CN114528624A

CN114528624A - Water flow acceleration method and system for water delivery open channel

Info

Publication number: CN114528624A
Application number: CN202210141560.3A
Authority: CN
Inventors: 张金良; 景来红; 刘继祥; 崔振华; 陈松伟; 罗秋实; 赵翔
Original assignee: Yellow River Engineering Consulting Co Ltd
Current assignee: Yellow River Engineering Consulting Co Ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-24

Abstract

The invention provides a method and a system for accelerating water flow of a water delivery open channel, wherein the method comprises the following steps: the method comprises the steps of obtaining the change rate of design parameters of the water delivery open channel, determining the current water delivery capacity of the water delivery open channel based on the change rate of the design parameters, judging whether the current water delivery capacity is qualified, if so, not needing subsequent operation, otherwise, determining the overflow and the water head to be increased according to the current water delivery capacity, and calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis. The current water delivery capacity of the water delivery open channel is evaluated, the overflowing quantity and the water head to be increased of the water delivery open channel are determined, the water delivery capacity of the water delivery open channel is visually improved by setting the axial flow pump to increase the flow velocity of water, and the overall engineering work efficiency and the experience of workers are improved.

Description

Water flow acceleration method and system for water delivery open channel

Technical Field

The invention relates to the field of open channel water delivery engineering, in particular to a water flow acceleration method and system for a water delivery open channel.

Background

Water resource space distribution in China is extremely unbalanced, water in south is more, water in north is less, and water shortage in resource is an important factor for restricting economic and social development of China, especially in north. The long-distance water delivery project is an important water resource optimization configuration project measure for solving the problems of uneven water resource space distribution and resource water shortage in China, and is an important guarantee for water safety in China.

In order to solve the problem of insufficient water delivery capacity of the channel, the invention develops a new method, utilizes the open channel to design safe redundancy, adopts a mode of increasing the flow velocity of water flow by an axial flow pump, increases the water delivery capacity of the midline engineering channel, and solves the problem of insufficient water delivery capacity after the roughness of the channel is increased. The technology has simple steps, reliable results and easy operation, and is an effective way for improving the long-distance water delivery capacity of the open channel.

Disclosure of Invention

Aiming at the problems shown above, the invention provides a method for increasing the flow velocity of water flow by adopting an axial flow pump, which can increase the water delivery capacity of a channel and solve the problem of insufficient water delivery capacity after the roughness of the channel is increased.

In order to achieve the purpose, the invention adopts the following technical scheme:

a water flow accelerating method for a water delivery open channel comprises the following steps:

obtaining the change rate of the design parameters of the water delivery open channel;

determining the current water delivery capacity of the water delivery open channel based on the change rate of the design parameters;

judging whether the current water delivery capacity is qualified, if so, not needing subsequent operation, and otherwise, determining the overflow and the water head to be increased according to the current water delivery capacity;

and (4) calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis.

Preferably, the obtaining of the change rate of the design parameter of the water delivery open channel includes:

collecting initial relevant design and actual measurement data of the water delivery open channel;

analyzing the initial relevant design and the actually measured data to determine the initial design flow, the initial design water level, the initial channel longitudinal slope, the initial section form and the initial roughness coefficient of the water delivery open channel, and counting the initial design flow, the initial design water level, the initial channel longitudinal slope, the initial section form and the initial roughness coefficient as an initial design vector;

determining the current design flow, the current design water level, the current channel longitudinal slope, the current section form and the current roughness coefficient of the water delivery open channel according to the measured data, and counting the current design flow, the current design water level, the current channel longitudinal slope, the current section form and the current roughness coefficient as a current detection vector;

and determining the change rate of the design parameters of the water delivery open channel according to the ratio of the initial design vector to the current detection vector.

Preferably, the determining the current water delivery capacity of the water delivery open channel based on the design parameter change rate includes:

calculating the uniform water flow of the water delivery open channel under the condition of uniform flow and the water passing section area, the wet circumference and the hydraulic radius of the section channel by using a preset hydraulics formula, and obtaining a first calculation result;

evaluating the degree of deviation of the first calculation result according to the change rate of the design parameter;

generating a second calculation result of the water delivery open channel under the current water flow parameter according to the deviation degree of the first calculation result and the first calculation result;

and evaluating the current water delivery capacity of the water delivery open channel according to the second calculation result.

Preferably, whether the current water delivery capacity is qualified is judged, if so, follow-up operation is not needed, otherwise, the overflow and the water head to be increased are determined according to the current water delivery capacity, and the method comprises the following steps:

comparing the current water delivery capacity with the designed water delivery capacity to obtain a comparison result;

if the comparison result is that the current water delivery capacity is greater than or equal to the designed water delivery capacity, subsequent operation is not needed, and if the comparison result is that the current water delivery capacity is smaller than the designed water delivery capacity, the current water delivery capacity is determined to be unqualified;

when the current water delivery capacity is determined to be unqualified, calculating the difference value between the designed water delivery capacity and the current water delivery capacity;

and determining the overflow and the water head to be increased according to the difference value and the maximum water flow of each water head.

Preferably, when judging whether the current water delivery capacity is qualified, if so, no subsequent operation is needed, otherwise, after determining an overflow and a water head to be increased according to the current water delivery capacity, before calculating an open channel water line of the water delivery open channel after the overflow and the water head are increased by adopting a one-dimensional model analysis, the method further comprises the following steps:

determining the channel spacing of the water flow velocity increased by the water delivery open channel according to the flow and the water head to be increased;

acquiring section parameters of the water delivery open channel, and determining a target type of an axial flow pump to be set according to the section parameters and channel spacing of the water delivery open channel for increasing the flow velocity of water flow;

based on the target type, obtaining a plurality of axial flow pump design parameters of the type;

and selecting an adaptive target axial flow pump according to the channel spacing of the water delivery open channel for increasing the flow velocity of the water flow and the design parameters of a plurality of axial flow pumps of the type, and determining the number and the size of the axial flow pumps.

Preferably, the open channel water surface line of the water delivery open channel with the increased overflow and water head is calculated by adopting one-dimensional model analysis, and the method comprises the following steps:

calling hydrological data and time sequence files related to the water delivery open channel;

acquiring a boundary file, a parameter file, a river network file and a section file corresponding to the water delivery open channel;

generating a simulation file according to the boundary file, the parameter file, the river network file, the section file, the hydrological data and the time sequence file, and constructing the one-dimensional model based on the simulation file;

simulating the water flow state of a river or a river mouth through the water delivery open channel by using the one-dimensional model;

calculating the water level and flow of the water delivery open channel at different grid points by adopting a six-point implicit differential format mode;

and drawing an open channel water surface line of the water delivery open channel with the increased overflow and water head according to the water level and flow of the water delivery open channel at different grid points.

Preferably, the method further comprises:

analyzing an open channel water surface line of the water delivery open channel to obtain an analysis result;

generating a longitudinal section pump station arrangement schematic diagram and a cross section arrangement schematic diagram of the water conveying open channel according to the analysis result and the number and the size of the target axial flow pumps;

and uploading the arrangement schematic diagram of the pumping station with the longitudinal section and the arrangement schematic diagram of the cross section to a staff terminal for displaying.

Preferably, the step of determining the number and size of the target axial flow pumps comprises:

establishing a virtual channel model in a preset space based on the initial correlation design;

establishing a virtual water head in the virtual channel model based on the measured data, and constructing a virtual open channel model;

dividing the virtual open channel into a plurality of first sub-channel sections according to the position of the virtual water head in the virtual open channel model;

operating the virtual open channel model, and generating a dynamic detection instruction when the total water flow in the virtual open channel model is less than a standard flow in a preset time period;

controlling the virtual open channel model to operate based on the dynamic detection instruction, and acquiring a first water level line corresponding to each first sub-channel section in the preset time period;

acquiring a first residual water capacity corresponding to each first sub-channel section based on the shape of each first sub-channel section and the first water level line, and acquiring the total residual water capacity of the virtual open channel model;

inputting the total residual water capacity into the virtual open channel model and operating to obtain the water overflow capacity corresponding to each first sub-channel section;

according to the overflow water yield, matching the corresponding first sub-channel section with the first axial flow pump with the corresponding size, and constructing and operating a first virtual detection model;

operating the first virtual detection model, adjusting the position of the first axial flow pump in the corresponding first subsection by a preset step length, and recording the corresponding first overflow water yield when the first axial flow pump is arranged at each position in the first subsection;

obtaining the optimal position of the first axial flow pump when the first overflowing water quantity is minimum, and generating a first optimal result;

constructing and operating a second virtual detection model based on the first optimal result, acquiring second overflow water yield corresponding to each second sub-channel section in the second virtual detection model, and matching the second overflow water yield with a second axial flow pump of a corresponding size for the corresponding second sub-channel section;

obtaining a second optimal result of the second axial pump in the second subsection;

and continuously correcting the virtual detection model until the total overflow water yield of the corrected virtual open channel model is 0, obtaining the current optimal result, and determining the distance, the number and the size of the axial flow pumps.

Preferably, the open channel is divided into a plurality of first sub-channel sections; the step of obtaining a first remaining water capacity corresponding to each first sub-channel section based on the shape of each first sub-channel section and the first water level line comprises:

determining a variation function of the capacity corresponding to the first sub-channel section along with the water level and the total capacity based on the shape of the first sub-channel section;

determining the total water distribution amount corresponding to a front first sub-channel section adjacent to the first sub-channel section and the total water distribution amount corresponding to a rear first sub-channel section;

calculating the water seepage loss corresponding to the first sub-channel section based on the total water distribution corresponding to the first sub-channel section corresponding to the previous first sub-channel section and the total water distribution corresponding to the next first sub-channel section:

in the formula, D is the water seepage loss corresponding to the first sub-channel section, alpha is the water seepage coefficient corresponding to the first sub-channel section, L is the total capacity corresponding to the first sub-channel section, delta is the soil seepage coefficient around the first sub-channel section, beta₁The water seepage loss correction coefficient beta of the first sub-channel section impacted by underground flowing water₂A correction factor W for the water seepage loss of the lining canal of the first sub-canal section₁The total water distribution amount, W, corresponding to the first sub-channel section before the first sub-channel section₂The total water distribution amount corresponding to the next first sub-channel section corresponding to the first sub-channel section; t is t₁The water seepage time corresponding to the first sub-channel section; t is t₂The water seepage time of the soil around the first sub-channel section is obtained;

calculating a first residual water capacity corresponding to the first sub-channel section based on a function of the capacity corresponding to the first sub-channel section along with the variation of the water level, the water seepage loss and the first water level line:

D_rest＝D′(h)-D

in the formula, D_restAnd D' (h) is the initial residual water capacity determined based on the first water level line and the variation function of the capacity along with the water level, and h is the first water level line.

A water delivery open channel flow acceleration system, the system comprising:

the acquisition module is used for acquiring the change rate of the design parameters of the water delivery open channel;

the determining module is used for determining the current water conveying capacity of the water conveying open channel based on the change rate of the design parameters;

the judging module is used for judging whether the current water delivery capacity is qualified or not, if so, subsequent operation is not needed, and otherwise, the overflow and the water head to be increased are determined according to the current water delivery capacity;

and the calculation module is used for calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis.

Preferably, the system further comprises: the detection module divides the open channel into a plurality of second sub-channel sections, each sub-channel section is provided with a detection module, the detection module is used for acquiring the actual open channel information of the second sub-channel section where the detection module is located, and the actual open channel information comprises: actual open channel water quantity information, actual open channel water quality information and actual open channel environment information; the actual open channel water volume information includes: actual open channel water content information, actual water level information, actual open channel water flow information, and actual open channel water flow rate information; the actual open channel environmental information includes: actual second sub-channel section obstacle information and actual second sub-channel section boundary information;

the processing module is electrically connected with the detection module and is used for acquiring open channel position information of the detection module and the corresponding open channel information; the system is used for determining the actual water taking difficulty level of the open channel according to the actual open channel environment information and a preset open channel environment evaluation rule; the system is used for determining the water quality grade of the open channel according to the actual open channel water quality information and a preset open channel water quality evaluation rule; the system comprises a water intake system, a water intake system and a water intake system, wherein the water intake system is used for determining a target water intake scheme according to the actual open channel water quantity information, the actual open channel water intake difficulty level, the open channel water quality level and a preset water intake scheme set, and the target water intake scheme comprises; a water taking pretreatment scheme for the second sub-channel section and the arrangement position of the water taking axial-flow pump on the second sub-channel section;

the prediction module is used for predicting the predicted open channel water content information of the next detection time period according to the actual open channel water content information of the previous detection time period, the actual open channel water content information of the current detection time period, the open channel position information and the actual open channel environment information;

the weather information acquisition module is used for acquiring the weather information of the environment of the open channel, and the weather information comprises: ambient wind speed, ambient temperature;

and the correction module is used for correcting the predicted open channel water content information of the next detection time period based on the climate information acquisition module.

And the scheme determining module is used for determining the arrangement scheme of the water taking axial flow pump and the working parameters of the axial flow pump based on the target water taking scheme, the actual open channel water content information of the current detection time period and the corrected predicted open channel water content information of the next detection time period.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a flow chart of a water flow acceleration method for an open channel of a water delivery system according to the present invention;

FIG. 2 is a schematic cross-sectional view of a typical open channel for water transport in an embodiment of the present invention;

fig. 3 is another working flow chart of the water flow acceleration method for the water delivery open channel provided by the invention;

fig. 4 is another work flow chart of the water flow accelerating method for the water delivery open channel provided by the invention;

FIG. 5 is a schematic diagram illustrating open channel water level calculation according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating an alternative arrangement of water point locations and flow points during calculation of a one-dimensional hydrodynamic model according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a process of solving the Saint-Venen equation set by the one-dimensional hydrodynamic model through the Abbott-Ionescu six-point implicit format according to the embodiment of the invention;

FIG. 8 is a flow chart of a one-dimensional hydrodynamic modeling in an embodiment of the present invention;

FIG. 9 is a water surface line graph of a channel calculated by a one-dimensional hydrodynamic model according to an embodiment of the present invention;

FIG. 10 is a schematic longitudinal section layout of a channel axial-flow pump in an embodiment of the invention;

FIG. 11 is a schematic cross-sectional view of a channel axial-flow pump according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a water flow accelerating system for an open channel of the present invention;

fig. 13 is a model composition diagram of a pump.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.

Water resource space distribution in China is extremely unbalanced, water is more in south and less in north, and water shortage in resource becomes an important factor for restricting economic and social development of China, particularly in north areas. According to statistics, in 669 cities in China, 400 cities have insufficient water supply, and 110 cities have severe water shortage. The long-distance water delivery project is an important water resource optimization configuration project measure for solving the problems of uneven water resource space distribution and resource water shortage in China, and is an important guarantee for water safety in China.

In order to solve the above problems, the present embodiment discloses a method for accelerating the flow of an open channel.

A method for accelerating water flow in an open channel, as shown in fig. 1, comprises the following steps:

s101, obtaining the change rate of design parameters of a water delivery open channel;

s102, determining the current water delivery capacity of the water delivery open channel based on the change rate of the design parameters;

step S103, judging whether the current water delivery capacity is qualified, if so, not needing subsequent operation, and otherwise, determining the overflow and the water head to be increased according to the current water delivery capacity;

and step S104, calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis.

The working principle of the technical scheme is as follows: the method comprises the steps of obtaining the change rate of design parameters of the water delivery open channel, determining the current water delivery capacity of the water delivery open channel based on the change rate of the design parameters, judging whether the current water delivery capacity is qualified, if so, not needing subsequent operation, otherwise, determining the overflow and the water head to be increased according to the current water delivery capacity, and calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis.

The beneficial effects of the above technical scheme are: the water conveying capacity of the water conveying open channel is visually improved by evaluating the current water conveying capacity of the water conveying open channel, determining the overflowing amount and the water head to be increased according to the current water conveying capacity, further setting an axial flow pump to increase the water flow velocity, the whole engineering work efficiency and the experience of workers are improved, and the problems that the water conveying capacity of the channel is greatly reduced and the engineering benefit is influenced due to the fact that conch organisms and the like are attached to the surface of channel concrete in the existing engineering and the engineering roughness is increased to 0.017 from the original design roughness 0.014 are solved.

In one embodiment, the obtaining the design parameter change rate of the water delivery open channel comprises:

collecting initial relevant design parameters of the water delivery open channel;

analyzing the initial relevant design and the measured data to determine the initial design flow, the initial design water level, the initial channel longitudinal slope, the initial section form and the initial roughness coefficient of the water delivery open channel, and counting the initial design flow, the initial design water level, the initial channel longitudinal slope, the initial section form and the initial roughness coefficient as an initial design vector;

carrying out data actual measurement on the water delivery open channel, determining the current design flow, the current design water level, the current channel longitudinal slope, the current section form and the current roughness coefficient of the water delivery open channel according to the actual measurement result, and counting the current design flow, the current design water level, the current channel longitudinal slope, the current section form and the current roughness coefficient as a current detection vector;

determining the change rate of the design parameters of the water delivery open channel according to the ratio of the initial design vector to the current detection vector;

a typical cross-sectional view of the channel is shown in figure 2.

The beneficial effects of the above technical scheme are: the design parameter change rate of the water delivery open channel can be determined more visually and objectively by determining the design parameter change rate of the water delivery open channel according to the ratio of the actual design parameter to the preset design parameter, so that the practicality and the accuracy of an evaluation result are ensured.

In one embodiment, as shown in fig. 3, the determining the current water delivery capacity of the water delivery open channel based on the design parameter change rate comprises:

step S301, calculating the uniform water flow of the water delivery open channel under the condition of uniform flow and the cross-section area, the wet circumference and the hydraulic radius of the water delivery open channel under the condition of uniform flow by using a preset hydraulics formula, and obtaining a first calculation result;

step S302, evaluating the deviation degree of a first calculation result according to the change rate of the design parameters;

step S303, generating a second calculation result of the water delivery open channel under the current water flow parameter according to the deviation degree of the first calculation result and the first calculation result;

step S304, evaluating the current water delivery capacity of the water delivery open channel according to the second calculation result; in this embodiment, considering the uniform flow in the open channel, the flow rate expression is:

Q＝VA (2-1)

according to the property and characteristic of the uniform flow of the open channel, the total head line, the water surface line and the bottom line of the channel are parallel to each other, that is, the total head line, the water surface line and the bottom line of the channel are parallel to each other

J is the water line slope J_p＝i (2-2)

The relation between flow speed and head loss in open channel hydraulic calculation is a multipurpose theory formula

The problem is greatly simplified because the hydraulic gradient J is i when the open channel is in constant and uniform flow

The open channel flow is mostly in the square area of resistance, and the metabolic coefficient C can be calculated by using the Manning formula, namely

The Manning formula is substituted into the thank talent formula to obtain

To sum up, the flow expression of the constant and uniform flow of the open channel is obtained as

For symmetrical trapezoidal section channels, the cross-sectional area of water

A＝(b+mh)h (2-7)

Wet week

Hydraulic radius

Rechecking the current water delivery capacity of the channel according to the hydraulics formula, calculating by adopting a typical section, calculating the current roughness by adopting 0.017, and calculating to obtain the overflow capacity of 286m under the condition that the designed water depth of the riverway is 7m³S, compared to a design flow of 320m³The reduction in/s is 11%. (the flow capacity is 324.6m under the condition of the designed water depth of 7m calculated according to the designed roughness rate of 0.015³/s)。

The beneficial effects of the above technical scheme are: the current water delivery parameter of the water delivery open channel is calculated by utilizing a hydraulics formula so as to evaluate the water delivery capacity of the water delivery open channel, and the current water delivery capacity of the water delivery open channel can be evaluated according to the current water delivery real-time condition of the water delivery open channel, so that the evaluation result is more objective and error-free.

In one embodiment, as shown in fig. 4, determining whether the current water delivery capacity is qualified, if so, no subsequent operation is required, otherwise, determining the overflow and the water head to be increased according to the current water delivery capacity includes:

s401, comparing the current water delivery capacity with a designed water delivery capacity to obtain a comparison result;

step S402, if the comparison result is that the current water delivery capacity is larger than or equal to the design water delivery capacity, no subsequent operation is needed, and if the comparison result is that the current water delivery capacity is smaller than the design water delivery capacity, the current water delivery capacity is determined to be unqualified;

step S403, when the current water delivery capacity is determined to be unqualified, calculating the difference value between the designed water delivery capacity and the current water delivery capacity;

s404, determining an overflow and a water head to be increased according to the difference and the maximum water flow of each water head;

in this embodiment, the normal water depth h is determined by knowing the flow rate Q, the bottom slope i, the roughness n, the cross-sectional shape and the relative dimensions₀.

Obtained by the hydraulic formula

The normal water depth can be solved, which is a problem for solving a nonlinear equation, and the problem can be solved by a trial algorithm, an iteration method, a bisection method and the like. In this embodiment, a trial algorithm is adopted to solve the normal water depth of the section of the trapezoidal channel, that is, assuming a series of water depth values h ', a corresponding flow Q' is calculated, and h 'satisfying Q' is the normal water depth.

The actual river channel design flow is obtained by trial calculation and is 320m³The depth of the river channel corresponding to the water/s is 7.50m, and the average flow velocity of the cross section is 1.10 m/s. If the flow is increased by 30%, the maximum water delivery flow can be increased to 370m³And(s) in the presence of a catalyst. At this time, the consideration cannot be given to the constant and uniform flow of the open channel, but the water depth h of the constant and non-uniform flow of the open channel is h(s), the section area a of the water flow is a (h, s) and the section average flow velocity v is v (h, s) are changed along the flow path, at this time, the hydraulic gradient J is not equal to the bottom slope i, the water depth, the flow and the like cannot be calculated by using the formula (2-6), and an energy equation must be adopted.

According to the energy equation

In the formula: z is a radical of_i、z_i+1The water level (m) of the upper and lower cross sections;

v_i、v_i+1the average flow velocity (m/s) of the upstream and downstream sections;

h_wis the loss of head along the way.

The equation can be used for analyzing and calculating the change of the open channel water level z along the way, and the water level calculation result is shown in figure 4;

z＝z_b+h cosθ (3-3)

to obtain

Subtracting the elevation of the bottom of the canal from the total water head to obtain the specific energy E of the section_sI.e. by

Obtaining the energy equation of the constant flow of the open channel in the form of section specific energy

The interval between the upstream and downstream sections is ds, and the local loss is not counted, then

h_w＝Jds (3-9)

Obtaining basic differential equation of open channel constant gradient flow

Through trial calculation, when the flow is increased to 370m³When the average flow velocity of the downstream section is increased to 1.29m/s in the/s process, the water head is increased to 0.238m, the section specific energy is increased to 0.038m, the on-way water head loss of the open channel water delivery with the length of 5km can be supplemented, namely the channel water delivery capacity is improved, and the channel interval of the water flow velocity is increased by arranging a pump to be 5 km.

The beneficial effects of the above technical scheme are: the excess flow and the water head to be increased are determined according to the difference value and the maximum water flow of each water head, so that the loss water flow of the water delivery open channel can be accurately evaluated, the excess flow and the water head to be increased are rapidly determined, and the practicability is improved.

In one embodiment, the method further includes the steps of determining whether the current water delivery capacity is qualified, if so, not performing subsequent operations, otherwise, after determining an overflow and a head to be added according to the current water delivery capacity, and before calculating an open channel water line of the water delivery open channel after the overflow and the head are added by using a one-dimensional model analysis, wherein the method further includes the steps of:

determining the channel interval of the water flow velocity increased by the water delivery open channel according to the overflow and the water head to be increased;

selecting an adaptive target axial flow pump according to the channel spacing of the water delivery open channel for increasing the flow velocity of water and the design parameters of a plurality of axial flow pumps of the type, and determining the number and the size of the axial flow pumps;

in the embodiment, the purpose of accelerating the water flow of the open channel is realized by adopting the axial flow pump, and the type, model and basic parameters of the axial flow pump are compared and selected according to the regulations in the Medium and Small size axial flow pump type and basic parameters (GB/T9481-;

in the specification, the type of the pump consists of Chinese pinyin capital letters, Arabic numerals and the like, and the specific meanings are shown in the attached figure 13 of the specification;

according to the standard model and basic parameters of the axial flow pump, the following four pump types are selected preliminarily as alternatives:

TABLE 4-1 alternative axial-flow Pump model and basic parameters

The current channel overflowing capacity in the embodiment of the invention is 286m³S, the flow is accelerated by water flow, and the flow can be increased to 370m³S, i.e. the required axial flow pump flow is 84m³And s.

Pump type

1 and 2 design flowsThe amount was 1.445m³S if the supplementary flow rate is 84m³The flow rate of No. 3 and No. 4 pumps is 2.957m³S if the supplementary flow rate is 84m³And/s, about 29 axial flow pumps are required to be arranged. Considering that the flow rate of the No. 3 and No. 4 pump type is about 2 times of the flow rate of the No. 1 and No. 2 pump type, and the shaft power is 1.5 times thereof, and the efficiency of the No. 3 and No. 4 pump type is 85.8%, the efficiency is higher than that of the No. 1 and No. 2 pump type, and therefore, the No. 3 and No. 4 pump type is more suitable from the economical point of view. In addition, the more the number of the axial flow pumps is, the more the influence on the water flow state of the channel is, and the number of the axial flow pumps arranged in the channel is reduced as much as possible;

the basic parameters of the No. 3 pump type and the No. 4 pump type are completely consistent, and the difference is that the No. 3 pump type is a vertical axial flow pump, and the No. 4 pump type is a horizontal axial flow pump. Considering that the water blocking area of the vertical axial-flow pump in water is larger than that of the horizontal axial-flow pump, and the included angle between the water outlet direction and the water flow direction is also larger, the No. 4 pump type is selected as the pump type of the axial-flow pump in the embodiment of the invention.

The beneficial effects of the above technical scheme are: the most appropriate axial flow pump can be selected according to the actual water delivery condition of the water delivery open channel by selecting the adaptive target axial flow pump and determining the number and the size of the adaptive target axial flow pumps, so that the working efficiency of the axial flow pump is maximized while the water delivery efficiency is improved.

In one embodiment, the method for calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis comprises the following steps:

drawing an open channel water surface line of the water delivery open channel with increased overflow and water head according to the water level and flow of the water delivery open channel at different grid points;

in this embodiment, MIKE 11HD is a system of one-dimensional unsteady flow Saint-Venant equations (Saint-Venant) based on vertically integrated material and momentum conservation equations to simulate the flow conditions of a river or estuary. The specific form of the equation set is as follows:

in the formula: x and t are respectively a space coordinate and a time coordinate; q and h are respectively the section flow and the water level; a and R are respectively a cross-section flow area and a hydraulic radius; b is_sIs the width of the river; q is the side inlet flow; c is a metabolic factor; g is the acceleration of gravity; α is the vertical velocity profile, i.e.

Where u is the cross-sectional average flow velocity.

The discrete method comprises the following steps:

MIKE 11HD is solved using Abbott-Ionescu six-point implicit difference format. This format does not calculate the water level and flow rate at each grid point at the same time, but alternately calculates the water level or flow rate in sequence, referred to as h point and Q point, respectively, as shown in fig. 6;

in the continuity equation, Q only makes a partial derivative for x, centered on the water level point h, while the momentum equation is centered on the flow point Q, as shown in fig. 7;

the discrete form of the continuity equation is as follows:

the discrete form of the momentum equation is as follows:

and solving the dispersed linear equation set by a catch-up method.

The modeling flow of Mike 11HD is shown in fig. 8, and the water line calculation result is shown in fig. 9.

The beneficial effects of the above technical scheme are: the open channel water line of the water delivery open channel can be accurately drawn according to the water level and the flow, so that the water delivery effect after the axial flow pump is added can be visually evaluated, and a basis is provided for subsequent staff to make decisions.

In one embodiment, the method further comprises:

uploading the arrangement schematic diagram of the pump station with the longitudinal section and the arrangement schematic diagram of the cross section to a staff terminal for displaying;

in the embodiment, the calculated results are analyzed, the pump acceleration of the channel section is set at intervals of 5km, and 29 axial flow pumps with the diameter of about 1m are arranged on each section, wherein the model is 1000 ZWQ-5.7. The pump station layout diagram of the channel longitudinal section is shown in figure 10, and the pump station layout diagram of the channel longitudinal section is shown in figure 11.

The beneficial effects of the above technical scheme are: through generating the pump station arrangement schematic diagram and the cross section arrangement schematic diagram of the longitudinal section of the water conveying open channel, the staff can provide a reference foundation for the arrangement of the axial flow pump, and the working efficiency is improved.

In one embodiment, the step of determining the number and size of the target axial flow pumps comprises:

inputting the total residual water capacity into the virtual open channel model and operating to obtain the overflow water capacity corresponding to each first sub-channel section;

continuously correcting the virtual detection model until the total overflow water yield of the corrected virtual open channel model is 0, obtaining the current optimal result, and determining the distance, the number and the size of the axial flow pumps;

in this example, the relevant design represents the design of the exterior of the water delivery open channel;

in this example, the measured data represents data on actual measurement of the water delivery open channel by personnel;

in this example, the virtual open channel model represents a virtual object that is built in a virtual space and has the same function and property as the actual open channel by scaling down the actual open channel in equal proportion according to the relevant design and the measured data;

in this example, the first sub-channel segment represents a channel between two adjacent virtual heads in the virtual open channel model;

in this example, the preset time period may be one hour, and the inspector may adjust the preset time period according to the inspection requirement;

in this example, the water level line represents the height of water in the sub-channel section;

in this example, the two residual water volumes represent the maximum water volume that can be accommodated by the residual space in the sub-channel section or the virtual open channel model;

in this example, one correction operation is to place one axial flow pump for the corresponding sub-channel section.

The beneficial effects of the above technical scheme are: through establishing virtual open channel model, simulate the flow situation of actual rivers in virtual open channel model, in order to improve the water delivery capacity of open channel, adjust the position of axial-flow pump on the canal body according to the maximum volume water yield of open channel, realize the maximize utilization in open channel space, simultaneously, set up the axial-flow pump of different sizes on the canal body according to the overflow situation of difference, both reached the purpose that improves the water delivery capacity, can also resources are saved, avoid extravagant.

In one embodiment, the open channel is divided into a plurality of first sub-channel sections; the step of obtaining a first remaining water capacity corresponding to each first sub-channel section based on the shape of each first sub-channel section and the first water level line comprises:

in the formula, D is the seepage water loss amount that first sub-canal section corresponds and D's unit are for rising, alpha is the seepage water coefficient that first sub-canal section corresponds (unit is L/min), L is total capacity that first sub-canal section corresponds and L's unit are for rising, delta is the soil seepage water coefficient around first sub-canal section, beta₁The water seepage loss correction coefficient beta of the first sub-channel section impacted by underground flowing water₁Is dimensionless, beta₂Correcting coefficient for water seepage loss of lining channel of the first sub-channel section and beta₂Is dimensionless, W₁The total water distribution amount W corresponding to the first sub-channel section before the first sub-channel section₁Unit of (a) is liter, W₂The total water distribution amount W corresponding to the next first sub-channel section corresponding to the first sub-channel section₂Unit of (d) is liter; t is t₁The water seepage time corresponding to the first sub-channel section; t is t₂The water seepage time of the soil around the first sub-channel section is obtained;

D_rest＝D′(h)-D

in the formula, D_restA first residual water capacity D corresponding to the first sub-channel section_restD' (h) is the initial remaining water capacity determined based on the first water line and the function of the change in capacity with water level in units of liters, h is the first water line and h in units of meters.

The beneficial effects of the above technical scheme are: the corresponding water seepage loss amount can be accurately calculated through the water seepage coefficient, the total capacity, the surrounding soil water seepage coefficient, the water seepage loss correction coefficient impacted by underground flowing water and the lining channel water seepage loss correction coefficient corresponding to the first sub-channel section, the change function of the capacity corresponding to the first sub-channel section along with the water level, the water seepage loss amount and the first water level line can accurately calculate the first residual water capacity corresponding to the first sub-channel section, so that the influence of the surrounding water seepage effect is considered for the obtained first residual water capacity, the influence of the morning song water seepage effect impacted by underground flowing water and the lining channel water seepage loss is also considered, and the obtained first residual water capacity is more accurate.

The present embodiment also discloses a flow accelerating system for open channel, as shown in fig. 12, the system includes:

an obtaining module 1201, configured to obtain a change rate of a design parameter of the water delivery open channel;

a determining module 1202, configured to determine a current water delivery capacity of the water delivery open channel based on the design parameter change rate;

a judging module 1203, configured to judge whether the current water delivery capacity is qualified, if so, no subsequent operation is needed, and otherwise, an overflow and a water head to be increased are determined according to the current water delivery capacity;

and the calculating module 1204 is used for calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis.

The working principle and the beneficial effect of the above technical solution have been described in the method embodiment, and are not described herein again.

In one embodiment, the system further comprises:

the detection module divides the open channel into a plurality of second sub-channel sections, each sub-channel section is provided with a detection module, the detection module is used for acquiring the actual open channel information of the second sub-channel section where the detection module is located, and the actual open channel information comprises: actual open channel water quantity information, actual open channel water quality information and actual open channel environment information; the actual open channel water volume information includes: actual open channel water content information, actual water level information, actual open channel water flow information, and actual open channel water flow rate information; the actual open channel environmental information includes: actual second sub-channel section obstacle information and actual second sub-channel section boundary information;

The working principle and the beneficial effects of the technical scheme are as follows: dividing the open channel into a plurality of second sub-channel sections, wherein each sub-channel section is provided with a detection module, the detection module is used for acquiring the actual open channel information of the second sub-channel section where the detection module is located, before water is fetched, the open channel information of each associated second sub-channel section is acquired according to the position of a required water delivery destination, and the actual open channel information comprises: actual open channel water quantity information, actual open channel water quality information and actual open channel environment information; the actual open channel water volume information includes: actual open channel water content information, actual water level information, actual open channel water flow information, and actual open channel water flow rate information; the actual open channel environmental information includes: actual second sub-channel section obstacle information and actual second sub-channel section boundary information; the influence of the water content information, the water quality information and the environmental information of the second sub-channel section is comprehensively considered, so that the formulated water taking scheme is more reliable.

The processing module is used for determining the actual water taking difficulty level of the open channel according to the actual open channel environment information and a preset open channel environment evaluation rule; the system is used for determining the water quality grade of the open channel according to the actual open channel water quality information and a preset open channel water quality evaluation rule; the system comprises a water intake system, a water intake system and a water intake system, wherein the water intake system is used for determining a target water intake scheme according to the actual open channel water quantity information, the actual open channel water intake difficulty level, the open channel water quality level and a preset water intake scheme set, and the target water intake scheme comprises; a water taking pretreatment scheme for the second sub-channel section and the arrangement position of the water taking axial-flow pump on the second sub-channel section; specifically, a target water taking scheme is determined according to the actual open channel water quantity information, the actual open channel water taking difficulty level, the open channel water quality level and a preset water taking scheme set, wherein the target water taking scheme comprises the following steps of; a water taking pretreatment scheme for the second sub-channel section and the arrangement position of the water taking axial-flow pump on the second sub-channel section; the water taking effect is guaranteed by the aid of the water taking pretreatment corresponding to the water content, the water quality grade and the water taking grade, the arrangement positions of the axial flow pumps corresponding to the water content, the water quality grade and the water taking grade are realized, and arrangement of the axial flow pumps is facilitated.

The prediction module is used for predicting the predicted open channel water content information of the next detection time period; the axial flow pump is set in consideration of the dynamic change of the water content; and the correction module is used for correcting the predicted open channel water content information of the next detection time period based on the climate information acquisition module. The water content is corrected according to the climate influence, and the result is ensured to be reliable;

and the final scheme determining module is used for determining the arrangement scheme of the water taking axial-flow pump and the working parameters of the axial-flow pump based on the target water taking scheme, the actual open channel water content information of the current detection time period and the corrected predicted open channel water content information of the next detection time period, and intelligently acquiring the arrangement scheme of the axial-flow pump actually matched with the channel and the working parameters of the axial-flow pump based on detection.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A water flow accelerating method for a water delivery open channel is characterized by comprising the following steps:

and (4) calculating the open channel water surface line of the water delivery open channel after the overflow and the water head are increased by adopting a one-dimensional model analysis.

2. The method of accelerating flow in an open channel of claim 1, wherein said obtaining a rate of change of design parameters of the open channel comprises:

3. The method of accelerating flow of water transport open channel of claim 1, wherein said determining a current water transport capacity of a water transport open channel based on said rate of change of design parameters comprises:

evaluating the current water delivery capacity of the water delivery open channel according to the second calculation result;

judging whether the current water delivery capacity is qualified, if so, not needing subsequent operation, otherwise,

determining the overflow and the water head to be increased according to the current water delivery capacity, comprising:

4. The method for accelerating the flow of water in the water delivery open channel according to claim 1, wherein the method comprises the steps of judging whether the current water delivery capacity is qualified, if so, not performing subsequent operation, and if not, determining the overflow and the water head to be increased according to the current water delivery capacity, and before calculating the open channel water line of the water delivery open channel after the overflow and the water head are increased by adopting one-dimensional model analysis, wherein the method further comprises the steps of:

5. The method for accelerating the flow of water transporting open channel according to claim 1, wherein the calculating of the open channel water surface line of the water transporting open channel after the increase of the overflow and the water head by using the one-dimensional model analysis comprises:

6. The method of accelerating flow of a water transport open channel of claim 4, further comprising:

and uploading the arrangement schematic diagram of the pump station with the longitudinal section and the arrangement schematic diagram of the cross section to a staff terminal for displaying.

7. The method of accelerating flow in open channel water transport of claim 2, wherein the step of determining the number and size of the target axial flow pumps comprises:

8. The method according to claim 1, wherein the open channel is divided into a plurality of first sub-channel sections; the step of obtaining a first remaining water capacity corresponding to each first sub-channel section based on the shape of each first sub-channel section and the first water level line comprises:

based on the total water distribution amount corresponding to the first sub-channel section in the front and the total water distribution amount corresponding to the first sub-channel section in the back, calculating the water seepage amount corresponding to the first sub-channel section:

D_rest＝D′(h)-D

in the formula, D_restCorresponding to said first sub-channel sectionThe first remaining water capacity, D' (h), is the initial remaining water capacity determined based on the first water level line and the function of the capacity as a function of the water level, and h is the first water level line.

9. A water transport open channel flow acceleration system operating in accordance with the method of any one of claims 1 to 8, the system comprising:

10. The open channel flow accelerating system of claim 9, further comprising:

the processing module is electrically connected with the detection module and is used for acquiring open channel position information of the detection module and the corresponding open channel information; the system is used for determining the actual water taking difficulty level of the open channel according to the actual open channel environment information and a preset open channel environment evaluation rule; the system is used for determining the water quality grade of the open channel according to the actual open channel water quality information and a preset open channel water quality evaluation rule; the system is used for determining a target water taking scheme according to the actual open channel water quantity information, the actual water taking difficulty grade of the open channel, the water quality grade of the open channel and a preset water taking scheme set, wherein the target water taking scheme comprises the following steps of; a water taking pretreatment scheme for the second sub-channel section and the arrangement position of the water taking axial-flow pump on the second sub-channel section;

the climate information acquisition module is used for acquiring climate information of an environment where the open channel is located, and the climate information comprises: ambient wind speed, ambient temperature;

the correction module is used for correcting the predicted open channel water content information of the next detection time period based on the climate information acquisition module;