CN111794176A - Self-purification type ecological layout of artificial lake constant water level slope and construction method thereof - Google Patents
Self-purification type ecological layout of artificial lake constant water level slope and construction method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention discloses a self-purification type artificial lake constant water level slope ecological layout which comprises a water source conservation catchment area, a shallow water level floating leaf plant purification area, a slope amphibian plant decoration area, a lake surrounding ecological recreation and appreciation scenic area and a constant water level pollutant intercepting area. Wherein, the water source conservation catchment area is positioned at the upstream of the water source and plays a role in water source conservation by planting wetland plants; the shallow water level floating leaf plant purification area is usually below the normal water level, and lake water is purified and decontaminated by planting floating leaf plants; the slope amphibian plant interspersing area is above the water line; surrounding lake ecological recreation and appreciation scenic spot is located at the top of a slope and around the lake, and peripheral landscapes are elaborately built by planting landscape trees and landscape shrubs; and a constant water level pollutant intercepting dam is built at the downstream water outlet to ensure the constant water level of the artificial lake and the interception of pollutants. The technical scheme of the invention not only plays an important role in water source cleaning and ecological improvement of the artificial lake region through elaborate construction and plant design, but also has the remarkable characteristics of ecology, green supplement, three-dimensional and synergy.
Description
Technical Field
The invention relates to an ecological layout and construction method of a self-cleaning type artificial lake constant water level slope surface, and belongs to the technical field of urban landscaping and landscape construction.
Background
Along with the rapid development of the economy and the increasingly accelerated urbanization process of China, the creation of the urban and rural environmental landscape draws more and more attention of people. Particularly, as the number of urban population is increased, buildings are more and more dense, and the limitation of urban garden green space is increasingly prominent. The method is suitable for compact water bank greening, can not only be used for landscaping and strip and block separation, but also achieve special effects of ecological restoration and landscape diversification, increase the green quantity in a very limited urban space, and provide a fresh, excellent and new aesthetic feeling for local residents and passers-by.
CN2019105642110 provides a multifunctional river bank biodiversity maintaining structure, which comprises a large emergent aquatic plant purifying area, a shoal wading bird feeding area, a porous block mollusk inhabiting area, a near-shore sightseeing leisure viewing area and a multi-level forest beneficial bird attracting area which are sequentially arranged from the water to the bank. This slope protection structure can ensure the firm soil of bank protection on the one hand, the anticorrosion safety, and on the other hand still can provide profitable living environment for aquatic animals and plants, birds, plays soil and water conservation, maintains biological diversity's multiple effect.
CN201820843912.9 discloses a saline and alkaline land artificial lake ecotype is waterproof to subtract and oozes structure, this structure includes that first aquatic plant plants district, second aquatic plant plants district and land bank protection district that distribute in proper order from low to high, first aquatic plant plants district, second aquatic plant plants district and land bank protection district all include lake bottom plain soil tamped layer, anti-hydrophobicity soil solidification layer, geotechnological cloth layer, clay layer and planting soil overburden layer from lower supreme in proper order, lake bottom plain soil tamped layer is excavated the plain soil recess in the upper end in land bank protection district, anti-hydrophobicity soil solidification layer, geotechnological cloth layer extend in proper order and lay in the plain soil recess, have placed the cobble on the geotechnological cloth layer that is located in the plain soil recess, the clay layer is higher than normal water level 100mm in the compaction elevation that the laying of land bank protection district extends to the clay layer. The utility model discloses whole way advantage: the method has the advantages of double permeability reduction and stability, strong ecological operability of the method, simple process, low manufacturing cost and harmony with nature.
CN201510076167.0 discloses a construction method of an artificial lake water ecosystem, which comprises the following steps: constructing an aquatic plant community through a vertical structure design and a horizontal structure design; and constructing an aquatic animal community; the water ecosystem is perfected by the carbon fiber ecological grass, the solar water flow aeration device, the solar water flow circulating device and the intermittent circulating oxygenation device. The invention enhances the self-purification capacity of lake water through ecological engineering, improves the biodiversity level, finally forms a stable and virtuous cycle water ecological system and maintains the quality of lake water. In addition, the invention utilizes the water ecosystem with reasonable structure and certain self-purification capability to maintain the water quality of the artificial lake, has no adverse effect on the environment, and meets the times theme and requirement of green and low carbon.
The traditional lake surface greening structure is single in type, mostly adopts a pure hard structure or a cement retaining wall, water-resistant trees are simply planted on the periphery of the lake surface greening structure, slope greening and structural layout are rigid and stiff, and the landscape effect is not ideal. The simple lake surface structure and the slope protection layout can not meet the limited control of lake water accumulation, waterlogging is caused by the full flood season, and aquatic fishes cannot survive and propagate because of being dry in winter. More importantly, the traditional lake slope pursues firmness and corrosion resistance one by one, can not provide living and breeding space and conditions for water-bank animals and plants, is difficult to maintain biological diversity, is not beneficial to water and soil conservation and the requirement of modern cities on environment beautification, and is also not beneficial to the long-term stability and health of urban ecosystems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art, and provides a self-cleaning type artificial lake constant water level slope ecological layout and construction method to meet the requirements of urban water surface environment modification and lake slope landscape improvement in the current urbanization process of China and meet the actual requirements of biodiversity protection and garden diversification in urban development.
The technical scheme is as follows: in order to solve the technical problems, the invention provides a self-cleaning type constant water level slope ecological layout of an artificial lake, which comprises 5 parts, namely a water source conservation catchment area, a shallow water level floating leaf plant purification area, a slope amphibian plant decoration area, a lake surrounding ecological recreation scenic area, a constant water level pollutant intercepting area and the like.
The water source conservation catchment area is located at a higher place, is the upstream of the water source of the artificial lake, receives the rainwater confluence in the summer flood season, and plays a role in water source conservation through planting wetland plants; the shallow water level floating-leaf plant purification area purifies and decontaminates lake water by planting floating-leaf plants and has the function of landscape improvement; the slope surface amphibian plant interspersing area is above the normal water line, and the slope surface is consolidated, corroded and biodiversity maintained through proper geotechnical structures and amphibian plant planting; the peripheral landscape is elaborately built by planting landscape trees and ornamental shrubs at the edge of the peripheral recreation road of the lake surrounding the ecological recreation and appreciation scenic region at the top of the living slope; and a constant water level pollutant intercepting area is constructed downstream to ensure constant water level and pollutant interception of the artificial lake.
The vegetation buffer zone is constructed by planting aquatic plants in the water source conservation catchment area (I), the selected aquatic plants comprise Thymus chinensis, Scirpus validus, gladiolus glaucophyllus, Trapa nigra, wild rice and the like, the planting mode is cluster-shaped natural planting, and the planting density is 15-20 plants/m2And water-resistant herbs such as pulchrous myriophyllum, rhizoma alismatis, carex taraxacum, dwarf pampas grass, reed canary grass and the like are planted among planting gaps, and the water-soil conservation effect is achieved.
The shallow water level floating-leaf plant purification area is below the normal water level, the plants such as water lily, potamogeton glabra, Xincai, water caltrop and the like are selected, the planting mode is in a point configuration, and the planting density is 10-15 plants/m2And naturally increasing plants in later period.
The slope amphibious plant decorative area is paved with special slope protection bricks from bottom to top along the water line, and soft and hard combination and biological consideration are achieved through the amphibious plant, so that conditions are created for maintaining biological diversity of the lake bank.
The slope protection brick is of a polyhedral structure and has directionality, the width of the left side surface is 18cm, the width of the right side surface is 9cm, the width of the upper side surface and the lower side surface is 9cm, the width of the side surfaces of four corners is 9cm, and a cube hole with the side length of 7cm is reserved in the middle.
The slope protection brick is 10-12 cm thick, and the bottom is equipped with 3 semicircular biological bridges in cross-section, and the biological bridge is violently placed in slope protection brick bottom, and the large-scale biological bridge top in central authorities communicates with each other with the square hole, is convenient for aquatic plant root system intergrowth, and the small-size biological bridge in both ends provides habitat space and migration passageway for the mollusk (such as earthworm, mainland, snail etc.) at slope bottom.
The amphibious plants are selected from amphibious knotweed, cuckoo-bud, iris, sowthistle and the like and planted in square holes of slope protection bricks.
The landscape arbor in the lake surrounding ecological recreation and appreciation region is one or the combination of more than two of metasequoia, pond fir and larch; the shrub is one or more of shrubalthea, flos Caryophylli, flos Hibisci Mutabilis, and radix Dichroae. And carrying out mixed and spaced construction on landscape trees and ornamental shrubs.
The constant water level pollutant intercepting area is located on one side of the downstream of the artificial lake, a dam is built, the dam naturally shrinks upwards from the bottom, the top of the dam is built flat, and a water level control gate is reserved on one side of the dam.
The water level control gate is of a dustpan type, the front end of the water level control gate is close to a water body and is designed into a constant water level retaining wall, gate walls are arranged on two sides of the water level control gate to support the gate, the rear end of the water level control gate is designed into a gate top and a water outlet, and a fence is fixed on the water outlet and used for intercepting solid pollutants.
The water level control gate retaining wall is of a concrete structure, the width of the retaining wall is 4.5-6 m, the width of the water outlet is 3.5-4 m, the height of the water outlet is not less than 2m, and smooth water flow in flood seasons is guaranteed.
The ecological layout and construction method of the self-cleaning type artificial lake constant water level slope surface is characterized in that the width of the gate top of the water level control gate is equal to the width of a lake-periphery rest road.
The invention further provides a construction method of the ecological layout of the constant water level slope of the self-cleaning artificial lake, which comprises the following steps:
the method comprises the following steps: trimming a slope, removing impurities, and dividing a water source conservation catchment area, a shallow water level floating leaf plant purification area, a slope amphibious plant decoration area, a lake surrounding ecological recreation area and a constant water level pollutant intercepting area according to water level, wherein the water source conservation catchment area is located at a high position and is an upper stream of an artificial lake water source, the shallow water level floating leaf plant purification area is arranged at a shallow water level, the slope amphibious plant decoration area is above a normal water level line and is arranged on the slope, the lake surrounding ecological recreation area is located at the top of the slope and is at the periphery of a lake recreation road, and the constant water level pollutant intercepting area is built at a lower stream;
step two: paving slope protection bricks on the slope amphibian plant interspersing area from bottom to top along the water line, and planting amphibian plants;
step three: planting aquatic plants in the water source conservation catchment area;
step four: building a water level control gate in a constant water level pollutant intercepting area to construct a dam;
step four: planting floating-leaf plants in a shallow water level floating-leaf plant purification area, and discharging water into a storage pool;
step five: and (4) constructing a landscape for the ecological recreation scenic spot around the lake and planting trees around the lake.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) according to the method, an ecological niche principle is introduced into urban lake slope construction engineering, green plants with different biological characteristics are planted through pattern division and function division according to local conditions, and an ingenious configuration measure is used for creating a pattern structure which is compact in structure, complementary in advantages, environment-friendly and beneficial to growth and settlement of garden plants for the urban artificial lake slope;
(2) the method can effectively overcome the defects that the slope surface of the current urban artificial lake is too high in hardness, the plants are difficult to survive and the landscape is too single-plate, creates a microenvironment for the survival of landscape plants on the premise of ensuring the ecological protection function, is beneficial to the growth and the reproduction of various aquatic plants, improves the slope surface greening rate and beautiful landscape degree and realizes the diversification of the landscape of the urban artificial lake;
(3) the method overcomes the defects that the traditional artificial lake surface structure is stiff, the lake water control is limited and the environment pollution is easy to cause, creatively designs the constant water level pollutant intercepting dam and the water level control gate, and ensures that the lake water level is uniform throughout the year, is not flooded in the flood season and is not dry in the dry season.
Drawings
FIG. 1 is a view of the overall structure of the artificial lake slope;
FIG. 2 is a top view of a slope protection brick structure;
FIG. 3 is a side view of a slope protection brick structure;
FIG. 4 is a schematic view of a slope protection brick splicing structure;
FIG. 5 is a schematic view of a water level control gate.
Detailed Description
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
As shown in figure 1, the self-purification artificial lake constant water level slope ecological layout and construction method comprises a water source conservation catchment area I, a shallow water level floating leaf plant purification area II, a slope amphibian plant decoration area III, a lake surrounding ecological recreation scenic area IV and a constant water level pollutant interception area V.
The water source conservation catchment area I is located at a higher place of the terrain, is an upper part of a water source of an artificial lake, receives rainwater in summer flood season for confluence, and plays a role in water source conservation through planting wetland plants; the shallow water level floating leaf plant purification area II is used for purifying and decontaminating lake water by planting floating leaf plants 4 and has the function of landscape improvement; the slope amphibian plant interspersing area III is above the normal water line, and the slope is subjected to consolidation corrosion prevention and biological diversity maintenance through a proper geotechnical structure and amphibian plant planting; IV, surrounding lake ecological recreation and appreciation scenic region is located at the edge of a peripheral recreation path of a slope top lake, and peripheral landscapes are elaborately constructed by planting landscape trees and ornamental shrubs; and a constant water level pollutant intercepting area V is constructed at the downstream, so that the constant water level and pollutant interception of the artificial lake are ensured.
Wherein, the water source conservation catchment area I is used for constructing a vegetation buffer zone by planting aquatic plants and selectingThe aquatic plants comprise recurring flowers, allium mongolicum regel, gladiolus, candelilla, black water caltrop, wild rice and the like, the planting mode is cluster-shaped natural planting, and the planting density is 15-20 plants/m2And water-resistant herbs such as pulchrous myriophyllum, rhizoma alismatis, carex taraxacum, dwarf pampas grass, reed canary grass and the like are planted among planting gaps, and the water-soil conservation effect is achieved.
Wherein the shallow water floating-leaf plant purification area II is below the normal water level, and is prepared from water lily, potamogeton glabra, Xinjiang, water caltrop, etc., and has a planting mode of dot configuration and a planting density of 10-15 plants/m2And naturally increasing plants in later period.
And a specially-made slope protection brick 6 is laid in the slope amphibian plant interspersing area III from bottom to top along a water line, and the combination of hardness and softness and biological consideration are achieved through the amphibian plants, so that conditions are created for maintaining the biological diversity of the lake bank.
The slope protection brick 6 is of a polyhedral structure and has directionality, the left side surface and the right side surface are 8cm wide and 18cm wide, the upper side surface and the lower side surface are 9cm wide, the four corners are 11 cm wide and 9cm wide, and a square hole 10 with the side length of 7cm is reserved in the middle.
The slope protection brick 6 is 10-12 cm thick, 3 biological bridges 12 and 13 with semicircular sections are arranged at the bottom of the slope protection brick, the biological bridges 12 and 13 are transversely arranged at the bottom of the brick body, the top of the central large biological bridge 13 is communicated with the square hole 10, root systems of aquatic plants can grow symbiotically, and the small biological bridges 12 at the two ends provide inhabitation spaces and migration channels for mollusks such as earthworms, hippopotamus, snails and the like at the bottom of the slope.
Wherein the amphibious plants are selected from amphibious knotweed, cuckoo-bud, iris, bitter grass and the like and planted in the square holes 10 of the slope protection brick 6.
Wherein, the landscape arbor 1 of the lake-surrounding ecological recreation and appreciation region IV is one or the combination of more than two of metasequoia, pond fir and larch; the shrub 1' is one or more of shrubalthea, flos Caryophylli, flos Hibisci Mutabilis, and radix Dichroae. The landscape arbor 1 and the ornamental shrub 1' are mixed and constructed at intervals.
Wherein, the constant water level pollutant intercepting area V is positioned at one side of the downstream of the artificial lake, a dam 2 is built, the dam naturally shrinks upwards from the bottom, the top is built to be flat, and a water level control gate 3 is arranged at one side.
The water level control gate 3 is of a dustpan type, the front end of the water level control gate is close to a water body and is designed to be a constant water level retaining wall 14, the two sides of the water level control gate are gate walls 15 and support the gate, the rear end of the water level control gate is designed to be a gate top 16 and a water outlet 17, and a fence is fixed on the water outlet 17 and used for intercepting solid pollutants.
The water level control gate 3 retaining wall 14 is of a concrete structure, the width of the retaining wall is 4.5-6 m, the width of the water outlet 17 is 3.5-4 m, and the height of the water outlet 17 is not less than 2m, so that smooth water flow in flood season is ensured.
Wherein, the width of the gate top 16 of the water level control gate 3 is equal to the width of a lake circumambulation rest path.
The construction steps of the ecological layout of the constant water level slope surface of the self-cleaning artificial lake are as follows:
the method comprises the following steps: trimming a slope, removing impurities, and dividing a water source conservation catchment area I, a shallow water level floating leaf plant purification area II, a slope amphibian plant decoration area III, a surrounding lake ecological recreation scenic area IV and a constant water level pollutant interception area V according to water levels, wherein the water source conservation catchment area I is located at a high position and is an artificial lake water source upstream, the shallow water level floating leaf plant purification area II is arranged at a shallow water level, the slope amphibian plant decoration area III is arranged above a normal water level line and is arranged on the slope, the surrounding lake ecological recreation scenic area IV is located at the edge of a surrounding recreation road of a slope top lake, and the constant water level pollutant interception area V is built at the downstream;
step two: paving slope protection bricks 6 on the slope amphibian plant interspersing area III along the water line from bottom to top, and planting amphibian plants;
step three: planting aquatic plants in the water source conservation catchment area I;
step four: building a water level control gate 3 in the constant water level pollutant intercepting area V to construct a dam;
step four: planting floating-leaf plants in a shallow water level floating-leaf plant purification area II, and discharging water into a storage pool;
step five: and D, constructing a landscape in the ecological recreation scenic area IV around the lake, and planting trees around the lake.
The invention provides a thought and a method for an urban inland river ecological appreciation revetment structure, and a plurality of methods and ways for realizing the technical scheme are provided, the above description is only a preferred embodiment of the invention, and it should be noted that for a person skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the invention, and the improvements and decorations should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. A self-cleaning type artificial lake constant water level slope ecological layout comprises a water source conservation catchment area (I), a shallow water level floating leaf plant purification area (II), a slope amphibian plant decoration area (III), a surrounding lake ecological recreation and appreciation area (IV) and a constant water level pollutant interception area (V),
the water source conservation catchment area (I) is located at a high place, is an artificial lake water source upstream, receives rainwater in summer flood season and converges, and plays a role in water source conservation through planting wetland plants; the shallow water floating leaf plant purification area (II) purifies and decontaminates lake water by planting floating leaf plants (4), and has landscape improvement function; the slope amphibian plant interspersing area (III) is above the normal water line, and the slope is subjected to consolidation corrosion prevention and biological diversity maintenance through the geotechnical structure and amphibian plant planting; the lake surrounding ecological recreation and appreciation scenic region (IV) is positioned at the edge of a recreation path around the lake on the top of the slope, and the surrounding landscape is built by planting landscape trees and ornamental shrubs; and a constant water level pollutant intercepting area (V) is constructed downstream and used for keeping the water level of the artificial lake constant and intercepting pollutants.
2. The self-cleaning artificial lake constant water level slope ecological layout as claimed in claim 1, wherein the water source conservation catchment area (I) is formed by planting aquatic plants to construct vegetation buffer zone aquatic plants, the aquatic plants comprise any one of Thalictrum aquilegifolium, Scirpus tabularis, gladiolus glauca, Mitsubishi black water caltrop and Zizania latifolia, the planting mode is cluster-shaped natural planting, and the planting density is 15-20 plants/m2Water-resistant herbaceous plants are planted in the planting gaps, and the water-resistant herbaceous plants have the water and soil conservation effect.
3. The ecological layout of constant water level slope of self-cleaning artificial lake as claimed in claim 1, wherein the shallow water level floating-leaf plant purification area (II) is below the normal water level, the floating-leaf plants are selected from any one of water lily, potamogeton glabra, Xincai and water caltrop, the planting mode is a dotted configuration, the planting density is 10-15 plants/m2And naturally increasing plants in later period.
4. The ecological layout of the self-purification artificial lake constant water level slope surface according to claim 1, wherein slope surface slope protection bricks (6) are laid in the slope surface amphibian plant decoration area (III) from bottom to top along the water line, and soft and hard combination and biological consideration are achieved through amphibian plants, so that conditions are created for maintaining biological diversity of the lake bank.
5. The ecological layout of the self-cleaning artificial lake constant water level slope surface as claimed in claim 4, wherein the slope surface slope protection bricks (6) are of a polyhedral structure and have directionality, the left and right side surfaces (8) are 18-20 cm wide, the upper and lower side surfaces (9) are 9-10 cm wide, the four corner side surfaces (11) are 8-9 cm wide, and a cube hole (10) with the side length of 7-8 cm is reserved in the middle; domatic slope protection brick (6) thickness 10~12cm, the bottom is equipped with 3 semicircular biological bridges in cross-section (12, 13), and biological bridge (12, 13) are horizontal in slope protection brick (6) bottom, and central authorities' macrobiosis bridge (13) top communicates with each other with square hole (10), and the aquatic plant root system intergrowth of being convenient for, and the small-size biological bridge in both ends (12) then provide habitat and migration passageway for the mollusk of domatic bottom.
6. The ecological layout of the self-cleaning artificial lake constant water level slope surface as claimed in claim 4, wherein the amphibious plants comprise one or more of amphibious knotweed, cuckoo-bud, iris and eel grass, and are planted in the square holes (10) of the slope protection bricks (6).
7. The ecological layout of the self-cleaning artificial lake constant water level slope surface as claimed in claim 1, wherein the landscape arbor (1) of the ecological recreation and appreciation area (IV) surrounding the lake is any one or a combination of more than two of metasequoia, pond fir and larval fir; the ornamental shrub (1 ') is one or the combination of more than two of hibiscus, clove, cotton rose and Hibiscus hirsutus, and the landscape arbor (1) and the ornamental shrub (1') are constructed in a mixed and spaced mode.
8. The ecological layout of the constant water level slope of the self-cleaning artificial lake as claimed in claim 1, wherein the constant water level pollutant intercepting area (V) is located at one side of the downstream of the artificial lake, a dam (2) is built, the dam is naturally contracted upwards from the bottom, the top is built flat, a water level control gate (3) is left at one side, the water level control gate (3) is of a dustpan type, the front end is close to the water body and is designed as a constant water level retaining wall (14), gate walls (15) are arranged at two sides, the gate is supported, the rear end is designed as a gate top (16) and a water outlet (17), and a fence is fixed at the water outlet (17) and used for intercepting solid pollutants.
9. The ecological layout of the self-cleaning artificial lake constant water level slope surface as claimed in claim 8, wherein the retaining wall (14) and the gate wall (15) of the water level control gate (3) are of a concrete structure, the width is 4.5-6 m, the width of the water outlet (17) is 3.5-4 m, and the height of the water outlet (17) is not less than 2m, so as to ensure smooth water flow in flood season; the width of the gate top (16) of the water level control gate (3) is equal to the width of a rest path around the lake.
10. A construction method of ecological layout of a constant water level slope of a self-cleaning artificial lake is characterized by comprising the following steps:
the method comprises the following steps: trimming a slope, removing impurities, and dividing a water source conservation catchment area (I), a shallow water level floating leaf plant purification area (II), a slope amphibian plant decoration area (III), a ring lake ecological recreation scenic area (IV) and a constant water level pollutant interception area (V) according to water levels, wherein the water source conservation catchment area (I) is arranged at a high position and is an upper part of a water source of an artificial lake, the shallow water level floating leaf plant purification area (II) is arranged at a shallow water level, the slope amphibian plant decoration area (III) is arranged above a normal water level line and is arranged on the slope, the ring lake ecological recreation scenic area (IV) is arranged at the edge of a recreation road around a slope top lake, and the constant water level pollutant interception area (V) is built at a lower part;
step two: paving slope protection bricks (6) on the slope amphibian plant interspersing area (III) from bottom to top along a water line, and planting amphibian plants;
step three: planting aquatic plants in the water source conservation catchment area (I);
step four: building a water level control gate (3) in the constant water level pollutant intercepting area (V) to construct a dam;
step four: planting floating-leaf plants in a shallow water level floating-leaf plant purification area (II), and discharging water into a storage tank;
step five: and (4) constructing a landscape in the ecological recreation scenic region (IV) of the lake surrounding and planting lake surrounding trees.
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