CN113642078B - Beach diversion regulation and control method for water environment treatment - Google Patents
Beach diversion regulation and control method for water environment treatment Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 13
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- 239000004576 sand Substances 0.000 claims description 3
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Abstract
The invention discloses a beach diversion regulation method for water environment treatment, which is to realize the method of the proposal, firstly, an inlet hydraulic dam crossing a river course is required to be built at the upstream inlet position of a beach, the diversion of the beach is regulated and controlled by the inlet hydraulic dam, and the specific diversion realization method comprises the steps of obtaining the water depth of a main river channel at the upstream inlet of the beach, the width of the inlet, the design water cross section area, the vintage rate of the beach, the hydraulic radius and the hydraulic slope drop; calculating the flow of the beach inlet by adopting a wide top weir flow formula according to the width of the beach inlet; calculating the designed flow of the beach overflow according to the vinasse rate, the hydraulic radius and the hydraulic slope of the beach, and adjusting the beach diversion according to the comparison relation between the inlet flow of the beach and the designed flow of the beach overflow.
Description
Technical Field
The invention relates to river water environment treatment technology, in particular to a beach diversion regulation method for water environment treatment.
Background
At present, river water environment treatment work is mainly concentrated outside the river channel, mainly adopts source treatment and process blocking measures, reduces the generation of pollutants on one hand, collects sewage to enter a sewage treatment plant on the other hand, and discharges the sewage to the river channel after treatment. After entering the river channel, the water flow speed is high due to the narrow space, and effective measures are difficult to further take for purifying the water body. In order to build river channel landscapes, barrages are built on certain urban river sections, large water surfaces are formed on river sections on the upstream sides of barrages, beach spaces on the downstream sides of barrages are not well utilized, water flows are dispersed, beach lands are messy, and water bodies in barrages are easy to pollute.
Some river courses have higher beach areas, and when floods occur in five years or ten years, water flows can go up the beach, and the beach areas are idle most of the time. In order to form a good river course landscape by using the beach, a water pipeline is buried in the dam position in a landscape design project, and the water flow upstream of the dam is introduced into the beach to form a beach stream landscape. The water quantity of the buried pipe diversion is smaller than the river flow, and is difficult to be suitable for the river with larger flow.
Disclosure of Invention
Aiming at the defects in the prior art, the beach diversion regulation method for water environment treatment solves the problem that the water body in the main river channel of the existing river is difficult to enter the beach.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the utility model provides a beach groove reposition of redundant personnel regulation and control method for water environment is administered, it builds the import hydraulic pressure dam that spans across river course main tank in the import position on beach area, adjusts and controls the reposition of redundant personnel on beach area through import hydraulic pressure dam, and this method includes:
acquiring the water depth of a main river channel at the upstream of an inlet of the beach, the width of the inlet, the designed water cross-section area, the vinasse rate of the beach, the hydraulic radius and the hydraulic slope;
calculating the flow Q of the beach inlet by adopting a wide top weir flow formula according to the width of the beach inlet 1 ：
Wherein B is 1 The width of the entrance of the beach is the unit m; g is gravity acceleration, unit m/s 2 ；σ s To drown the coefficient, sigma c For the coefficient of contraction, H 0 The water depth of the main river channel at the upstream of the beach inlet is set as a unit m, and m is a flow coefficient;
calculating the flow of the beach overflow design according to the vinasse rate, the hydraulic radius and the hydraulic slope of the beach:
wherein Q is T Designing flow for beach overcurrent; a is that T For designing the cross-sectional area of water at the entrance of beach, n T For the beach vinasse rate, R T Is the hydraulic radius of the beach; j (J) T Is the hydraulic power slope of the beach;
according to the comparison relation between the beach inlet flow and the beach overcurrent design flow, beach diversion is adjusted:
when Q is 1 ≤Q T Closing an inlet hydraulic dam of the section of the beach inlet, and overflowing the beach; when Q is 1 ＝Q T When the hydraulic dam is closed, the upstream water enters the beach, and flows through the beach, and the water at the position of the main river channel passes through the hydraulic dam and enters the main river channel of the river channel at the downstream of the hydraulic dam; when Q is 1 ＞Q T When in use, the opening degree of the inlet hydraulic dam is adjusted, the drainage flow of the main river channel is increased, and the beach inlet flow Q is controlled 1 ≤Q T 。
The beneficial effects of the invention are as follows: according to the scheme, the inlet hydraulic dam is arranged at the inlet of the beach, the gate is adjusted according to the relation between the beach inlet flow and the beach overflow design flow, so that conditions are provided for water flow to the beach, the utilization of the high beach is possible, and the river space is fully utilized;
the characteristics of the inlet hydraulic dam are fully utilized, the flow of the main river channel and the beach is regulated, and meanwhile, when flood is carried out in the flood season, the occupied flood carrying space of the inlet hydraulic dam is smaller than that of other dam types; according to the length and width of the beach, the flow entering the beach can be adjusted, a large water surface can be formed on the beach, a sand settling area and an ecological purification area are formed by combining the design of the wetland on the beach, the effect of improving the water quality is achieved, and meanwhile different landscape effects of the main flow and the beach can be formed.
Drawings
FIG. 1 is a flow chart of a beach diversion control method for water environmental remediation.
Fig. 2 is a schematic diagram of a beach diversion control structure.
1, an inlet hydraulic dam; 2. an outlet hydraulic dam; 3. beach area; 4. a main river channel; 5. high beach.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate 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 all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Before realizing diversion regulation, the scheme needs to build an inlet hydraulic dam 1 crossing a river channel at an inlet position of the beach, and referring to fig. 1, fig. 1 shows a beach diversion regulation method for water environment treatment, and diversion of the beach is regulated by the inlet hydraulic dam 1, wherein the method S comprises steps S1 to S4.
In the step S1, the water depth of a main river channel at the upstream of an entrance of the beach, the width of the entrance, the designed water cross-section area, the vinasse rate, the hydraulic radius and the hydraulic slope of the beach 3 are obtained;
in step S2, calculating the beach inlet flow Q by using a wide top weir flow formula according to the width of the beach inlet 1 ：
Wherein B is 1 The width of the entrance of the beach is the unit m; g is gravity acceleration, unit m/s 2 ；σ s To drown the coefficient, sigma c For the coefficient of contraction, H 0 The water depth of the main river channel at the upstream of the beach inlet is set as a unit m, and m is a flow coefficient;
in implementation, the flow coefficient calculation formula is preferably:
m＝0.36，P/H≥3.0
wherein P is the depth of water in the upstream incoming flow direction of the beach, and the unit is m; h is the water depth of the section of the beach inlet, and the unit is m.
In step S3, calculating the beach overflow design flow according to the beach vintage, hydraulic radius and hydraulic slope drop:
wherein Q is T Designing flow for beach overcurrent; a is that T The cross-sectional area of water passing through is designed for the entrance of beach, n T For the beach vinasse rate, R T Is the hydraulic radius of the beach; j (J) T Is the hydraulic power slope of the beach;
in step S4, according to the comparison relationship between the beach inlet flow and the beach overcurrent design flow, the beach diversion is adjusted:
when Q is 1 ≤Q T Closing an inlet hydraulic dam of the section of the beach inlet, and overflowing the beach; when Q is 1 ＝Q T When the hydraulic dam is closed, the upstream water enters the beach, and flows through the beach, and the water at the position of the main river channel passes through the hydraulic dam and enters the main river channel of the river channel at the downstream of the hydraulic dam; when Q is 1 ＞Q T When in use, the opening degree of the inlet hydraulic dam is adjusted, the drainage flow of the main river channel is increased, and the beach inlet flow Q is controlled 1 ≤Q T 。
In implementation, the design height of the inlet hydraulic dam 1 is preferably as follows:
H z ＝(Z T -Z C )+H T +a
wherein H is Z Designing the height of an inlet hydraulic dam in m; z is Z T Is the beach inlet elevation, unit m, Z C The unit m and a are ultrahigh parameters for the elevation of the main river channel of the section of the inlet hydraulic dam, and 0.1m can be taken under the condition of small influence of wind waves; h T The water depth is designed for beach, unit m. The method comprises the steps of carrying out a first treatment on the surface of the
When the scheme is implemented, the optimal diversion regulation method further comprises the step of constructing an outlet hydraulic dam 2 crossing a river channel at the outlet position of the current beach, wherein the elevation of the outlet hydraulic dam 2 is as follows:
wherein Z is xT The unit m is the beach elevation of the downstream beach outlet dam site position;maximum water depth is designed for beach outlet section, unit m, Z xC The height of the main river channel bed is the unit m for the downstream barrage position.
The downstream outlet of the beach 3 is provided with a barrage, so that the flow velocity of the beach 3 water flow can be effectively slowed down, and in order to realize the purification effect of the beach 3, the diversion ratio of the beach 3 and the main river channel 4 can be controlled by using the outlet hydraulic barrage 2 according to the size of the incoming flow, and the purification of the beach 3 and the river channel are not affected. Meanwhile, due to the water choking effect of the downstream barrage, a certain water surface is formed in the main river channel 4, and the functions of settling and purifying the water body are achieved. As the incoming flow increases, the water level on the outlet hydraulic dam 2 increases and the main flow and beach 3 may flow through simultaneously to reduce the impact on the flood.
When water flow exists in the beach 3, the opening degree of the outlet hydraulic dam 2 is adjusted to enable the flow speed of the water flow in the beach 3 to be smaller than 0.5m/s and the water depth to be smaller than 0.5m, so that the water flow can be ensured to slowly pass through the beach 3, and sufficient purification can be realized; the flow rate and the water depth are suitable for vegetation germination and growth period when the flow rate and the water depth are 4 months and 5 months.
Sand settling equipment, filtering equipment, purifying equipment and/or slow flow equipment are arranged in the beach 3, or wetland landscapes are planted in the beach 3; after the arrangement, the water body retention time can be further prolonged, and the wetland landscape on the beach can be created while the water environment is purified.
The beach shunting regulation structure corresponding to the beach shunting regulation method for water environment treatment according to the scheme is shown in fig. 2, and mainly comprises an inlet hydraulic dam 1 and an outlet hydraulic dam 2, wherein the middle river reach has available large-area high beach 5.
Upstream incoming flow is choked before the inlet hydraulic dam 1, because the elevation of the beach 3 is lower than the dam crest of the inlet hydraulic dam 1 (the elevation difference can be determined according to the water flow design flow of the beach 3 and the river channel incoming flow design), when the water level is higher than the elevation of the beach 3, the water flow is concentrated to one side of the beach 3, enters the high beach 5 through a gate lower than the beach 3, forms water on the high beach 5, and creates conditions for further wetland purification.
The submerged dams or fish scale-shaped submerged dams can be built on the high beach 5, so that the water flow residence time is increased, the water passing width of the beach 3 is promoted to be increased, and meanwhile, the ecological purification facility design can be carried out on the beach 3. In addition, the inlet hydraulic dam 1 and the outlet hydraulic dam 2 can form a certain water storage and sediment purification effect in the river channel. When the water flow is large and exceeds the hydraulic dam elevation, the main river and the beach 3 can flow simultaneously.
Because the beach 3 overflow ability is limited, this scheme mainly aims at the purification of the water under the design flow, and when the inflow is great, main river course and beach 3 overflow simultaneously, and water purification effect reduces, and the river course is in the flood discharge state.
Claims (3)
1. The beach diversion regulation and control method for water environment treatment is characterized in that an inlet hydraulic dam crossing a river channel is built at an inlet position on the beach upstream, and the beach diversion is regulated and controlled through the inlet hydraulic dam, and the method comprises the following steps:
acquiring the water depth of a main river channel at the upstream of an inlet of the beach, the width of the inlet, the designed water cross-section area, the vinasse rate of the beach, the hydraulic radius and the hydraulic slope;
calculating the flow of the beach inlet by adopting a wide top weir flow formula according to the width of the beach inlet：
Wherein,B 1 the width of the entrance of the beach is the unit m;gis the gravitational acceleration, unit m/s 2 ；For the submerging coefficient +.>For the contraction coefficient->The water depth of the main river channel at the upstream of the beach inlet is equal to the unit m,mis the flow coefficient;
calculating the flow of the beach overflow design according to the vinasse rate, the hydraulic radius and the hydraulic slope of the beach:
wherein,designing flow for beach overcurrent; />The cross-sectional area of water is designed for the entrance of beach>For the beach sediment rate, < >>Is the hydraulic radius of the beach; />Is the hydraulic power slope of the beach;
according to the comparison relation between the beach inlet flow and the beach overcurrent design flow, beach diversion is adjusted:
when (when)Closing an inlet hydraulic dam of the section of the beach inlet, and overflowing the beach; when->When the hydraulic dam is closed, the upstream water enters the beach, and flows through the beach, and the water at the position of the main river channel passes through the hydraulic dam and enters the main river channel of the river channel at the downstream of the hydraulic dam; when->When in use, the opening degree of the inlet hydraulic dam is adjusted, the drainage quantity of the main river channel is increased, and the inlet flow quantity of the beach is controlled>；
The design height of the inlet hydraulic dam is as follows:
wherein the method comprises the steps of，Designing the height of an inlet hydraulic dam in m; />Is beach entrance elevation, unit m, & lt/L>Is the elevation of the main river channel of the section of the inlet hydraulic dam, the unit of m #>The ultra-high parameter can be 0.1m under the condition of less influence of wind and waves; />The water depth is designed for the beach, and the unit is m;
the beach diversion regulation and control method for water environment treatment further comprises the step of constructing an outlet hydraulic dam crossing a river channel at the outlet position of the current beach, wherein the elevation of the outlet hydraulic dam is as follows:
wherein,the unit m is the beach elevation of the downstream beach outlet dam site position; />The maximum water depth is designed for the beach outlet section, the unit of m and the unit of +.>The elevation of the main river channel bed at the downstream barrage position is given by the unit m;
when water flow exists in the beach, the opening degree of the outlet hydraulic dam is adjusted, so that the flow speed of the water flow in the beach is less than 0.5m/s, and the water depth is less than 0.5m.
2. The beach diversion control method for water environment treatment according to claim 1, wherein the flow coefficient has a calculation formula:
wherein,Pthe water depth is the unit m in the upstream incoming flow direction of the beach;Hthe water depth of the section of the beach inlet is in m.
3. The beach diversion control method for water environment treatment according to claim 1 or 2, characterized in that sand settling equipment, filtering equipment, purifying equipment and/or slow flow equipment are arranged in the beach, or a wetland landscape is planted in the beach.
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| CN202110947519.0A CN113642078B (en) | 2021-08-18 | 2021-08-18 | Beach diversion regulation and control method for water environment treatment |
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| CN112982273A (en) * | 2021-02-18 | 2021-06-18 | 中国水利水电科学研究院 | Ecological space optimization and function improvement method for river wetland |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112982273A (en) * | 2021-02-18 | 2021-06-18 | 中国水利水电科学研究院 | Ecological space optimization and function improvement method for river wetland |
Non-Patent Citations (3)
| Title |
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| 水深及滩地糙率对复式断面河道过流能力的影响;姬昌辉;张幸农;谢瑞;;人民黄河(第01期);48-51 * |
| 黄河下游切滩导流效果分析;李红旗;梁建林;;人民黄河(第06期);18-19+39+146 * |
| 黄河下游复式河道滩槽分流特征研究;胡春宏;张治昊;;水利学报(第01期);5-13 * |
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