Coastal mud flat suaeda salsa restoration appropriate area evaluation method and system

Abstract

The invention provides a coastal mud flat suaeda salsa restoration suitable area evaluation method and system, and the method comprises the steps: constructing evaluation indexes and suitability grading standards comprising water environment, local vegetation, substrate environment and threat factors, and forming a basic vector pattern spot based on water environment data; assigning scores to the substrate environment data, the local vegetation condition and the threat factor condition, superposing the scores to the basic vector pattern spots, calculating suitability scores of the substrate environment vector pattern spots, the local vegetation vector pattern spots and the threat factor vector pattern spots respectively corresponding to weights, and grading the pattern spots based on the suitability grading standard to obtain a suitability grading result; and combining the pattern spots of the same grade, generating a spatial distribution diagram of the suaeda salsa restoration suitable area, visually dividing a planting area suitable for suaeda salsa, providing a spatial basis for suaeda salsa restoration, and significantly improving the success rate of suaeda salsa restoration.

Description

Technical Field

[0001] The present invention relates to the technical field of Suaeda salsa restoration, and in particular to a method and system for evaluating suitable areas for Suaeda salsa restoration in coastal tidal flats and salt marshes. Background Art

[0002] Coastal wetlands, located at the interface of land and sea, are vulnerable and ecologically sensitive areas, subject to the combined influence of both land and sea. Suaeda salsa, an annual herbaceous plant belonging to the Chenopodiaceae family, is primarily distributed in the intertidal and supratidal zones of the northern coastal areas. As an important salt marsh vegetation in northern China, Suaeda salsa is salt-tolerant and plays a vital role in improving soil structure, regulating nutrient migration, conversion, and absorption, pollution control, carbon sequestration, climate regulation, and flood and drought mitigation. It serves as a key habitat for several bird species and forms a unique ecological landscape, providing valuable ecosystem services.

[0003] Although a lot of work has been done on the degradation mechanism and habitat conditions of coastal salt marsh vegetation in existing technologies, there is no technical method specifically for the evaluation of suitable areas for the restoration of coastal salt marsh tidal flats in specific ecological restoration projects. There is a phenomenon of copying and misappropriation of relevant restoration technologies, and there is a lack of in-depth analysis of the restoration mechanism and regional water environment conditions, bottom conditions and ecological characteristics. The fundamental reason is that the application of salt marsh restoration technology is not integrated and universal enough, and there is little quantitative research on the impact of elevation and hydrodynamics on salt marsh plant growth and customization process, which leads to a disconnect between theoretical research and practical application, the lack of operability of restoration technology, and the failure to effectively improve the restoration effect. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the first object of the present invention is to provide a method for evaluating the suitable area for restoration of Suaeda salsa on coastal tidal flats, comprising: Construct assessment indicators and suitability classification standards for restoration suitable areas, including water environment, native vegetation, bottom environment and threat factors with their respective weights; The primary election proposes to restore the tidal flats; Obtain elevation point cloud data for the proposed tidal flats and historical tide data for the sea area where the proposed tidal flats are located. Establish at least one on-site observation and correction station on the proposed tidal flats. Conduct on-site observations covering two full tide cycles at each of the high, medium, and low tide periods at the on-site observation and correction station. Obtain on-site observation data from the on-site observation and correction station. Use the on-site observation data to correct the historical tide data. Obtain water environment indicators for the proposed tidal flats, including the average daily flooding duration and average flooding depth, to form a basic vector map containing a water environment suitability score. Obtain the bottom sediment environment data, native vegetation status and threat factor status of each basic vector patch respectively. Based on the restoration suitable area assessment index, assign scores to the indexes and superimpose them on the basic vector patch to form the bottom sediment environment vector patch, native vegetation vector patch and threat factor vector patch. Calculate the suitability scores of the substrate environment vector map patches, native vegetation vector map patches, and threat factor vector map patches based on the corresponding weights of the respective evaluation indicators, and grade each map patch based on the suitability grading standard; The same-level patches were merged to generate a spatial distribution map of suitable areas for Suaeda salsa restoration.

[0005] Specifically, the water environment data evaluation method is: Obtain the elevation of the measuring point of the proposed tidal flat, and obtain the historical tide data of the tide station in the sea area where the proposed tidal flat is located, and calculate the tide level data of the proposed tidal flat. , average daily flooding duration and average flooding depth Initial average data of Based on the historical tide gauge data of the tide gauge station, the average daily flooding duration of the on-site observation correction station is calculated Average flooding depth Calculate the average data of Calculate the correction value of the average daily flooding time of the proposed tidal flat based on the calculated average data of the on-site observation correction station and the on-site observation data and average flood depth correction value , correct the initial average data to obtain the average daily flooding time of the proposed restoration beach Average flooding depth water environment data.

[0006] Specifically, the tide data The calculation method is, , in is the historical tide level data of the tide gauge station, is the tide station elevation, is the elevation of the measuring point; The average daily flooding duration The calculation method is, Daily water level of the proposed tidal flat The time period >0 cm was taken as the daily flooding duration, and the daily flooding duration of 12 months was added and averaged to obtain the average daily flooding duration. ; The average flooding depth The calculation method is, The water depth above the elevation of the proposed restoration beach is taken as the flooding depth. The flooding depths of 12 months are summed and averaged to obtain the average flooding depth of the proposed restoration beach. .

[0007] Specifically, the average daily flooding time The calculation method is, , Where, is the corrected value of the daily average flooding time, To correct the daily average flooding duration of the water level gauge at the site during high tide, For on-site observation correction, the average daily flooding duration of the mid-tidal water level gauge at station m is For on-site observation correction, the average daily flooding duration of the water level gauge at station m during neap tide is observed. To estimate the average daily flooding duration; , Where, The average daily flooding duration of the tidal flat to be repaired.

[0008] Specifically, the average flooding depth The calculation method is, , Where, To calibrate the average flooding depth of the water level gauge at the site during high tide, To calibrate the average flood depth of the mid-tidal water level gauge at the site for on-site observation, To calibrate the average flooding depth of the water level gauge at the site during neap tide, To calculate the average flood depth.

[0009] Specifically, the substrate environmental data include the particle size of the restoration area, the total amount of water-soluble salts, and organic carbon data. A substrate environmental survey is carried out on the tidal flat to be restored, and the substrate environmental data is obtained through on-site investigation and experimental analysis.

[0010] Specifically, the native vegetation conditions are obtained by collecting historical data, on-site investigation or remote sensing image recognition to obtain the historical growth conditions of the salt marsh sedge on the tidal flat to be restored.

[0011] Specifically, the threat factors include natural threat factors and man-made threat factors. The natural threat factors include beach erosion, invasion of alien species and sea level rise, and the man-made threat factors include aquaculture, coastal engineering and tourism development.

[0012] Specifically, the weights of the evaluation indicators for the restoration of the coastal tidal flat Suaeda salsa are determined by using the hierarchical analysis method and the expert scoring method, and the indicator scores are quantitatively expressed as follows: , Where, Score the indicator. Assign values ​​to indicators. is the indicator weight; The suitability score is quantitatively expressed as, , Where, For suitability rating, is the total number of indicators.

[0013] The second object of the present invention is to provide a system for evaluating suitable areas for restoration of Suaeda salsa in coastal tidal flats, comprising: A first data acquisition module, the first data acquisition module is used to obtain water environment data, bottom environment data, local vegetation status and threat factor status; A second data acquisition module, the second data acquisition module is used to obtain elevation point cloud data of the tidal flat to be restored; A data processing module is used to obtain water environment data and obtain the average daily flooding time and average flooding depth based on on-site observation, correction site data and historical tide data; A basic vector patch generation module is used to obtain elevation point cloud data of the proposed tidal flat restoration, as well as the average daily flooding time and average flooding depth, and generate basic vector patches using GIS spatial analysis based on preset evaluation indicators and suitability classification standards; A multi-source data overlay module is used to obtain substrate environment data, native vegetation status and threat factor status, and basic vector map patches, assign scores to the substrate environment data, native vegetation status, and threat factor status based on preset evaluation indicators, and overlay them on the basic vector map patches to generate substrate environment vector map patches, native vegetation vector map patches, and threat factor vector map patches; A scoring and grading module is used to obtain substrate environment vector patches, native vegetation vector patches, and threat factor vector patches, calculate the suitability scores of the substrate environment vector patches, native vegetation vector patches, and threat factor vector patches based on the corresponding weights of preset evaluation indicators, and grade each patch based on the suitability grading standard; The patch merging and output module combines patches of the same level to generate a spatial distribution map of suitable areas for restoration of salsa salsa.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses the scatter plot relationship between the number and plant height status data of Salicornia herba and the index data to construct an assessment system that includes water environment, bottom environment, native vegetation, and threat factors, realizing multi-dimensional scientific assessment and significantly improving the success rate of Salicornia herba restoration.

[0015] 2. The present invention uses GIS to generate spatial domains, and uses the water environment suitability score as the basic vector map patch. It superimposes the bottom environment data, native vegetation conditions and threat factor conditions, and merges the same-level maps to generate a spatial distribution map of suitable areas for the restoration of Salicornia herba. It intuitively divides suitable areas, generally suitable areas and unsuitable areas, providing a spatial basis for the restoration of Salicornia herba.

[0016] 3. The water environment data assessment of the present invention obtains the historical tide data of the nearby tide gauge station, and establishes an on-site observation and correction station at the mudflat to be restored. The water level meter is used to conduct on-site observations covering two full rise and fall cycles of high tide, medium tide and low tide. The historical tide data of the tide gauge station is corrected using the on-site observation data, which reduces the deviation of environmental parameters and improves the accuracy of water environment data. The entire assessment cycle only takes half a month. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Flowchart of the present invention; Figure 2 This is a rendering of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. To facilitate understanding of this embodiment, Figure 1 This is a flow chart of a method for evaluating suitable areas for restoration of coastal tidal flat saline land provided in Example 1 of the present invention. The embodiment of the present invention will be described in detail below with reference to this chart.

[0019] The present invention constructs a method and system for evaluating suitable areas for the restoration of Suaeda salsa on coastal tidal flats, with the aim of determining the suitability level for the restoration of Suaeda salsa in the proposed restoration area and its corresponding spatial range. By using the historical native vegetation conditions, average daily flooding duration, average flooding depth, sediment type, total water-soluble salts, organic carbon and threat factor indicators of the proposed restoration tidal flat, the coastal tidal flat Suaeda salsa restoration suitable area assessment system is used to grade the suitable areas for restoration, thereby greatly improving the accuracy of the selection of Suaeda salsa restoration areas, and carrying out targeted restoration through classified measures, providing a way to scientifically guide the restoration of Suaeda salsa.

[0020] Firstly, the fitting relationship between the distribution of Suaeda salsa and environmental variable data was used to construct an assessment index for the suitable area for the restoration of Suaeda salsa on coastal mudflats, which includes 4 primary indicators and 7 secondary indicators. The primary indicators include water environment, native vegetation, bottom environment and threat factors. The secondary indicators include the average daily flooding duration (h / d) and average flooding depth (m) under the water environment indicator, the growth status of Suaeda salsa under the native vegetation, the sediment type, total water-soluble salt (g / kg) and organic carbon (%) under the bottom environment, and whether there are natural or human threat factors under the threat factor.

[0021] Using the scatterplot relationship between the current data on plant number and plant height of Suaeda salsa and the indicator data, we determined the thresholds for each indicator at three levels, assigning values ​​of 5, 3, and 1, respectively. The interpretation and values ​​of the indicators for evaluating the suitability of Suaeda salsa on coastal tidal flats are shown in Table 1.

[0022] Table 1 Definition and value assignment of suitability evaluation indicators for Suaeda salsa on coastal tidal flats

[0023] The analytic hierarchy process and expert scoring method are used to determine the weight of each indicator. The weight values ​​of each evaluation indicator are shown in Table 2.

[0024] Appendix 2 Weights of Suaeda salsa suitability evaluation indicators for coastal tidal flats

[0025] Score each indicator, where the indicator score is quantitatively expressed as: , Where, Score the indicator. Assign values ​​to indicators. is the indicator weight; The suitability score is quantitatively expressed as, , Where, For suitability rating, is the total number of indicators.

[0026] According to the suitability score, the suitability level is divided into suitable, generally suitable and unsuitable. As the preferred grading standard of the present invention, 80 to 100 (inclusive) is suitable, 60 to 80 (inclusive) is generally suitable, and less than or equal to 60 is unsuitable.

[0027] Based on the above suitability evaluation indicators, values ​​and weights, the suitable areas for restoration of Suaeda salsa in coastal tidal flats were evaluated.

[0028] S1: First, preliminarily select the area to be restored, which may be coastal or estuarine mudflats or abandoned aquaculture mudflats.

[0029] S2: Through on-site investigation and combined with the tide level data of the adjacent sea area, obtain the average daily flooding duration and average flooding depth data of the proposed restoration area as the "water environment" indicator data, and form a basic vector map patch, specifically including: S2.1: Use a UAV equipped with a LiDAR to obtain elevation point cloud data of the proposed tidal flat to be restored and convert it to the 1985 National Elevation Datum. The spatial resolution of the point cloud should be no less than 10m.

[0030] S2.2: Collect the historical tide data of the tide stations in the sea area where the tidal flats to be restored are located for the past year If the mudflat to be restored is located in a bay, obtain the historical tide data of the tide station in the bay. If the restoration area is outside the bay, obtain tide data from tide stations within 30 km of the proposed restoration site. Convert the tide data to the 1985 National Height Datum, and superimpose the difference between the tide station elevation and the elevation of the measuring point based on the tide data to obtain the tide level data of each measuring point. .

[0031] Tide level data at each measuring point Calculation formula: , in is the historical tide level data of the tide gauge station, in meters. is the elevation of the tide station, in meters, Elevation of the measuring point, unit: m.

[0032] S2.3: Daily water level The time period with a water level >0 cm is taken as the flooding duration period, and the average daily flooding duration of 12 months is added up to get the average daily flooding duration of the station. The water depth above the mudflat point elevation is taken as the flood depth, and the average of the flood depths for 12 months is added up to get the average flood depth of the station. .

[0033] S2.4: Establish at least one on-site observation correction site m, and use a water level gauge to conduct on-site observations covering two full tide cycles (e.g., 25 hours) during each of the high, medium, and low tide cycles. Obtain the daily average flooding time and average flooding depth data at the on-site observation site, and convert these data into the tidal level data to calculate the daily average flooding time difference and average flooding depth difference, which will be used as the daily average flooding time correction value. and average flood depth correction value .

[0034] Obtain the average daily flooding time of the measuring point by superimposing the initial value and the correction value , average flooding depth The data was used to obtain the correction value of the daily average flooding time at each measuring point based on the threshold interval of the evaluation index for the suitable area for restoration of Suaeda salsa on coastal tidal flats. , average flood depth correction value The two indicators are graded and scored.

[0035] Calculate the average daily flooding time at site observation correction station m and : Using tide gauge data Calculate the tide level data of the on-site observation correction station m , , Correct the daily water level at station m using on-site observations The time period with a value >0 cm is taken as the daily flooding duration. The daily flooding duration of 12 months is summed and averaged to obtain the estimated daily average flooding duration of the field observation correction station m. ; The water depth above the elevation of the on-site observation correction site m is taken as the flooding depth. The flooding depths of 12 months are summed and averaged to obtain the estimated average flooding depth of the on-site observation correction site m. .

[0036] Average daily flooding time at each on-site observation and correction station The calculation method is: , Where, is the correction value of the average daily flooding time, unit is h, The average daily flooding duration of the water level gauge at the site during high tide, in hours, is used for on-site observation correction. The average daily flooding duration of the water level gauge at the tidal period at the field observation correction station m, in hours. The average daily flooding duration of the water level gauge at station m during neap tide is measured in hours. To estimate the average daily flooding duration, unit is h; , Where, The average daily flooding duration of the tidal flat to be restored, unit: h.

[0037] Average flooding depth at each on-site observation and correction station The calculation method is, , Where, The average flooding depth of the water level gauge observed at the site during the high tide period, in meters. The average flooding depth observed by the water level gauge at the mid-tide period of the on-site observation correction station, in meters. The average flooding depth of the water level gauge observed at the site during neap tide, in meters. To estimate the average flooding depth, unit is m.

[0038] S2.5: Use ArcGIS spatial analysis to obtain the daily average flooding time for each level of the map, and use this map as the basic vector map.

[0039] S3: Conduct a bottom sediment survey based on the water environment suitability level plots. In principle, each plot should have at least one survey station. Through field surveys and experimental analysis, obtain data on grain size, total water-soluble salts, and organic carbon in the proposed restoration area. Grain size, total water-soluble salts, and organic carbon are graded for each plot based on the threshold ranges for the assessment of suitable areas for Suaeda salsa restoration in coastal tidal flats.

[0040] S4: Based on the water environment suitability level maps, obtain the historical growth conditions of Salicornia herba in the proposed restoration area through historical data collection, on-site investigation or remote sensing image recognition methods, and use them as the "native vegetation" assessment indicator data to determine its threshold range and further determine its indicator level score.

[0041] S5: Through historical data collection and on-site surveys, obtain the natural threat factors (such as beach erosion, invasion of alien species, sea level rise, etc.) and human threat factors (such as aquaculture, coastal zone projects, tourism development, etc.) in the proposed restoration area, use them as "threat factor" indicator data, determine their threshold range, and further determine their indicator level score.

[0042] S6: Calculate the suitability score corresponding to the basic vector map according to the corresponding weight value of each indicator, and analyze its corresponding suitability level.

[0043] S7: By merging the same-level patches, suitable areas, generally suitable areas and unsuitable areas for the restoration of Suaeda salsa are formed.

[0044] The present invention also provides a coastal tidal flat salt marsh Suaeda restoration suitable area assessment system, including a first data acquisition module, a second data acquisition module, a data processing module, a basic vector map generation module, a multi-source data overlay module, a scoring and grading module, and a map merging and output module.

[0045] The first data acquisition module is used to obtain water environment data, bottom environment data, local vegetation status and threat factor status. The second data acquisition module is used to obtain the elevation point cloud data of the proposed tidal flat restoration. The data processing module is used to obtain water environment data, and obtain the average daily flooding time and average flooding depth based on the on-site observation correction site data and historical tide gauge data. The vector patch generation module is used to obtain the elevation point cloud data of the proposed tidal flat restoration, as well as the average daily flooding time and average flooding depth, and form basic vector patches using GIS spatial analysis based on preset evaluation indicators and suitability classification standards. The multi-source data overlay module is used to obtain bottom environment data, local vegetation status and threat factor status, as well as basic vector patches, and assign scores to the bottom environment data, local vegetation status and threat factor status based on preset evaluation indicators, and overlay them on the basic vector patches to generate bottom environment vector patches, local vegetation vector patches and threat factor vector patches. The scoring and grading module is used to obtain vector maps of the substrate environment, native vegetation, and threat factors, calculate their suitability scores based on the corresponding weights of the preset evaluation indicators, and grade each map based on the suitability grading criteria. The map merging and output module is used to merge maps of the same grade to generate a spatial distribution map of suitable areas for Suaeda salsa restoration.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for evaluating suitable areas for restoration of Suaeda salsa on coastal tidal flats, characterized in that: include: Construct assessment indicators and suitability classification standards for restoration suitable areas, including water environment, native vegetation, bottom environment and threat factors with their respective weights; The primary election proposes to restore the tidal flats; Obtain elevation point cloud data for the proposed tidal flats and historical tide data for the sea area where the proposed tidal flats are located. Establish at least one on-site observation and correction station on the proposed tidal flats. Conduct on-site observations covering two full tide cycles at each of the high, medium, and low tide periods at the on-site observation and correction station. Obtain on-site observation data from the on-site observation and correction station. Use the on-site observation data to correct the historical tide data. Obtain water environment indicators for the proposed tidal flats, including the average daily flooding duration and average flooding depth, to form a basic vector map containing a water environment suitability score. Obtain the bottom sediment environment data, native vegetation status and threat factor status of each basic vector patch respectively. Based on the restoration suitable area assessment index, assign scores to the indexes and superimpose them on the basic vector patch to form the bottom sediment environment vector patch, native vegetation vector patch and threat factor vector patch. Calculate the suitability scores of the substrate environment vector map patches, native vegetation vector map patches, and threat factor vector map patches based on the corresponding weights of the respective evaluation indicators, and grade each map patch based on the suitability grading standard; The same-level patches were merged to generate a spatial distribution map of suitable areas for Suaeda salsa restoration.

2. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 1, wherein: The evaluation method of the water environment data is: Obtain the elevation of the measuring point of the proposed tidal flat, and obtain the historical tide data of the tide station in the sea area where the proposed tidal flat is located, and calculate the tide level data of the proposed tidal flat. , average daily flooding duration and average flooding depth Initial average data of Based on the historical tide gauge data of the tide gauge station, the average daily flooding duration of the on-site observation correction station is calculated Average flooding depth Calculate the average data of Calculate the correction value of the average daily flooding time of the proposed tidal flat based on the calculated average data of the on-site observation correction station and the on-site observation data and average flood depth correction value , correct the initial average data to obtain the average daily flooding time of the proposed restoration beach Average flooding depth water environment data.

3. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 2, wherein: The tide data The calculation method is, ， in is the historical tide level data of the tide gauge station, is the tide station elevation, is the elevation of the measuring point; The average daily flooding duration The calculation method is, Daily water level of the proposed tidal flat The time period >0 cm was taken as the daily flooding duration, and the daily flooding duration of 12 months was added and averaged to obtain the average daily flooding duration. ; The average flooding depth The calculation method is, The water depth above the elevation of the proposed restoration beach is taken as the flooding depth. The flooding depths of 12 months are summed and averaged to obtain the average flooding depth of the proposed restoration beach. .

4. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 2, wherein: The average daily flooding time The calculation method is, ， Where, is the corrected value of the daily average flooding time, To correct the daily average flooding duration of the water level gauge at the site during high tide, For on-site observation correction, the average daily flooding duration of the mid-tidal water level gauge at station m is For on-site observation correction, the average daily flooding duration of the water level gauge at station m during neap tide is observed. To estimate the average daily flooding duration; ， Where, The average daily flooding duration of the tidal flat to be repaired.

5. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 2, wherein: The average flooding depth The calculation method is, ， Where, To calibrate the average flooding depth of the water level gauge at the site during high tide, To calibrate the average flood depth of the mid-tidal water level gauge at the site for on-site observation, To calibrate the average flooding depth of the water level gauge at the site during neap tide, To calculate the average flood depth.

6. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 1, wherein: The substrate environmental data include the particle size of the restoration area, the total amount of water-soluble salts, and organic carbon data. A substrate environmental survey is carried out on the tidal flat to be restored, and the substrate environmental data are obtained through on-site investigation and experimental analysis.

7. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 1, wherein: The native vegetation conditions are obtained by collecting historical data, on-site investigation or remote sensing image recognition to obtain the historical growth conditions of the salt marshland sedge to be restored.

8. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 1, wherein: The threat factors include natural threat factors and man-made threat factors. The natural threat factors include beach erosion, invasion of alien species and sea level rise, and the man-made threat factors include aquaculture, coastal engineering and tourism development.

9. The method for evaluating the suitable area for restoration of Suaeda salsa in coastal tidal flats according to claim 1, wherein: The weights of the evaluation indicators for the restoration of the coastal tidal flat salsa suaeae salsa are determined by the hierarchical analysis method and the expert scoring method. The indicator scores are quantitatively expressed as follows: ， Where, Score the indicator. Assign values ​​to indicators. is the indicator weight; The suitability score is quantitatively expressed as, ， Where, For suitability rating, is the total number of indicators.

10. A system for evaluating suitable areas for restoration of Suaeda salsa on coastal tidal flats, characterized in that: include: A first data acquisition module, the first data acquisition module is used to obtain water environment data, bottom environment data, local vegetation status and threat factor status; A second data acquisition module, the second data acquisition module is used to obtain elevation point cloud data of the tidal flat to be restored; A data processing module is used to obtain water environment data and obtain the average daily flooding time and average flooding depth based on on-site observation, correction site data and historical tide data; A basic vector patch generation module is used to obtain elevation point cloud data of the proposed tidal flat restoration, as well as the average daily flooding time and average flooding depth, and generate basic vector patches using GIS spatial analysis based on preset evaluation indicators and suitability classification standards; A multi-source data overlay module is used to obtain substrate environment data, native vegetation status and threat factor status, and basic vector map patches, assign scores to the substrate environment data, native vegetation status, and threat factor status based on preset evaluation indicators, and overlay them on the basic vector map patches to generate substrate environment vector map patches, native vegetation vector map patches, and threat factor vector map patches; A scoring and grading module is used to obtain substrate environment vector patches, native vegetation vector patches, and threat factor vector patches, calculate the suitability scores of the substrate environment vector patches, native vegetation vector patches, and threat factor vector patches based on the corresponding weights of preset evaluation indicators, and grade each patch based on the suitability grading standard; The patch merging and output module combines patches of the same level to generate a spatial distribution map of suitable areas for restoration of salsa salsa.

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