256 results about "Tidal flat" patented technology

The invention discloses a hydro-fluctuation belt wetland vegetation restoration proper species screening method. The method includes: investigating region vegetation, and preliminarily selecting species suitable for region vegetation restoration from the aspects of life form and growth form of species; adopting a soil seed bank germination experiment to screen to obtain omissive proper plants; inferring proper plants for vegetation restoration of a hydro-fluctuation belt according to vegetation investigation on the hydro-fluctuation belt and the soil seed bank germination experiment of the same; performing a waterlogging tolerance experiment on the proper plants, and screening proper species for region vegetation restoration; according to waterlogging tolerance and region hydrologic changing characteristics, arranging the proper species obtained by screening, and conducting practice demonstration of vegetation restoration. The method is conducive to preventing genetic drift caused by gene flow and maintaining a gene bank of local species stable, less prone to causing intrusion of foreign species and provides technical support and scientific guidance for large-area demonstration and popularization of vegetation restoration in regions like reservoir hydro-fluctuation belts, riparian zones and tidal flat wetland.

The invention relates to the technical field of the breeding of shellfish seedlings, in particular to an artificial breeding method for Mactra chinensis. Through the combination of artificial ripening and ecological ripening of parents, the development of sex glands is regularly detected to determine the mature period of the sex glands of the parents; methods such as shade drying, water flowing and so on, are adopted to stimulate the spawning and spermiation of the parents to obtain fertilized eggs, and D larvae are obtained through the embryonic development; and on this basis, larva breeding, larva metamorphosis and juvenile shellfish cultivation are performed. A large amount of Mactra chinensis seedlings can be obtained through the links. The method breaks through an artificial breeding technology of the Mactra chinensis, solves the problem of the breeding of the Mactra chinensis seedlings that fails to be broken through for a long time, and lays a solid foundation for the development of cultivation and proliferation of native species, the resource recovery of shallow seas and tidal-flat areas, and the maintenance of biological diversity. The method has the characteristics of simple and convenient operation and high practicality.

The invention relates to a technique for the forestation of Chinese tamarisk on coastal tidal flats. According to the technical scheme of the invention, the technique comprises the following technological steps: (1) cultivating the shoot of Chinese tamarisk on plots with the salt content thereof being 0.3% to 0.6% by using the cutting propagation method; (2) transplanting the shoot of Chinese tamarisk to flowerpots or other containers to cultivate the container seedling of Chinese tamarisk, wherein the salt content of soil in the container is approximately 1.0% and no higher than 1.2%; (3) transplanting the ball-plant container seedling of Chinese tamarisk with the complete root system to the coastal tidal flats by proper density, wherein according to the conditions for selecting the coastal tidal flats, the coastal tidal flats can be immersed in seawater for a short time instead of immersed continuously for a plurality of days, and the salt content of the tidal flat soil is no higher than 3.0%. The invention has the following beneficial effects: by using the container seedling method, the invention guarantees the complete root system of Chinese tamarisk during the transplanting process, thereby avoiding the effect of root cutting and further increasing the survival rate of forestation of Chinese tamarisk under the condition that the salt content is high. Therefore, the technique is particularly suitable for the actual conditions in the area of coastal tidal flats short of freshwater resources.

The invention relates to a method of controlling the invasion of spartina alterniflora and restoring the ecological environment of mangrove by adopting the sonneratia apetala. The method is characterized by the steps: (1) pretreating the tidal flat of the spartina alterniflora invasion according to the requirement; (2) preparing the nursery stock of the sonneratia apetala; (3) planting the nursery stock of the sonneratia apetala according to the site condition and the thickness of the spartina alterniflora; (4) supporting and fixing the planted nursery stock; (5) pruning the undergrowth spartina alterniflora and planting the native mangrove after the crown closure and the fade-away or the complete fade-away of the spartina alterniflora. The spartina alterniflora starts the crown closure after a plantation of 1-1.5 years, the native mangrove including bruguiera gymnorrhiza and kandelia candel in the undergrowth of the spartina alterniflora can be planted after the sonneratia apetala gradually recesses to promote the formation of the community of rich biodiversity. The method adopts the fast-growing pioneer species of the sonneratia apetala to compete with the spartina alterniflora for fertilizer, water and sunlight, so as to cause the spartina alterniflora decline or death. The adopted sonneratia apetala has long growth period, large biomass, high stress resistance, easy plantation and good weed-suppressive effect.

The invention discloses a solidifying material for marine dredging and tidal flat sludge. The solidifying material comprises slag micropowder, fly ash, cement, calcium oxide, citric acid waste gypsum, lignin, an activator and an active deodorizing agent. The technical problem solved by the present invention is that: the sludge solidifying material is added to the marine dredging and tidal flat sludge during stirring, such that the problem of solidification and engineering utilization of the marine dredging and tidal flat sludge is solved. With the solidifying material for the marine dredging and tidal flat sludge provided by the present invention, the waste gypsum, the slags, the sawdust and other industrial and mining waste materials are completely utilized as the fillers and the addition agents for solidifying the marine sludge, such that the mechanical property, the building practicality and the environmental protection performance of the solidified product of the marine sludge areensured, and the complete and rational utilization of the natural sludge and the industrial waste material is realized.

The invention discloses a telemetering method for quick tidal wetland terrain measurement. The telemetering method comprises the steps of building more than two water level telemetering stations in a measured tidal wetland and relevant water domains, constructing a water level observation base line and a water level telemetering station network along the longitudinal direction of the measured water domain so as to perform real-time water level monitoring, and constructing observation water level lines at different time synchronous with an acquired telemetering image; acquiring multi-source and multi-temporal satellite telemetering image data of the monitored region, and extracting telemetering flowage lines at different water levels; performing synchronous water level assignment on each flowage line point on each telemetering flowage line, and constructing three-dimensional telemetering flowage lines; and constructing a tidal flat digital terrain model on the basis of a series of the three-dimensional telemetering flowage lines to finally finish the tidal wetland terrain map of a monitored region. According to the tidal terrain innovation method on the basis of satellite telemetering and a hydrologic network, the difficulty in conventional manual measurement on foot, shipborne radar field measurement and modern aerial radar measurement is overcome; the height accuracy of terrain measurement reaches the centimeter level.

The invention discloses a silt tidal flat topography evolution method based on an oblique photographing three-dimensional reconstruction technology. The silt tidal flat topography evolution method comprises the following steps: planning an air route of an unmanned aerial vehicle in a target measurement region of a tidal flat and distributing and uniformly driving positioning piles in the region; fixing a flying disc on the piles to be used as a control point; carrying out static data acquisition on the control point by adopting a GPS (Global Positioning System); acquiring aerial photographs ofthe region by utilizing the unmanned aerial vehicle; generating a point cloud and an ortho-image of the region through the photographs photographed by the unmanned aerial vehicle by utilizing three-dimensional modeling software; identifying a water ponding region from the ortho-image and eliminating the water ponding region from point cloud data; coupling acquired static data into the processed point cloud data and establishing a three-dimensional model of the region, so as to obtain tidal flat elevation information of the region; verifying model errors by utilizing a Rod-SET system; carryingout periodic monitoring modeling on the same region, so as to monitor scour and silting evolution of the region. The silt tidal flat topography evolution method disclosed by the invention has the beneficial effect that the elevation precision of topography measurement reaches a centimeter grade.

The invention discloses an ocean tidal flat original ecology raising method. The method includes: enclosing, building fields, releasing and tending on a coastal tidal flat. Enclosing includes: enclosing a raising area with a double-layer overall-sealed fence with typhoon-resisting and anti-escaping functions so as to perform all-weather protection. Building fields, namely a raising area ecological environment includes: building a fry nursing field, a feeding field, an inhabit field and an overwintering field. Releasing includes: manually releasing large economical organism varieties and artificially raising and breeding tidal flat aquatic organisms so as to build a raising area natural ecology system. Tending includes: allowing for natural fry nursing, natural feeding, natural pollution discharge and natural growth of the tidal flat organisms in the raising area natural ecology system. Dynamic balancing management is implemented according to the change of natural environments and relations among organism groups. The method is low in investment, high in yield, simple and practical, relative balance of environmental protection and resource utilization is achieved, ocean aquatic resources decreasing year by year are repaired, and harmonic development of man and nature is achieved.

The invention discloses a physical model testing system and method for landform evolution of a tidal flat-tidal creek system, and belongs to the technical field of landform evolution tests of the tidal flat-tidal creek system. A physical model comprises a tidal flat-tidal creek simulation area, a water circulation system, a water level measurement and control system and a microrelief laser scanner, and can realistically simulate a tidal flat-tidal creek landform evolution process of a coastal zone. The development and evolution rules of the tidal flat-tidal creek system and the change rules of the flow velocity with the water depth are obtained by acquiring tidal flat-tidal creek topographic data of all testing stages, a preset water level process and an actual water level process of a tidal flat-tidal creek simulation zone and trace particle movement images recorded by a camera in a testing process.

The invention involves a method of disposing the alkali of drain basin beach and belongs to a three-dimensional disposing method using the laying pipe to discharging alkali and salt. The invention mainly resolves the technical difficulties of depth shallow, easy to choking and caving-in collapse, the effects of discharging alkali and salt poor in the prior method.The technical schemes used in the invention are: a disposing the alkali of drain basin beach method includes the following steps : a. machining sieve meshes on the hollow tubes firstly; b. binding net bags on the surface of hollow tubes machined sieve meshes; c. burying main pipes in the drain basin beach lands, the depth is 1.7-2.2m; d. digging a canal to burying the hollow tubes every 5~10m in the drain basin beach lands, then putting hollow tubes in and laying fine sands around the hollow tubes to packing the hollow tubes, one end of every hollow tubes are linked with main pipes; e. equipping vertical tubes and sluice valves which can control the water level on the main pipes in order to controlling the water level in the suitable area for plant growth.

The invention provides an ecological planting and raising method for rapidly desalting saline-alkaline soil of a coastal tidal flat. The method comprises the steps of planting saline-alkaline-tolerant forage grass on the saline-alkaline soil of the coastal tidal flat, harvesting the forage grass for feeding domestic animals, and returning manure generated from the domestic animals to fields as an organic fertilizer. The structure of vegetation of saline-alkaline land is adjusted through planting the saline-alkaline-tolerant forage grass, saline matter ions in the soil are absorbed and transferred by using physiological functions and roots of the forage grass, high-quality forage grass is harvested for feeding the domestic animals such as cattle and sheep, livestock-and-poultry manure generated from domestic-animal raising is prepared into the organic fertilizer, and the organic fertilizer returns to the fields and then can play roles in amending and fertilizing the saline-alkaline soil.

The invention discloses a pot culture process method of a mangrove plant, comprising the steps as follows: a double-layer flowerpot consisting of a transparent externally sleeved flowerpot and a built-in flowerpot is created, tidal flat soil is filled in the built-in flowerpot as growing base, the mangrove plant seedling or the intact embryo is planted in the growing base, the artificial seawater is filled in the flowerpot for culturing the mangrove seedling or the embryo, the artificial seawater is filled in and discharged from the flowerpot per day for culture management of the planted mangrove plant pot by simulating the ebb and flow law of the semi-diurnal tides, and aerating roots are guided and shaped into the required appearance when the mangrove plant grows and forms well-developed aerating roots in the externally sleeved flowerpot. The pot culture process method successfully transplants the mangrove plant into the room for culture and develops into the pot art, combines the indoor air purifying functions with the aesthetic values of the mangrove plant and plays an important role in creating a healthy and comfortable lifting environment for people.

The invention relates to organic fertilizer special for soil of tidal flat and saline-alkaline land and a preparation method and application thereof. The organic fertilizer comprises, by mass, 85-90 parts of cow dung, 5-10 parts of crop straw, 2 parts of calcium sulfate and 3 parts of charcoal. The technical bottleneck in quick improvement of the soil of the tidal flat and the saline-alkaline land is solved effectively; the special organic fertilizer is prepared from the cow dung, the crop straw, calcium sulfate and charcoal, so that formation of tidal flat soil aggregate can be facilitated effectively, soil resalinization can be reduced, pH can be lowered, organic matters and nutrients like N and P of the soil can be increased, structural improvement and fertilization of the soil of the tidal flat and the saline-alkaline land are promoted effectively, and a guarantee is provided for increasing agricultural cultivated land reserves of China.

The invention discloses a mangrove plant big seedling transplantation protective cover and application thereof. The protective cover is barrel-shaped and is provided with no cover on the top or at the bottom, wherein the periphery of the cover body consists of a bamboo net; the interior of the cover body is fixedly arranged on the inner side of the bamboo net by using a plurality of fixing rods; and when the protective cover is used, the protective cover is sleeved from the space above a plant, and all the fixing rods and the bamboo net are partially implanted into soil. According to the mangrove plant big seedling transplantation protective cover, the impact of tide on a tree seedling can be reduced, bottom mud can be effectively prevented from being hollowed out by the tide, the survival rate of afforestation can be improved, particularly, the manual working time on tidal flat can be saved, and the resource is saved. The protective cover is made of a natural material, so that secondary pollution caused by an artificial synthetic material can be avoided, and the manual disassembly cost can be reduced through automatic rotting. The protective cover has the advantages of simple structure, low cost and convenience in use.

The invention relates to the technical field of seawater ecological breeding, in particular to a double-circulation seawater prawn comprehensive breeding system. The system comprises a prawn breedingpond, a sludge treatment tank, a first-stage surface flow constructed wetland, a second-stage composite vertical flow constructed wetland, a shellfish and alga biological filter and a reservoir, wherein the prawn breeding pond, the sludge treatment pond, the first-stage surface flow constructed wetland, the second-stage composite vertical flow constructed wetland and the reservoir are sequentiallycommunicated; the shellfish and alga biological filter is in parallel connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland, and is also in serial connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland; secondary deep treatment can be carried out when necessary, economical tidal flat crabs and tidal flat fishes are bred in the sludge treatment tank, and filter-feeding fishes, shellfishes and snails are bred in the first-stage surface flow constructed wetland. The system can effectively filter away residual bait, excrement and the like in prawn breeding discharged water, can purify nitrogen, phosphorus and other pollutants, has good ecological benefits, is low in overall energy consumption and saves energy.

The invention discloses a method for preparing water-permeable bricks and belongs to the technical field of preparation of building materials. The method comprises the steps of sieving tidal-flat mud, drying the sieved mud in the air, then, mixing the dried mud with deionized water, carrying out centrifugation and separation, collecting tidal-flat sand, drying so as to prepare dried tidal-flat sand granules, adding bentonite and the like into the dried tidal-flat sand granules, carrying out ball milling so as to obtain mixed ball-milled powder, mixing the mixed ball-milled powder with water glass, standing so as to obtain curing pug, carrying out compression molding and demolding so as to obtain a cold-pressed semifinished material, carrying out ball milling on quartz and the like, sieving so as to obtain ball-milled glaze powder, carrying out ultrasonic dispersion treatment with a polyvinyl alcohol solution and the like, then, soaking the cold-pressed semifinished material in the dispersion, taking out the semifinished material, drying, and then, carrying out preheating, heat insulation and calcination in a tunnel kiln, thereby preparing the water-permeable bricks. The method has the beneficial effects that preparation steps of the method are simple, and the obtained water-permeable bricks are good in water-permeable durability, have the coefficient of water permeability of 5.78*10<-2>cm/s to 7.12*10<-2>cm/s and are not easily plugged up by dust; the water-permeable bricks have relatively high compressive strength which reaches 38.25MPa to 45.60MPa.

The invention provides an integrated system suitable for ecological restoration and breeding in a tidal flat wind power farm and a monitoring combined system for environments in the wind power farm, and belongs to the field of marine renewable energy source utilization. In order to solve the problem of tidal flat ecological degradation in the tidal flat wind power farm, a cone-shaped net cage vertically includes an upper layer, a middle layer and a lower layer, a plant net cage for planting aquatic plants that can be used for tidal flat ecological restoration is arranged at the upper layer, asponge net cage provided with a sponge layer that can store water is arranged at the middle layer, the aquatic plants of the upper layer are planted and fixed in the sponge layer, the lower layer is isolated by the sponge layer located above the lower layer and a gravity filler located below the lower layer, the isolation space and the cone-shaped part form a culture net cage located at the lowerlayer, the lower layer and the gravity filler part are located in tidal flat mud, gaps formed among the gravity filler are filled by the tidal flat mud, the surface of the gravity filler is partiallycovered by the tidal flat mud, and the part of the tidal flat mud in the breeding net cage is the living space of bred organisms. The systems have the effect of reducing the impact of the wind power farm on the tidal flat environments.

The invention relates to a method for restoring a eutrophic tidal flat sediment habitat. The method comprises the following steps of: preparing bacteria solution; preparing stationary liquid; uniformly mixing and gelling the bacteria solution and the stationary liquid; preparing CaC12 solution; fixedly granulating the gelled bacteria solution; collecting and preserving; carrying out combined operation of plowing and environmental restoration bacteria immobilized particles; arranging shellfishes and clam worms; and regularly monitoring. The method disclosed by the invention is capable of effectively protecting bacterial strains and has the buffer function in an environment that physical and chemical factors are more severe; an effective vector can be provided for the bacterial strains, so that the bacterial strains have the bacteria restoration function effectively for a long time; by means of bioturbation of the shellfishes and the clam worms, the nitration and denitrification effects of sediments can also be effectively increased; and in addition, by means of combined use of the above methods, the method has good environment-friendly value and market application prospect to environmental restoration.

The invention provides a coastal mud flat salinity inversion method based on a remote sensing satellite image, and the method comprises the specific steps: S1, selecting a data source, and obtaining image data; meanwhile, sampling mud flat salt content data of a to-be-studied area are obtained; S2, preprocessing the image data in the step S1; S3, combining the image data preprocessed in the step S2 and the sampled tidal flat salt content data of the to-be-studied area obtained in the step S1 to extract sampling point waveband reflectivity and salinity index values; S4, analyzing the correlation between the influence factor and the tidal flat salt content data, and determining a variable factor for constructing a tidal flat salt content comprehensive inversion model; S5, according to the variable factors obtained in the step S4, constructing a mud flat salt content comprehensive inversion model based on a multiple regression model; and S6, verifying the comprehensive inversion model ofthe salt content of the tidal flat. The salt content of different positions of one mud flat is calculated and predicted, later development and utilization are facilitated, the labor cost is saved, andthe collection efficiency is improved.

The invention discloses an in-situ bioremediation method of a marine pollutant sedimentary environment. The method comprises steps that: a long dam is constructed at a remediation area which is a tidal flat with heavy-metal pollution or with a high eutrophication degree; mechanical plowing is carried out upon the tidal flat; suaeda heteroptera artificial sowing and colonization are carried out atthe remediation area in spring; fermented, dried and crushed livestock and poultry organic fertilizer is applied to the remediation area before lobworm seedlings are transplanted; and lobworm seedlings of above 10 setigers are transplanted into the remediation area. According to the invention, with lobworm and suaeda heteroptera, a lobworm-suaeda heteroptera in-situ combined bioremediation systemis constructed. Through the reformation upon the tidal flat, appropriate conditions are provided for the growth of lobworm and suaeda heteroptera. Lobworm has an advantage that in a sedimentary environment, pollutants such as heavy metals can be biologically utilized by lobworm. With the method provided by the invention, the advantage is reinforced, such that the bioavailability and the biological enrichment processes of the pollutants are promoted in suaeda heteroptera. Therefore, mutual ecological and metabolic pathway complementation of lobworm and suaeda heteroptera in the sedimentary environment is realized, such that the efficiency of the in-situ combined bioremediation process is improved.

The invention relates to a photovoltaic support foundation structure applicable to tidal flat photovoltaic power station and a construction method. The structure comprises foundations arranged on the ground, and the photovoltaic support is arranged on the foundations and comprises front columns and rear columns. The front columns and the rear columns are arranged on the different foundations. The structure is characterized in that connectors are pre-buried at the tops of the foundations, and the photovoltaic support is connected with the foundations through the connectors. The sections of the foundations are rectangles with 0.2m-0.4m side lengths or circles with 0.2m-0.4m diameters. The foundation length is in a range of 2m to 5m. According to the structure and the construction method, stress is reasonable and reliable, force transmission ways are clear, the concrete usage amount is small, the earth excavation volume is not needed, construction precipitation is not needed, the cost is low, the consumption labor is little, the construction speed is fast, the durability is high, the structure is particularly applicable to tidal flat positions which are weak in foundation bearing capacity, difficult in earth excavation, shallow in underground water level and high in corrosion.

It relates to an method of intermediate rearing mussel germchits during later period in shallows. When the germchits are cultivated during later period at natural cultivating sea zones, the germchitsare cultivated in string bags, and hanged at buoyant rafts and cultivated. The method comprises: transferring juvenile mollusks with the 0.4??.5mm shells in length into string bags, 5,000í½11,000 juvenile mollusks in a string bag, assembling 6í½10 bags into a bundle, assembling 10-15 bundles into a string, the distance between strings is 15í½30cm; the distance between the string ropes is 1.0í½1.5mú

The invention discloses a tidal flat low-dam high-net ecological aquaculture typhoon-resistant facility. The inner and outer sides of a rod are arranged in a staggered mode; the upper ends of more than one rope are fixed at the upper end of the rod, and the lower ends of the ropes are fixed on a pile; a net is fixed in the middle of the rod; the upper end of the net is fixed on the rod; a stalk is fixed on a mesh at the lower end of the net; the rod, the net with a door and the ropes are connected to form a closed purse net; the lower end of the rod and the stalk are buried in a seawall; the pile is buried in the tidal flat to form a fence; a closed outer purse net which is formed by connecting by an outer rod, an outer net with an outer door and an outer rope is fixed outside the fence in a certain distance; and the lower end of the outer rod, the stalk and the outer pile are directly buried in the tidal flat to form an outer fence. The net is fixed in the middle of the rod, and the pressure of the typhoon on the fence is changed, reduced and lightened, so that the net is uniformly stressed in a disperse mode, slightly deforms and is not torn and blown away by the typhoon due to a bulge in the middle of the net; and by utilizing a double-layer fence, the impact of floating objects can be blocked by the outer fence, the typhoon resistance is improved through the inner and outer fences, the breeding industry is powerfully developed, the shortage of natural resources of marine products is offset, and vitality of the sustainable development of marine economy is increased.

The invention discloses a method for measuring soil CO2 flux in a tidal flat wetland during early and later intertidal periods. The method comprises the following steps: selecting standard sample points in medium and high tide regions of a region to be measured, measuring six groups of CO2 concentration values required for building a model, and drawing a CO2 concentration-time chart; fitting by using an equilateral hyperbolic equation to obtain a regression equation, and calculating a first-order derivative of the equation to obtain the real-time CO2 flux at time periods; performing regression analysis on a relationship between the real-time flux and the real-time concentration by adopting a three-parameter Gauss equation to obtain a model of the soil CO2 flux of the region; quickly obtaining CO2 concentration data in the region to be measured by adopting a portable soil CO2 analyzer; and substituting the obtained real-time CO2 concentration into the obtained equation model to obtain the corresponding soil CO2 flux. The method is easy and liable to implement, can be used for accurately measuring the soil CO2 flux in the tidal flat wetland during the early and later intertidal periods, and can be applied to estimation of carbon sources/sink values of a coastal wetland ecosystem and evaluation of soil efficiency.

The invention discloses a flat-ground type biomass landfill. The flat-ground type biomass landfill comprises plain, tidal flat and gobi desert which have gentle terrains and a landfill built in desert, wherein the flat-ground type biomass landfill consists of a bottom lining system, a landfill unit, a coverage system, a leachate collecting treatment system, a landfill gas collecting treatment system, a landfill heat energy collecting treatment system and an underground water monitoring system. By using the biomass landfill, the biomass formed by absorbing CO2 under a plant photosynthesis action can be accommodated and buried, so that the content of the CO2 in earth atmosphere is reduced, and the gas, the liquid and the heat energy generated in an organic matter decomposition process also can be utilized, the flat-ground type biomass landfill can be applied to multiple fields, the pollution to the environment caused by biomass landfill and the waste of resources are reduced, and the landfill is sanitary, clean, economical and efficient and wide in application prospect.

The invention discloses a moveable waterborne sand sucking platform, which comprises a platform body, a sand sucking device mounted on the platform body, an operation cabin arranged on the platform body, pontoons fixedly arranged on both longitudinal sides of the lower portion of the platform, a platform propelling device mounted on the tail of the platform body and controlled by a platform control device, the platform body is provided with a vertical channel communicating with the upper surface and the bottom of the platform body and capable of allowing the sand sucking pump to pass through, and the platform body is also provided with a sand sucking pump lifting device which lifts through the central vertical channel of the platform and is disposed between the two pontoons to make the center of gravity of the platform be relatively stable, so that the platform can work normally when encountering stormy waves and improve the work efficiency; the use of pontoons permits the invention to work in water areas with low water level such as tidal flat and shoal, and the invention can be widely used for big engineering work such as shipping channel dredging and river channel cleanout.