CN110759480B - Functional wetland restoration construction method - Google Patents
Functional wetland restoration construction method Download PDFInfo
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- CN110759480B CN110759480B CN201911063392.5A CN201911063392A CN110759480B CN 110759480 B CN110759480 B CN 110759480B CN 201911063392 A CN201911063392 A CN 201911063392A CN 110759480 B CN110759480 B CN 110759480B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Abstract
The invention discloses a functional wetland restoration construction method, which comprises the following steps: establishing a regional hydrological model, establishing a regional site pollution load model, establishing a total pollution load boundary model, confirming boundary conditions and recovering a construction scheme; the wetland restoration construction method has the beneficial effects that the hydrological model and the site pollution load model are combined to obtain a pollution total load boundary model, the optimal water quality or the maximum wetland restoration construction area is used as a boundary condition, the multi-target benefit of the wetland area is researched, and the multi-target benefit is used as a reference for engineering construction, so that the rationality of the wetland restoration engineering can be improved; the wetland restoration construction method of the invention takes the grid close to the river as a drainage grid, simplifies the construction of the site pollution load model, focuses the wetland restoration construction on the offshore wetland area on one hand, and emphasizes the wetland area which is away from the river within a certain distance range on the other hand.
Description
Technical Field
The invention relates to the technical field of wetland construction, in particular to a functional wetland restoration construction method.
Background
Researches show that the functional wetland can reduce 99% of nitrogen, 75% of phosphorus and a large amount of pollutants in the polluted water body. However, with the rapid development of social economy, the pollution problem of functional wetland water resources in China is more and more serious. At present, the main functional wet land recovery methods in China are agricultural activity stop, drainage concealed pipe removal, drainage channel filling, flood control project removal and the like, and the functional wet land can realize self recovery after a period of natural growth. However, the above-mentioned approaches do not take into account the coupling of the hydrological process with the land use upstream and downstream, since the runoff discharged from the polluted region upstream must be discharged into the restored wetland, rather than into the wetland water body through the concealed pipes or trenches.
Disclosure of Invention
1. Objects of the invention
The purpose of the invention is as follows: the functional wetland restoration construction method is provided, hydrologic simulation and extraction utilization planning are combined with production practice, and the restoration construction of the functional wetland is scientifically planned.
2. Technical scheme
In order to achieve the purpose, the technical scheme of the invention is as follows: a functional wetland restoration construction method comprises the following steps:
step 1, establishing a regional hydrological model: establishing a hydrological model of the area based on natural characteristics such as precipitation, evaporation and soil conditions;
step 2, establishing a regional site pollution load model: according to the degradation effect of the wetland area on agricultural and industrial runoff pollution, a site pollution load model of the wetland area is established;
step 3, establishing a pollution total load boundary model: combining the regional hydrological model and the regional site pollution load model in the steps 1 and 2, establishing a regional pollution total load boundary model, and calculating the wetland restoration area, the nitrogen reduction amount and the total investment by taking the optimal water quality or the maximum wetland restoration construction area as a boundary condition;
step 4, confirming boundary conditions and restoring a construction scheme: and (3) obtaining the optimal boundary condition according to the ratio of the optimal water quality in the step (3) to the nitrogen reduction amount and the total investment of the maximum wetland restoration construction area, and implementing the wetland restoration construction.
The functional wetland restoration construction method comprises the following steps of:
step 1.1, dividing the area into grid models, and defining precipitation data, soil characteristics, evaporation data, irrigation data, infiltration data, population density and other data of each grid;
step 1.2, calculating the water inflow and outflow amount of each grid according to the data in the step 1.1 by using a water amount balance principle and a substance balance principle;
and step 1.3, determining an irrigation plan of the region according to the Peneman formula according to the water inlet and outlet amount calculated in the step 1.2, determining the pollutant elimination amount of the region according to the following formula, and establishing a hydrological model of the region.
Nsr＝(N0-r)R+L
Wherein N issrIs the pollutant equivalent in surface runoff; n is a radical of0The pollutant amount discharged into the wetland along with the surface runoff is percent; r is the pollutant elimination amount,%; l is the amount of contaminant penetration, kg/m3(ii) a R is the total radial flow discharged into the wetland, m3/s。
The functional wetland restoration construction method comprises the following steps of:
step 2.1, dividing the wetland area into a plurality of drainage grids, and discharging the drainage grids into a river through one grid at a position close to the river;
and 2.2, counting COD (chemical oxygen demand), total nitrogen, total phosphorus and ammonia nitrogen according to the agricultural and industrial conditions of each drainage grid, and calculating the pollution load of the drainage grid according to the calculated COD, total nitrogen, total phosphorus and ammonia nitrogen.
In the above functional wetland restoration construction method, in the step 2, all the grids near the river are classified into one drainage grid.
In the functional wetland restoration construction method, the optimal water quality boundary condition in the step 3 is an index of a target nitrogen reduction amount in a region.
In the functional wetland restoration construction method, the boundary condition of the maximum wetland restoration construction area in the step 3 takes the target wetland restoration area in the area as an index.
In the functional wetland restoration construction method, the site pollution load model adopts a general watershed pollution load model (GWLF).
3. Advantageous effects
In conclusion, the beneficial effects of the invention are as follows:
(1) the wetland restoration construction method combines the hydrological model and the site pollution load model to obtain a pollution total load boundary model, researches the multi-target benefit of the wetland area by taking the optimal water quality or the maximum wetland restoration construction area as a boundary condition, and can improve the rationality of the wetland restoration engineering by taking the multi-target benefit as a reference of the engineering construction;
(2) the wetland restoration construction method of the invention takes the grid close to the river as a drainage grid, simplifies the construction of the site pollution load model, focuses the wetland restoration construction on the offshore wetland area on one hand, and emphasizes the wetland area which is away from the river within a certain distance range on the other hand.
Detailed Description
The following further illustrates embodiments of the present invention.
Example (b):
the invention takes Weishan lake, Zhaoyang lake, Dushan lake and Nanyang lake as examples. First, hydrological models of the four wetlands are built according to hydrological data, soil characteristics, geological characteristics, precipitation data and the like of the four wetlands, as shown in table 1.
Table 1: calculation result of hydrological simulation model application
Then, selecting two indexes of nitrogen and phosphorus in the polluted water body, establishing a general basin pollution load model of the wetland area, and calculating the total recovery cost according to the land resource value, the engineering cost and the site temporary engineering.
And then, respectively taking the optimal water quality and the maximum wetland restoration construction area as boundary conditions, and calculating the wetland restoration area, the nitrogen consumption reduction and the total investment, wherein the capital for the wetland natural protection area is 7000 ten thousand yuan per year according to the budget of the water conservancy committee of the Huaihe river of the department of Water conservancy.
Finally, Matlab software is used to calculate the model to obtain the wetland recovery area, the nitrogen reduction amount and the total investment of the two boundary conditions, as shown in table 2.
Table 2: wetland recovery simulation calculation result
And (4) analyzing results:
the optimal water quality results in a smaller number of grids, and is generally near rivers and more dispersed. The calculated result emphasizes the influence of wetland space distribution on water quality. For small watersheds, the number of grids calculated by the maximum area method is the same as that of the grids calculated by the optimal water quality method. Compared with the calculation result of the optimal water quality method, the benefit of only partial water quality is calculated by using the maximum area method. From the overall benefit situation, besides the wetland restoration construction needs to be carried out in the grid area adjacent to the river, the wetland construction needs to be carried out on the grid which is not adjacent to the river, and the grid which is adjacent to the river usually belongs to an urban area or an efficient economic area.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the content of the present specification, or any direct or indirect application attached to the technical field of other related products are included in the scope of the present invention.
Claims (6)
1. The functional wetland restoration construction method is characterized by comprising the following steps:
step 1, establishing a regional hydrological model: establishing a hydrological model of the area based on natural characteristics of rainfall, evaporation and soil conditions;
step 2, establishing a regional site pollution load model: according to the degradation effect of the wetland area on agricultural and industrial runoff pollution, a site pollution load model of the wetland area is established;
step 3, establishing a pollution total load boundary model: combining the regional hydrological model and the regional site pollution load model in the steps 1 and 2, establishing a regional pollution total load boundary model, and calculating the wetland restoration area, the nitrogen reduction amount and the total investment by taking the optimal water quality or the maximum wetland restoration construction area as a boundary condition;
step 4, confirming boundary conditions and restoring a construction scheme: obtaining the optimal boundary condition according to the ratio of the optimal water quality in the step 3 to the nitrogen reduction amount and the total investment of the maximum wetland restoration construction area, and implementing the wetland restoration construction;
the step 1 comprises the following steps:
step 1.1, dividing the area into grid models, and defining precipitation data, soil characteristics, evaporation data, irrigation data, infiltration data and population density data of each grid;
step 1.2, calculating the water inflow and outflow amount of each grid according to the data in the step 1.1 by using a water amount balance principle and a substance balance principle;
step 1.3, determining an irrigation plan of the region according to the water inlet and outlet amount calculated in the step 1.2 and a Peneman formula, determining the pollutant elimination amount of the region according to the following formula, and establishing a hydrological model of the region;
Nsr＝(N0-r)R+L
wherein N issrIs the pollutant equivalent in surface runoff; n is a radical of0The pollutant amount discharged into the wetland along with the surface runoff is percent; r is a contaminantWeight loss is eliminated,%; l is the amount of contaminant penetration, kg/m3(ii) a R is the total radial flow discharged into the wetland, m3/s。
2. The functional wetland restoration construction method according to claim 1, wherein the step 2 comprises the following steps:
step 2.1, dividing the wetland area into a plurality of drainage grids, and discharging the drainage grids into a river through one grid at a position close to the river;
and 2.2, counting COD (chemical oxygen demand), total nitrogen, total phosphorus and ammonia nitrogen according to the agricultural and industrial conditions of each drainage grid, and calculating the pollution load of the drainage grid according to the calculated COD, total nitrogen, total phosphorus and ammonia nitrogen.
3. The method for restoring and constructing a functional wetland according to claim 2, wherein in the step 2, all grids near the river are classified into one drainage grid.
4. The method for restoration of a functional wetland according to claim 2, wherein the optimal water quality boundary condition in step 3 is indicated by a target nitrogen reduction amount in a region.
5. The method for functional wetland restoration construction according to claim 2, wherein the boundary condition of the maximum wetland restoration construction area in step 3 is defined by a target wetland restoration area in a region.
6. The functional wetland restoration construction method according to claim 2, wherein the site pollution load model adopts a general basin pollution load model GWLF.
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| CN102663267A (en) * | 2012-05-15 | 2012-09-12 | 南京大学 | Method for determining drainage basin surface source pollution load of semi-humid region |
| CN103294902A (en) * | 2013-05-16 | 2013-09-11 | 中国科学院东北地理与农业生态研究所 | Method for determining natural wetland restoration plan based on remote sensing images and GIS (geographic information system) spatial analyses |
| CN106836114A (en) * | 2017-01-09 | 2017-06-13 | 中国科学院生态环境研究中心 | Administering method for eliminating rural area type black and odorous water |
| CN107368943A (en) * | 2017-06-12 | 2017-11-21 | 青海师范大学 | A kind of wetland recovery effect evaluation method |
| RU2665072C1 (en) * | 2017-11-14 | 2018-08-28 | Алексей Гавриилович Афанасьев | Method of reservoir water area localization of pollutants entering reservoir from tributaries and drains |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050273300A1 (en) * | 2003-09-29 | 2005-12-08 | Patwardhan Avinash S | Method and system for water flow analysis |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663267A (en) * | 2012-05-15 | 2012-09-12 | 南京大学 | Method for determining drainage basin surface source pollution load of semi-humid region |
| CN103294902A (en) * | 2013-05-16 | 2013-09-11 | 中国科学院东北地理与农业生态研究所 | Method for determining natural wetland restoration plan based on remote sensing images and GIS (geographic information system) spatial analyses |
| CN106836114A (en) * | 2017-01-09 | 2017-06-13 | 中国科学院生态环境研究中心 | Administering method for eliminating rural area type black and odorous water |
| CN107368943A (en) * | 2017-06-12 | 2017-11-21 | 青海师范大学 | A kind of wetland recovery effect evaluation method |
| RU2665072C1 (en) * | 2017-11-14 | 2018-08-28 | Алексей Гавриилович Афанасьев | Method of reservoir water area localization of pollutants entering reservoir from tributaries and drains |
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