Methods, equipment, media and products for evaluating the protection effect of nearshore vegetation

Abstract

The present application discloses a method, equipment, medium and product for evaluating the protective effect of nearshore vegetation, and relates to the technical field of vegetation protective effect evaluation. The method comprises: based on vegetation information, sea area hydrodynamic data and sediment data, carrying out a vegetation weak current-impact reduction simulation test to obtain the water flow velocity in front of the vegetation area, the water flow velocity in the rear of the vegetation area, the wave surface process data in front of the vegetation area and the wave surface process data in the rear of the vegetation area; based on vegetation information, sea area hydrodynamic data and sediment data, carrying out a vegetation-non-vegetated bottom bed scour comparison experiment to obtain the scour depth of the vegetation-laid bottom bed and the scour depth of the non-vegetated bottom bed, and then determining the protective effect of the coastal area to be tested. The present application can improve the rationality of the evaluation of the protective effect of nearshore vegetation by carrying out the vegetation weak current-impact reduction simulation test and the vegetation-non-vegetated bottom bed scour comparison experiment.

Description

Technical Field

[0001] The present application relates to the technical field of vegetation protection effect assessment, and in particular to a method, equipment, medium and product for evaluating the effect of nearshore vegetation protection. Background Art

[0002] Tidal flat vegetation is a natural protection method, which is generally believed to have the effects of weakening currents, eliminating waves and reducing scour. In engineering practice, in order to achieve the protection effect of the nearshore, there are often certain requirements for wave height, flow velocity and scour depth, and vegetation parameters such as vegetation type and growth stage have a significant impact on its protection effect. In the early engineering design, the reasonable determination of vegetation-related parameters requires a comprehensive evaluation of the vegetation protection effect. At present, the evaluation method that comprehensively considers the vegetation weakening current, wave elimination and scour reduction effects has not been reported. Summary of the invention

[0003] The purpose of this application is to provide a method, equipment, medium and product for evaluating the protection effect of nearshore vegetation, which can improve the rationality of the evaluation of the protection effect of nearshore vegetation.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a method for evaluating the effect of nearshore vegetation protection, comprising:

[0006] Obtain vegetation information, sea area hydrodynamic data and sediment data of the coastal area to be measured;

[0007] Based on the vegetation information, sea area hydrodynamic data and sediment data, a vegetation weak current-impact reduction simulation test is carried out to obtain the water flow velocity in front of the vegetation area, the water flow velocity behind the vegetation area, the wave surface process data in front of the vegetation area and the wave surface process data behind the vegetation area;

[0008] Based on the vegetation information, sea area hydrodynamic data and sediment data, a comparative experiment of scouring of the bottom bed with vegetation and without vegetation is carried out to obtain the scouring depth of the bottom bed with vegetation and the scouring depth of the bottom bed without vegetation;

[0009] The protective effect of the coastal area to be tested is determined based on the water flow velocity in front of the vegetation area, the water flow velocity behind the vegetation area, the wave surface process data in front of the vegetation area, the wave surface process data behind the vegetation area, the scouring depth of the vegetated bottom bed and the scouring depth of the non-vegetated bottom bed.

[0010] Optionally, the protective effect of the coastal area to be tested is determined according to the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the wave surface process data in front of the vegetation area, the wave surface process data in the back of the vegetation area, the scouring depth of the bottom bed with vegetation and the scouring depth of the bottom bed without vegetation, including:

[0011] Determining a flow velocity attenuation rate according to a water flow velocity before the vegetation area and a water flow velocity after the vegetation area;

[0012] The front wave surface process data of the vegetation area and the rear wave surface process data of the vegetation area are processed respectively by using the upper zero crossing method to obtain the front wave height of the vegetation area and the rear wave height of the vegetation area;

[0013] Determining a wave height attenuation rate according to the wave height before the vegetation area and the wave height after the vegetation area;

[0014] Determining a reduction rate according to the scouring depth of the vegetated bottom bed and the scouring depth of the non-vegetated bottom bed;

[0015] Determining a vegetation protection effect index according to the flow velocity attenuation rate, the wave height attenuation rate and the impact reduction rate;

[0016] Based on the vegetation protection effect index, the protection effect of the coastal area to be tested is determined.

[0017] Optionally, the flow velocity attenuation rate is:

[0018] .

[0019] in, is the flow rate attenuation rate, is the water flow velocity behind the vegetation area, is the water flow velocity in front of the vegetation area.

[0020] Optionally, the wave height attenuation rate is:

[0021] .

[0022] in, is the wave height attenuation rate, is the wave height behind the vegetation area, It is the wave height before the vegetation area.

[0023] Optionally, the shock reduction rate is:

[0024] .

[0025] in, is the reduction rate, To lay the vegetation bed scouring depth, This is the scouring depth of the non-vegetated bottom.

[0026] Optionally, the vegetation protection effect index is:

[0027] .

[0028] in, It is an indicator of vegetation protection effect.

[0029] Optionally, determining the protection effect of the coastal area to be tested based on the vegetation protection effect index includes:

[0030] When the vegetation protection effect index is less than or equal to a preset threshold, determining the coastal area to be tested as a low protection effect coastal area;

[0031] When the vegetation protection effect index is greater than a preset threshold, the coastal area to be tested is determined to be a high protection effect coastal area; and the high protection effect coastal area is an area where engineering projects can be constructed.

[0032] In a second aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-mentioned method for evaluating the effectiveness of nearshore vegetation protection.

[0033] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for evaluating the effectiveness of nearshore vegetation protection.

[0034] In a fourth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the above-mentioned method for evaluating the effectiveness of nearshore vegetation protection.

[0035] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0036] The present application provides a method, equipment, medium and product for evaluating the protective effect of nearshore vegetation, which obtain vegetation information, sea area hydrodynamic data and sediment data of the coastal area to be tested; based on the vegetation information, sea area hydrodynamic data and sediment data, a vegetation weak flow-impact reduction simulation test is carried out to obtain the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the front wave surface process data in the vegetation area and the rear wave surface process data in the vegetation area; based on the vegetation information, sea area hydrodynamic data and sediment data, a vegetation-laid-no-vegetation bottom bed scour comparison experiment is carried out to obtain the scour depth of the vegetated bottom bed and the scour depth of the no-vegetation bottom bed; according to the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the front wave surface process data in the vegetation area, the rear wave surface process data in the vegetation area, the scour depth of the vegetated bottom bed and the scour depth of the no-vegetation bottom bed, the coastal area with high protection effect is determined, thereby laying a foundation for the selection of the engineering area where it can be built. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is an application environment diagram of a method for evaluating the protection effect of nearshore vegetation in one embodiment of the present application;

[0039] Figure 2 This is a schematic diagram of the test arrangement in one embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] like Figure 1 In an exemplary embodiment, a method for evaluating the effect of nearshore vegetation protection includes:

[0044] Step 101: Obtain vegetation information, sea area hydrodynamic data and sediment data of the coastal area to be measured. Obtaining hydrodynamic, sediment and vegetation related data of the actual sea area usually needs to include: multi-year average water level, multi-year average incident wave height, average tidal velocity, and bottom sand particle size. When measured data is missing, hydrodynamic parameters can be calculated by a large-scale water flow-wave numerical model, including but not limited to the TELEMAC-MASCARET model, DELFT3D model and MIKE model.

[0045] Step 102: Based on vegetation information, sea area hydrodynamic data and sediment data, a vegetation weak current-impact reduction simulation test is carried out to obtain the water flow velocity in front of the vegetation area, the water flow velocity behind the vegetation area, the wave surface process data in front of the vegetation area and the wave surface process data behind the vegetation area. Figure 2According to the vegetation type designed for the project and the actual distribution of vegetation on site, the vegetation height and plant density are comprehensively determined. The determination of plant density should be combined with the design plan and the growth density of the vegetation under natural conditions, and the smaller value should be selected comprehensively. According to the actual situation on site and laboratory conditions, the test water level, incident wave height and flow velocity are determined. Usually, the test water level can be selected as the multi-year average water level of the project area, the incident wave height can be selected as the multi-year average wave height of the project area, and the flow velocity is generally selected as the local average tidal flow velocity. Since this test involves the influence of sediment movement and vegetation, there is no systematic similarity study at present. Therefore, within the scope of the capacity of the flume and wave maker, the field hydrodynamic parameters and prototype sand are used as directly as possible to carry out the test. A wave flow flume is used to simulate the effect of vegetation weak flow and impact reduction. Vegetation is laid in the flume according to the selected plant density. In order to ensure that the hydrodynamics are fully developed in the vegetation coverage area, its length usually needs to be selected as 10m or more. The wave height attenuation under the action of the selected test water level and incident wave height and the flow velocity change under the action of the selected test water level and flow velocity are simulated respectively. After the hydrodynamic conditions in the test section reached stability, a flow meter was used to measure the flow velocity before and after the vegetation area. and , using a wave height meter to record the wave surface process before and after the vegetation area and The measured wave surface process is processed by the upper crossing zero point method to obtain the wave height before and after the vegetation area. and . Furthermore, the corresponding flow rate attenuation rate can be calculated , wave height attenuation rate .

[0046] Step 103: Based on vegetation information, sea area hydrodynamic data and sediment data, a comparative experiment on bottom scour between vegetated and non-vegetated beds is carried out to obtain the bottom scour depth of vegetated beds and the bottom scour depth of non-vegetated beds. A wave flow flume is used to simulate the bottom scour conditions with and without vegetation. The bottom bed is laid using prototype sand from the project site, and vegetation is laid in the flume according to the selected vegetation density to simulate the bottom scour conditions under the selected test water level when the flow velocity and downstream waves act together. Correspondingly, the bottom scour conditions without vegetation coverage are simulated under the same water level, wave height and flow velocity. In order to ensure the working effect of the wave maker, the test time should not be too long, and about 30 minutes is appropriate. The bottom scour depth with vegetation coverage is , the bottom scouring depth without vegetation cover is , so the reduction rate can be calculated as .

[0047] Step 104: Determine the protective effect of the coastal area to be tested based on the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the wave surface process data in front of the vegetation area, the wave surface process data in the back of the vegetation area, the scouring depth of the vegetated bottom bed and the scouring depth of the non-vegetated bottom bed.

[0048] Step 104 includes:

[0049] Step 104-1: Determine the velocity attenuation rate according to the velocity of the water flow before the vegetation area and the velocity of the water flow after the vegetation area. The velocity attenuation rate is:

[0050] .

[0051] in, is the flow rate attenuation rate, is the water flow velocity behind the vegetation area, is the water flow velocity in front of the vegetation area.

[0052] Step 104 - 2 : Use the upper zero crossing method to process the front wave surface process data of the vegetation area and the rear wave surface process data of the vegetation area respectively to obtain the front wave height of the vegetation area and the rear wave height of the vegetation area.

[0053] Step 104-3: Determine the wave height attenuation rate based on the wave height before the vegetation area and the wave height after the vegetation area. The wave height attenuation rate is:

[0054] .

[0055] in, is the wave height attenuation rate, is the wave height behind the vegetation area, It is the wave height before the vegetation area.

[0056] Step 104-4: Determine the scouring reduction rate based on the scouring depth of the vegetated substrate and the scouring depth of the non-vegetated substrate. The scouring reduction rate is:

[0057] .

[0058] in, is the reduction rate, To lay the vegetation bed scouring depth, This is the scouring depth of the non-vegetated bottom.

[0059] Step 104-5: Determine the vegetation protection effect index according to the velocity attenuation rate, wave height attenuation rate and impact reduction rate. The vegetation protection effect index is:

[0060] .

[0061] in, It is an indicator of vegetation protection effect.

[0062] Comprehensive flow rate attenuation rate , wave height attenuation rate and the reduction rate , and comprehensively obtain the vegetation protection effect index ,when I When the value is greater than 0.6, it can be considered that the vegetation protection effect of the engineering design is good, and it can comprehensively achieve relatively ideal flow weakening, wave elimination, and impact reduction functions, and is suitable as an actual engineering design scheme.

[0063] Step 104-6: Based on the vegetation protection effect index, determine the protection effect of the coastal area to be tested.

[0064] Specifically, step 104-6 includes:

[0065] Step 104-6-1: When the vegetation protection effect index is less than or equal to the preset threshold, the coastal area to be tested is determined to be a low protection effect coastal area.

[0066] Step 104-6-2: When the vegetation protection effect index is greater than a preset threshold, the coastal area to be tested is determined to be a high protection effect coastal area. The high protection effect coastal area is an area where engineering can be built.

[0067] The hydrodynamic, sediment and vegetation data of the site were obtained through on-site measurements. Combined with the working range of the test flume, the water level selected in the test was 0.30m, the incident wave height was 0.10m, the wave period was 1.6s, the flow velocity was 0.25m / s, the median particle size of the surface sediment on site was 0.025mm, and the bulk density was 1.91g / cm 3 The plant density on site is 12.5 plants / m 2 .

[0068] Vegetation was laid in the water tank according to the actual vegetation coverage rate, waves were generated by a push-plate wave maker, and water flow was transported through a corridor to form a stable flow rate. Before the experiment began, the wave maker and flow device were calibrated.

[0069] To reduce the impact of wave reflection on the test results, vegetation was laid in the middle section of the flume. Wave height meters and current meters were placed before and after the vegetation section to measure the wave surface motion and actual flow velocity. The measured wave surface motion was processed by crossing the zero point to obtain the wave height before and after the vegetation section.

[0070] After 30 minutes of combined action of waves and water flow, the depth of sediment scouring in the soil trough was measured, and the soil trough was refilled with the on-site prototype sand.

[0071] The vegetation in the flume was removed, and the waves and flow velocity were generated again. The wave surface and flow velocity were measured at the same location to obtain the wave height and flow velocity without vegetation cover. Similarly, the sediment scouring depth in the soil flume was measured after 30 minutes of combined action of waves and water flow.

[0072] Calculate the water flow velocity attenuation rate caused by vegetation , incident wave height attenuation rate and scour reduction rate .

[0073] The vegetation protection effect index is obtained by integrating the velocity attenuation rate, wave height attenuation rate and impact reduction rate. I .

[0074] The present application also provides an application scenario, which applies the above-mentioned nearshore vegetation protection effect evaluation method. Specifically: the nearshore vegetation protection effect evaluation method provided in this embodiment can be applied in the coastal engineering construction scenario. The coastal engineering construction scenario includes the coastal engineering design link, the construction area selection link and the coastal engineering construction link; the nearshore vegetation protection effect evaluation method provided in this embodiment belongs to the vegetation protection effect evaluation link in the construction area selection link.

[0075] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for evaluating the protection effect of nearshore vegetation is implemented.

[0076] Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0077] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0078] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0079] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0080] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0081] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0082] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for evaluating the protection effect of nearshore vegetation. It is characterized in that include: Obtain vegetation information, sea area hydrodynamic data and sediment data of the coastal area to be measured; Based on the vegetation information, sea area hydrodynamic data and sediment data, a vegetation weak current-impact reduction simulation test is carried out to obtain the water flow velocity in front of the vegetation area, the water flow velocity behind the vegetation area, the wave surface process data in front of the vegetation area and the wave surface process data behind the vegetation area; Based on the vegetation information, sea area hydrodynamic data and sediment data, a comparative experiment of scouring of the bottom bed with vegetation and without vegetation is carried out to obtain the scouring depth of the bottom bed with vegetation and the scouring depth of the bottom bed without vegetation; Determine the protective effect of the coastal area to be tested based on the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the wave surface process data in front of the vegetation area, the wave surface process data in the back of the vegetation area, the scouring depth of the vegetated bottom bed and the scouring depth of the non-vegetated bottom bed; According to the water flow velocity in front of the vegetation area, the water flow velocity in the back of the vegetation area, the wave surface process data in front of the vegetation area, the wave surface process data in the back of the vegetation area, the scouring depth of the bottom bed with vegetation and the scouring depth of the bottom bed without vegetation, the protection effect of the coastal area to be tested is determined, including: The velocity attenuation rate is determined according to the water flow velocity before the vegetation area and the water flow velocity after the vegetation area; the velocity attenuation rate is: in, is the flow rate attenuation rate, is the water flow velocity behind the vegetation area, is the water flow velocity in front of the vegetation area; The front wave surface process data of the vegetation area and the rear wave surface process data of the vegetation area are processed respectively by using the upper zero crossing method to obtain the front wave height of the vegetation area and the rear wave height of the vegetation area; The wave height attenuation rate is determined according to the wave height before the vegetation area and the wave height after the vegetation area; the wave height attenuation rate is: in, is the wave height attenuation rate, is the wave height behind the vegetation area, is the wave height before the vegetation area; The reduction rate is determined according to the scouring depth of the vegetation-covered bottom bed and the scouring depth of the non-vegetated bottom bed; the reduction rate is: ； in, is the reduction rate, To lay the vegetation bed, the scouring depth is It is the scouring depth of the non-vegetated bottom bed; According to the velocity attenuation rate, the wave height attenuation rate and the impact reduction rate, a vegetation protection effect index is determined; the vegetation protection effect index is: in, It is an indicator of vegetation protection effect; Determining the protection effect of the coastal area to be tested based on the vegetation protection effect index; Determining the protection effect of the coastal area to be tested based on the vegetation protection effect index includes: When the vegetation protection effect index is less than or equal to a preset threshold, determining the coastal area to be tested as a low protection effect coastal area; When the vegetation protection effect index is greater than a preset threshold, the coastal area to be tested is determined to be a high protection effect coastal area; and the high protection effect coastal area is an area where engineering projects can be constructed.

2. A computer device, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for evaluating the effectiveness of nearshore vegetation protection as described in claim 1.

3. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the method for evaluating the effect of nearshore vegetation protection described in claim 1 is implemented.

4. A computer program product comprising a computer program, It is characterized in that When the computer program is executed by a processor, the method for evaluating the effect of nearshore vegetation protection described in claim 1 is implemented.

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