang et al. | Using continuous stable isotope measurements to partition net ecosystem CO2 exchange | |
| Sun et al. | Partitioning oak woodland evapotranspiration in the rocky mountainous area of North China was disturbed by foreign vapor, as estimated based on non-steady-state 18O isotopic composition | |
| Forest et al. | Inferring climate system properties using a computer model | |
| Castellvi et al. | Estimating sensible and latent heat fluxes over rice using surface renewal | |
| Constantin et al. | Flux partitioning between understorey and overstorey in a boreal spruce/pine forest determined by the eddy covariance method | |
| CN108680268A (en) | A kind of Bevis model refinement methods of the sub-region right mean temperature based on sounding data | |
| Longobardi et al. | Relating soil moisture and air temperature to evapotranspiration fluxes during inter-storm periods at a Mediterranean experimental site | |
| Nagai | Validation and sensitivity analysis of a new atmosphere–soil–vegetation model | |
| Rantala et al. | Continuous flux measurements of VOCs using PTR-MS–reliability and feasibility of disjunct-eddy-covariance, surface-layer-gradient, and surfacelayer-profile methods | |
| Itier et al. | Downwind evolution of scalar fluxes and surface resistance under conditions of local advection. Part I: a reappraisal of boundary conditions | |
| Weligepolage et al. | Effect of sub-layer corrections on the roughness parameterization of a Douglas fir forest | |
| Villagarcía et al. | Sensitivity of a clumped model of evapotranspiration to surface resistance parameterisations: Application in a semi-arid environment | |
| Sinha et al. | Climate sensitivity and tropical moisture distribution | |
| Sawhney et al. | Determination of drying constants and their dependence on drying air parameters for thin layer onion drying | |
| Zawilski | Wind speed influences corrected Autocalibrated Soil Evapo-respiration Chamber (ASERC) evaporation measures | |
| CN202049094U (en) | Quick stabilizing apparatus for coal rock pulverized coal equilibrium water | |
| Mölder et al. | Water vapor, CO2, and temperature profiles in and above a forest—accuracy assessment of an unattended measurement system | |
| Desjardins et al. | Measurements of greenhouse gas fluxes using aircraft‐and tower‐based techniques |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |