CN113111567A - Evapotranspiration component separation method, component separation device, apparatus, and medium - Google Patents
Evapotranspiration component separation method, component separation device, apparatus, and medium Download PDFInfo
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Abstract
The invention discloses a evapotranspiration component separation method, a component separation device, equipment and a medium, and relates to the technical field of earth observation. The evapotranspiration component separation method comprises the following steps: acquiring terrestrial surface evapotranspiration data, land cover and environmental characteristic data in a preset space region within a certain time; inputting environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and executing the natural evapotranspiration estimation model by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover; and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. The evapotranspiration component separation method of the embodiment of the invention improves the management effectiveness of water resources.
Description
Technical Field
The invention relates to the technical field of earth observation, in particular to a evapotranspiration component separation method, a component separation device, equipment and a medium.
Background
The land surface evapotranspiration data is a key parameter of watershed water circulation and is a key variable for measuring land surface water resource consumption intensity and land surface water resource total amount. The formation mechanism of the terrestrial surface evapotranspiration is extremely complex, is a result of the comprehensive action of the natural and human activities, realizes the separation of the contribution degree of the human activities and the natural actions in the terrestrial surface evapotranspiration, and has great significance for improving the management of the drainage basin scale water resources. In the related art, the total terrestrial evapotranspiration data of the drainage basin is monitored by remote sensing. And simulating the terrestrial surface evapotranspiration of the drainage basin in a natural state by using the terrestrial hydrological model to obtain terrestrial surface evapotranspiration data caused by natural factors. The terrestrial evapotranspiration data caused by artificial factors is obtained from the total terrestrial evapotranspiration data and terrestrial evapotranspiration data caused by natural factors. However, the underlying surface condition is changing from time to time, even quite significantly. The land hydrological model cannot accurately simulate the evaporation and the emission of the land surface of the drainage basin in a natural state, the accuracy of the evaporation and the emission data of the land surface, which are obtained by simulation and are caused by natural factors, is reduced, and the separation accuracy of the evaporation and the emission data of the land surface, which are caused by natural factors and artificial factors, in the total evaporation and the emission data of the land surface is reduced.
Disclosure of Invention
In order to overcome the problems in the related art, embodiments of the present invention provide a method, a device, an apparatus, and a medium for separating evapotranspiration components, which improve the accuracy of separating terrestrial evapotranspiration data caused by natural factors from terrestrial evapotranspiration data caused by artificial factors in total terrestrial evapotranspiration data.
According to a first aspect of embodiments of the present invention, there is provided a method of evapotranspiration component separation for terrestrial evapotranspiration data, comprising:
acquiring terrestrial surface evapotranspiration data and environmental characteristic data of a land cover in a preset space region within a certain time scale, wherein the land cover comprises an artificial land cover and a natural land cover; inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, wherein the natural evapotranspiration estimation model is executed by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover;
and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover.
Optionally, the evapotranspiration component separation method further comprises:
and obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the land cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the land cover.
Optionally, before the inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration prediction model executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the artificial land cover, the component separation method further includes:
and establishing the natural evapotranspiration estimation model based on a machine learning algorithm.
Optionally, the environmental characteristic data of the artificial groundcover comprises: weather data, terrain data, and geographic location data.
Optionally, before the inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration prediction model executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the artificial land cover, the component separation method further includes:
unifying the spatial resolution and the spatial coordinate system of the land cover data, the land surface evapotranspiration data and the environmental characteristic data of the land cover.
Optionally, the establishing the natural evapotranspiration prediction model based on the machine learning algorithm includes:
establishing a natural evapotranspiration estimation target model based on a machine learning algorithm;
establishing a training sample based on the terrestrial surface evapotranspiration data and the environmental characteristic data of the natural land cover;
and training the natural evapotranspiration estimation target model by using the training sample to obtain the natural evapotranspiration estimation model.
According to a second aspect of embodiments of the present invention, there is provided a evapotranspiration component separation device for terrestrial evapotranspiration data, comprising:
the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring terrestrial evapotranspiration data and environmental characteristic data of a ground cover in a preset space area within a certain time scale, and the ground cover comprises an artificial ground cover and a natural ground cover;
the separation unit is used for inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by computer equipment to obtain first terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the artificial land cover;
and the first computing unit is used for obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover.
Optionally, the component separation device further comprises:
and the second computing unit is used for obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the cover.
According to a third aspect of embodiments of the present invention, there is provided a computer apparatus comprising:
a memory for storing computer executable code;
a processor for executing the computer executable code to implement the above-described method.
According to a fourth aspect of embodiments of the present invention, there is provided a computer-readable medium characterized by computer-executable code that, when executed by a processor, implements the method described above.
According to the evapotranspiration component separation method, the evapotranspiration component separation device, the evapotranspiration equipment and the evapotranspiration medium, terrestrial surface evapotranspiration data and environmental characteristic data of a ground cover in a preset space region are obtained within a certain time scale, wherein the ground cover comprises an artificial ground cover and a natural ground cover; inputting environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and executing the natural evapotranspiration estimation model by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover; and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. The natural evapotranspiration estimation model can accurately simulate the drainage basin land surface evapotranspiration in a natural state, the accuracy of estimated land surface evapotranspiration data caused by natural factors is improved, the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the land surface evapotranspiration data of the artificial land cover are improved, and the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the total land surface evapotranspiration data of the land cover is further improved.
And obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the land cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the land cover. And the ratio of the third terrestrial surface evapotranspiration data to the terrestrial surface evapotranspiration data of the land cover is the percentage of contribution of natural factors in the preset space area to terrestrial surface evapotranspiration within the certain time scale. And the difference value of the percentage of contribution of the natural factors to the terrestrial surface evapotranspiration is the percentage of contribution of the artificial factors to the terrestrial surface evapotranspiration in the preset space region within the certain time scale. The component separation method in the embodiment of the invention realizes the separation of natural factors and human activity contribution degree in terrestrial surface evapotranspiration of the land cover in the preset space area within a certain time scale, and improves the management effectiveness of water resources.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic flow diagram of an evapotranspiration composition separation method for terrestrial evapotranspiration data according to one embodiment of the invention.
FIG. 2 shows a schematic flow diagram of an evapotranspiration composition separation method for terrestrial evapotranspiration data according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention.
FIG. 4 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention.
FIG. 5 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention. The figures are not necessarily drawn to scale.
FIG. 1 shows a schematic flow diagram of an evapotranspiration composition separation method for terrestrial evapotranspiration data according to one embodiment of the invention. The method specifically comprises the following steps:
in step S110, terrestrial evapotranspiration data and environmental characteristic data of a cover in a preset spatial region over a certain time scale are acquired, the cover being divided into a natural cover and an artificial cover.
In this step, terrestrial evapotranspiration data and environmental characteristic data of the land cover in a preset spatial region within a certain time scale are acquired. The term "ground cover" means a ground cover such as natural or artificial vegetation and buildings which can be observed directly or by remote sensing means, and is a complex of natural and artificial structures covering the ground. The ground cover is divided into a natural ground cover and an artificial ground cover according to the nature of the ground cover. The artificial ground cover includes farmlands, construction lands, artificial water surfaces, artificial landscapes and the like. Terrestrial evapotranspiration occurring in natural ground cover is considered to be evapotranspiration resulting from natural process effects, while terrestrial evapotranspiration occurring in artificial ground cover is considered to be evapotranspiration resulting from natural and human coupling effects.
In some embodiments, the environmental characteristic data of the coverlet comprises: weather data, terrain data, and geographic location data. And unifying the spatial resolution and the spatial coordinate system of the land cover data, the land surface evapotranspiration data and the environmental characteristic data of the land cover. For example, the spatial resolution and the spatial coordinate system of the terrestrial evapotranspiration data are taken as references, the spatial resolution of the environmental characteristic data and the terrestrial evapotranspiration data is converted into the same spatial resolution as the terrestrial evapotranspiration data by adopting a resampling and projection conversion method, and the projection coordinates of the environmental characteristic data and the terrestrial evapotranspiration data are converted into the same spatial coordinate system as the terrestrial evapotranspiration data.
In some embodiments, terrestrial evapotranspiration data and environmental characteristic data for land cover in an annual-scale territory are obtained. The meteorological data includes total annual precipitation, total annual net radiation, annual average maximum temperature, annual average minimum temperature, annual average water pressure and annual average sunshine hours. Terrain data includes elevation, grade, and elevation. The geographic location data includes longitude and latitude. For example, the terrestrial evapotranspiration data adopts a PML evapotranspiration data set of a Peneman-Monte-Luning (PML) model, the spatial resolution is 500m, and the projection mode is WGS84 space coordinate system projection. The meteorological data adopts a 3 rd version day-by-day surface meteorological data set (DAYMET _ V3), the total rainfall, the annual total net radiation, the annual average maximum temperature, the annual average minimum temperature, the annual average water pressure and the annual average sunshine duration of a drainage basin are extracted, the spatial resolution of the data set is 1km, and the data set is sampled to be 500m by adopting a resampling method. The terrain data adopts a digital elevation data set (SRTM DEM) with the spatial resolution of 30m, corresponding gradient and slope are calculated by utilizing the gradient and slope calculation function of spatial analysis, and the three variables of the elevation, the gradient and the slope are sampled into the elevation, the gradient and the slope data set with the spatial resolution of 500m in a resampling mode. The ground cover data adopts a ground cover data set (MCD12Q1) of a U.S. medium-resolution imaging spectrometer, the spatial resolution of the data set is 500m, the projection mode is forward rotation projection, and the projection of the data set is converted into the projection of a WGS84 spatial coordinate system by adopting a re-projection method. Taking the separation system of the US MCD12Q1 landcover data set as an example, the agricultural land, the construction land and the artificial water surface in the landcover are divided into the artificial landcover, and the residual landcover is divided into the natural landcover. Meanwhile, the meteorological data, the topographic data and the geographic position data are classified equally according to the property of the land cover, and the difference of the meteorological data, the topographic data and the geographic position data in dimension is eliminated by adopting a normalization method.
In step S120, the environmental characteristic data of the artificial land cover is input into a natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in terrestrial surface evapotranspiration data of the artificial land cover.
In the step, the environmental characteristic data of the artificial land cover is input into a natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover. It should be noted that, before the environmental characteristic data of the artificial land cover is input into the natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by the computer device to obtain the first terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the artificial land cover, the component separation method of the embodiment of the invention further includes: based on machineAnd (4) establishing a natural evapotranspiration estimation model by a learning algorithm. The establishing of the natural evapotranspiration estimation model based on the machine learning algorithm comprises the following steps: establishing a natural evapotranspiration estimation target model based on a machine learning algorithm; establishing a training sample based on the terrestrial evapotranspiration data and the environmental characteristic data of the natural land cover; and training a natural evapotranspiration estimation target model by using the training samples to obtain a natural evapotranspiration estimation model. In the process of training the natural evapotranspiration estimation target model, a machine learning algorithm is utilized to mine an internal correlation mechanism of terrestrial evapotranspiration data and environmental characteristic data of the natural land cover, a grid-by-grid searching method is adopted to optimize target model parameters, and K-time cross validation is used to promote fitting longitude of the target model, so that the natural evapotranspiration estimation model is constructed. Taking the machine learning algorithm as an example of a random forest algorithm, in the process of training a natural evapotranspiration estimation target model, the random forest algorithm is adopted (the value range of a tree is set to be [50,100,150,200,250,300 ]]) And optimizing parameters of the target model, namely the optimal tree, by using a grid-by-grid search optimization and 3-time cross validation method. The constructed natural evapotranspiration estimation target model is as follows: the natural evapotranspiration estimate is F (environmental characteristic data) + residual. Using a determining coefficient R2And judging the fitting precision of the target model, and judging the influence degree of the environmental characteristic data on the natural evapotranspiration estimated value by using a weight judgment function in a random forest algorithm.
In step S130, second terrestrial globe evapotranspiration data caused by an artifact in the terrestrial globe evapotranspiration data of the artificial land cover is obtained based on the first terrestrial globe evapotranspiration data and the terrestrial globe evapotranspiration data of the artificial land cover.
In this step, second terrestrial surface evapotranspiration data caused by an artifact in the terrestrial surface evapotranspiration data of the artificial land cover is obtained based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. In some embodiments, the difference between the terrestrial evapotranspiration data of the artificial land cover and the first terrestrial evapotranspiration data is used as the second terrestrial evapotranspiration data caused by the artifact in the terrestrial evapotranspiration data of the artificial land cover by using a method of space grid calculation.
In the embodiment of the invention, the terrestrial surface evapotranspiration data and the environmental characteristic data of the land cover in a preset space area within a certain time scale are acquired, wherein the land cover comprises an artificial land cover and a natural land cover; inputting environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and executing the natural evapotranspiration estimation model by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover; and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. The natural evapotranspiration estimation model can accurately simulate the drainage basin land surface evapotranspiration in a natural state, the accuracy of estimated land surface evapotranspiration data caused by natural factors is improved, the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the land surface evapotranspiration data of the artificial land cover are improved, and the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the total land surface evapotranspiration data of the land cover is further improved.
FIG. 2 shows a schematic flow diagram of an evapotranspiration composition separation method for terrestrial evapotranspiration data according to an embodiment of the invention. The method specifically comprises the following steps:
in step S210, terrestrial evapotranspiration data and environmental characteristic data of a cover in a preset spatial region over a time scale are acquired, the cover including an artificial cover and a natural cover.
In step S220, the environmental characteristic data of the artificial land cover is input into a natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in terrestrial surface evapotranspiration data of the artificial land cover.
In step S230, second terrestrial globe evapotranspiration data caused by an artifact in the terrestrial globe evapotranspiration data of the artificial land cover is obtained based on the first terrestrial globe evapotranspiration data and the terrestrial globe evapotranspiration data of the artificial land cover.
Steps S210 to S230 are identical to steps S110 to S130 shown in fig. 1, and are not described herein again.
In step S240, third terrestrial evaporation data caused by natural factors in the terrestrial evaporation data of the cover is obtained based on the second terrestrial evaporation data and the terrestrial evaporation data of the cover.
In this step, third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the cover is obtained based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the cover. In some embodiments, the difference between the terrestrial vapor deposition data of the cover and the second terrestrial vapor deposition data is used as the third terrestrial vapor deposition data caused by natural factors in the terrestrial vapor deposition data of the cover by using a method of space grid calculation. And the ratio of the third terrestrial surface evapotranspiration data to the terrestrial surface evapotranspiration data of the land cover is the percentage of contribution of natural factors in the preset space area to terrestrial surface evapotranspiration within the certain time scale. And the difference value of the percentage of contribution of the natural factors to the terrestrial surface evapotranspiration is the percentage of contribution of the artificial factors to the terrestrial surface evapotranspiration in the preset space region within the certain time scale.
In the embodiment of the invention, the third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the cover is obtained based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the cover. And the ratio of the third terrestrial surface evapotranspiration data to the terrestrial surface evapotranspiration data of the land cover is the percentage of contribution of natural factors in the preset space area to terrestrial surface evapotranspiration within the certain time scale. And the difference value of the percentage of contribution of the natural factors to the terrestrial surface evapotranspiration is the percentage of contribution of the artificial factors to the terrestrial surface evapotranspiration in the preset space region within the certain time scale. The component separation method in the embodiment of the invention realizes the separation of natural factors and human activity contribution degree in terrestrial surface evapotranspiration of the land cover in the preset space area within a certain time scale, and improves the management effectiveness of water resources.
FIG. 3 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention. The evaporant component separating device 300 includes a first acquiring unit 310, a separating unit 320, and a first calculating unit 330.
A first obtaining unit 310, configured to obtain terrestrial evapotranspiration data and environmental characteristic data of a cover in a preset spatial region within a certain time scale, where the cover includes an artificial cover and a natural cover. A separating unit 320, configured to input the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, where the natural evapotranspiration estimation model is executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in terrestrial surface evapotranspiration data of the artificial land cover. A first calculating unit 330, configured to obtain second terrestrial surface evapotranspiration data caused by an artifact in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover.
FIG. 4 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention. The separation apparatus 400 includes a first acquisition unit 410, a separation unit 420, a first calculation unit 430, and a second calculation unit 440.
A first obtaining unit 410, configured to obtain terrestrial evapotranspiration data and environmental characteristic data of a cover in a preset spatial region within a certain time scale, where the cover includes an artificial cover and a natural cover. A separation unit 420, configured to input the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, where the natural evapotranspiration estimation model is executed by a computer device to obtain first terrestrial surface evapotranspiration data caused by natural factors in terrestrial surface evapotranspiration data of the artificial land cover. A first calculating unit 430, configured to obtain second terrestrial surface evapotranspiration data caused by an artifact in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. A second calculating unit 440, configured to obtain third terrestrial globe evapotranspiration data caused by natural factors in the terrestrial globe evapotranspiration data of the cover based on the second terrestrial globe evapotranspiration data and the terrestrial globe evapotranspiration data of the cover.
Since the steps of the method for separating a evaporant component using the evaporant component separating device have been described in detail in the above embodiments of the method, they will not be described in detail.
FIG. 5 is a schematic diagram of a evapotranspiration component separation device for terrestrial evapotranspiration data according to one embodiment of the invention. The apparatus shown in fig. 5 is only an example and should not limit the functionality and scope of use of embodiments of the present invention in any way.
Referring to fig. 5, the apparatus includes a processor 510, a memory 520, and an input-output device 530 connected by a bus. Memory 520 includes Read Only Memory (ROM) and Random Access Memory (RAM), and memory 520 stores various computer instructions and data needed to perform system functions, and processor 510 reads the various computer instructions from memory 520 to perform various appropriate actions and processes. The input-output device 530 includes an input section of a keyboard, a mouse, or the like; an output section including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section including a hard disk and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. Memory 520 also stores computer instructions to perform the operations specified in the component separation method of embodiments of the present invention.
Accordingly, an embodiment of the present invention provides a computer device, including: a memory for storing computer executable code; a processor for executing the computer executable code to implement the above-described method.
Accordingly, embodiments of the present invention provide a computer-readable medium comprising computer-executable code that, when executed by a processor, implements the method described above.
According to the evapotranspiration component separation method, the evapotranspiration component separation device, the evapotranspiration equipment and the evapotranspiration medium, terrestrial surface evapotranspiration data and environmental characteristic data of a ground cover in a preset space region are obtained within a certain time scale, wherein the ground cover comprises an artificial ground cover and a natural ground cover; inputting environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and executing the natural evapotranspiration estimation model by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover; and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover. The natural evapotranspiration estimation model can accurately simulate the drainage basin land surface evapotranspiration in a natural state, the accuracy of estimated land surface evapotranspiration data caused by natural factors is improved, the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the land surface evapotranspiration data of the artificial land cover are improved, and the separation accuracy of the land surface evapotranspiration data caused by natural factors and the separation accuracy of the land surface evapotranspiration data caused by artificial factors in the total land surface evapotranspiration data of the land cover is further improved.
And obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the land cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the land cover. And the ratio of the third terrestrial surface evapotranspiration data to the terrestrial surface evapotranspiration data of the land cover is the percentage of contribution of natural factors in the preset space area to terrestrial surface evapotranspiration within the certain time scale. And the difference value of the percentage of contribution of the natural factors to the terrestrial surface evapotranspiration is the percentage of contribution of the artificial factors to the terrestrial surface evapotranspiration in the preset space region within the certain time scale. The component separation method in the embodiment of the invention realizes the separation of natural factors and human activity contribution degree in terrestrial surface evapotranspiration of the land cover in the preset space area within a certain time scale, and improves the management effectiveness of water resources.
The flowcharts and block diagrams in the figures and block diagrams illustrate the possible architectures, functions, and operations of the systems, methods, and apparatuses according to the embodiments of the present invention, and may represent a module, a program segment, or merely a code segment, which is an executable instruction for implementing a specified logical function. It should also be noted that the executable instructions that implement the specified logical functions may be recombined to create new modules and program segments. The blocks of the drawings, and the order of the blocks, are thus provided to better illustrate the processes and steps of the embodiments and should not be taken as limiting the invention itself.
The above description is only a few embodiments of the present invention, and is not intended to limit the present invention, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for evapotranspiration composition separation for terrestrial evapotranspiration data, comprising:
acquiring terrestrial surface evapotranspiration data and environmental characteristic data of a land cover in a preset space region within a certain time scale, wherein the land cover comprises an artificial land cover and a natural land cover;
inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, wherein the natural evapotranspiration estimation model is executed by computer equipment to obtain first land surface evapotranspiration data caused by natural factors in the land surface evapotranspiration data of the artificial land cover;
and obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover.
2. The evapotranspiration component separation method of claim 1, further comprising:
and obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the land cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the land cover.
3. The evapotranspiration component separation method of claim 1, wherein the inputting of the environmental characteristic data of the artificial groundcover into a natural evapotranspiration prediction model, the natural evapotranspiration prediction model being executed by a computer device before obtaining first terrestrial evapotranspiration data caused by natural factors in the terrestrial evapotranspiration data of the artificial groundcover, the component separation method further comprising: and establishing the natural evapotranspiration estimation model based on a machine learning algorithm.
4. The evapotranspiration component separation method of claim 1, wherein the environmental characteristic data of the artificial groundcover includes: weather data, terrain data, and geographic location data.
5. The evapotranspiration component separation method according to claim 2, wherein the environmental characteristic data of the artificial groundcover is input into a natural evapotranspiration prediction model, and the component separation method further comprises, before the natural evapotranspiration prediction model is executed by a computer device to obtain first terrestrial evapotranspiration data caused by natural factors in the terrestrial evapotranspiration data of the artificial groundcover:
unifying the spatial resolution and the spatial coordinate system of the land cover data, the land surface evapotranspiration data and the environmental characteristic data of the land cover.
6. The evapotranspiration component separation method of claim 3, wherein the establishing the natural evapotranspiration prediction model based on a machine learning algorithm includes:
establishing a natural evapotranspiration estimation target model based on a machine learning algorithm;
establishing a training sample based on the terrestrial surface evapotranspiration data and the environmental characteristic data of the natural land cover;
and training the natural evapotranspiration estimation target model by using the training sample to obtain the natural evapotranspiration estimation model.
7. An evapotranspiration composition separation device for terrestrial evapotranspiration data, comprising:
the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring terrestrial evapotranspiration data and environmental characteristic data of a ground cover in a preset space area within a certain time scale, and the ground cover comprises an artificial ground cover and a natural ground cover;
the separation unit is used for inputting the environmental characteristic data of the artificial land cover into a natural evapotranspiration estimation model, and the natural evapotranspiration estimation model is executed by computer equipment to obtain first terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the artificial land cover;
and the first computing unit is used for obtaining second terrestrial surface evapotranspiration data caused by artificial factors in the terrestrial surface evapotranspiration data of the artificial land cover based on the first terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the artificial land cover.
8. The evaporative component separation apparatus of claim 7, further comprising:
and the second computing unit is used for obtaining third terrestrial surface evapotranspiration data caused by natural factors in the terrestrial surface evapotranspiration data of the cover based on the second terrestrial surface evapotranspiration data and the terrestrial surface evapotranspiration data of the cover.
9. A computer device, comprising:
a memory for storing computer executable code;
a processor for executing the computer executable code to implement the method of any one of claims 1-6.
10. A computer-readable medium comprising computer-executable code that, when executed by a processor, performs the method of any of claims 1-6.
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