CN111747532B - Tidal type branch river mouth water ecological system of post-dam dewatering river reach and construction method - Google Patents
Tidal type branch river mouth water ecological system of post-dam dewatering river reach and construction method Download PDFInfo
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Abstract
The invention discloses a tidal type branch river mouth water ecological restoration system and method for a post-dam dewatering river reach, which comprises the following steps: the system comprises a first bank slope type wetland, a second bank slope type wetland, a first overflow type wetland, a second overflow type wetland, a first group of wetland hydrological branches, a second group of wetland hydrological branches and a gate; the invention solves the problems that the existing wetland layout of the branch backwater area mostly adopts a single wetland type and has single function when the wetland technology is used.
Description
Technical Field
The invention relates to the technical field of ecological engineering, in particular to a tidal type branch river mouth water ecological system of a post-dam dewatering river reach and a construction method.
Background
The branch in the section of the post-dam dewatering river reach is regulated and controlled by the dam, the water quantity is large in the flood period and other factors, the water flow of the dewatering river reach is changed violently, the water level of the river reach rises rapidly in a short time, the phenomenon of reducing the branch in the section of the dewatering river reach where water flows backward can occur, a water return area with a wide range is formed in the area of the branch river reach and is similar to the periodic movement of seawater generated under the action of the gravitational force of the heaven body, the manual regulation and control of the dam enables the branch river mouth to change in a tide mode, and the water at the branch river mouths before and after the regulation presents a reciprocating flow phenomenon.
In the flood period, the tributary return water area is because of receiving tributary upper reaches to come water, two kinds of temperatures of water, density, nature such as pollutant are all different water mass compound influence on the top of the trunk, the velocity of flow is changeable, the layering flow characteristics of flow of abnormal weight appear, lead to tributary return water district velocity of flow to slow down, the self-purification ability of water reduces, nutrient substance such as nitrogen, phosphorus gathers, and very easily satisfy the velocity of flow condition that the alga gathers to grow, suitable condition is provided for the growth of alga, eutrophication phenomenon easily appears in the return water area, lead to ecological environment problems such as regional quality of water deterioration and biodiversity reduction.
At present, the wetland technology is adopted to treat water eutrophication in many cases, the artificial wetland technology is the most representative, but the research results on reducing the water quality purification of the tributary estuary wetland in the dehydrated river reach interval are less. The branch of the dewatering river reach is reduced and influenced by the artificial regulation and control of an upstream dam, a backwater area is easy to appear at a branch river mouth, tidal change occurs, the existing wetland layout of the branch backwater area is related to, a single wetland type is adopted when the wetland technology is used, and the function is single. The invention provides a tidal type branch estuary water ecological system of a post-dam dewatering river reach aiming at a diversion estuary in a post-dam dewatering river reach interval, wherein a wetland is a main component of the system, and the system provides reference for ecological environment protection of similar areas.
Disclosure of Invention
Aiming at the defects in the prior art, the tidal type branch estuary water ecosystem and the construction method thereof for the post-dam dewatering river reach provided by the invention solve the problems that the existing branch water return region wetland layout mostly adopts a single wetland type and has a single function when the wetland technology is used.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a behind-dam dewatering stretch tidal tributary estuary water ecosystem, comprising: the system comprises a first bank slope type wetland, a second bank slope type wetland, a first overflow type wetland, a second overflow type wetland, a first group of wetland hydrological branches, a second group of wetland hydrological branches and a gate;
the first bank slope type wetland, the first overflowing type wetland and the first group of wetland hydrological branches are positioned on one side of a branch estuary return water area of the dewatering river section; the second bank slope type wetland, the second overflowing type wetland and the second group of wetland hydrological branches are positioned on the other side of the branch estuary return water area of the dewatering river section; the first bank slope type wetland is positioned between the first overflowing type wetland and a branch estuary return water area of the dewatering river section; the first group of wetland hydrological branches span the first bank slope type wetland, one end of each wetland hydrological branch is connected with one side of a branch river mouth water return area of the dewatering river section through a gate, and the other end of each wetland hydrological branch is connected with the first overflowing type wetland; the second bank slope type wetland is positioned between the second overflowing type wetland and a branch estuary return water area of the dewatering river section; and the second group of wetland hydrological branches span the second bank slope type wetland, one end of each wetland hydrological branch is connected with the other side of the branch estuary return water area of the dewatering river section through a gate, and the other end of each wetland hydrological branch is connected with the second overflowing type wetland.
The beneficial effects of the above further scheme are: the first bank slope type wetland and the second bank slope type wetland are arranged on two sides of a branch river channel and serve as vegetation buffer zones in a non-flood period, pollutants generated due to slope convergence can be intercepted, and surface source pollution is reduced.
Further, the first and second diffused wetlands comprise, from the surface to the ground: the artificial soil comprises a cobble layer, a mixed soil layer, a zeolite layer, a volcanic rock layer, a ceramsite layer and a tire granular layer.
Furthermore, the particle size of cobbles of the cobble layer is 6cm to 8cm, and the thickness of the cobbles is 5 cm; the thickness of the mixed soil layer is 15 cm; the thickness of the zeolite layer is 24cm, and the particle size of the zeolite layer is 2 mm-5 mm; the thickness of the volcanic rock layer is 12cm, and the particle size of the volcanic rock layer is 2 cm-5 cm; the thickness of the ceramic particle layer is 12cm, and the particle size of the ceramic particle layer is 2mm to 5 mm; the thickness of the tire particle layer is 12cm, and the particle size is 2mm to 6 mm.
A method for ecologically restoring tidal type branch river mouth water of a post-dam dewatering river reach comprises the following steps:
s1, according to the current situation on two sides of the branch estuary backwater area of the dewatering estuary, performing earth excavation dam and then reducing the tidal branch estuary water ecosystem of the dewatering estuary;
s2, restoring the ecology of the tidal type branch estuary water of the post-dam dewatering estuary through the tidal type branch estuary water ecosystem of the post-dam dewatering estuary.
Further, in the step S1, the following sub-steps are performed:
s11, excavating a first bank slope type wetland, a second bank slope type wetland, a first overflowing type wetland, a second overflowing type wetland, a first group of wetland hydrological branches and a second group of wetland hydrological branches according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
s12, constructing the first bank slope type wetland, the second bank slope type wetland, the first overflowing type wetland, the second overflowing type wetland, the first group of wetland hydrological branches and the second group of wetland hydrological branches to obtain the tidal type branch estuary water ecological system of the dewatering river reach after the earth excavation dam is excavated.
Further, the method for constructing the first group of wetland hydrological branches and the second group of wetland hydrological branches in the step S12 includes:
a1, excavating a plurality of wetland hydrological branches according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
a2, planting submerged plants in the deep water area of the wetland hydrology branch, and planting emergent plants in the shallow water area of the wetland hydrology branch;
a3, arranging a plurality of wetland hydrological branches planted with plants between a branch estuary return water area of a dewatering river reach and a first overflowing wetland, and crossing a first bank slope type wetland to form a first group of wetland hydrological branches;
and A4, arranging a plurality of wetland hydrological branches planted with plants between the second overflowing wetland and the branch estuary return area of the dewatering river reach, and crossing the second bank slope type wetland to form a second group of wetland hydrological branches.
Further, the submerged plant in the step A2 comprises: curly pondweed, bitter grass, potamogeton malabaricum and hornwort;
the emergent aquatic plants comprise: reed, water onion, calamus, cress and arrowhead.
The beneficial effects of the above further scheme are: suspended particles are blocked and controlled in the process of water removal through submerged plants and emergent plants.
Further, the method for constructing the first and second overflowing type wetlands in step S12 includes the following steps:
b1, dredging a plurality of streams according to the current situation on two sides of a branch estuary return water area of the dewatering river reach;
b2, hooking and staggering a plurality of streams to form a stream characteristic wetland;
b3, performing terrace-type arrangement on the stream characteristic wetland from upstream to downstream to construct a stream terrace characteristic wetland;
b4, connecting the stream terrace characteristic wetland on one side of the branch estuary return water area of the dewatering river reach with the tail end of the first group of wetland hydrological branches to form a first overflowing type wetland;
and B5, connecting the stream terrace characteristic wetland on the other side of the branch estuary return water area of the dewatering river reach with the tail end of the second group of wetland hydrological branches to form a second overflowing type wetland.
The beneficial effects of the above further scheme are: in the flood period, the gate is opened, water in the branch water return area is induced to the artificially excavated wetland hydrological branch through the topographic conditions, enters the overflowing wetland through the wetland hydrological branch, and is filtered out of nitrogen, phosphorus and other nutrients through the cobble layer, the mixed soil layer, the coal ash and slag and blast furnace slag mixed layer, the gravel layer, the tire particle and ceramic filter material mixed layer.
In conclusion, the beneficial effects of the invention are as follows: when water rises in a flood period, the restoration system serves as a river overflowing beach area, and due to the fact that the water level of a branch water return area rises continuously, water in the water return area enters an overflowing wetland through a bank slope type wetland through an artificial induction wetland hydrological branch, the overflowing wetland is arranged in a terrace mode, water is taken from the wetland hydrological branch, gravity self-flow water distribution is conducted, operation electric power cost is saved, meanwhile, different dissolved oxygen environments are formed through the change and the regulation of the water level and the flow in the wetland, the purification of pollutants is promoted, efficient nitrogen and phosphorus removal fillers are arranged on all layers of a overflowing wetland matrix, and the effect of the overflowing wetland on the removal of nitrogen and phosphorus is enhanced. In the non-flood period, the overflowing type wetland serves as a buffer zone, the bank slope type wetland serves as a riverside zone, pollutants migrating due to slope convergence can be effectively intercepted, the influence of non-point source pollution on the quality of branch water is reduced, and the water purification can be performed in different water periods. The bank slope type wetland plants can also reinforce the bank slope to reduce the erosion. Compared with a single wetland treatment technology, the invention designs a plurality of treatment technologies, fully plays the role of mutual coordination and complementation of all levels of wetlands, and improves the efficiency of water purification.
Drawings
FIG. 1 is a block diagram of a behind-dam tidal tributary estuary water ecosystem;
FIG. 2 is a flow chart of a method for ecologically restoring the mouth water of a tidal type branch river of a post-dam dewatering river reach;
wherein, 1, a first bank slope type wetland; 2. a second bank slope type wetland; 3. a first overflowing wetland; 4. a second overflowing wetland; 5. a first group of wetland hydrological branches; 6. a second group of wetland hydrological branches; 7. and (4) a gate.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, a tidal type branch canal mouth water ecosystem of a post-dam dewatering canal section comprises: the system comprises a first bank slope type wetland 1, a second bank slope type wetland 2, a first overflow type wetland 3, a second overflow type wetland 4, a first group of wetland hydrological branches 5, a second group of wetland hydrological branches 6 and a gate 7;
the first bank slope type wetland 1, the first overflowing type wetland 3 and the first group of wetland hydrological branches 5 are positioned on one side of a branch river mouth water return area of the dewatering river section; the second bank slope type wetland 2, the second overflowing type wetland 4 and the second group of wetland hydrological branches 6 are positioned on the other side of the branch estuary return water area of the dewatering river section; the first bank slope type wetland 1 is positioned between the first overflowing type wetland 3 and a branch estuary return water area of a dewatering river section; the first group of wetland hydrological branches 5 cross the first bank slope type wetland 1, one end of each wetland hydrological branch is connected with one side of a branch estuary return water area of the dewatering river section through a gate 7, and the other end of each wetland hydrological branch is connected with the first overflowing type wetland 3; the second bank slope type wetland 2 is positioned between the second overflowing type wetland 4 and a branch estuary return water area of a dewatering river section; the second group of wetland hydrological branches 6 cross the second bank slope type wetland 2, one end of each wetland hydrological branch is connected with the other side of the branch estuary return water area of the dewatering river reach through a gate 7, and the other end of each wetland hydrological branch is connected with the second overflowing type wetland 4.
The first and second diffused wetlands 3 and 4 comprise, from the surface to the ground: the artificial soil comprises a cobble layer, a mixed soil layer, a zeolite layer, a volcanic rock layer, a ceramsite layer and a tire granular layer.
The particle size of cobbles of the cobble layer is 6cm to 8cm, and the thickness of the cobbles is 5 cm; the thickness of the mixed soil layer is 15 cm; the thickness of the zeolite layer is 24cm, and the particle size of the zeolite layer is 2 mm-5 mm; the thickness of the volcanic rock layer is 12cm, and the particle size of the volcanic rock layer is 2 cm-5 cm; the thickness of the ceramic particle layer is 12cm, and the particle size of the ceramic particle layer is 2mm to 5 mm; the thickness of the tire particle layer is 12cm, and the particle size is 2mm to 6 mm.
As shown in fig. 2, a method for ecologically restoring the mouth water of a tidal type branch river of a post-dam dewatering river reach comprises the following steps:
s1, according to the current situation on two sides of the branch estuary backwater area of the dewatering estuary, performing earth excavation dam and then reducing the tidal branch estuary water ecosystem of the dewatering estuary;
in step S1, the following substeps are performed:
s11, excavating a first bank slope type wetland 1, a second bank slope type wetland 2, a first overflowing type wetland 3, a second overflowing type wetland 4, a first group of wetland hydrological branches 5 and a second group of wetland hydrological branches 6 according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
s12, constructing the first bank slope type wetland 1, the second bank slope type wetland 2, the first overflowing type wetland 3, the second overflowing type wetland 4, the first group of wetland hydrological branches 5 and the second group of wetland hydrological branches 6 to obtain the tidal branch estuary water ecological system of the dewatering river reach after the earthwork dam is excavated.
The method for constructing the first group of wetland hydrological branches 5 and the second group of wetland hydrological branches 6 in the step S12 comprises the following steps:
a1, excavating a plurality of wetland hydrological branches according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
a2, planting submerged plants in the deep water area of the wetland hydrology branch, and planting emergent plants in the shallow water area of the wetland hydrology branch;
the submerged plant in the step a2 includes: curly pondweed, bitter grass, potamogeton malabaricum and hornwort;
the emergent aquatic plants comprise: reed, water onion, calamus, cress and arrowhead.
A3, arranging a plurality of wetland hydrological branches planted with plants between a branch estuary return water area of a dewatering river reach and a first overflowing wetland 3, and crossing a first bank slope type wetland 1 to form a first group of wetland hydrological branches 5;
a4, arranging a plurality of wetland hydrological branches planted with plants between the second overflowing wetland 4 and the branch estuary return area of the dewatering river reach, and crossing the second bank slope type wetland 2 to form a second group of wetland hydrological branches 6.
The method for constructing the first and second overflowing type wetlands 3 and 4 in the step S12 includes the following steps:
b1, dredging a plurality of streams according to the current situation on two sides of a branch estuary return water area of the dewatering river reach;
b2, hooking and staggering a plurality of streams to form a stream characteristic wetland;
b3, performing terrace-type arrangement on the stream characteristic wetland from upstream to downstream to construct a stream terrace characteristic wetland;
b4, connecting the stream terrace characteristic wetland on one side of the branch estuary return water area of the dewatering river reach with the tail end of the first group of wetland hydrological branches 5 to form a first overflowing type wetland 3;
and B5, connecting the stream terrace characteristic wetland on the other side of the branch estuary return water area of the dewatering river reach with the tail end of the second group of wetland hydrological branches 6 to form a second overflowing wetland 4.
S2, restoring the ecology of the tidal type branch estuary water of the post-dam dewatering estuary through the tidal type branch estuary water ecosystem of the post-dam dewatering estuary.
The specific water quality purification process flow is as follows: branch backwater → wetland hydrological branch → bank slope type wetland → diffuse flow type wetland → river entry.
When the flood period rises tide, the branch backwater passes through the wetland hydrological branch by artificial induction, part of solid particles are filtered and intercepted, then the branch backwater enters the bank slope type wetland, the bank slope type wetland is subjected to temporary treatment and then enters the overflow type wetland through the wetland hydrological branch, the overflow type wetland simulates the characteristics of a natural wetland, a plurality of streams are dredged to form strip-shaped wetland characteristics, the stream characteristic wetland is constructed, the water body coverage area is increased, the terrace type arrangement is adopted, water is taken from the wetland hydrological branch, gravity self-flow water distribution is repeated, different dissolved oxygen environments are formed by changing and regulating the water level and the flow in the wetland, the purification of pollutants is promoted, and the overflow type wetland is provided with layers of efficient nitrogen and phosphorus removal fillers, so that the strengthening removal effect of the overflow type wetland on nitrogen and phosphorus is strengthened, and the water quality treatment effect is greatly improved.
The following experimental data in this example, in comparison with the disclosed filler combinations, demonstrate the better effectiveness of the surface-to-subsurface layer matrix construction in the flooded wetlands of the present invention.
The following are the adsorption effects of 16 existing substrate combinations on nitrogen and phosphorus, and the distribution of the 16 substrate combinations is 1: 50% red brick +25% round +25% boil 2: 50% coal +25% run +25% boil 3: 50% pottery +25% red brick +25% wheel 4: 50% of coal, 25% of red brick and 25% of pottery 5: 50% boiling +25% red brick +25% coal 6: 50% wheel +25% pottery +25% coal 7: 20% red brick, 20% round, 20% pottery, 40% boiling 8: 20% red brick, 20% round, 20% pottery, 40% boiling 9: 25% round +25% pottery +50% boil 10: 50% red brick +25% boiling +25% pottery 11: 50% pottery +25% boiling +25% coal 12: 50% boiling +25% run +25% coal 13: 50% boiling +25% run +25% coal 14: 20% boiling, 20% rotation, 20% anthracite, 20% rock, 20% pottery 15: 25% boiling +25% run +25% rock +25% pottery 16: 40% boiling, 20% coal, 20% rock and 20% pottery; wherein, zeolite is used as the boiling point, tyre particles are used as the wheels, anthracite is used as the coal, volcanic rock is used as the rock, and ceramsite is used as the pottery.
The substrate ratios of the present invention are shown in table 1, compared to the existing 16 substrate ratios, for the adsorption effect on nitrogen and phosphorus.
Table 1: final adsorption capacity of various combined matrixes for nitrogen and phosphorus within 48h
As can be seen from the comparison in Table 1, the comprehensive performance of the matrix mixture ratio of the invention is superior to that of other 16 existing matrix mixtures ratios.
Claims (7)
1. A behind-dam dewatering stretch tide type branch river mouth water ecosystem is characterized by comprising: the system comprises a first bank slope type wetland (1), a second bank slope type wetland (2), a first overflowing type wetland (3), a second overflowing type wetland (4), a first group of wetland hydrological branches (5), a second group of wetland hydrological branches (6) and a gate (7);
the first bank slope type wetland (1), the first overflowing type wetland (3) and the first group of wetland hydrological branches (5) are positioned on one side of a branch estuary water return area of the dewatering river section; the second bank slope type wetland (2), the second overflowing type wetland (4) and the second group of wetland hydrological branches (6) are positioned on the other side of the branch estuary backwater area of the dewatering river section; the first bank slope type wetland (1) is positioned between the first overflowing type wetland (3) and a branch estuary return area of a dewatering river section; the first group of wetland hydrological branches (5) cross the first bank slope type wetland (1), one end of each wetland hydrological branch is connected with one side of a branch estuary water return area of the dewatering river section through a gate (7), and the other end of each wetland hydrological branch is connected with the first overflowing type wetland (3); the second bank slope type wetland (2) is positioned between the second overflowing type wetland (4) and a branch estuary return area of the dewatering river section; the second group of wetland hydrological branches (6) cross the second bank slope type wetland (2), one end of each wetland hydrological branch is connected with the other side of a branch estuary water return area of the dewatering river section through a gate (7), the other end of each wetland hydrological branch is connected with the second overflowing type wetland (4), and water in the water return area enters the overflowing type wetland through the bank slope type wetland through the artificial induced wetland hydrological branches;
the first and second overflowing wetlands (3, 4) comprise, from the surface to the underground: the artificial soil comprises a cobble layer, a mixed soil layer, a zeolite layer, a volcanic rock layer, a ceramsite layer and a tire granular layer;
the construction method of the first group of wetland hydrological branches (5) and the second group of wetland hydrological branches (6) comprises the following steps:
a1, excavating a plurality of wetland hydrological branches according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
a2, planting submerged plants in the deep water area of the wetland hydrology branch, and planting emergent plants in the shallow water area of the wetland hydrology branch;
a3, arranging a plurality of wetland hydrological branches planted with plants between a branch estuary return water area of a dewatering river reach and a first overflowing wetland (3), and crossing a first bank slope type wetland (1) to form a first group of wetland hydrological branches (5);
a4, arranging a plurality of wetland hydrological branches planted with plants between the second overflowing wetland (4) and the branch estuary return area of the dewatering river reach, crossing the second bank slope type wetland (2) to form a second group of wetland hydrological branches (6).
2. The tidal side stream estuary water ecosystem of a post-dam dewatering estuary of claim 1, wherein the cobbles of the cobble layer have a particle size of 6cm to 8cm and a thickness of 5 cm; the thickness of the mixed soil layer is 15 cm; the thickness of the zeolite layer is 24cm, and the particle size of the zeolite layer is 2 mm-5 mm; the thickness of the volcanic rock layer is 12cm, and the particle size of the volcanic rock layer is 2 cm-5 cm; the thickness of the ceramic particle layer is 12cm, and the particle size of the ceramic particle layer is 2mm to 5 mm; the thickness of the tire particle layer is 12cm, and the particle size is 2mm to 6 mm.
3. A method for constructing a tidal side stream estuary water ecosystem of a post-dam dewatering stretch according to claim 1, wherein the method comprises the following steps:
s1, according to the current situation on two sides of the branch estuary backwater area of the dewatering estuary, performing earth excavation dam and then reducing the tidal branch estuary water ecosystem of the dewatering estuary;
s2, restoring the ecology of the tidal type branch estuary water of the post-dam dewatering estuary through the tidal type branch estuary water ecosystem of the post-dam dewatering estuary.
4. The method for constructing a tidal side stream estuary water ecosystem of a post-dam dewatering stretch of river as claimed in claim 3, wherein the step S1 comprises the following sub steps:
s11, excavating a first bank slope type wetland (1), a second bank slope type wetland (2), a first overflowing type wetland (3), a second overflowing type wetland (4), a first group of wetland hydrological branches (5) and a second group of wetland hydrological branches (6) according to current situation on two sides of a branch river mouth water return area of the dewatering river reach;
s12, constructing the first bank slope type wetland (1), the second bank slope type wetland (2), the first free flow type wetland (3), the second free flow type wetland (4), the first group of wetland hydrological branches (5) and the second group of wetland hydrological branches (6) to obtain the tidal type branch estuary water ecological system of the dewatering river reach behind the earthwork excavation dam.
5. The method for constructing the tidal type branch estuary water ecosystem of the post-dam dewatering river reach according to claim 4, wherein the method for constructing the first group of wetland hydrological branches (5) and the second group of wetland hydrological branches (6) in the step S12 comprises the following steps:
a1, excavating a plurality of wetland hydrological branches according to the current situation on two sides of a branch river mouth water return area of the dewatering river reach;
a2, planting submerged plants in the deep water area of the wetland hydrology branch, and planting emergent plants in the shallow water area of the wetland hydrology branch;
a3, arranging a plurality of wetland hydrological branches planted with plants between a branch estuary return water area of a dewatering river reach and a first overflowing wetland (3), and crossing a first bank slope type wetland (1) to form a first group of wetland hydrological branches (5);
a4, arranging a plurality of wetland hydrological branches planted with plants between the second overflowing wetland (4) and the branch estuary return area of the dewatering river reach, crossing the second bank slope type wetland (2) to form a second group of wetland hydrological branches (6).
6. The method for constructing an ecosystem of estuary water of tidal branching off and dewatering river reach of a post-dam dewatering river reach according to claim 5, wherein the submerged plants in the step A2 comprise: curly pondweed, bitter grass, potamogeton malabaricum and hornwort;
the emergent aquatic plants comprise: reed, water onion, calamus, cress and arrowhead.
7. The method for constructing the tidal branching estuary water ecosystem of the post-dam dewatering estuary of the river reach according to claim 4, wherein the method for constructing the first and second overflowing wetlands (3, 4) in the step S12 comprises the following steps:
b1, dredging a plurality of streams according to the current situation on two sides of a branch estuary return water area of the dewatering river reach;
b2, hooking and staggering a plurality of streams to form a stream characteristic wetland;
b3, performing terrace-type arrangement on the stream characteristic wetland from upstream to downstream to construct a stream terrace characteristic wetland;
b4, connecting the stream terrace characteristic wetland on one side of the branch estuary return water area of the dewatering river reach with the tail end of the first group of wetland hydrological branches (5) to form a first overflowing wetland (3);
and B5, connecting the stream terrace characteristic wetland on the other side of the branch estuary return water area of the dewatering river reach with the tail end of the second group of wetland hydrological branches (6) to form a second overflowing wetland (4).
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| JP2009299321A (en) * | 2008-06-11 | 2009-12-24 | Tokyo Seiko Co Ltd | Permeable dam |
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