CN115182293A - River channel endogenous management method - Google Patents
River channel endogenous management method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention belongs to the technical field of river ecological management, and particularly relates to a river endogenous management method, which comprises the following steps: h 1 ≥H 2 In the process, an ex-situ environment-friendly dredging mode is adopted to dredge polluted bottom mud, and a common dredging mode is adopted to dredge normal layer bottom mud; h 2 ‑N≤H 1 ＜H 2 In the process, the polluted bottom mud is dredged by adopting an ectopic environment-friendly dredging mode, and the designed bottom elevation H of the polluted bottom mud is dredged 1 Then backfilling with backfill material to the designed bottom height H of ecological restoration 2 ；H 1 ＜H 2 when-N, use ectopic environment-friendlyDredging polluted bottom mud to ecological restoration bottom elevation H 2 After N, backfilling with a backfilling material with the thickness of 0.2-0.3 m, paving natural gravel on the backfilling material, and paving the backfilled gravel until the designed bottom height H of ecological restoration is reached 2 . The invention provides a river channel endogenous treatment method adopting different treatment principles according to different pollution depths.
Description
Technical Field
The invention belongs to the technical field of ecological treatment of riverways, and particularly relates to a riverway endogenous treatment method.
Background
The prior art is as follows:
as an important component of the whole ecological environment, the river channel bears the transportation of water resources and has the function of buffering ecological pollution. With the rapid increase of population and economy, the development at the cost of environmental sacrifice causes huge damage to the whole environment, so that the available water resources in China are seriously reduced, the high attention of the nation is aroused, the working strength is increased in the nation and various provinces and cities, and active and effective measures are adopted to treat the river channel so as to realize the ecological restoration of the river channel. In 2016, the national issued opinion on the comprehensive development of river growth requires that all parts of the country mainly lead people as the first responsible people for river and lake environment protection so as to strengthen ecological management and protection of river and lake water areas and strictly forbid the encroachment of river channels and reclamation lakes; strengthening water ecological restoration, defining river and lake management range according to law, and strengthening management of mountain and water forest fields and lake systems.
However, the inventors of the present application have found that the above prior art has at least the following technical problems:
at present, the country treats the river from four aspects of source control and sewage interception, endogenous treatment, water system communication and ecological restoration, obtains a plurality of effects, and the endogenous treatment is an important part in the ecological treatment of the river channel, mainly refers to the phenomenon that nutrient substances entering the river channel gradually settle to the surface layer of river bottom materials through various physical, chemical and biological actions and are released to a water body after accumulating to a certain amount. Along with the implementation of source control and sewage interception engineering, endogenous control faces a lot of challenges in ecological control of river channels, for example, when the endogenous control is carried out, the problems of large polluted bottom mud thickness, incomplete clearing, large dredging amount, unstable side slope, slope drop damage of the river channel, local erosion and silt change and the like are faced, so that the endogenous control effect of the river channel is poor.
In the prior art, the contradiction exists between the bottom elevation of the river channel endogenous pollution and the bottom elevation of the ecological restoration design, which causes the defects of poor pollution removal effect, unstable slope, and serious scouring and silting in the process of endogenous source treatment.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the river channel endogenous treatment method adopting different treatment principles according to different pollution depths has important practical value.
Disclosure of Invention
The application aims to solve the technical problems in the prior art and provide a river channel endogenous treatment method adopting different treatment principles according to different pollution depths.
The technical scheme adopted by the embodiment of the application to solve the technical problems in the prior art is as follows:
a method for treating an internal source of a river channel comprises the following steps:
the method comprises the following steps: determining the designed bottom height H of the polluted bottom mud 1 And ecological restoration design bottom height H 2 ；
Step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 The size of the river course is treated by the following steps:
H 1 ≥H 2 in the process, an ex-situ environment-friendly dredging mode is adopted to dredge the polluted bottom mud, and a common dredging mode is adopted to dredge the normal layer bottom mud;
H 2 -N≤H 1 ＜H 2 when N is more than or equal to 0.6m and more than or equal to 0.4m, the polluted bottom mud is dredged in an ectopic environment-friendly dredging mode, and the designed bottom elevation H is dredged to the polluted bottom mud 1 Then backfilling with backfill material to the designed bottom height H of ecological restoration 2 The backfill compactness of the cohesive soil is not less than 0.91, and the backfill relative density of the cohesionless soil is not less than 0.60;
H 1 ＜H 2 when the sediment is minus N, wherein the sediment is more than or equal to 0.6m and more than or equal to 0.4m, the polluted sediment is dredged by adopting an ectopic environment-friendly dredging mode to reach the ecological restoration sediment height H 2 After N, backfilling with a backfill material with the thickness of 0.2-0.3 m, backfilling with cohesive soil with the compactness of not less than 0.91 and backfilling with non-cohesive soil with the relative density of not less than 0.60, laying natural gravel on the backfill material, and laying the backfill material to the bottom height H of the ecological restoration design 2 。
The embodiment of the application can also adopt the following technical scheme:
in the method for treating the internal source of the river, further, N =0.5m,
namely, the method for treating the internal source of the river comprises the following steps:
the method comprises the following steps: determining the designed bottom height H of the polluted bottom mud 1 And ecological restoration design bottom elevation H 2 ；
Step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 The size of the river course is treated by the following steps:
H 1 ≥H 2 in the process, an ex-situ environment-friendly dredging mode is adopted to dredge polluted bottom mud, and a common dredging mode is adopted to dredge normal layer bottom mud;
H 2 -0.5m≤H 1 ＜H 2 in the process, the polluted bottom mud is dredged in an ectopic environment-friendly dredging mode, and the designed bottom elevation H of the polluted bottom mud is dredged 1 Then backfilling with backfill material to the designed bottom height H of ecological restoration 2 The backfill compactness of the cohesive soil is not less than 0.91, and the backfill relative density of the non-cohesive soil is not less than 0.60;
H 1 ＜H 2 when the depth is minus 0.5m, adopting an ectopic environment-friendly dredging mode to dredge polluted bottom mud to an ecological restoration bottom elevation H 2 After-0.5 m, backfilling with backfill material to a thickness of 0.2-0.3 m, backfilling with cohesive soil with a compactness of not less than 0.91 and a relative density of backfilling without cohesive soil of not less than 0.60, laying natural gravel on the backfill material, and laying the backfill material to an ecological restoration design bottom height H 2 。
In the method for treating the internal source of the river channel, a step A is further arranged between the step one and the step two: the dredging area is partitioned and segmented, namely: h 1 ≥H 2 、H 2 -0.5m≤H 1 ＜H 2 And H 2 -0.5m≤H 1 ＜H 2 Three regions；
In the method for treating the internal source of the river channel, a step B is further arranged after the step A: and cofferdam and flow guide measures are distributed in the three areas.
In the method for treating the river channel endogenous source, further, an environment-friendly dredging method is adopted to dredge the polluted bottom mud, wherein the environment-friendly dredging method is to comprehensively determine the designed bottom elevation H of the river channel polluted bottom mud by adopting an internal Mei Luo exponential method and an adsorption analytical method 1 。
In the method for treating the river endogenous source, further, the ecological restoration design bottom elevation H 2 The principle of flushing and silting balance and smooth water flow is observed.
In the method for treating the river endogenous source, further, the polluted bottom mud is subjected to classification treatment: carrying out greening planting soil or composting treatment on the polluted bottom mud caused by the nutritive salt; adding a stabilizer and a curing agent into the polluted bottom mud caused by the heavy metals for safe landfill; and (4) carrying out hilling and trimming on the bottom mud of the normal layer.
In the method for treating the river channel endogenous source, the backfill material is cohesive soil, rock or sand gravel of a normal layer in the region, and the particle size is 0.1-0.15 cm.
In the method for treating the river channel endogenous source, furthermore, the diameter of the natural gravel is 15cm, the width of the natural gravel is not less than the width of the cross section of the river bottom, and the longitudinal direction of the natural gravel is consistent with the gradient of the river bottom.
One or more technical schemes provided in the embodiment of the application have at least the following beneficial effects:
1. the invention treats the internal source of the river channel, adopts different treatment principles according to different pollution depths, and provides a technology combining environmental protection dredging and in-situ treatment:
when the bottom elevation H is designed by the polluted bottom mud 1 Not less than ecological restoration design bottom elevation H 2 Dredging the polluted soil and the normal soil layer of the river channel respectively, so that the cleanness of the riverbed and the resource utilization of the normal soil layer can be maintained;
ecological remediation design bottom height H 2 Design bottom elevation H of polluted bottom mud with thickness of-0.5 m or less 1 When ecological restoration design is finishedElevation H 2 Designing the bottom elevation H by dredging to the polluted bottom mud in an environment-friendly dredging mode 1 Then backfilling to the bottom height H of the ecological restoration design by adopting the existing better soil texture, the blocky stones or the sand gravel stones 2 The integral stability of the riverbed is maintained, the natural river channel gradient of the riverway is maintained, the water system is promoted to be smooth, and the riverway is clean;
when the bottom elevation H is designed by the polluted bottom mud 1 Bottom elevation H of ecological restoration design 2 0.5m below zero, and excavating to ecological restoration bottom height H by adopting an environment-friendly dredging mode 2 After-0.5 m, backfilling with current good soil quality and the like, wherein the backfilling thickness is 0.2m, and paving an ecological gravel bed on the backfilled soil to the designed bottom height H of ecological restoration 2 Finally, surface finishing is carried out, so that the longitudinal direction is consistent with the gradient of the river bottom, the dredging amount of the river channel is reduced, the treatment field and cost of bottom mud are saved, the original section form of the river channel is maintained, and the safety and the stability of slope protection and a river bed are facilitated; the application of the in-situ covering technology creates conditions for slowly degrading pollutants in the polluted bottom mud and effectively cutting off the communication between the polluted soil and water; the gravel is laid to adsorb pollutants in water, and microorganisms are attached to the surface of the gravel to form a biological film, so that the decomposition of organic matters in water can be promoted.
2. The river channel endogenous treatment method maintains the river channel section, does not influence the original functions of flood control, waterlogging drainage, landscape and the like of the river channel, does not form secondary pollution or cause transfer of pollutants, forms the river channel endogenous treatment method, and is worthy of popularization and application.
3. According to the invention, dredging of different processes is carried out according to the depth of polluted bottom mud, and the three working conditions in the river channel generally exist, so that the construction can be carried out by dredging in sections, the working surfaces are more, the ecological restoration bottom elevation can be quickly backfilled, the exposure time of the riverbed is reduced, and the method has the characteristics of simple construction process, no need of large-scale machinery and quick progress.
Drawings
Technical solutions of embodiments of the present application will be described in further detail below with reference to the accompanying drawings, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present application. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a flow chart of the method for treating the internal source of the river channel.
FIG. 2 is a schematic sectional view (H) of the method for treating the internal source of river channel according to the present invention 1 ≥H 2 )。
FIG. 3 is a schematic cross-sectional view of the method for treating the internal source of river (H) 2 -0.5m≤H1＜H 2 )。
FIG. 4 is a schematic cross-sectional view of the method for treating the internal source of river (H) 1 ＜H 2 -0.5m)。
FIG. 5 is a typical longitudinal section of river drilling polluted sediment in the method for treating the river endogenous water according to the preferred embodiment of the invention.
Detailed Description
The specific repairing steps in this example are as follows:
the method comprises the following steps: determining the range and depth of the endogenous pollution of the river channel, and comprehensively determining the design bottom height H of the polluted bottom mud of the river channel by adopting an internal Mei Luo index method and an adsorption analysis method 1 The standard meets the relevant standard; ecological restoration design bottom elevation H is carried out on river channel simultaneously 2 Determination of (3), ecological restoration design base elevation H 2 The principle of erosion-deposition balance and smooth water flow is observed, and the relevant standard of river ecological management is met.
Step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 According to the thickness of the polluted sediment and the environment-friendly dredging layered dredging capacity, the dredging area is partitioned, namely: h 1 ≥H 2 、H 2 -0.5m≤H 1 ＜H 2 、H 1 ＜H 2 -0.5m：
The maximum thickness of the environment-friendly dredging layer excavation is 0.5m, meanwhile, the excavation of the excessively thick backfill soil needs to be compacted layer by layer, and the number of working procedures is large, so that 0.5m is adopted as the maximum disturbance depth of the ecological restoration design bottom elevation.
Step three: cofferdams and flow guiding measures are arranged in the three areas so as to dredge and dispose the internal sources of the river channel, and the relevant standard of ecological management of the river channel is met.
Step four: and (3) river channel endogenous treatment:
A、H 1 ≥H 2 the designed bottom elevation of the polluted bottom mud does not reach the designed bottom elevation of ecological restoration;
adopt the environmental protection of dystopy dredging mode to dredge and dig polluted bottom mud, adopt ordinary dredging mode to dredge and dig normal layer bottom mud, its dredged soil should be measured respectively, pollute bottom mud and classify according to the harm degree and deal with: n, P and other nutrient salts can cause pollution to bottom mud, and greening planting soil or composting can be carried out; the polluted bottom mud caused by heavy metals can be added with a stabilizer and a curing agent for safe landfill; the sediment on the normal layer is used for carrying out banking and finishing on the river channel so as to realize classification treatment, avoid secondary pollution and achieve the purpose of using the sediment as much as possible.
B、H 2 -0.5m≤H 1 ＜H 2 The designed bottom elevation of the polluted bottom mud exceeds the designed bottom elevation of the ecological restoration by 0 to 0.5m;
dredging polluted bottom mud by adopting an ectopic environment-friendly dredging mode, carrying out classification treatment on the polluted bottom mud according to the scheme, and dredging to the polluted bottom mud to design a bottom elevation H 1 Then backfilling to the bottom height H of the ecological restoration design by adopting the existing better soil texture, the blocky stones or the sand gravel stones 2 The backfill compactness of the cohesive soil is not less than 0.91, the backfill relative density of the non-cohesive soil is not less than 0.60, and the integral stability of the riverbed is maintained so as to ensure the flow state of the water flow of the riverway.
C、H 1 ＜H 2 The designed bottom elevation of the polluted bottom mud of minus 0.5m exceeds the designed bottom elevation of the ecological restoration.
Dredging polluted bottom mud by adopting an ectopic environment-friendly dredging mode, performing classification treatment on the polluted bottom mud according to the scheme, dredging to the ecological restoration bottom elevation H 2 After-0.5 m, backfilling with current better soil quality, etc., with a backfilling thickness of 0.2m, a backfilling compactness of cohesive soil not less than 0.91, a backfilling relative density of cohesionless soil not less than 0.60, to prevent the influence of lower contaminated soil on water quality, and paving an ecological gravel bed on the backfilled cohesive soil till ecological restoration design bottom height H 2 The gravel has an average diameter of 15cm, the longitudinal direction is consistent with the slope of the river bottom, and the backfilling is required to be equal toThe method is carried out in time, and the exposure time of the excavation surface is shortened as much as possible. The backfill work needs to uniformly backfill the periphery of the bottom protection layer in a layering way, and the density is more than 90 percent.
The gravel bed has the functions of filtration, adsorption, precipitation, ion exchange, plant absorption, microorganism decomposition and the like, so that the gravel bed can purify water quality and simultaneously has the function of preventing scouring.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
The invention relates to a method for internally governing a small black river of a river channel located in a northern loop of a peony area in the Neze city, wherein the governing range is Chongqing road-great wall road section, the upstream width is 3-5 m, the downstream is 6-10 m, the river channel passes through logistics park areas, residential areas, sewage treatment plants, schools and other areas along the way, the total length is 3.4km, and the functional positioning is as follows: flood storage and drainage, water and soil conservation, habitat and rest. The problem of endogenous pollution is also serious because the urban river channel is influenced by human activities for a long time, and because the water quality of the river channel is continuously deteriorated and the water environment capacity is continuously reduced, a large amount of pollutants are enriched in the bottom mud of the river channel to form endogenous pollution.
According to the pollution condition and the current situation of the sediment of the embodiment, factors in the aspects of local geological conditions, water flow conditions, construction conditions, investment, management and operation and the like are comprehensively considered, and the river channel endogenous management scheme is determined according to local conditions.
Specifically, as shown in fig. 1, the flow chart of the method for treating the river endogenous source in the embodiment of the present invention mainly adopts the ectopic environmental-friendly dredging, the in-situ covering technology and the ecological gravel bed technology, and includes the following steps:
the method comprises the following steps: determining the range and depth of the endogenous pollution of the river channel, and determining the ecological restoration design base level of the river channel at the same time, wherein the river channel meets the relevant standard regulation;
step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 According to the thickness of the polluted bottom mud and the condition that the maximum dredging depth of the environmental protection dredging is 0.5mThe dredging area is partitioned and segmented, namely: h 1 ≥H 2 、H 2 -0.5m≤H 1 ＜H 2 And H 2 -0.5m≤H 1 ＜H 2 Three regions;
step three: cofferdams and flow guiding measures are arranged in the three areas so as to dredge and dispose the internal sources of the river channel, and the relevant standard of ecological management of the river channel is met.
Step four: and (3) river channel endogenous treatment:
A、H 1 ≥H 2 the designed bottom elevation of the polluted bottom mud does not reach the designed bottom elevation of ecological restoration;
B、H 2 -0.5m≤H 1 ＜H 2 the designed bottom elevation of the polluted bottom mud exceeds the designed bottom elevation of the ecological restoration by a certain depth;
C、H 1 ＜H 2 the designed bottom elevation of the polluted bottom mud of minus 0.5m exceeds the designed bottom elevation of the ecological restoration.
Step four: cofferdams and flow guiding measures are arranged in the three areas so as to dredge and dispose the internal sources of the river channel, and the relevant standard of ecological control of the river channel is met.
In the first step, the pollution bottom mud is evaluated by an internal Mei Luo pollution index method and a heavy metal potential ecological risk evaluation method, the color of a pollution layer in water is mainly gray black, the main lithology is sludge and mud flow, the pollution layer contains more humus and has stronger fishy smell, and the pollution layer is occasionally provided with shells, has a newer deposition age and good water and soil exchange performance and is easy to generate endogenous pollution to a water body. The main pollutants are mainly nitrogen/phosphorus pollution, and no heavy metal pollution phenomenon is seen.
The investigation result is shown in fig. 5, artificial sand and a gravel cushion layer commonly exist at the bottom of the river except for a north individual section, so that the sand and the gravel cushion layer are judged as a pollution layer, the thickness variation range of the polluted bottom mud is 0.30-1.70m, and the average thickness is 0.65m; the variation range of the layer bottom elevation is 46.45-48.56 m, and the average elevation is 47.63m.
According to investigation and disclosure, the pollution layer is thicker under the influence of pollution discharge, and the pollution layer is disclosed to be 2.09m in the drill holes of No. XHHZK7 and XHHZK718, and the average thickness is 0.58m; the variation range of the layer bottom elevation is 45.61-47.58 m, and the average elevation is 46.75m.
In the second step, according to the polluted bottom mud and the dredging capacity of the dredging equipment, the river channel is divided into four regions of K0+ 000-K1 +000, K1+ 331-K2 +868, K1+ 000-K1 +331 and K2+ 868-K3 +400, wherein K0+ 000-K1 +000 is H 1 ≥H 2 Section, K1+ 000-K1 +331, K2+ 868-K3 +400 are H 2 -0.5m≤H 1 ＜H 2 Section, K1+ 000-K1 +331 are H 1 ＜H 2 -0.5m sections.
And (3) constructing 5 sections of cofferdams in total in the three steps, and dredging after sectional drainage.
In the fourth step a, see the longitudinal section of the river drilling coring polluted bottom mud figure 5,
as the XHHZX14 drill holes are hard masonry river bottoms, the covering layers are all silted soil which can be regarded as H 1 ≥H 2 ，
And the polluted bottom mud at the XHHZX15 and XHHZX16 drill holes does not reach the bottom elevation of the ecological restoration design, namely: h 1 ≥H 2 Performing ex-situ environmental-friendly dredging to dispose sediment;
in the step IV, the polluted bottom mud exceeds the bottom elevation of the ecological restoration design by a certain depth at the XHHZX17 drill hole, namely: h 2 -0.5m≤H1＜H 2 (ii) a After dredging to the designed bottom elevation of the polluted bottom mud, backfilling to the designed bottom elevation of the ecological restoration by adopting the soil, the rock block or the sand gravel with better current situation, and the like so as to maintain the stability of the river bottom;
in the fourth step, the polluted bottom mud exceeds the bottom elevation of the ecological restoration design at the XHHZX18 drill hole, namely: h 1 ＜H 2 0.5m below zero, and dredging to ecological restoration bottom height H 2 After-0.5 m, backfilling by using the existing better soil quality and the like, and treating by using the process of an ecological gravel bed until the bottom elevation H of the ecological restoration design is reached 2 The longitudinal direction is consistent with the gradient of the river bottom.
The repair length of the tail end of the river bottom of the small black river is 3.4km, and the dredging engineering quantity is about 21243m 3 (Table 1), organic matters 639.98t, TN35.41t and TP40.98t are removed, and an ecological gravel bed with the length of about 1537m and the total area of about 99 m is constructed at the K1+ 331-K2 +868 position of a river section with larger polluted bottom mud thickness90.5m 2 。
TABLE 1 engineering scale
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
in the example, the engineering quantity of the dredging and dirt-staining soil of the treatment mode of the patent is about 21243m 3 The traditional environment-friendly dredging engineering amount is 43546m 3 The method can save the space and cost for disposing the polluted soil, and is favorable for maintaining the section shape of the river and the requirement of purifying water quality.
In conclusion, the invention provides a river endogenous treatment method adopting different treatment principles according to different pollution depths.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A river channel endogenous treatment method is characterized in that: the river channel endogenous regulation method comprises the following steps:
the method comprises the following steps: determining the designed bottom height H of the polluted bottom mud 1 And ecological restoration design bottom elevation H 2 ；
Step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 The size of the river course is treated by the following steps:
H 1 ≥H 2 in the process, an ex-situ environment-friendly dredging mode is adopted to dredge polluted bottom mud, and a common dredging mode is adopted to dredge normal layer bottom mud;
H 2 -N≤H 1 ＜H 2 when the depth of N is more than or equal to 0.6m and more than or equal to 0.4m, the polluted bottom mud is dredged by adopting an ex-situ environment-friendly dredging mode, and the designed bottom height H of the polluted bottom mud is dredged 1 After that, the air conditioner is started to work,backfilling with backfill material to ecological restoration design bottom height H 2 The backfill compactness of the cohesive soil is not less than 0.91, and the backfill relative density of the non-cohesive soil is not less than 0.60;
H 1 ＜H 2 when the sediment is minus N, wherein the sediment is more than or equal to 0.6m and more than or equal to 0.4m, the polluted sediment is dredged by adopting an ectopic environment-friendly dredging mode to reach the ecological restoration sediment height H 2 After N, backfilling with a backfilling material to a thickness of 0.2-0.3 m, backfilling with cohesive soil to a compactness of not less than 0.91 and backfilling with cohesionless soil to a relative density of not less than 0.60, paving natural gravel on the backfilled cohesive soil, and paving the backfilled cohesive soil to an ecological restoration design bottom height H 2 。
2. The method for the endogenous regulation of river channels according to claim 1, wherein the method comprises the following steps: n =0.5m and N is,
namely, the method for treating the internal source of the river comprises the following steps:
the method comprises the following steps: determining the designed bottom height H of the polluted bottom mud 1 And ecological restoration design bottom elevation H 2 ；
Step two: judging the designed bottom height H of the polluted bottom mud 1 Ecological restoration design bottom elevation H 2 The size of the river course is treated by the following steps:
H 1 ≥H 2 in the process, an ex-situ environment-friendly dredging mode is adopted to dredge polluted bottom mud, and a common dredging mode is adopted to dredge normal layer bottom mud;
H 2 -0.5m≤H 1 ＜H 2 in the process, the polluted bottom mud is dredged by adopting an ectopic environment-friendly dredging mode, and the designed bottom elevation H of the polluted bottom mud is dredged 1 Then backfilling with backfilling material to ecological restoration design bottom height H 2 The backfill compactness of the cohesive soil is not less than 0.91, and the backfill relative density of the non-cohesive soil is not less than 0.60;
H 1 ＜H 2 when the depth is minus 0.5m, adopting an ectopic environment-friendly dredging mode to dredge polluted bottom mud to an ecological restoration bottom elevation H 2 After-0.5 m, backfilling with backfill material to a thickness of 0.2-0.3 m, backfilling with cohesive soil with a compactness of not less than 0.91 and a relative density of backfilling without cohesive soil of not less than 0.60, laying natural gravel on the backfill material, and laying the backfill material to an ecological restoration design bottom height H 2 。
3. The method for the endogenous regulation of river channels according to claim 2, wherein: a step A is arranged between the first step and the second step: the dredging area is partitioned and segmented, namely: h 1 ≥H 2 、H 2 -0.5m≤H 1 ＜H 2 And H 2 -0.5m≤H 1 ＜H 2 Three regions.
4. The method for the endogenous regulation of river channels according to claim 3, wherein: the step A is followed by a step B: and cofferdam and flow guide measures are distributed in the three areas.
5. The method for the endogenous regulation of river channels according to claim 1, wherein the method comprises the following steps: dredging polluted bottom mud by adopting an environment-friendly dredging mode, wherein the environment-friendly dredging mode is to comprehensively determine the designed bottom elevation H of the polluted bottom mud of the river channel by adopting an internal Mei Luo exponential method and an adsorption analysis method 1 。
6. The method for the endogenous regulation of river channels according to claim 1, wherein the method comprises the following steps: ecological remediation design bottom elevation H 2 The principle of flushing and dredging balance and smooth water flow is observed.
7. The method for treating the internal source of the river channel according to claim 1, wherein the method comprises the following steps: the polluted bottom mud is classified and treated: carrying out greening planting soil or composting treatment on the polluted bottom mud caused by the nutritive salt; adding a stabilizer and a curing agent into the polluted bottom mud caused by the heavy metals for safe landfill; and (5) carrying out banking and trimming on the river channel by using the bottom mud of the normal layer.
8. The method for the endogenous regulation of river channels according to claim 1, wherein the method comprises the following steps: the backfill material is cohesive soil, lump stone or sand gravel of a normal layer in the region, and the particle size is 0.1-0.15 cm.
9. The method for the endogenous regulation of river channels according to claim 1, wherein the method comprises the following steps: the average diameter of the natural gravel is 15cm, the width of the natural gravel is not less than the width of the cross section of the river bottom, and the longitudinal direction of the natural gravel is consistent with the slope of the river bottom.
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