CN110738358B - Ecological flow guaranteeing method and device based on land utilization mode optimization - Google Patents

Ecological flow guaranteeing method and device based on land utilization mode optimization Download PDF

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CN110738358B
CN110738358B CN201910900755.XA CN201910900755A CN110738358B CN 110738358 B CN110738358 B CN 110738358B CN 201910900755 A CN201910900755 A CN 201910900755A CN 110738358 B CN110738358 B CN 110738358B
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land
runoff
hydrological
target river
data
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CN110738358A (en
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黄伟
刘晓波
彭文启
刘之平
王卓微
葛金金
张汶海
吴雷祥
张盼伟
向晨光
宋基权
岳珍珍
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China Institute of Water Resources and Hydropower Research
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China Institute of Water Resources and Hydropower Research
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00Administration; Management
    • G06Q10/04Forecasting or optimisation, e.g. linear programming, "travelling salesman problem" or "cutting stock problem"
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/10Services
    • G06Q50/26Government or public services

Abstract

An ecological flow guaranteeing method and device based on land utilization mode optimization. The method comprises the following steps: respectively simulating the runoff of a target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff; determining a runoff threshold of the target river based on the hydrologic variable deviation degree of the hydrologic change index; and determining a first land utilization planning mode capable of guaranteeing the ecological flow according to the simulation results of the plurality of radial flows and the radial flow threshold. According to the ecological flow guaranteeing method and device based on the land utilization mode optimization, provided by the embodiment of the invention, the land utilization type can be reasonably planned, and further the ecological flow of a river is guaranteed.

Description

Ecological flow guaranteeing method and device based on land utilization mode optimization
Technical Field
The invention relates to the technical field of water conservancy, in particular to an ecological flow guaranteeing method and device based on land utilization mode optimization.
Background
The ecological flow refers to the water quantity, time and water quality needed by the natural ecosystem of the riverway and the estuary and the ecosystem which depends on the survival and development of the human society.
With the rapid development of human society, the natural hydrological rhythm of rivers is seriously changed only by considering a plurality of factors such as the land utilization mode of urban development, and the health of the river ecosystem is seriously threatened.
Therefore, how to guarantee the ecological flow of the river by reasonably planning the land utilization type becomes a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides an ecological flow guaranteeing method and device based on land use mode optimization, which can reasonably plan land use types and guarantee ecological flow.
In a first aspect, an ecological flow guaranteeing method based on land use mode optimization is provided, and the method includes:
respectively simulating the runoff of a target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff;
determining a runoff threshold of the target river based on the hydrologic variable deviation degree of the hydrologic change index;
the method comprises the steps of obtaining a simulation result of the runoff rate in each land utilization planning mode by using a preset hydrological model, performing coupling analysis on the simulation result of the runoff rate in each land utilization planning mode and a runoff rate threshold value, obtaining a land utilization planning mode capable of guaranteeing the ecological flow, improving the protection strength of the ecological flow, and protecting the ecological flow more accurately.
In a second aspect, an ecological traffic guaranteeing method based on land use optimization is provided, and the method further includes:
determining a plurality of land use types for the target river based on the land use data for the target river;
and planning the land utilization types of the target river according to the contribution coefficient of each land utilization type to the radial flow change to obtain a plurality of land utilization planning modes.
The accuracy of the ecological flow guarantee of the target river can be improved by analyzing the target river in a targeted manner according to the land utilization data of the target river.
In a third aspect, the step of determining a plurality of land use types for the target river based on land use data for the target river comprises:
constructing a land utilization change transfer matrix according to land utilization data of the target river;
determining a plurality of land use types through the land use transfer matrix, wherein the land use transfer amount of each land use type is larger than a preset land conversion threshold value.
The land use types with frequent mutual conversion are selected through the preset land conversion threshold, the land use types having important influence on the ecological flow can be screened out, and the optimization accuracy of the land use mode can be improved.
In a fourth aspect, the step of simulating the runoff of a target river in multiple land use planning modes respectively through a hydrological model to obtain simulation results of multiple runoff comprises:
performing sub-basin division on the target river by utilizing a preset hydrological model according to basic data and a preset water collecting area threshold of the target river in each land utilization planning mode;
hydrologic response unit division is carried out to the sub-basin through presetting hydrologic response unit division rule, obtains the simulation result of the runoff that every land use planning mode corresponds, and wherein, it includes to preset hydrologic response unit division rule: a minimum soil type area proportion, and a minimum slope proportion of the watershed.
By dividing the target river according to the preset water collecting area and the preset hydrological response unit rule, a more accurate runoff simulation result can be obtained, and the accuracy of ecological flow guarantee can be improved.
In a fifth aspect, before the step of respectively simulating the runoff of the target river in multiple land use planning modes by presetting the hydrological model to obtain the simulation results of the multiple runoff, the method further comprises:
based on the hydrological parameter sensitivity analysis, the hydrological model parameters are screened, and the hydrological model parameters meeting a preset sensitivity threshold are used as model parameters of an initial hydrological model;
and calibrating the initial hydrological model based on the model evaluation index to obtain a preset hydrological model.
Through the screening to the parameter of initial hydrological model, can improve the simulation precision of hydrological model.
In a sixth aspect, the step of determining a first land use planning mode capable of guaranteeing ecological traffic according to the simulation results of the plurality of traffic and the traffic threshold includes:
and taking the land utilization planning mode corresponding to the simulation result of the runoff quantity greater than or equal to the runoff quantity threshold value as a first land utilization planning mode.
The RVA lower limit value which can keep and maintain the minimum requirement of the river ecosystem health is used as the runoff threshold value of the target river, so that the subsequent simulation result and the runoff simulation result are compared conveniently, and the land utilization planning mode capable of guaranteeing the ecological runoff is obtained.
In a seventh aspect, the land use planning method according to the first to sixth aspects includes:
the method comprises an initial land utilization mode, a returning tillage and forest planning mode, an ecological returning tillage planning mode and a basic area planning mode for protecting the arable land.
In an eighth aspect, an ecological flow guaranteeing device based on land use mode optimization is provided, the device comprising:
the simulation module is used for respectively simulating the runoff of the target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff;
the calculation module is used for determining the runoff threshold of the river based on the hydrologic variable deviation degree of the hydrologic change index;
and the determining module is used for determining a first land utilization planning mode capable of ensuring the ecological flow according to the simulation results of the plurality of runoff quantities and the runoff quantity threshold.
In a ninth aspect, an ecological flow guaranteeing device based on land use mode optimization is provided, the device comprising:
a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the ecological flow assurance method based on land use mode optimization according to the present invention.
In a tenth aspect, a computer storage medium is provided, where computer program instructions are stored on the computer storage medium, and when the computer program instructions are executed by a processor, the method for guaranteeing ecological flow based on optimization of land utilization provided by the present invention is implemented.
According to the ecological flow guaranteeing method, the device, the equipment and the medium based on the land utilization mode optimization, the preset hydrological model can be used for obtaining the simulation result of the runoff rate in each land utilization planning mode, the simulation result of the runoff rate in each land utilization planning mode and the runoff rate threshold value are subjected to coupling analysis, the land utilization planning mode capable of guaranteeing the ecological flow rate is obtained, the protection degree of the ecological flow rate is improved, and the ecological flow rate is protected more accurately.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating an ecological traffic guaranteeing method based on land use optimization according to an embodiment of the present invention;
FIG. 2 is a graph illustrating a simulation result of runoff volume according to an embodiment of the present invention;
FIG. 3 is a graph illustrating a runoff volume simulation result versus a runoff volume threshold in an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of an ecological flow guaranteeing device optimized based on a land use manner according to an embodiment of the invention;
fig. 5 shows a block diagram of an exemplary hardware architecture of an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The ecological flow has important significance for keeping the river ecosystem healthy and maintaining the biological composition, structure, function and the like of the river ecosystem. However, with the rapid development of human society, the construction of gate dam banks, the taking of water from outside of river channels, the increasing intensity of human activities and climate changes, the hydrological rhythm of rivers is seriously changed, the self-cleaning capability of rivers is basically lost, and the rivers are in sub-health state for a long time. The reason for this is that the ecological flow for maintaining the integrity of the river ecosystem cannot be guaranteed.
At present, most of protection methods for ecological flow guarantee the ecological flow of downstream riverways by changing or adjusting the operation mode of a dam. For example: 10% of the average runoff of the dam site for many years is taken as the ecological runoff of the spillover, but the mode does not consider the biological demand of the downstream river reach of the dam and lacks ecological basis. Moreover, ecology is guaranteed by changing the operation mode of the dam, time and labor are wasted, and the application of the dam can be influenced to a certain extent.
Therefore, the embodiment of the invention provides an ecological flow guaranteeing method, device, equipment and medium based on land utilization mode optimization, and ecological flow can be guaranteed through reasonable planning of land utilization types.
The method, the device, the equipment and the medium for guaranteeing the ecological flow based on the land use mode optimization provided by the embodiment of the invention are described below with reference to the attached drawings. It should be noted that these examples are not intended to limit the scope of the present disclosure. The ecological flow guaranteeing method based on the land use mode optimization according to the embodiment of the invention is described in detail by the aid of the figure 1.
In order to better understand the technical solution of the present invention, the method for guaranteeing ecological flow based on the land use mode optimization according to an embodiment of the present invention is described in detail below with reference to fig. 1, wherein the sand-september river is used as a target river. Fig. 1 is a flowchart illustrating an ecological traffic guaranteeing method based on land use optimization according to an embodiment of the present invention.
As shown in fig. 1, the ecological traffic guaranteeing method based on land use optimization in the embodiment of the present invention includes the following steps:
s101, respectively simulating the runoff of a target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff.
In one embodiment of the present invention, a plurality of land use types of the sand making river may be first determined based on land use data of the sand making river (target river). For example: the data of the land utilization of the sand Yinghe in 1990, 2000 and 2010 can be obtained to obtain the change of the land utilization of the sand Yinghe, as shown in table 1.
TABLE 1
Next, a land use change transfer matrix may be constructed from the land use data in Table 1. Wherein, the land use change transfer matrix is shown as expression (1).
Wherein S is the change area, n is the number of land utilization types, i and j are the land utilization types for researching the start and stop time, SijThe area of the ith land utilization type is converted into the area of the jth land utilization type in the research starting and ending time.
As an example, a 1990-2000 land use change transfer matrix as shown in table 2a and a 2000-2010 land use change transfer matrix as shown in table 2b can be obtained by expression (1) from the land use data in table 1 described above.
TABLE 2a
As can be seen from Table 2a, in 1990-2000In 10 years, the cultivated land area is reduced by 163.68 square kilometers (km)2) (i.e., 27622.70km total area for converting other land use types into cultivated land types2The total area converted from cultivated land type to other land use type is 27459.02km2The difference).
As can be seen by continuing reference to Table 2a, the reduction in cultivated land area of 163.68km resulted in the 10 years of 1990-2000-year2The main reason for (1) is that the cultivated land has 14.39km in 10 years2Converted into forest land area, and cultivated land has 13.35km2Converted into grassland area with 32.41km of cultivated land2Converted into water area with 437.67km cultivated land2And the land area is changed into the construction land area. Furthermore, there were 1.68km each2Area of unused land, 59.25km2Area of construction land, 45.54km2Area of water of 168.79km2Area of grass of 58.88km2The forest land area is changed into cultivated land.
TABLE 2b
As can be seen from Table 2b, the cultivated land area was reduced by 433.62km squared during the 10 years of 2000-20102(i.e., 27458.87km total area for converting other land use types into cultivated land types2The total area converted from cultivated land type to other land use type is 27025.25km2The difference).
As can be seen by continuing reference to Table 2b, the reduction in cultivated land area of 433.62km resulted in 10 years between 2000-20102The main reason for (1) is that the cultivated land has 44.71km in 10 years2Converted into water area with 423.26km cultivated land2And the land area is changed into the construction land area. In addition, there are 34.14km each2Area of construction land, 5.33km2Area of water of 0.78km2Area of grass of 3.11km2The forest land area is changed into cultivated land.
According to tables 2a and 2b, the land conversion area (which may also be a conversion frequency) of the forest land, the cultivated land, the grassland, and the construction land obtained by setting the land conversion threshold value is greater than the preset land conversion threshold value, and then the forest land, the cultivated land, the grassland, and the construction land are used as the land use type.
In the embodiment of the invention, the land use types which are frequently mutually converted are selected through the preset land conversion threshold, so that the land use types which have important influence on ecological flow can be screened out, and the optimization accuracy of the land use mode can be improved. In addition, the accuracy of ecological flow guarantee of the target river can be improved by analyzing the target river in a targeted manner according to the land utilization data of the target river.
Secondly, the land utilization type of the target river can be planned according to the contribution coefficient of each land utilization type to the radial flow, and a plurality of land utilization planning modes are obtained.
As an example, the contribution coefficient of 4 land utilization types of woodland, cultivated land, grassland and construction land to the radial flow rate can be obtained through Matrix Laboratory (MATLAB) simulation calculation. For example, the coefficient of contribution of the forest land to the runoff is obtained to be-1.18 m3/skm-1The contribution coefficient of the cultivated land to the radial flow is 3.43m3/skm-1The coefficient of contribution of the grassland to the radial flow is-1.41 m3/skm-1The contribution coefficient of the construction land to the radial flow is 1.24m3/skm-1
That is, the area of the cultivated land in the target river is reduced and the annual runoff volume is increased, which indicates that the cultivated land inhibits runoff, the infiltration of rainfall is easy because the topography of the cultivated land in the sand Yinghe river (target river) is gentle, and meanwhile, the infiltration process is promoted to a great extent because of cultivation activities such as plowing and the like, and the conversion of the rainfall to the runoff is inhibited.
The annual runoff volume generally appears to increase with increasing forest land area, indicating that the forest land has a runoff promoting effect, mainly due to the forest land's better moisture conserving function. The forest land is mostly located in the northwest and the southwest of the sand and Yinghe river, most of the forest land is a sloping area in a mountain and hilly area, the slope is large, runoff directly enters first after rainfall, and generally speaking, the stronger the rain is, the larger the flow rate is. The sand and Yinghe river is located in a temperate zone monsoon climate area, precipitation is mostly concentrated in summer and mostly reaches rainstorm, and canopy interception and forest land withering in a forest land area enable surface runoff to be reduced, precipitation infiltration is relatively small, and runoff is easily formed directly.
Annual runoff decreased with increasing area of turf showing that turf inhibits runoff. The grassland in the sand Yinghe river is flat in terrain, poor in water conservation capacity of the grassland with low and medium coverage and easy to rain infiltration, so that the grassland inhibits runoff.
Annual runoff increases along with the increase of construction land because economic development and urbanization progress are accelerated, so that the construction land areas of roads, infrastructures and the like are increased, the infiltration of rain is reduced, runoff is easily formed by rain, and the runoff depth of a drainage basin is increased.
Therefore, the land use type of the target river can be planned according to the calculation of the contribution coefficient of each land use type to the radial flow change and the existing land planning policy, so that a 4-land use planning mode is obtained.
As one example, the land use planning method may include:
the first method is as follows: an initial manner of land use (i.e., an existing manner of land use).
The second method comprises the following steps: and (4) a mode of returning the farmland to the forest (namely, setting all the farmlands with the gradient larger than 7 degrees as forest lands).
The third method comprises the following steps: an ecological retrogradation planning method (namely, all the unused land is used as the cultivated land, the cultivated land with the gradient larger than 5 degrees is used as the grassland, and other land utilization types are kept unchanged).
The method is as follows: a basic area planning method for protecting cultivated land (i.e., setting low-coverage grasslands in various types of garden grasslands such as forested areas, tracking areas, nurseries, orchards, mulberry gardens, tea gardens, hot-work forest gardens, and the like as cultivated land).
Next, in one embodiment of the present invention, a distributed hydrological model (Soil and Water Association Tool, SWAT) may be used as the initial hydrological model.
Sensitivity analysis is carried out on 28 parameters affecting the runoff by using SWAT-CUP software, and 11 parameters meeting the preset sensitivity threshold and having important influence on the runoff are screened out, as shown in Table 3.
TABLE 3
Wherein, the sensitivity of each parameter is represented by t, the larger the absolute value of t is, the more sensitive the parameter is, the degree of the parameter sensitivity is represented by p value, and the closer the p value is to 0, the more remarkable the sensitivity is.
The initial hydrological model of the hydrological model with 11 parameters having important influence on runoff after screening the parameters was rated. For example, Nash-Sutcliffe Nash coefficients (Ens) and correlation coefficients (R) can be utilized2) And (5) calibrating the screened initial hydrological model by using the model evaluation indexes to obtain a preset hydrological model.
In the embodiment of the invention, the simulation precision of the hydrological model can be improved by screening the parameters of the initial hydrological model, and the simulation precision of the hydrological model can be improved.
In one embodiment of the invention, the target river is divided into sub-basins by using the preset hydrological model according to the basic data and the preset water collecting area threshold of the target river in each land utilization planning mode.
Wherein, the basic data of the target river may be: spatial data and attribute data. The spatial data may be: a Digital Elevation Model (DEM) of the drainage basin, land use type data (data resolution of 1km) and soil type data (data resolution of 1 km); the attribute data may be: meteorological data (such as a daily actual measurement sequence in 1981-2015, which is composed of factors such as rainfall, air temperature, relative humidity, solar radiation amount and wind speed), soil attribute data and hydrological data.
And (3) dividing the sub-river basin of the target river according to the basic data of the target river in the land utilization planning mode and a preset water collection area threshold in the hydrological model.
In one embodiment of the present invention, the preset water collecting area threshold can be set to 40000 hectares (ha), and the target river can be divided into 47 sub-basins.
After the sub-basin division is carried out on the target river, the sub-basin is divided into hydrologic response units according to the preset hydrologic response unit division rule. And finally obtaining the simulation result of the runoff corresponding to each land utilization planning mode.
In one embodiment of the present invention, the preset hydrologic response unit division rule may be: a minimum soil type area proportion, and a minimum slope proportion of the watershed.
The area proportion of the minimum land utilization type of the drainage basin refers to the proportion of the minimum land utilization type to the total land utilization type in the divided drainage basin plates; the minimum soil type area proportion is the proportion of the area of the minimum soil type in all soil types in the drainage area; the minimum grade proportion refers to the proportion of the minimum grade to all grades of different grade.
As shown in fig. 2, fig. 2 is a schematic diagram illustrating a simulation result of the runoff volume according to an embodiment of the invention. By using the preset hydrological model, a simulation result of runoff corresponding to each land utilization planning mode can be obtained.
In the embodiment of the invention, the target river is divided according to the preset water collecting area and the preset hydrologic response unit rule, so that a more accurate runoff simulation result can be obtained, and the accuracy of ecological flow guarantee can be improved.
S102, determining a runoff threshold of the target river based on the hydrologic variable deviation degree of the hydrologic change index.
The hydrological Alteration Index (IHA) evaluates the variation range of river hydrological Alteration degree from five runoff hydrological characteristic values such as flow, time, frequency, duration and change rate.
The Range of Variability Approach (RVA) threshold describes the variable Range of ecological flux, i.e., the Range of variation that the natural river ecosystem can tolerate.
In one embodiment of the present invention, the degree of deviation of the hydrological variable for each hydrological change indicator can be calculated by expression (2).
Wherein D is the degree of change of each hydrologic change index, N0Number of years in which the hydrological change indicator falls within the RVA target in the observed number of years after the disturbance, NeRepresenting the number of years the hydrologic change indicator after the expected interference falls within the RVA target.
Furthermore, NeCan be calculated by expression (3).
Ne=NT×r (3)
Where NT is the number of years recorded for the flow sequence after the disturbance, and r is the ratio of the hydrologic change index before the disturbance falling within the RVA target.
As an example, when D ∈ (0-33%), it is a zero change or a low change; d belongs to 33-67 percent), belongs to moderate change; d ∈ [ 67-100% ], which is a height change.
In one embodiment of the present invention, 75% and 25% of the occurrence probability (i.e., D value) of the hydrologic change index can be used as the upper and lower limits of each index parameter. The lower limit of RVA is taken as the minimum requirement to maintain and maintain the health of the river ecosystem. The runoff volume threshold may be a lower limit of the RVA.
In the embodiment of the invention, the RVA lower limit value which can keep and maintain the minimum requirement of the river ecosystem health is used as the runoff threshold value of the target river, so that the subsequent simulation result and the runoff simulation result are convenient to compare, and a land utilization planning mode capable of ensuring ecological runoff can be realized.
S103, determining a first land utilization planning mode capable of guaranteeing the ecological flow according to the simulation results of the plurality of runoff quantities and the runoff quantity threshold.
As shown in fig. 3, fig. 3 is a graph illustrating a simulation result of runoff volume and a runoff volume threshold value according to an embodiment of the invention.
As can be seen from the graph, the runoff threshold of the target river is 28.75m in 8 months, 9 months and 12 months3/s、31.8m3S and 8.88m3And s. The simulation results of the runoff corresponding to the first mode are respectively 24.60m in 8 months, 9 months and 12 months3/s、29.09m3S and 8.74m3And s. The runoff volume simulation results corresponding to the second mode are 33.44m in 8 months, 9 months and 12 months respectively3/s、32.24m3S and 8.948m3And s. The runoff volume simulation results corresponding to the third mode are respectively 28.44m in 8 months, 9 months and 12 months3/s、32.24m3S and 8.35m3And s. The runoff volume simulation results corresponding to mode four were 22.25m at 8 months, 9 months, and 12 months, respectively3/s、27.04m3S and 7.56m3/s。
In summary, it can be obtained through analysis that only the simulation results of the runoff volume corresponding to the land utilization planning method of the second mode are all higher than the runoff volume threshold, and therefore the land utilization planning method corresponding to the second mode is used as the first land utilization method.
For example, in the second mode (returning to forest planning mode), the cultivated land area is reduced by 126.24km based on the original land utilization mode2Increase the forest land area to 111.58km2The river ecosystem integrity can be maintained, namely, the land surface hydrological saving rate (natural hydrology is ecological flow) is improved by returning to the forest.
It should be understood that the land use planning method capable of guaranteeing the ecological flow is referred to as a first land use planning method, and is only to distinguish from other land use planning methods, and the land use planning method does not impose any limitation on the energy for guaranteeing the ecological flow.
The ecological flow guaranteeing device based on the land utilization optimization according to the embodiment of the present invention is described in detail below with reference to fig. 4, and the ecological flow guaranteeing device based on the land utilization optimization corresponds to the ecological flow guaranteeing method based on the land utilization optimization.
Fig. 4 is a schematic structural diagram illustrating an eco-traffic securing apparatus optimized based on a land use manner according to an embodiment of the present invention.
As shown in fig. 4, the ecological flow guaranteeing apparatus optimized based on the land use manner includes:
the simulation module 410 is configured to respectively simulate the runoff of a target river in multiple land use planning manners through a preset hydrological model, and obtain simulation results of multiple runoff.
And the calculation module 420 is used for determining the runoff threshold of the target river based on the hydrologic variable deviation degree of the hydrologic change index.
The determining module 430 is configured to determine a first land utilization planning mode capable of guaranteeing the ecological flow according to the simulation results of the plurality of radial flows and the radial flow threshold.
In the embodiment of the invention, the ecological flow guaranteeing device based on the land utilization mode optimization provided by the embodiment of the invention can obtain the simulation result of the runoff rate in each land utilization planning mode by using the preset hydrological model, and performs coupling analysis on the simulation result of the runoff rate in each land utilization planning mode and the runoff rate threshold value to obtain the land utilization planning mode capable of guaranteeing the ecological flow rate, so that the protection strength of the ecological flow rate is improved, and the ecological flow rate is protected more accurately.
In an embodiment of the present invention, the determining module 430 is specifically configured to:
and taking the land utilization planning mode corresponding to the simulation result of the runoff quantity greater than or equal to the runoff quantity threshold value as a first land utilization planning mode.
In one embodiment of the invention, the simulation module 410 includes:
and the first sub-river basin dividing module is used for dividing the sub-river basin of the target river by utilizing a preset hydrological model according to the basic data and the preset water collecting area threshold of the target river under each land utilization planning mode.
And the second division submodule is used for carrying out hydrologic response unit division on the sub-basin according to the preset hydrologic response unit division rule to obtain a runoff simulation result corresponding to each land utilization planning mode. Wherein, predetermine hydrology response unit and divide the rule and include: a minimum soil type area proportion, and a minimum slope proportion of the watershed.
In an embodiment of the present invention, the ecological flow guaranteeing apparatus optimized based on a land use manner further includes:
a determination module to determine a plurality of land use types for the target river based on the land use data for the target river.
And the planning module plans the land utilization types of the target river according to the contribution coefficient of each land utilization type to the radial flow change to obtain a plurality of land utilization planning modes.
In an embodiment of the present invention, the determining module further includes:
and the construction submodule is used for constructing a land utilization change transfer matrix according to the land utilization data of the target river.
The determining submodule is used for determining a plurality of land utilization types through the land utilization transfer matrix, wherein the land transfer amount of each land utilization type is larger than a preset land conversion threshold value.
In an embodiment of the present invention, the ecological flow guaranteeing apparatus optimized based on a land use manner further includes:
and the screening module is used for screening the hydrological model parameters based on the hydrological parameter sensitivity analysis, and taking the hydrological model parameters meeting the preset sensitivity threshold as the model parameters of the initial hydrological model.
And the calibration module is used for calibrating the initial hydrological model based on the model evaluation index to obtain the preset hydrological model.
Each module of the ecological flow guaranteeing device based on land use mode optimization provided by the embodiment of the invention has a function of realizing the ecological flow guaranteeing method/step based on land use mode optimization of the embodiment shown in fig. 1 to 3, and can achieve the technical effect corresponding to the embodiment shown in fig. 1 to 3, and is not described herein again for brevity.
FIG. 5 is a block diagram illustrating an exemplary hardware architecture of a computing device capable of implementing the land-use optimization-based ecological flow assurance method and apparatus according to an embodiment of the present invention.
As shown in fig. 5, computing device 500 includes an input device 501, an input interface 502, a central processor 503, a memory 504, an output interface 505, and an output device 506. The input interface 502, the central processing unit 503, the memory 504, and the output interface 505 are connected to each other through a bus 510, and the input device 501 and the output device 506 are connected to the bus 510 through the input interface 502 and the output interface 505, respectively, and further connected to other components of the computing device 500.
Specifically, the input device 501 receives input information from the outside and transmits the input information to the central processor 503 through the input interface 502; the central processor 503 processes input information based on computer-executable instructions stored in the memory 504 to generate output information, temporarily or permanently stores the output information in the memory 504, and then transmits the output information to the output device 506 through the output interface 505; output device 506 outputs the output information outside of computing device 500 for use by a user.
That is, the computing device shown in fig. 5 may also be implemented as a land use optimization-based ecological flow assurance device, which may include: a memory storing computer-executable instructions; and a processor which, when executing computer executable instructions, may implement the land use optimization-based ecological flow assurance method and apparatus described in conjunction with fig. 1-4.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium has computer program instructions stored thereon; the computer program instructions are executed by a processor to realize the ecological flow guaranteeing method based on land utilization mode optimization provided by the embodiment of the invention.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention. The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (6)

1. An ecological flow guaranteeing method based on land use mode optimization is characterized by comprising the following steps:
respectively simulating the runoff of a target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff;
determining a runoff threshold of the target river based on a hydrologic variable deviation degree of a hydrologic change index;
determining a first land utilization planning mode capable of guaranteeing ecological flow according to the simulation results of the plurality of runoff volumes and the runoff volume threshold;
determining a plurality of land use types for the target river based on the land use data for the target river;
planning the land utilization type of the target river according to the contribution coefficient of each land utilization type to the radial flow change to obtain a plurality of land utilization planning modes;
the determining a plurality of land use types for the target river based on the land use data for the target river comprises:
constructing a land utilization change transfer matrix according to the land utilization data of the target river;
determining a plurality of land use types through the land use transfer matrix, wherein the land transfer amount of each land use type is greater than a preset land conversion threshold value;
through predetermineeing hydrological model, simulate the runoff of target river under the multiple land use planning mode respectively, obtain the simulation result of a plurality of runoff, include:
performing sub-basin division on the target river by utilizing the preset hydrological model according to the basic data and the preset water collecting area threshold of the target river in each land utilization planning mode;
hydrologic response unit division is carried out on the sub-basin by presetting hydrologic response unit division rules to obtain a runoff simulation result corresponding to each land use planning mode, wherein,
the preset hydrologic response unit division rule comprises the following steps:
the area proportion of the minimum land utilization type of the drainage basin, the area proportion of the minimum soil type and the minimum gradient proportion;
through predetermineeing hydrological model, simulate the runoff of target river under the multiple land use planning mode respectively, before obtaining the simulation result of a plurality of runoff, still include:
based on the hydrological parameter sensitivity analysis, the hydrological model parameters are screened, and the hydrological model parameters meeting a preset sensitivity threshold are used as model parameters of an initial hydrological model;
calibrating the initial hydrological model based on a model evaluation index to obtain the preset hydrological model;
the basic data of the target river includes: spatial data and attribute data; the spatial data is: a digital elevation model of the drainage basin, land use type data and soil type data; the attribute data is: meteorological data, soil attribute data, and hydrological data.
2. The ecological traffic guaranteeing method based on land use optimization according to claim 1, wherein the determining a first land use planning method capable of guaranteeing ecological traffic according to the simulation results of the plurality of runoff volumes and the runoff volume threshold comprises:
and taking the land utilization planning mode corresponding to the simulation result of the runoff volume which is greater than or equal to the runoff volume threshold value as a first land utilization planning mode.
3. The ecological traffic guaranteeing method based on land use optimization according to claim 1, wherein the plurality of land use planning means include:
the method comprises an initial land utilization mode, a returning tillage and forest planning mode, an ecological returning tillage planning mode and a basic area planning mode for protecting the arable land.
4. The utility model provides a guarantee device of ecological flow based on land use mode is optimized which characterized in that includes:
the simulation module is used for respectively simulating the runoff of the target river in various land utilization planning modes through a preset hydrological model to obtain simulation results of a plurality of runoff;
the calculation module is used for determining the runoff threshold of the target river based on the hydrologic variable deviation degree of the hydrologic change index;
the determining module is used for determining a first land utilization planning mode capable of ensuring ecological flow according to the simulation results of the plurality of runoff quantities and the runoff quantity threshold;
determining a plurality of land use types for the target river based on the land use data for the target river;
planning the land utilization type of the target river according to the contribution coefficient of each land utilization type to the radial flow change to obtain a plurality of land utilization planning modes;
the determining a plurality of land use types for the target river based on the land use data for the target river comprises:
constructing a land utilization change transfer matrix according to the land utilization data of the target river;
determining a plurality of land use types through the land use transfer matrix, wherein the land transfer amount of each land use type is greater than a preset land conversion threshold value;
through predetermineeing hydrological model, simulate the runoff of target river under the multiple land use planning mode respectively, obtain the simulation result of a plurality of runoff, include:
performing sub-basin division on the target river by utilizing the preset hydrological model according to the basic data and the preset water collecting area threshold of the target river in each land utilization planning mode;
hydrologic response unit division is carried out on the sub-basin by presetting hydrologic response unit division rules to obtain a runoff simulation result corresponding to each land use planning mode, wherein,
the preset hydrologic response unit division rule comprises the following steps:
the area proportion of the minimum land utilization type of the drainage basin, the area proportion of the minimum soil type and the minimum gradient proportion;
through predetermineeing hydrological model, simulate the runoff of target river under the multiple land use planning mode respectively, before obtaining the simulation result of a plurality of runoff, still include:
based on the hydrological parameter sensitivity analysis, the hydrological model parameters are screened, and the hydrological model parameters meeting a preset sensitivity threshold are used as model parameters of an initial hydrological model;
calibrating the initial hydrological model based on a model evaluation index to obtain the preset hydrological model;
the basic data of the target river includes: spatial data and attribute data; the spatial data is: a digital elevation model of the drainage basin, land use type data and soil type data; the attribute data is: meteorological data, soil attribute data, and hydrological data.
5. An ecological flow guaranteeing device based on land use optimization, characterized in that the device comprises: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the ecological flow assurance method based on land use optimization according to any one of claims 1 to 3.
6. A computer storage medium having computer program instructions stored thereon, which when executed by a processor implement the ecological flow assurance method based on land use optimization according to any one of claims 1 to 3.
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