Ecological flow prediction method, system, device and medium based on indicator species

Abstract

The present invention discloses an indicator species-based ecological flow prediction method, system, device, and medium. The method comprises: obtaining river channel data and data on the ecologically sensitive period, species ecological water demand, and species rank of each indicator species, wherein the indicator species include at least plankton, floating organisms, free-living organisms, and benthic organisms, and each category includes at least one indicator species; obtaining the demand priority of the indicator species based on the species rank data; obtaining the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, ecologically sensitive period, and species ecological water demand; determining a calculation function for the ecological flow based on the river channel data; substituting the river ecological water demand into the calculation function to obtain the ecological flow during the ecological flow regulation period. The method can account for the conflicting ecological demands of multiple indicator species, improve flow accuracy, and can be widely applied in the field of ecological flow prediction technology.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological flow prediction, and in particular to an ecological flow prediction method, system, device and medium based on indicator species. Background Art

[0002] For a long time, scientifically determining ecological flow has been an important part of restoring or protecting rivers. In existing technologies, hydrological methods, hydraulic methods, habitat methods and holistic analysis methods are generally used to calculate ecological flow. The hydrological method and hydraulic method do not consider the impact of the ecological needs of indicator species on ecological flow. Although the habitat method and holistic analysis method take into account the ecological needs of indicator species, they fail to resolve the contradictions of the ecological needs of multiple indicator species, and only obtain flow based on the flow velocity and flow curve, and the calculated flow is inaccurate. Summary of the Invention

[0003] In order to solve one of the above problems, the purpose of the present invention is to provide an ecological flow prediction method, system, device and medium based on indicator species, which can integrate the ecological needs of multiple indicator species and improve the accuracy of flow.

[0004] In one aspect, the present invention provides an ecological flow prediction method based on indicator species, comprising the following steps:

[0005] Obtain river channel data and ecologically sensitive periods, species ecological water requirements, and species level data for several indicator species; the types of indicator species include at least plankton, floating organisms, free-living organisms, and benthic organisms, with each type including at least one indicator species;

[0006] Obtaining the demand priority of the indicator species based on the species level data, and obtaining the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, the ecological sensitive period, and the ecological water demand of the species;

[0007] A calculation function for ecological flow is determined based on the river data, and the ecological water demand of the river is substituted into the calculation function to obtain the ecological flow during the ecological flow regulation period.

[0008] Optionally, the indicator species are obtained by the following method:

[0009] obtaining a biological community composed of the plankton and the floating organisms in the river as a common indicator species of the plankton and the floating organisms;

[0010] Acquire the free-living organisms in the river whose species level data is greater than a preset value as the indicator species of the free-living organisms;

[0011] A stable population constructed by benthic organisms in the river is obtained as an indicator species of the benthic organisms.

[0012] Optionally, the species level data includes the endangered level of endangered species and the economic benefit level of economic aquatic species; obtaining the demand priority of the indicator species based on the species level data specifically includes:

[0013] According to the positive correlation between the endangered species' endangerment level and the demand priority, the demand priority of the endangered species is set;

[0014] The demand priority of the economic aquatic species is set according to the positive correlation between the economic benefit level and the demand priority of the economic aquatic species; the demand priority of any endangered species is higher than the demand priority of the economic aquatic species.

[0015] Optionally, obtaining the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period according to the demand priority, the ecological sensitive period, and the species ecological water demand specifically includes:

[0016] The period for calculating ecological flow is divided according to the indicator species and the ecological sensitive period to obtain a number of ecological flow regulation periods;

[0017] The overlapping demands of the ecological water demands of the species in the same ecological flow regulation period are calculated according to the demand priorities, and the overlapping demands are used as the ecological water demands of the river in the same ecological flow regulation period.

[0018] Optionally, the calculation function includes a velocity and flow curve calculation method and an ecological hydraulic radius calculation method; the calculation function for determining the ecological flow based on the river data specifically includes:

[0019] Determining whether a river channel cross-sectional shape change value is greater than a preset value based on the river channel data, and determining whether the river has a flow velocity and flow rate curve based on the river channel data; the river channel cross-sectional shape change value is used to characterize the difference in river channel cross-sectional shape between consecutive river sections;

[0020] If the cross-sectional shape change value of the river is greater than a preset value or the river has no velocity and flow curve, the ecological hydraulic radius calculation method is used as the calculation function;

[0021] If the cross-sectional shape change value of the river channel is less than or equal to a preset value and the river has a velocity and flow curve, the velocity and flow curve calculation method is used as the calculation function.

[0022] Optionally, the river ecological water demand includes a river ecological flow rate demand; substituting the river ecological water demand into the calculation function to obtain the ecological flow during the ecological flow regulation period specifically includes:

[0023] Substituting the river ecological flow rate requirement into the flow rate and flow curve to obtain the ecological flow during the ecological flow regulation period; or

[0024] Determine the cross-sectional area calculation formula based on the cross-sectional shape of the river channel, substitute the river ecological flow velocity requirement into the preset wetted perimeter formula to obtain the cross-sectional wetted perimeter, substitute the cross-sectional wetted perimeter into the cross-sectional area calculation formula to obtain the cross-sectional area, multiply the cross-sectional area and the river ecological flow velocity requirement to obtain the ecological flow during the ecological flow regulation period.

[0025] Optionally, the method further includes determining a control rule, specifically including:

[0026] If the ecological flow of the current ecological flow regulation period overlaps with the ecological flow of the next ecological flow regulation period, the transition between the current ecological flow regulation period and the next ecological flow regulation period will be carried out according to the overlapping interval of the ecological flow;

[0027] If the ecological flow of the current ecological flow regulation period does not overlap with the ecological flow of the next ecological flow regulation period, the transition days are determined, and the transition between the current ecological flow regulation period and the next ecological flow regulation period is carried out according to the transition days.

[0028] On the other hand, the present invention provides an ecological flow prediction system based on indicator species, comprising a first module, a second module and a third module, wherein:

[0029] The first module is used to obtain river channel data and ecological sensitive periods, species ecological water requirements, and species level data of several indicator species; the types of indicator species include at least plankton, floating organisms, free-living organisms, and benthic organisms, and each type includes at least one indicator species;

[0030] The second module is used to obtain the demand priority of the indicator species based on the species level data, and obtain the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, the ecological sensitive period and the ecological water demand of the species;

[0031] The third module is used to determine a calculation function for ecological flow based on the river data, substitute the river ecological water demand into the calculation function, and obtain the ecological flow during the ecological flow regulation period.

[0032] In another aspect, the present invention provides an ecological flow prediction device based on indicator species, comprising:

[0033] at least one processor;

[0034] at least one memory for storing at least one program;

[0035] When the at least one program is executed by the at least one processor, the at least one processor implements any of the above methods.

[0036] In another aspect, the present invention provides a computer-readable storage medium storing a program executable by a processor. When the program is executed by a processor, it is used to perform any of the above methods.

[0037] The implementation of the present invention includes the following beneficial effects: the present invention obtains river channel data and the ecological sensitive period, species ecological water demand and species level data of several indicator species, the types of indicator species include at least plankton, floating organisms, free-swimming organisms and benthic organisms, and each type includes at least one indicator species. According to the species level data, the demand priority of the indicator species is obtained, and according to the demand priority, ecological sensitive period and species ecological water demand, the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period are obtained. By covering multiple types of species with indicator species and using the species level information to comprehensively consider the ecological needs of multiple species, the ecological flow regulation period is divided according to the ecological sensitive periods of multiple species, and the contradictions of the ecological needs of multiple indicator species can be considered; by determining the calculation function of the ecological flow according to the river channel data, substituting the river ecological water demand into the calculation function, the ecological flow during the ecological flow regulation period is obtained, and the flow calculation function is selected according to the state of the river. A single flow velocity and flow curve is not used to calculate the flow, so that the flow can be more in line with the actual situation of the river and the accuracy of the flow is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flowchart of the steps of an ecological flow prediction method based on indicator species provided by the present invention;

[0039] Figure 2 This is a schematic diagram of a river cross-section shape provided by the present invention;

[0040] Figure 3 This is a flowchart of an embodiment of an ecological flow prediction method based on indicator species provided by the present invention;

[0041] Figure 4 It is a curve diagram of ecological flow during the ecological flow regulation period provided by the present invention;

[0042] Figure 5 This is a schematic structural diagram of an ecological flow prediction system based on indicator species provided by the present invention;

[0043] Figure 6 This is a structural schematic diagram of an ecological flow prediction device based on indicator species provided by the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are provided for ease of description only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted based on the understanding of those skilled in the art.

[0045] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms "a," "the," and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0046] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first / S100", "second / S200", "third / S300", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0047] like Figure 1 As shown, Figure 1 The present invention provides a method for predicting ecological flow based on indicator species, which includes the following steps:

[0048] S100. Obtain river channel data and ecologically sensitive periods of several indicator species, species ecological water requirements, and species grade data.

[0049] Among them, the types of indicator species include two or more types of plankton, floating organisms, free-swimming organisms and benthic organisms. It is worth noting that two or more includes this number, and each type includes at least one indicator species.

[0050] It is worth noting that several refers to more than one.

[0051] Ecologically sensitive periods include but are not limited to spawning period, wintering period and feeding period.

[0052] River channel data includes, but is not limited to, river surface elevation, width, historical flow velocity, historical discharge, and hydraulic parameters. Curve fitting based on the water surface elevation and width can yield a fitting curve of the water surface elevation and width, i.e., a parabolic equation for the river's cross-sectional shape. Based on historical flow velocity and discharge, a velocity and discharge curve can be derived.

[0053] Specifically, river channel data and ecological sensitive periods of several indicator species, species ecological water requirements and species level data can be obtained through client input or retrieved from the database. It is worth noting that several means more than two.

[0054] Plankton refers to organisms that live in water and lack the ability to move effectively; floating organisms refer to organisms that live on the surface film of water or attached to the surface film and have weak mobility; free-swimming organisms refer to organisms that can overcome the resistance of water flow and swim freely in water; benthic organisms refer to organisms that live on the bottom of the water.

[0055] S200. Obtain the demand priority of the indicator species according to the species level data, and obtain the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period according to the demand priority, the ecological sensitive period and the ecological water demand of the species.

[0056] Among them, species level data include but are not limited to the endangered level of endangered species and the economic benefit level of economic aquatic species.

[0057] Species ecological water demand includes but is not limited to species ecological flow rate demand and species ecological water level demand, which are the species' requirements for ecological water; river ecological water demand includes but is not limited to river ecological flow rate demand and river ecological water level demand, which are the rivers' requirements for ecological water.

[0058] Specifically, the demand priority of endangered species is set based on the positive correlation between their endangered level and demand priority. The demand priority of economic aquatic species is set based on the positive correlation between their economic benefit level and demand priority. When setting demand priorities, the demand priority of any endangered species shall be higher than the demand priority of economic aquatic species.

[0059] According to the ecological sensitive periods of different indicator species, the period for calculating ecological flow is divided into several ecological flow regulation periods. The species ecological water demands of multiple indicator species in the ecological flow regulation period are calculated according to the demand priority to obtain the river ecological water demand in the ecological flow regulation period.

[0060] S300: Determine a calculation function for ecological flow based on the river data, substitute the ecological water demand of the river into the calculation function, and obtain the ecological flow during the ecological flow regulation period.

[0061] The calculation function includes but is not limited to a flow rate and flow curve calculation method or an ecological hydraulic radius calculation method.

[0062] Specifically, it is determined based on the river data whether the change value of the river channel cross-sectional shape is greater than a preset value, and it is determined based on the river channel data whether the river has a flow velocity and flow curve. The change value of the river channel cross-sectional shape is used to characterize the difference in river channel cross-sectional shape of continuous river sections; if the change value of the river channel cross-sectional shape is greater than the preset value or the river has no flow velocity and flow curve, the ecological hydraulic radius calculation method is used as the calculation function; if the change value of the river channel cross-sectional shape is less than or equal to the preset value and the river has a flow velocity and flow curve, the flow velocity and flow curve calculation method is used as the calculation function.

[0063] In some embodiments, the indicator species in step S100 are obtained by the following method:

[0064] S110. Obtain the biological community composed of plankton and floating organisms in the river as a common indicator species for plankton and floating organisms.

[0065] Specifically, the present invention can obtain data on species and species composition in the river, analyze the composition of plankton and pelagic organisms based on the river species, and use the biomes composed of plankton and pelagic organisms as indicator species for plankton and pelagic organisms. Plankton and pelagic organisms are a source of nutrition for free-living organisms and often occur in communities due to their small size and diversity.

[0066] S120 , obtaining the free-living organisms in the river whose species level data is greater than a preset value as indicator species of the free-living organisms.

[0067] Specifically, the nematodes are primarily fish, marine mammals, and a few cephalopods and crustaceans among the invertebrates. Their survival and reproduction are sensitive to ecological flow. Based on the endangered status of the species in the river, the present invention selects multiple species with endangered status greater than a preset value. Based on the economic benefit level, the present invention selects multiple species with economic benefit levels greater than a preset value as indicator species.

[0068] S130. Obtain stable populations of benthic organisms in rivers as indicator species of benthic organisms.

[0069] Specifically, benthic organisms have higher requirements for ecological water levels than ecological flow. When selecting indicator species, stable populations constructed from benthic animal species are selected as indicator species, and the minimum ecological water level is determined in combination with habitat characteristics.

[0070] In some embodiments, step S200 of obtaining the demand priority of the indicator species based on the species level data specifically includes:

[0071] S210. Set the demand priority of endangered species according to the positive correlation between the endangered level of the endangered species and the demand priority.

[0072] Specifically, the ecological needs priority of endangered species is higher than that of economic aquatic species. When setting the priority, endangered species are divided into three levels: critically endangered, endangered and vulnerable, referring to the endangered category of species. See Table 1. Table 1 is an explanation of the endangered category of indicator species. From critically endangered to vulnerable, the ecological needs priority of endangered species is recorded as IS1, IS2, ..., IS n (n=1,2,…,N), N refers to the number of endangered species.

[0073] Table 1

[0074]

[0075] Among them, the first setting value>the second setting value>the third setting value.

[0076] S220. Set the demand priority of economic aquatic species based on the positive correlation between their economic benefit level and demand priority.

[0077] Among them, the demand priority of any endangered species is higher than the demand priority of economic aquatic species.

[0078] Specifically, according to the economic benefit level of economic aquatic species from high to low, the demand priority of economic aquatic species is recorded as IS n+1 , IS n+2 ,…,IS n+m (m=1,2,…,M), where IS n The last priority of endangered species is that M is the number of economic aquatic species, IS n >IS n+1 .

[0079] In some embodiments, step S200 obtains the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on demand priority, ecological sensitive period, and species ecological water demand, specifically including:

[0080] S230. The same ecologically sensitive periods with the same indicator species shall be divided into the same ecological flow regulation period.

[0081] Specifically, the periods with the same ecological sensitive periods among the indicator species are divided into the same ecological flow regulation period. The entire period for calculating the ecological flow can be divided into multiple time periods, and the ecological sensitive periods of the indicator species included in the time period are determined. If the ecological sensitive periods of the indicator species are the same in two time periods, the two time periods are the same, for example, the same ecological flow regulation period. If the ecological sensitive periods of the indicator species in one time period are different from those in other time periods, the time period is an ecological flow regulation period.

[0082] For example, the entire period for calculating ecological flow is January to December, the ecological sensitive period of species 1 is January to May, the ecological sensitive period of species 2 is February to July, the ecological sensitive period of species 3 is June to August, and the ecological sensitive period of species 4 is January to December. January to February includes an ecological sensitive period of species 1, species 2 and species 4, and January to February are divided into the same ecological flow regulation period; March to May includes the same ecological sensitive period of species 1, species 2, species 3 and species 4, and March to May are divided into the same ecological flow regulation period; June to July includes the same ecological sensitive period of species 2, species 3 and species 4, and June to July are divided into the same ecological flow regulation period; August to December includes the same ecological sensitive period of species 3 and species 4, and August to December are divided into the same ecological flow regulation period.

[0083] S240. Calculate the overlapping ecological water demands of species during the same ecological flow regulation period based on demand priorities, and use the overlapping demands as the river ecological water demands during the ecological flow regulation period.

[0084] Specifically, during an ecological flow regulation period, if the ecological water demands of all indicator species have overlapping parts, the overlapping parts shall be taken as the river ecological water demand during the ecological flow regulation period; if the ecological water demands of indicator species partially overlap, the overlapping parts of the ecological water demands of indicator species with higher demand priority shall be taken as the river ecological water demand; if there is no overlap at all, the ecological water demands of indicator species with higher demand priority shall be taken as the river ecological water demand.

[0085] In steps S210 and S220, the ecologically sensitive period includes the feeding period, the overwintering period and the spawning period. When setting the demand priority, the ecological water demand in the spawning period is greater than that in the feeding period and the overwintering period. Within an ecological flow regulation period, the ecological water demand of species 1 during the feeding period is 0.10-0.55 m / s, and the ecological water demand of species 2 during the spawning period is 0.55-2.3 m / s. The ecological flow rate of 0.55-2.3 m / s is the ecological water demand in the ecological flow regulation period.

[0086] When the ecological flow velocity demand of the optimal indicator species IS1 overlaps with the ecological flow velocity demand of other indicator species, the overlapping interval is taken as the suitable ecological flow velocity range; when the ecological flow velocity demand of the optimal indicator species IS1 does not overlap with other indicator species, the ecological flow velocity of the optimal indicator species is taken as the suitable ecological flow velocity range.

[0087] In some embodiments, the calculation function includes a velocity and flow curve calculation method and an ecological hydraulic radius calculation method; the calculation function for determining the ecological flow according to the river data in step S300 specifically includes:

[0088] S310: Determine whether a change value of a river channel cross-sectional shape is greater than a preset value based on the river channel data, and determine whether the river has a flow velocity and flow rate curve based on the river channel data.

[0089] Among them, the river cross-sectional shape change value is used to characterize the differences in river cross-sectional shapes of continuous river sections.

[0090] Specifically, as in step S300, curve fitting is performed based on the water surface elevation and water surface width to obtain a fitting curve of the water surface elevation and water surface width, that is, a parabolic equation of the river cross-sectional shape. Based on the fitted cross-sectional shape, the change value of the river cross-sectional shape can be determined, and it can be determined whether the change value of the river cross-sectional shape is greater than a preset value.

[0091] A velocity and flow curve can be obtained based on historical flow velocity and historical flow. If the difference between the fitted velocity and flow curve and the actual situation is greater than the preset error, it is confirmed that there is no velocity and flow curve. When the difference between the fitted velocity and flow curve and the actual situation is equal to or less than the preset error, it is confirmed that there is a velocity and flow curve.

[0092] S320a. If the change value of the river section shape is greater than a preset value or the river does not have a velocity and flow curve, the ecological hydraulic radius calculation method is used as the calculation function.

[0093] Specifically, if the change value of the river section shape is greater than the preset value or the river has no velocity and flow curve, it is considered that the river section shape has a greater impact on the flow, and the ecological hydraulic radius calculation method is selected as the calculation function.

[0094] S320b: If the change value of the river channel cross-sectional shape is less than or equal to the preset value and the river has a velocity and flow curve, the velocity and flow curve calculation method is used as the calculation function.

[0095] Specifically, if the change value of the river channel cross-sectional shape is less than or equal to a preset value and the river has a velocity and flow curve, the velocity and flow curve calculation method is used as the calculation function.

[0096] In some embodiments, the river ecological water demand includes the river ecological flow rate demand and the ecological water level demand; step S320 substitutes the river ecological water demand into the calculation function to obtain the ecological flow during the ecological flow regulation period, specifically including:

[0097] S321a. Substitute the river ecological flow velocity demand into the flow velocity and flow curve to obtain the ecological flow during the ecological flow regulation period.

[0098] Specifically, when the calculation function is determined to be the flow velocity and flow curve calculation method, the obtained river ecological flow velocity demand is directly substituted into the flow velocity and flow curve to obtain the ecological flow corresponding to the river ecological flow velocity demand. After obtaining the ecological flow corresponding to the river ecological flow velocity demand, the ecological flow can also be limited according to the ecological water level demand.

[0099] S321b. Determine the cross-sectional area calculation formula based on the cross-sectional shape of the river channel, substitute the river ecological flow velocity demand into the preset wetted perimeter formula to obtain the cross-sectional wetted perimeter, substitute the cross-sectional wetted perimeter into the cross-sectional area calculation formula to obtain the cross-sectional area, multiply the cross-sectional area by the river ecological flow velocity demand to obtain the ecological flow during the ecological flow regulation period.

[0100] Among them, Figure 2 As shown, Figure 2 It is a schematic diagram of the cross-sectional shape of a river channel. The cross-sectional shape of a river channel includes but is not limited to upward and downward types. Figure 2 (a) is upward type, Figure 2 (b) is the downward type.

[0101] In step S100 , hydraulic parameters include but are not limited to hydraulic gradient and river channel roughness.

[0102] Specifically, when the calculation function is determined to be the ecological hydraulic radius calculation method, and the cross-sectional shape of the river channel is upward, its parabolic equation is as shown in formula (1):

[0103] h=a1b 2 (a1>0) (1)

[0104] Where h is the water depth, b is the diffusion coefficient, which is the water width corresponding to the water depth, and a1 is the coefficient of the quadratic term.

[0105] If the cross-sectional shape of the river channel is upward, the cross-sectional area calculation formula is as shown in formula (2):

[0106]

[0107] Where A is the cross-sectional area.

[0108] The preset wetted perimeter formula is shown in formula (3):

[0109]

[0110] Where P is the wetted perimeter.

[0111] Substitute the river ecological flow rate requirement, river channel roughness and hydraulic gradient into the relationship between wetted perimeter, hydraulic radius and cross-sectional area, as shown in formula (4):

[0112]

[0113] Among them, R is the hydraulic radius, v is the river ecological flow velocity requirement, n is the river channel roughness, and J is the hydraulic slope.

[0114] Combining formula (4) and formula (2), the cross-sectional area A can be obtained.

[0115] When the cross-section of the river channel is downward-facing, its parabolic equation is shown in formula (5):

[0116] h=a2|b| 2 +c|b|(a2<0,c>0) (5)

[0117] Where h is the water depth, b is the diffusion coefficient, which is the water width corresponding to the water depth. a² is the coefficient of the quadratic term, and c is the coefficient of the linear term.

[0118] If the cross-sectional shape of the river channel is downward, the cross-sectional area calculation formula is as shown in formula (6):

[0119]

[0120] Among them, A is the cross-sectional area and B is the width of the water-passing section.

[0121] The preset wetted perimeter formula is shown in formula (7):

[0122]

[0123] Where P is the wetted perimeter.

[0124] Substituting the river ecological flow rate requirement, river channel roughness and hydraulic gradient into the relationship between wetted perimeter, hydraulic radius and cross-sectional area, as shown in the above formula (4), and combining formula (4) and formula (5), the cross-sectional area A can be obtained.

[0125] After obtaining the cross-sectional area A, multiply the cross-sectional area by the river ecological flow rate demand to obtain the ecological flow Q during the ecological flow regulation period, as shown in formula (8):

[0126] Q=A·v (8)

[0127] In some embodiments, a method for predicting ecological flow based on indicator species further includes determining a control rule at step S400, specifically including:

[0128] S410a: If the ecological flow in the current ecological flow regulation period overlaps with the ecological flow in the next ecological flow regulation period, a transition is performed between the current ecological flow regulation period and the next ecological flow regulation period according to the overlapping interval of the ecological flow.

[0129] Specifically, when setting the control rules, if the suitable ecological flow ranges of adjacent ecological flow regulation periods overlap, the overlapping intervals are used for smooth transition.

[0130] S420b. If the ecological flow in the current ecological flow regulation period does not overlap with the ecological flow in the next ecological flow regulation period, determine the number of transition days, and perform a transition between the current ecological flow regulation period and the next ecological flow regulation period according to the number of transition days.

[0131] Specifically, if the suitable ecological flow ranges for adjacent ecological flow regulation periods do not overlap, a certain number of days, such as one day, can be reserved in both the current ecological flow regulation period and the next ecological flow regulation period for transition. Transition days can also be reserved separately in either the current ecological flow regulation period or the next ecological flow regulation period.

[0132] like Figure 3 As shown, Figure 3 This is a flowchart of an embodiment of an ecological flow prediction method based on indicator species. The present invention provides a specific embodiment of an ecological flow prediction method based on indicator species, illustrating the specific steps of the present invention:

[0133] In this embodiment, taking a certain river as an example, in step S100, the Elodea community and the phytoplankton community are used as indicator species of plankton and drifting organisms; the silver carp, Chinese spiny barb, white-armored carp, black carp, stickleback fish, common carp, and naked carp of Qinghai Lake are used as indicator species of free-living organisms; and the loach and arthropods and insects are used as indicator species of benthic organisms.

[0134] Figure 3 In the indicator species demand priority stage, the ecological flow rate refers to the species ecological flow rate demand of each indicator species. In the ecological flow regulation period and the ecological demand determination stage, the ecological flow rate range indicated by the green box refers to the river ecological flow rate demand. The ecological flow rate demand of each indicator species is obtained by taking the spawning period as an example during the ecologically sensitive period:

[0135] 1. Plankton and drifting organisms: The river flow velocity throughout the year is greater than 0.14m / s, which has an inhibitory effect on Elodea B1; the river flow velocity throughout the year is greater than 0.50m / s, which has an inhibitory effect on phytoplankton community B2.

[0136] 2. Free-swimming organisms: Silver carp C1: Spawning period from mid-April to late July, species ecological flow velocity requirement 0.10-0.55 m / s; Chinese spiny barb C2: Spawning period from mid-April to late August, species river ecological flow velocity requirement 0.55-2.3 m / s; White snapper C3: Spawning period from mid-April to late June, species river ecological flow velocity requirement 0.57-1.37 m / s; Blackmouth carp C4: Spawning period from early March to June In late April, the species river ecological flow velocity requirement is 0.57~1.37m / s; Clubfish C5: The spawning period is from early April to late June, and the species river ecological flow velocity requirement is 0.3~0.5m / s; Carp C6: The spawning period is from early July to late September, and the species river ecological flow velocity requirement is 0.3~0.6m / s; Qinghai Lake naked carp C7: The spawning period is from early April to late August, and the species river ecological flow velocity requirement is 0~0.8m / s.

[0137] 3. Benthic organisms: Loach D1: The egg-laying period is from early January to late March, and the species requires an ecological water level of 0.3 to 0.5 m; Arthropod species D2 of the class Insecta: The ecological water level requires 0.2 to 0.4 m.

[0138] Demand priority setting: Among the indicator species, naked carp of Qinghai Lake is vulnerable. Based on market economic value, silver carp is 46 yuan / jin (approximately 500 kilograms), Chinese spiny barb is 450 yuan / jin (approximately 500 kilograms), white snapper is 80 yuan / jin (approximately 500 kilograms), black carp is 35 yuan / jin (approximately 500 kilograms), croaker is 40 yuan / jin (approximately 500 kilograms), and common carp is 21 yuan / jin (approximately 500 kilograms). The higher the price, the higher the economic benefit level. Elodea and phytoplankton communities are both key nutrients for the survival and reproduction of aquatic organisms and the main cause of algal blooms. Therefore, their growth needs to be controlled through river flow control. Therefore, the demand priority of indicator species is: naked carp of Qinghai Lake > Chinese spiny barb > white snapper > silver carp > croaker > black carp > common carp > common carp > common carp > common carp. The minimum ecological water level is the upper limit of the ecological water level requirement for loaches and arthropods and insects, which is 0.5 meters. Ecological water level requirements must be greater than or equal to the minimum ecological water level.

[0139] The ecological flow rate requirement, ecological water level requirement and demand priority of each species are determined as shown in Table 2.

[0140]

[0141] Among them, v is suitable for representing the ecological water demand of rivers. The demand priority of indicator species is naked carp of Qinghai Lake > Chinese spiny barb > white snapper > silver carp > stickfish > black carp > carp. For inhibiting algal bloom, phytoplankton community > Elodea.

[0142] According to Table 1, the period for calculating ecological flow should be divided into seven ecological flow regulation periods. The ecological flow velocity requirements for each ecological flow regulation period are as follows: from early January to late February, the ecological flow velocity requirement for the river is >0.5 m / s; from early March to late March, the ecological flow velocity requirement for the river is 0.57-1.37 m / s; from early April to late June, the ecological flow velocity requirement for the river is 0.57-0.8 m / s; from early July to late July, the ecological flow velocity requirement for the river is 0.55-0.8 m / s; from early August to late August, the ecological flow velocity requirement for the river is 0.5-0.8 m / s; from early September to late September, the ecological flow velocity requirement for the river is 0.5-0.6 m / s; and from early October to late December, the ecological flow velocity requirement for the river is >0.5 m / s.

[0143] The calculation of ecological flow velocity takes the downward-type river cross-section as an example. The ecological flow velocity demand of the river in each ecological flow regulation period is substituted into the downward-type calculation function. The river roughness n = 0.04, the hydraulic gradient J = 0.005, and the relationship between the ecological flow velocity demand and the ecological flow is calculated by the downward-type ecological hydraulic radius method: v = 0.003Q 0.626 .

[0144] The ecological water level requirement is greater than or equal to 0.5m. The ecological flow in each ecological flow regulation period in the year (a total of 36 ten-day periods) is as follows: Figure 4 As shown, Figure 4 It is a curve diagram of ecological flow during the ecological flow regulation period. From the figure, we can see that:

[0145] Ecological flow from early January to late February>3542.25m 3 / s; ecological flow from early to late March is 4366.98~17723.98m 3 / s; ecological flow from early April to late June is 4366.98~7504.98m 3 / s; ecological flow from early to late July is 4124.79~7504.98m 3 / s; ecological flow from early to late August is 3542.25~7504.98m 3 / s; ecological flow from early to late September is 3542.25~4739.87m 3 / s; ecological flow from early October to late December>3542.25m 3 / s.

[0146] The implementation of the present invention includes the following beneficial effects: the present invention includes indicator species covering multiple types of species, and uses species level information to comprehensively consider the ecological needs of multiple species, and divides the ecological flow regulation period according to the ecological sensitive periods of multiple species, thereby considering the contradictions of the ecological needs of multiple indicator species; the flow calculation function is selected according to the state of the river, and a single flow velocity and flow curve is not used to calculate the flow, so that the flow can be more in line with the actual situation of the river, thereby improving the accuracy of the flow.

[0147] like Figure 5 As shown, Figure 5 The present invention is a structural diagram of an ecological flow prediction system based on indicator species. The present invention also provides an ecological flow prediction system based on indicator species, including: a first module, a second module and a third module, wherein:

[0148] The first module is used to obtain river channel data and ecological sensitive period, species ecological water demand and species level data of each indicator species; the types of indicator species include at least plankton, floating organisms, free-living organisms and benthic organisms, and each type includes at least one indicator species;

[0149] The second module is used to obtain the demand priority of the indicator species based on the species level data, and obtain the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, the ecological sensitive period and the ecological water demand of the species;

[0150] The third module is used to determine a calculation function for ecological flow based on the river data, substitute the river ecological water demand into the calculation function, and obtain the ecological flow during the ecological flow regulation period.

[0151] Specifically, the first module is used to implement step S100 and its subordinate steps, the second module is used to implement step S200 and its subordinate steps, and the third module is used to implement step S300 and its subordinate steps.

[0152] It can be seen that the contents of the above method embodiments are all applicable to the present system embodiments. The functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0153] like Figure 6 As shown, Figure 6 The present invention further provides a structural diagram of an ecological flow prediction device based on indicator species, comprising:

[0154] at least one processor;

[0155] at least one memory for storing at least one program;

[0156] When the at least one program is executed by the at least one processor, the at least one processor implements the steps of the ecological flow prediction method based on indicator species described in the above method embodiment.

[0157] Among them, the memory is a non-transient computer-readable storage medium that can be used to store non-transient software programs and non-transient computer executable programs. The memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory optionally includes a remote memory remotely arranged relative to the processor, and these remote memories can be connected to the processor via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0158] It can be seen that the contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0159] In addition, the embodiments of the present application further disclose a computer program product or computer program, which is stored in a computer-readable storage medium. The processor of a computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device performs the above-mentioned method. Similarly, the contents of the above-mentioned method embodiment are all applicable to the present storage medium embodiment, and the functions specifically implemented by the present storage medium embodiment are the same as those of the above-mentioned method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned method embodiment.

[0160] The present invention also provides a computer-readable storage medium, which stores a program executable by a processor. The program executable by the processor is used to implement the above method when executed by the processor.

[0161] It is understood that all or some steps, systems in the disclosed method above can be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components can be implemented as software by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those of ordinary skill in the art, the term computer storage medium is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data) and is volatile and non-volatile, removable and non-removable media. Computer storage media includes but is not limited to RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage device, or can be used to store desired information and any other medium that can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0162] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0163] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An ecological flow prediction method based on indicator species, characterized in that: The following steps are involved: Obtain river channel data and ecologically sensitive periods, species ecological water requirements, and species levels of several indicator species; the indicator species include two or more of plankton, floating organisms, free-living organisms, and benthic organisms, with each category including at least one indicator species; Obtaining the demand priority of the indicator species based on the species level data, and obtaining the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, the ecological sensitive period, and the ecological water demand of the species; Determining a calculation function for ecological flow based on the river data, substituting the ecological water demand of the river into the calculation function to obtain the ecological flow during the ecological flow regulation period; The river ecological water demand includes the river ecological flow rate demand; substituting the river ecological water demand into the calculation function to obtain the ecological flow during the ecological flow regulation period specifically includes: Substituting the river ecological flow rate requirement into the flow rate and flow curve to obtain the ecological flow during the ecological flow regulation period; or Determine a cross-sectional area calculation formula based on the cross-sectional shape of the river channel, substitute the river ecological flow velocity requirement into a preset wetted perimeter formula to obtain the cross-sectional wetted perimeter, substitute the cross-sectional wetted perimeter into the cross-sectional area calculation formula to obtain the cross-sectional area, multiply the cross-sectional area by the river ecological flow velocity requirement to obtain the ecological flow during the ecological flow regulation period, wherein the cross-sectional shape of the river channel includes an upward type and a downward type; When the cross-sectional shape of the river channel is upward, the cross-sectional area calculation formula is: Where A is the cross-sectional area, b is the diffusion coefficient, and h is the water depth; When the cross-sectional shape of the river channel is downward, the cross-sectional area calculation formula is: Among them, A is the cross-sectional area, a2 is the quadratic coefficient, B is the water-passing section width, and c is the linear coefficient.

2. The method according to claim 1, characterized in that The indicator species are obtained by the following method: obtaining a biological community composed of the plankton and the floating organisms in the river as a common indicator species of the plankton and the floating organisms; Acquire the free-living organisms in the river whose species level data is greater than a preset value as the indicator species of the free-living organisms; A stable population constructed by benthic organisms in the river is obtained as an indicator species of the benthic organisms.

3. The method according to claim 1, characterized in that The species level data includes the endangered level of endangered species and the economic benefit level of economic aquatic species; the demand priority of the indicator species is obtained based on the species level data, specifically including: According to the positive correlation between the endangered species' endangerment level and the demand priority, the demand priority of the endangered species is set; The demand priority of the economic aquatic species is set according to the positive correlation between the economic benefit level and the demand priority of the economic aquatic species; the demand priority of any endangered species is higher than the demand priority of the economic aquatic species.

4. The method according to claim 1, wherein Obtaining the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period according to the demand priority, the ecological sensitive period, and the species ecological water demand specifically includes: The period for calculating ecological flow is divided according to the indicator species and the ecological sensitive period to obtain a number of ecological flow regulation periods; The overlapping demands of the ecological water demands of the species in the same ecological flow regulation period are calculated according to the demand priorities, and the overlapping demands are used as the ecological water demands of the river in the same ecological flow regulation period.

5. The method according to any one of claims 1 to 4, characterized in that The calculation function includes a velocity and flow curve calculation method and an ecological hydraulic radius calculation method; the calculation function for determining the ecological flow based on the river data specifically includes: Determining whether a river channel cross-sectional shape change value is greater than a preset value based on the river channel data, and determining whether the river has a flow velocity and flow rate curve based on the river channel data; the river channel cross-sectional shape change value is used to characterize the difference in river channel cross-sectional shape between consecutive river sections; If the cross-sectional shape change value of the river is greater than a preset value or the river has no velocity and flow curve, the ecological hydraulic radius calculation method is used as the calculation function; If the cross-sectional shape change value of the river channel is less than or equal to a preset value and the river has a velocity and flow curve, the velocity and flow curve calculation method is used as the calculation function.

6. The method according to any one of claims 1 to 4, characterized in that The method further includes determining a control rule, specifically comprising: If the ecological flow of the current ecological flow regulation period overlaps with the ecological flow of the next ecological flow regulation period, the transition between the current ecological flow regulation period and the next ecological flow regulation period will be carried out according to the overlapping interval of the ecological flow; If the ecological flow of the current ecological flow regulation period does not overlap with the ecological flow of the next ecological flow regulation period, the transition days are determined, and the transition between the current ecological flow regulation period and the next ecological flow regulation period is carried out according to the transition days.

7. An ecological flow prediction system based on indicator species, characterized by: It includes a first module, a second module and a third module, wherein: The first module is used to obtain river channel data and ecological sensitive periods, species ecological water requirements, and species level data of several indicator species; the types of indicator species include two or more of plankton, floating organisms, free-living organisms, and benthic organisms, and each type includes at least one indicator species; The second module is used to obtain the demand priority of the indicator species based on the species level data, and obtain the ecological flow regulation period and the river ecological water demand during the ecological flow regulation period based on the demand priority, the ecological sensitive period and the ecological water demand of the species; The third module is configured to determine a calculation function for ecological flow based on the river data, substitute the river ecological water demand into the calculation function, and obtain the ecological flow during the ecological flow regulation period; The river ecological water demand includes the river ecological flow rate demand; substituting the river ecological water demand into the calculation function to obtain the ecological flow during the ecological flow regulation period specifically includes: Substituting the river ecological flow rate requirement into the flow rate and flow curve to obtain the ecological flow during the ecological flow regulation period; or Determine a cross-sectional area calculation formula based on the cross-sectional shape of the river channel, substitute the river ecological flow velocity requirement into a preset wetted perimeter formula to obtain the cross-sectional wetted perimeter, substitute the cross-sectional wetted perimeter into the cross-sectional area calculation formula to obtain the cross-sectional area, multiply the cross-sectional area by the river ecological flow velocity requirement to obtain the ecological flow during the ecological flow regulation period, wherein the cross-sectional shape of the river channel includes an upward type and a downward type; When the cross-sectional shape of the river channel is upward, the cross-sectional area calculation formula is: Where A is the cross-sectional area, b is the diffusion coefficient, and h is the water depth; When the cross-sectional shape of the river channel is downward, the cross-sectional area calculation formula is: Among them, A is the cross-sectional area, a2 is the quadratic coefficient, B is the water-passing section width, and c is the linear coefficient.

8. An ecological flow prediction device based on indicator species, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a program executable by a processor, characterized in that: The processor-executable program is configured to perform the method according to any one of claims 1 to 6 when executed by the processor.

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