CN103938579B - Wrong presser feet bundle shape ecological riverway between tidal reach - Google Patents
Wrong presser feet bundle shape ecological riverway between tidal reach Download PDFInfo
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- CN103938579B CN103938579B CN201410095413.2A CN201410095413A CN103938579B CN 103938579 B CN103938579 B CN 103938579B CN 201410095413 A CN201410095413 A CN 201410095413A CN 103938579 B CN103938579 B CN 103938579B
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Abstract
The present invention relates to wrong presser feet bundle shape ecological riverway between a kind of tidal reach, comprise the river course body surrounded by both sides embankment, described river course body is provided with some jackstone presser feets heap, and described each jackstone presser feet piles wrong along between embankment direction layout, makes the riverbed forming " S " type in river course body.The wrong jackstone presser feet heap arranged between the present invention is interior by river course body, can reach at low discharge, particularly under tidal reach, reversing current operating mode, riverbed is restrainted narrow in "S" shape, strengthen riverbed flow velocity and the depth of water, enrich flow-shape, provide more various embankment foot-propelled plant habitat, river training ecoscape effect.The present invention can be applicable to the river improvement under low flow rate condition.
Description
Technical field
The present invention relates to dredging waterway, particularly relate to wrong presser feet bundle shape ecological riverway between the tidal reach under a kind of low flow rate condition.
Background technology
Presser feet is the important measures preventing levee toe scour in dredging waterway design, ensure embankment safety, and current known presser feet is jackstone presser feet, and being also called jackstone presser feet band, is zonal distribution along embankment pin.Jackstone presser feet band is divided into flat riverbed and two kinds, high riverbed citation form, respectively has its suitability and limitations.
(1) flat riverbed jackstone presser feet band: its jackstone face is consistent with bed elevation, and jackstone is that continuous flat belt-like is arranged at embankment pin, and size is determined, usual thickness 0.5 ~ 1.0m, width 1.5 ~ 2.5m according to embankment condition, supports embankment barricade pin after jackstone band.Because jackstone face is contour with design riverbed, this presser feet mode when play prevent flood to dike bank base eroding, prevent levee toe from soaring aloft, the function such as ballast levee toe antiskid, without hindrance to current, but because levee toe flow rate of water flow is slow, often on levee toe jackstone band, form mud seashore, cover jackstone band, under low flow rate condition, current are that shallow disc shape flows in the middle part of riverbed, single landscape, the depth of water is shallow, flow velocity is slow, and fluidised form is single, under the submergence of jackstone band and the water surface, less with extraneous water exchange capacity, therefore its ecoscape weak effect.
(2) high riverbed jackstone presser feet band: in the section that part geological conditions is poor, particularly when utilizing old bank structure strengthening reconstruction, due to scruple excavation levee toe jackstone engineering method again, embankment safety may be damaged, often directly form continuous band-shaped presser feet along levee toe jackstone or dry stone wall.Although the method adds embankment pin counterweight, under there is low discharge, current are restrainted narrow one-tenth and are bordering on linearity and flow in the middle part of riverbed, single landscape during low water, in addition current flow process is short, and fluidised form is single, in addition, between jackstone, gap is excessive, to water body without filtration, purification function, therefore its ecoscape weak effect.
Summary of the invention
In order to overcome above-mentioned technical problem, the object of the present invention is to provide wrong presser feet bundle shape ecological riverway between a kind of tidal reach of river training ecoscape effect.
The technical solution adopted in the present invention is:
Wrong presser feet bundle shape ecological riverway between a kind of tidal reach, comprise the river course body surrounded by both sides embankment, described river course body is provided with some jackstone presser feets heap, and described each jackstone presser feet piles wrong along between embankment direction layout, makes the riverbed forming " S " type in river course body.The structure in this river course is except when ensureing the anti-current scour of embankment presser feet, counterweight antiskid basic function, the thinking of the continuous band-shaped layout of abandoning tradition jackstone presser feet, wrong formula jackstone presser feet heap between adopting between embankment, under making low flow rate condition, in the serpentine meandering flow of releiving between jackstone presser feet heap wrong between current edge, flow process is lengthened, and flow velocity is accelerated, thus riverbed, degradation middle part, form serpentine riverbed.Current constantly change direction in serpentine riverbed, and fluidised form is abundanter.Levee toe between jackstone presser feet heap is then because water velocity is low, formed between presser feet heap and levee toe and be bordering on leg-of-mutton alluvial district, the rock windrow that most of the time is dipped in alluvial district under water and riverbed under water and is interrupted exposure forms the ecological river course enriched jointly, than continuous print jackstone presser feet band, abundanter animals and plants habitat can be formed.
As the further improvement of technique scheme, described each jackstone presser feet heap is high 0.5 ~ 2 times of embankment along embankment direction arrangement length.
As the further improvement of technique scheme, the jackstone presser feet heap spacing that described homonymy embankment is adjacent is that 1.5 ~ 3 times of embankments are high.
As the further improvement of technique scheme, the width that described each jackstone presser feet piles vertical embankment is 1/4 ~ 1/3 of river course body width.
As the further improvement of technique scheme, described jackstone presser feet heap is higher than the low tide in river course.
As the further improvement of technique scheme, described jackstone presser feet heap crest level is lower than 10 ~ 20cm of river course mean high water water level.
As the further improvement of technique scheme, the jackstone gap filling sandy soil of described jackstone presser feet heap.Due at tidal reach, the river water level every day of reciprocation cycle lifting between high water mark and low tide, while the narrow serpentine river course of halved tie constantly carries out washing away, between wrong formula jackstone presser feet heap can continuous submergence and exposure in the water surface, after filling sandy soil in presser feet heap, hole in sandy soil can absorb water when continuous flood tide submergence, and during ebb tide exposure, slow water seepage, plays filtering function; The filling of sandy soil simultaneously also can increase the weight of jackstone presser feet heap, is beneficial to and strengthens stability of embankment further.
As the further improvement of technique scheme, the transmission coefficient of described sandy soil is between 1 ~ 5m/d.
The invention has the beneficial effects as follows: the wrong jackstone presser feet heap arranged between the present invention is interior by river course body, can reach at low discharge, particularly under tidal reach, reversing current operating mode, the serpentine that narrow one-tenth releives is restrainted in riverbed, strengthen riverbed flow velocity and the depth of water, enrich flow-shape, provide more various embankment foot-propelled plant habitat, river training ecoscape effect.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is further described.
Fig. 1 is layout plan of the present invention;
Fig. 2 is that A in Fig. 1 is to sectional drawing;
Fig. 3 is that B in Fig. 1 is to sectional drawing.
In figure, 1 is embankment, and 2 is jackstone presser feet heap, and 3 is sandy soil, and 4 is mean high water water level, and 5 is mean low-water, and 6 is design flood level.
Detailed description of the invention
Wrong presser feet bundle shape ecological riverway between tidal reach as shown in Figure 1-Figure 3, comprise the river course body surrounded by both sides embankment 1, river course body is provided with some jackstone presser feets heap 2, and each jackstone presser feet heap 2 is arranged along wrong between embankment 1 direction, makes the riverbed forming " S " type in river course body.Be different from traditional continuous band-shaped jackstone presser feet, the jackstone presser feet heap 2 of the present embodiment be between wrong formula arrange, jackstone presser feet heap 2 disconnects along embankment 1 direction, be about high 0.5 ~ 2 times of embankment 1 along embankment 1 direction arrangement length, the jackstone presser feet that the same side embankment 1 is adjacent piles 2 spacing, and to be about 1.5 ~ 3 times of embankments 1 high; Jackstone presser feet heap 2 is highly set to a little less than mean high water water level 10 ~ 20cm.For Guangzhou Section of Pearl River, mean high tide is pearl base 0.7 ~ 0.8m, and corresponding rock windrow crest level gets 0.6m.Jackstone presser feet heap 2 vertical embankment 1 width account for river course wide 1/4 ~ 1/3.According to principles of soil mechanics, to increase the jackstone presser feet heap 2 that high, wide mode is formed, compared with thinner jackstone band, by Earth Pressure, jackstone presser feet heap 2 can form larger soil pressure, increase the skid resistance of embankment pin to river course slippage, between jackstone presser feet heap 2, then form three-dimensional effect, also can play the function of limit slippage to embankment 1 between presser feet heap.
Preferably, be filled with sandy soil 3 between each jackstone presser feet heap 2, jackstone end face and side need leveling.Because embankment pin is in the privileged sites of land and water handing-over, its permeation filtration is the important component part of ecological riverway, heavy state of committing suicide safely in tradition embankment Hydraulic Design, not good to the utilization of presser feet Ecological Potential, between jackstone, space is excessive, water body turnover excessive velocities, cannot effective filtration, purification water quality.The present embodiment, using improving, recovering the ecological functions of embankment jackstone presser feet as important goal, piles at jackstone presser feet the sandy soil 3 that 2 fillings have penetrating power.
Sandy soil 3 refers to containing sand grains more, has the soil of certain viscosity.In order to produce effective filtration, purification effect, the coefficient of permeability K reaching casting resin in the rock windrow of 30% in porosity namely can not too greatly can not be too little, and transmission coefficient is excessive, current F.F. goes out soon, transmission coefficient is too small, and water body is difficult to infiltration and oozes out, all cannot effective filtration, purification water quality.Adjusted by the grating of sandy soil, its transmission coefficient can be adjusted to 1 ~ 5m/d, last with the tidal reach ebb of rising of 5 ~ 7 hours and match, during ebb of at every turn rising, complete the exchange between filler pore water and river water body.In the river course of the present embodiment water body flow and exchange process as follows:
(1) to trace to the source current and submergence water-filling: jackstone presser feet piles 2 higher than low tide (for Guangzhou Section of Pearl River, mean low-water is pearl base-0.4 ~-0.8m, and corresponding rock windrow pin elevation gets-0.5m), therefore, during low tide, it is that exposure is in the water surface that jackstone presser feet piles 2 considerable parts.On the one hand along with flood tide, tidewater piles 2 meanders along jackstone presser feet, trace to the source and on; On the other hand, the exposure part of jackstone presser feet heap 2 goes up along with water level, is submerged gradually.
(2) groove current are made and exposure is seeped water: after flood tide to high water mark, river water level enters ebb process immediately, the jackstone presser feet heap 2 exposure water surface gradually, formed rip tide on the one hand and lead control, rip tide is limited in the river course between jackstone presser feet heap 2, according to hydraulic principle, compare to straight line flow process, when the same volume water body in ebb period process middle and upper reaches section flows through, distance lengthens, and flow velocity will be accelerated, concentrated flow amount is made in formation, decrease channel fill, even degradation riverbed, is beneficial to river maintenance.Levee toe between jackstone presser feet heap 2 is then because water velocity is low, is formed and be bordering on leg-of-mutton alluvial district between presser feet heap and levee toe, the jackstone presser feet that the most of the time is dipped in alluvial district under water and riverbed under water and is interrupted exposure pile the 2 common river courses forming ecology and enrich.On the other hand, along with jackstone presser feet piles the increase of 2 exposure elevations, the pore water in jackstone gap in sandy soil 3 oozes out gradually.Be filled with water to exposure infiltration from submergence, complete a filtration cycle.The void ratio of sandy soil can reach e=0.8, porosity in conjunction with jackstone presser feet heap 30% calculates, interstitial space then in every cubic metre of jackstone presser feet heap 2 is 0.13 cubic metre, the change about 3 ~ 5% of each circulation water content, namely converting the water yield of being oozed out to exposure buoyance by submergence saturation state for every cubic metre of jackstone presser feet heap 2 and sandy soil 3 is 10 ~ 20 liters, average 15 liters.
Guangzhou is irregular semi-diurnal tides, there is climax and each twice of low tide every day, therefore, in every cubic metre of jackstone presser feet heap 2 and sandy soil 3, the filtration yield that oozes out of water body is 30 liters, although the seepage discharge of every day is little, but ooze out with tide slowly infiltering of matching of retreating, the filtration yield in every kilometer of river course is 80 cubic metres/day, accumulatively reach 2.9 ten thousand steres/year.In conjunction with animals and plants collocation management such as pasture and water, spiral shell classes, each seepage flow circulation, can reach 10% ~ 15%, SS clearance to COD, TN, TP abatement and can reach 20% ~ 30%, therefore, the jackstone presser feet accumulative effect or appreciable improved of piling 2 pairs of river water qualities.
(3) flood passage: River Design flood level piles 2 crest levels apparently higher than jackstone presser feet, in addition ordinary water amount is to the degradation in riverbed, counteract the part reduced because raising jackstone face, therefore, the present embodiment can not cause significant negative effect to the overall flood passage flow section in river course.
The above is the preferred embodiment of the present invention, and it does not form limiting the scope of the invention.
Claims (7)
1. wrong presser feet bundle shape ecological riverway between a tidal reach, comprise the river course body surrounded by both sides embankment, it is characterized in that: described river course body is provided with some jackstone presser feets heap, described each jackstone presser feet piles wrong along between embankment direction layout, make the riverbed forming " S " type in river course body, described jackstone presser feet heap is higher than the low tide in river course.
2. wrong presser feet bundle shape ecological riverway between tidal reach according to claim 1, is characterized in that: described each jackstone presser feet heap is high 0.5 ~ 2 times of embankment along embankment direction arrangement length.
3. wrong presser feet bundle shape ecological riverway between tidal reach according to claim 1, is characterized in that: the jackstone presser feet heap spacing that described homonymy embankment is adjacent is that 1.5 ~ 3 times of embankments are high.
4. wrong presser feet bundle shape ecological riverway between tidal reach according to claim 1, is characterized in that: the width that described each jackstone presser feet piles vertical embankment is 1/4 ~ 1/3 of river course body width.
5. wrong presser feet bundle shape ecological riverway between tidal reach according to claim 1, is characterized in that: described jackstone presser feet heap crest level is lower than 10 ~ 20cm of river course mean high water water level.
6. wrong presser feet bundle shape ecological riverway between tidal reach according to any one of claim 1 to 5, is characterized in that: the jackstone gap filling sandy soil of described jackstone presser feet heap.
7. wrong presser feet bundle shape ecological riverway between tidal reach according to claim 6, is characterized in that: the transmission coefficient of described sandy soil is between 1 ~ 5m/d.
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| RU2338832C1 (en) * | 2007-03-12 | 2008-11-20 | Александр Васильевич Согин | Method of purification and restoration of biological ponds of purification plants |
| CN102094404A (en) * | 2011-02-21 | 2011-06-15 | 河海大学 | Method for constructing deep pool and shoal in straight river channel |
| CN103306241A (en) * | 2013-06-21 | 2013-09-18 | 清华大学 | Watercourse and rubber dam water storage system |
| CN203834420U (en) * | 2014-03-13 | 2014-09-17 | 广州市市政工程设计研究院 | Tidal reach staggered pressing foot bundle-shaped ecological river channel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2338832C1 (en) * | 2007-03-12 | 2008-11-20 | Александр Васильевич Согин | Method of purification and restoration of biological ponds of purification plants |
| CN102094404A (en) * | 2011-02-21 | 2011-06-15 | 河海大学 | Method for constructing deep pool and shoal in straight river channel |
| CN103306241A (en) * | 2013-06-21 | 2013-09-18 | 清华大学 | Watercourse and rubber dam water storage system |
| CN203834420U (en) * | 2014-03-13 | 2014-09-17 | 广州市市政工程设计研究院 | Tidal reach staggered pressing foot bundle-shaped ecological river channel |
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Address after: 510060 Guangdong, Guangzhou City, East Central Road, Municipal Services Building, East staircase, No. 348 Applicant after: Guangzhou City Engineering Design studies total institute Address before: 510060 Guangdong, Guangzhou City, East Central Road, Municipal Services Building, East staircase, No. 348 Applicant before: Guangzhou Municipal Engineering Design and Research Institute |
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Address after: 510060 East seat, No. 348 East Ring Road, Guangzhou, Guangdong, Yuexiu District Patentee after: Guangzhou municipal engineering design and Research Institute Co., Ltd. Address before: 510060 East staircase, Municipal Services Building, 348 East Ring Road, Guangzhou, Guangdong Patentee before: Guangzhou City Engineering Design studies total institute |