CN111401736B - River longitudinal connectivity evaluation method and device - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for evaluating the longitudinal connectivity of a river, wherein the method comprises the following steps: determining the blocking coefficient of each blocking object of the target river; determining a first position correction factor of each barrier according to a first distance between each barrier and a target river source and a second distance between each barrier and a target river mouth; then determining a second position correction factor of each barrier according to the first multi-year average natural runoff of the position of each barrier and the second multi-year average natural runoff of the estuary or afflux part of the target river; and finally, determining the position correction factor of each barrier according to the first position correction factor and the second position correction factor of each barrier, determining the longitudinal connectivity index of the target river according to the position correction factor, the barrier factor and the length of the target river of each barrier, and obtaining the longitudinal connectivity index of the river, which can reflect the longitudinal connectivity of the river better, so that the accuracy of evaluating the longitudinal connectivity of the river is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of water environment evaluation, in particular to a method and a device for evaluating the longitudinal connectivity of a river.
Background
The river water system connectivity has the functions of hydrologic regulation and storage, ensuring smooth migration of organisms, improving water and soil environments and the like, and the connectivity mechanism mainly shows the continuity of longitudinal, transverse, vertical and time dimensions. River longitudinal connectivity has important effects on fish distribution, population structure, reproductive success, and spread of many species. A series of problems of water ecology, water environment and water safety caused by the obstruction of longitudinal connectivity severely restrict the sustainable development of regional economy and society. The river longitudinal connectivity evaluation has important significance for building structures such as gate dams and the like, building positions of the buildings and the like.
River longitudinal connectivity is affected by the length of the communicating river segment and the degree of obstruction: the longer the length of the communicated river reach is, the more environment required by the survival of fishes can be met, and the more beneficial the survival of aquatic organisms such as the fishes and the like is; secondly, different river-blocking buildings have different blocking time and degrees on river channels, and the smaller the blocking degree is, the more beneficial the migration and migration of fishes are. At present, the longitudinal connectivity of a river is evaluated by mainly adopting a barrier coefficient method to calculate the longitudinal connectivity index of the river in the prior art. Wherein, the longitudinal connectivity index is calculated according to the quantity, the type and the barrier coefficient of barriers such as barrages.
However, the inventor finds that the existing method for calculating the longitudinal connectivity of the river by the barrier coefficient method at least has the following technical problems: due to the fact that barriers such as barrages are different in position, influences of the barriers on the longitudinal connectivity of the river are different, but the longitudinal connectivity of the river with the different barriers in position calculated by the existing barrier coefficient method is not different, and the longitudinal connectivity of the river cannot be accurately evaluated.
Disclosure of Invention
The embodiment of the invention provides a method and a device for evaluating the longitudinal connectivity of a river, which aim to solve the problems that the longitudinal connectivity of rivers with different barrier positions calculated by the existing barrier coefficient method is not different and the longitudinal connectivity of the rivers cannot be accurately evaluated.
In a first aspect, an embodiment of the present invention provides a method for evaluating river longitudinal connectivity, including:
determining the blocking coefficient of each blocking object of the target river;
determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river;
determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary or afflux position of the target river;
determining a position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier;
and determining the longitudinal communication index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river.
In one possible design, after determining the longitudinal communication index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river, the method further includes:
and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity level of the target river.
In one possible design, the determining a blocking coefficient for each barrier of the target river comprises:
and determining the blocking coefficient of each blocking object of the target river according to the type of each blocking object.
In one possible design, the determining a first position correction factor for each barrier based on a first distance of each barrier from the source of the target river and a second distance of each barrier from the mouth of the target river comprises:
first distance L of each barrier from the source of the target riveraiAnd a second distance L between each barrier and the river mouth of the target riverbiThe first bit of each barrier is calculated by introducing the following formulaSetting a correction factor bLi：
In the formula, LaiIs a first distance; l is a radical of an alcoholbiIs a second distance; l isjIs the target river length; alpha is the first normalization coefficient, i is the ith barrier, and j is the jth entry target river.
In one possible design, the determining the second position correction factor for each barrier according to the first multi-year average natural runoff at the position of each barrier and the second multi-year average natural runoff at the estuary or afflux of the target river comprises:
the average natural runoff for the first plurality of years and the average natural runoff for the second plurality of years are introduced into the following formula, and a second position correction factor b of each barrier is calculatedQi：
In the formula, QiIs the first perennial average natural runoff; qjThe average natural runoff for the second plurality of years; β is a second normalization coefficient.
In one possible design, the determining a position correction factor for each barrier according to the first position correction factor and the second position correction factor for each barrier includes:
and leading the first position correction factor and the second position correction factor into the following formula, and calculating to obtain the position correction coefficient b of each barrieri：
bi＝(bLi+bQi)/2
In the formula, bLiThe first position correction factor is a position correction factor for representing the influence of the position of the barrier on the longitudinal connectivity of the target river; bQiIs a second position correction factor, which is characteristic of the position of the blocking object to the target river and riverLocation correction factors for the effect of connectivity between incoming mains flows.
In one possible design, the determining the longitudinal communication index of the target river according to the position correction coefficient of each barrier, the barrier coefficient and the length of the target river comprises:
guiding the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river into the following formula, and calculating to obtain the longitudinal communication index C of the target riverj：
In the formula, aiThe barrier coefficient of each barrier; biCorrecting the coefficient for the position of each barrier; l isjIs the length of the jth segment of the target river.
In a second aspect, an embodiment of the present invention provides a river longitudinal connectivity evaluation apparatus, including:
the parameter processing unit is used for determining the blocking coefficient of each blocking object of the target river; determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river; determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary or afflux position of the target river; determining a position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier;
and the connectivity evaluation unit is used for determining the longitudinal connectivity index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river, and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity grade of the target river.
In a possible design, the parameter processing unit is specifically used forThe parameter processing unit is specifically used for separating each barrier from the first distance L of the target river sourceaiAnd a second distance L from each barrier to the river mouth of the target riverbiThe following formula is introduced, and the first position correction factor b of each barrier is calculatedLi：
In the formula, bLiIs a first position correction factor; l isaiIs a first distance; l isbiIs a second distance; l isjIs the target river length; alpha is the first normalization coefficient, i is the ith barrier, and j is the jth entry target river.
In one possible design, the parameter processing unit is specifically configured to introduce the first-year average natural runoff and the second-year average natural runoff into the following formula, and calculate the second position correction factor b of each barrierQi：
In the formula, QiIs the first years average natural runoff; qjThe average natural runoff for the second plurality of years; β is a second normalization coefficient.
According to the method and the device for evaluating the river longitudinal connectivity, first position correction factors of barriers are determined according to first distances from the barriers to a target river source and second distances from the barriers to a target river mouth; then determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary of the target river or the position of the afflux main stream; and finally, determining the position correction factor of each barrier according to the first position correction factor and the second position correction factor of each barrier, and determining the longitudinal communication index of the target river according to the position correction factor, the barrier factor and the length of the target river of each barrier. Due to the fact that different position information of the blocking object in the target river is considered, the obtained longitudinal connectivity index can reflect the longitudinal connectivity of the river, and accuracy of evaluation of the longitudinal connectivity of the river is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic flow chart of a river longitudinal connectivity evaluation method provided by an embodiment of the present invention;
fig. 2 is a schematic flow chart of a river longitudinal connectivity evaluation method provided by the embodiment of the invention;
fig. 3 is a block diagram of a structure of a river longitudinal connectivity evaluation apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a hardware structure of a river longitudinal connectivity evaluation device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the existing method for calculating the longitudinal connectivity of a river by using a barrier coefficient method is mainly obtained by calculation according to the number, the type and the barrier coefficient of barriers. However, the barriers such as barrages have different influences on the longitudinal connectivity of the river due to different positions of the barriers, but the longitudinal connectivity of the river with different positions of the barriers calculated by the existing barrier coefficient method is not different, and the longitudinal connectivity of the river cannot be accurately evaluated.
In order to solve the above technical problem, the embodiment of the present invention provides the following solutions: when the longitudinal connectivity of the river is calculated, not only the blocking coefficient of the blocking object is considered, but also the position information of the blocking object in the target river is considered (namely, the influence of the blocking object position on the longitudinal connectivity of the current river and the influence of the blocking object position on the connectivity between the target river and the inflowing main stream are comprehensively considered), and the river longitudinal connectivity index calculated according to the position correction coefficient of each blocking object is more accurate and can reflect the real longitudinal connectivity of the river.
Referring to fig. 1, fig. 1 is a first schematic flow chart of a method for evaluating longitudinal connectivity according to an embodiment of the present invention. The evaluation method is described in detail below:
s101: the blocking coefficient of each barrier of the target river is determined.
In this embodiment, each barrier of the target river may be a single value, or may be a corresponding barrier coefficient determined according to the type of the barrier.
The barriers are river barrage structures in rivers and the types of barriers include, but are not limited to, reservoirs, hydroelectric power stations, gates, barrages (rubber dams), and the like. For example, if the blocking object is a barrage, the blocking coefficient can be set according to the existence of fish passing facilities of the barrage. If the barrier is a reservoir, the barrier coefficient can be set according to whether the barrier is completely blocked, whether fish passing facilities exist, whether a ship lock exists or not and the like.
Referring to table 1, table 1 shows barrier coefficient values corresponding to each type of barrier.
TABLE 1 values of barrier coefficient corresponding to each type of barrier
S102: and determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river.
Specifically, the first distance L of each barrier from the source of the target riveraiAnd a second distance L from each barrier to the river mouth of the target riverbiThe following formula (1) is introduced, and the first position correction factor b of each barrier is calculatedLi：
In the formula, LaiIs a first distance; l isbiIs a second distance; l isjIs the length of the target river; alpha is the first normalization coefficient, i is the ith barrier, and j is the jth entry target river.
In a specific example, a certain target river can be selected in the ArcGIS software, a "segmentation tool" in the ArcGIS is used to segment the line image layer where the target river is located through the position where the barrier is located, and the length of the target river, in units of Km, is calculated through the "geometric calculation" in the attribute table.
The length of the corresponding river reach can be calculated in Excel through accumulation, the length of each barrier in the target river from the source of the target river is obtained through calculation, and the length is the first distance LaiAnd a second distance L between each barrier and the river mouth (or the next stage of main stream) of the target riverbi。
S103: determining a second position correction factor for each barrier based on the first perennial average natural runoff at the location of each barrier and the second perennial average natural runoff at the estuary or afflux of the target river.
Specifically, the first-year average natural runoff and the second-year average natural runoff are introduced into the following formula (2), and the second position correction factor b of each barrier is calculatedQi：
In the formula, QiIs the first years average natural runoff; qjThe average natural runoff for the second plurality of years; β is a second normalization coefficient.
Wherein the mean natural flux (Q) over many years at the barrier is determined by reference to the datai) And determining the average natural runoff (Q) of the river mouth (or the position of the river mouth merging into the main stream) of the river section for many yearsj)。
S104: and determining the position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier.
Specifically, the first position correction factor and the second position correction factor are introduced into the following formula (3), and the position correction coefficient b of each barrier is calculatedi：
bi＝(bLi+bQi)/2
In the formula, bLiIs a first position correction factor; bQiIs the second position correction factor.
S105: and determining the longitudinal communication index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river.
Introducing the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river into the following formula, and calculating to obtain the longitudinal communication index C of the target riverj：
In the formula, aiThe barrier coefficient of the ith barrier; biThe position correction coefficient of the ith barrier is obtained; l isjIs the length of the target river.
As can be seen from the above description, in the embodiment, first, the first position correction factor of each barrier is determined according to the first distance from each barrier to the source of the target river and the second distance from each barrier to the river mouth of the target river; then determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary of the target river or the position of the afflux main stream; and finally, determining the position correction factor of each barrier according to the first position correction factor and the second position correction factor of each barrier, and determining the longitudinal communication index of the target river according to the position correction factor and the barrier factor of each barrier and the length of the target river of the river. Due to the fact that different position information of the blocking object in the target river is considered, the obtained river longitudinal connectivity index can reflect the longitudinal connectivity of the river, and accuracy of river longitudinal connectivity evaluation is improved.
Referring to fig. 2, fig. 2 is a schematic flow chart of a river longitudinal connectivity evaluation method provided by the embodiment of the invention. The process of evaluating the longitudinal connectivity level of the river is also included after the step S105, and is detailed as follows:
s106: and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity grade of the target river.
In this embodiment, the set standard may be set as required, or may be a fixed classification standard in the industry. Referring to table 2, table 2 shows the evaluation criteria for river longitudinal connectivity.
TABLE 2 evaluation criteria for river longitudinal connectivity
As can be seen from the above description, by performing a hierarchical evaluation on the longitudinal connectivity of a river, the longitudinal connectivity of the river can be reflected in a more intuitive manner.
The method for evaluating the river longitudinal connectivity according to this embodiment is described below with reference to a specific application example.
Taking the Yangtze river drainage basin as an example, the area of the drainage basin is more than 10000km as an evaluation object2The river of (4) is evaluated for the connectivity of 45 rivers in the Yangtze river basin. The type of the barrier is considered to be large and medium-sized reservoirs and above (the total storage capacity is more than 1000 ten thousand cubic meters), and the type (I) of the small hydropower station and above (the installed capacity is more than 10000KW) are considered to be small hydropower stations.
According to the step evaluation of the embodiment of the river longitudinal connectivity evaluation method, the longitudinal connectivity evaluation level of each river is determined.
The results show that: the average river longitudinal connectivity index in the Yangtze river region is 1.53, and the overall evaluation result is poor. The river basin area is more than 45 rivers of 10000km2, wherein the evaluation result is that the number of the rivers is preferably 8 (accounting for 17.78%), and the rivers are respectively bouqu, red water river, Chumarl river, Danqu, Yangtze river, fresh water river, Toaska river and Binhe river. The evaluation results were 2 good (4.44%) as water in Sihan and Yazhenjiang. The evaluation results are 4 (8.89%) of the three, namely the pond river, the xu qu, the Hanjiang river and the Tang Baihe. The evaluation results are 9 poor (accounting for 20%) respectively for the Danjiang river, the Ganjiang river, the Xilu river, the Fu river, the Gangjiang river, the Min river, the Qu river, the Chang river and the Wujiang river. The evaluation result was inferior to 22 (48.89%). Respectively Anning river, Bailongjiang, Fujiang, Jialing river and \28583water, Yangjiang, cowbang river, common river, Tuo river, Xiangjiang, Xinjiang, Xishui river, unitary water, river, Zishui river, Qingyi river, Qingjiang, Yangzhou river, dance water, Rishui water, Leishi water and river blockage.
Fig. 3 is a block diagram of a structure of a river longitudinal connectivity evaluation device according to an embodiment of the present invention, which corresponds to the river longitudinal connectivity evaluation method according to the above embodiment. For convenience of explanation, only portions related to the embodiments of the present invention are shown.
Referring to fig. 3, the river longitudinal connectivity evaluation apparatus 30 includes: a parameter processing unit 301 and a connectivity evaluation unit 302.
The parameter processing unit 301 is configured to determine a blocking coefficient of each blocking object of the target river; determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river; determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary or afflux position of the target river; determining a position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier;
and the connectivity evaluation unit 302 is used for determining the longitudinal connectivity index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river, and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity grade of the target river.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
In one possible design, the parameter processing unit 301 is specifically configured for the parameter processing unit, specifically for the first distance L of each barrier from the source of the target riveraiAnd a second distance L between each barrier and the river mouth of the target riverbiThe following formula is introduced, and the first position correction factor b of each barrier is calculatedLi：
In the formula, bLiIs a first position correction factor; l isaiIs a first distance; l isbiIs a second distance; l isjIs the target river length; alpha is the first normalization coefficient, i is the ith barrier, and j is the jth entry target river.
In one possible design, the parameter processing unit 301 is specifically configured to introduce the first-year average natural runoff and the second-year average natural runoff into the following formula, and calculate the second position correction factor b of each barrierQi：
In the formula, QiIs the first years average natural runoff; qjThe average natural runoff for the second plurality of years; beta is secondAnd (4) normalizing the coefficients.
Referring to fig. 4, fig. 4 is a schematic diagram of a hardware structure of a river longitudinal connectivity evaluation apparatus according to an embodiment of the present invention. As shown in fig. 4, the river longitudinal connectivity evaluation apparatus 40 of the present embodiment includes: a processor 401 and a memory 402; wherein the content of the first and second substances,
a memory 402 for storing computer-executable instructions;
the processor 401 is configured to execute the computer-executable instructions stored in the memory to implement the steps performed by the terminal device in the foregoing embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 402 may be separate or integrated with the processor 401.
When the memory 402 is provided separately, the river longitudinal connectivity evaluating apparatus further includes a bus 403 for connecting the memory 402 and the processor 401.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer execution instructions, and when a processor executes the computer execution instructions, the method for evaluating river longitudinal connectivity is implemented as described above.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the disclosure may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for evaluating the longitudinal connectivity of a river is characterized by comprising the following steps:
determining the blocking coefficient of each blocking object of the target river;
determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river;
determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary or afflux position of the target river;
determining a position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier;
determining the longitudinal communication index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river;
determining a first position correction factor of each barrier according to a first distance from each barrier to the target river source and a second distance from each barrier to the target river estuary, wherein the determining the first position correction factor comprises the following steps:
first distance L of each barrier from the source of the target riveraiAnd a second distance L between each barrier and the river mouth of the target riverbiThe following formula is introduced, and the first position correction factor b of each barrier is calculatedLi：
In the formula, LaiIs a first distance; l isbiIs a second distance; l is a radical of an alcoholjIs the length of the target river; alpha is a first normalization coefficient, i is the ith barrier, and j is the jth entry target river;
determining a second position correction factor of each barrier according to the first multi-year average natural runoff at the position of each barrier and the second multi-year average natural runoff at the estuary or afflux main stream of the target river, including:
the average natural runoff for the first plurality of years and the average natural runoff for the second plurality of years are introduced into the following formula, and a second position correction factor b of each barrier is calculatedQi：
In the formula, QiIs the first years average natural runoff; qjThe average natural runoff for the second plurality of years; β is a second normalization coefficient.
2. The method of claim 1, wherein after determining the longitudinal connectivity index of the target river based on the position correction factor, the blocking factor, and the length of the target river for each of the barriers, further comprising:
and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity level of the target river.
3. The method of claim 1, wherein determining the blockage factor for each blockage of the target river comprises:
and determining the blocking coefficient of each blocking object of the target river according to the type of each blocking object.
4. The method of claim 1, wherein determining a position correction factor for each barrier as a function of the first and second position correction factors for each barrier comprises:
and leading the first position correction factor and the second position correction factor into the following formula, and calculating to obtain the position correction coefficient b of each barrieri：
bi＝(bLi+bQi)/2
In the formula, bLiThe first position correction factor is a position correction factor for representing the influence of the position of the barrier on the longitudinal connectivity of the target river; bQiIs a second position correction factor, is a position correction factor that characterizes the effect of the barrier position on the connectivity between the target river and the incoming main stream.
5. The method of claim 1, wherein determining the longitudinal connectivity index of the target river based on the position correction factor, the blockage factor, and the length of the target river for each blockage comprises:
introducing the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river into the following formula, and calculating to obtain the longitudinal communication index C of the target riverj：
In the formula, aiThe barrier coefficient of each barrier; biCorrecting the coefficient for the position of each barrier; l isjThe length of the river is labeled for the j-th entry.
6. A river longitudinal connectivity evaluation device, characterized by comprising:
the parameter processing unit is used for determining the blocking coefficient of each blocking object of the target river; determining a first position correction factor of each barrier according to a first distance between each barrier and the source of the target river and a second distance between each barrier and the river mouth of the target river; determining a second position correction factor of each barrier according to the first perennial average natural runoff of the position of each barrier and the second perennial average natural runoff of the estuary or afflux position of the target river; determining a position correction coefficient of each barrier according to the first position correction factor and the second position correction factor of each barrier;
the connectivity evaluation unit is used for determining the longitudinal connectivity index of the target river according to the position correction coefficient and the blocking coefficient of each blocking object and the length of the target river, and comparing the longitudinal connectivity index of the target river with a set standard to determine the longitudinal connectivity grade of the target river;
the parameter processing unit is specifically used for processing the first distance L of each barrier from the source of the target riveraiAnd a second distance L between each barrier and the river mouth of the target riverbiThe following formula is introduced, and the first position correction factor b of each barrier is calculatedLi：
In the formula, bLiIs a first position correction factor; l isaiIs a first distance; l isbiIs a second distance; l isjIs the target river length; alpha is a first normalization coefficient, i is the ith barrier, and j is the jth entry target river;
the parameter processing unit is specifically configured to introduce the first-year average natural runoff and the second-year average natural runoff into the following formula, and calculate the second position correction factor b of each barrierQi：
In the formula, QiIs the first years average natural runoff; qjThe average natural runoff for the second plurality of years; β is a second normalization coefficient.
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