CN114971191A - Multi-water-source pipe network water quality evaluation method based on node water age - Google Patents
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Abstract
The invention discloses a multi-water-source pipe network water quality evaluation method based on node water age, which comprises the following steps: screening out water quantity non-zero data; dividing the range of the single water supply area of each water source and the mixed water supply area of multiple water sources; obtaining the node quantity weight value and the comprehensive weighted water age of the pipe network; performing water age simulation analysis on a given pipe network to obtain node water age values of all water using nodes, and calculating by regions to obtain flow weighted average water age; and repeating the steps, drawing a comprehensive water age chart of pipe network areas in different schemes, and evaluating the water quality of the whole pipe network. The method is used for performing tracing analysis on a multi-water-source water supply network respectively under different working conditions, dividing single and multi-water-source mixed water supply ranges, then calculating comprehensive weighted water age values under corresponding working conditions, and finally performing effect comparison under different working conditions, so that reference evaluation basis can be provided for regional water age change possibly caused by regulating and controlling water pressure by water utilities staff, and therefore safety of drinking water in the mixed water supply range is guaranteed.
Description
Technical Field
The invention relates to a water quality evaluation method for a multi-water-source water supply network, in particular to a method for comparing and evaluating water quality conditions corresponding to different water pressure regulation schemes of a multi-water-source water supply system based on node water age.
Background
In the urban and rural integrated construction process, the conversion from an independent water supply mode to a multi-water-source water supply mode is an important trend of urban infrastructure development. Compared with an independent water supply network, the multi-water-source water supply system has the characteristics of long pipeline, more water sources, more complex operation condition and the like, and the biggest difference is that one or more water supply mixing areas with various incoming water must exist in the multi-water-source water supply network system.
By utilizing the built-in function of the EPANET software, the source tracing and water age analysis can be performed on the water supply pipe network model, the mixed area in the pipe network and the tip position of the pipe network are relatively far away from a water source, and the problems of overlong water age and low residual chlorine exist. As for the method for representing the water quality in the water supply network by using the water age, the absolute value of the node water age and the weighted average value of the node water age relative to the node flow are selected as indexes to evaluate the water quality condition in the pipe network, and the comprehensive water age index is adopted to carry out multi-objective optimization scheduling under the condition of different partition methods. The special water supply distribution zoning condition of the multi-water-source pipe network and the attention degree of the urban water supply pipe network modeling to different water using nodes and pipe sections are considered, and the proper water quality evaluation method is provided, so that the hydraulic dispatching is facilitated, and the comprehensive water quality of the multi-water-source pipe network is improved.
Disclosure of Invention
The invention aims to evaluate the comprehensive water quality condition of a pipe network under the condition of the change of a mixing area of a multi-water-source water supply pipe network, and provides a multi-water-source pipe network water quality evaluation method based on node water age, which can help water service workers to more effectively regulate and control the delivery pressure of a plurality of water plants and adjust the geographical position of the mixing area in the multi-water-source pipe network, thereby improving the comprehensive water quality of the multi-water-source water supply pipe network.
In order to realize the aim, the invention provides a multi-water-source pipe network water quality evaluation method based on node water age, which comprises the following steps:
(1) performing source tracing analysis on a given pipe network to obtain water consumption ratio data of water consumption of each water consumption node from different water sources, and screening out non-zero water consumption data;
(2) determining the water supply range of each water source according to the screened water amount ratio non-zero data, and dividing the range of the single water supply area and the multi-water-source mixed water supply area of each water source;
(3) performing water age simulation analysis on a given pipe network to obtain node water age values of all water using nodes, and calculating by regions to obtain flow weighted average water age;
(4) determining the number of water use nodes of each area and the number of water use nodes of the whole pipe network according to the subareas to obtain node number weight values, and combining flow weighted average water age to obtain comprehensive weighted water age of the pipe network areas;
(5) and (4) repeatedly performing the steps by adopting different pressure differences, analyzing the flow weighted average water age in the mixed water supply area, drawing a comprehensive water age chart of the pipe network area in different schemes, and evaluating the water quality of the whole pipe network.
In the steps, the method carries out traceability analysis and water age simulation analysis on the water supply network under the control of different water source total water head combination schemes, divides water supply areas, obtains area comprehensive weighted water ages by calculating the water quantity weighted water ages and node quantity weighted values of the water supply areas, then evaluates the comprehensive water quality of the water supply network, and finally judges the water source total water head combination scheme of the optimal comprehensive water quality according to the area comprehensive weighted water age values.
The step (1) comprises the following steps:
1.1) leading a given pipe network model into EPANET software, and setting the total head value of each water source node;
1.2) setting the type of water quality simulation as source tracing analysis, and setting the total time length t hours of the water quality simulation;
1.3) sequentially setting each water source node as a tracked target node, and acquiring water volume proportion data of each water consumption node at the time t;
1.4) screening out the water consumption node with the water consumption of 0 in the data, and reserving the data with non-zero water consumption.
The total water quality simulation time t hour set in the step (1) has different values for water supply networks with different complexity, and the values are such that the simulation result can show stable periodic variation and is generally not less than the set total time of the time sequence. the value of t can be 24h as a step size and is more than or equal to 168h (7 d).
In the step (2), the water volume ratio threshold value is set to be w% according to the actual situation, if the water volume ratio of the water consumption node is higher than w%, the water consumption node is classified as the water supply area range of the corresponding water source node, and if not, the water consumption node is classified as the multi-water-source mixed water supply area.
In the step (3), the given pipe network model and parameters in the step (1) are kept unchanged, the type of water quality simulation is changed into water age analysis, the total time length t hours of the water quality simulation is set, and the node water age of each water using node at the time t is obtained.
In the step (3), water age simulation analysis is carried out on the given pipe network, initial data obtained by utilizing EPANET software to carry out water age simulation is node water age, and the node water age T i The formula of (1) is:
in the formula:
the water quantity is used for conveying water from a water source to the nth water supply path through which the node i flows;
time for water to travel from the water source to node i along the nth water supply path; u shape i A set of water supply paths for water to all sources of node i.
In the step (3), the water ages of the nodes in the corresponding ranges and the region division in the step (2) are utilized to calculate the water volume weighted water ages in different regionsT m The formula is as follows:
in the formula: q. q.s i The water quantity of the water using node i in the mth area; t is a unit of i And the water age of each node of the water consumption nodes in the m-th area.
In the step (4), the number of water consumption nodes in each area and the number of water consumption nodes for the whole pipe network are determined, and the weight value eta of the number of nodes is determined m The formula of (1) is:
in the formula: n is m The number of the water consumption nodes in the mth area is shown; and N is the total water consumption node number of all the areas of the pipe network.
In step (4), the regional comprehensive weighted water age assessment (T) z ) The formula of (1) is:
T z ＝∑η m T m
in the step (5), the steps are repeatedly carried out by adopting different water source total head value combination schemes, and the weighted average water age T of the flow in each area of the pipe network under different scheme conditions is obtained m Water age T integrated with region z 。T z The smaller the water quality is, the better the whole water quality of the multi-water-source pipe network is, wherein different schemes are selected to be the mixed water supply area T m Minimum, minor and regional comprehensive water age T z The minimum corresponding scheme is optimal, and the water quality of the whole pipe network is not degraded while the water quality guarantee of the mixed water supply area is achieved.
Compared with the prior art, the invention has the beneficial effects that:
the invention considers the attention degree of different water consumption nodes and the distribution density of drinking water users in different areas of a city during modeling. The invention provides a multi-water-source pipe network water quality evaluation method based on node water age.
The method provided by the invention respectively performs multi-water-source water supply pipe network tracing analysis on different working conditions, divides single and multi-water-source mixed water supply ranges, then calculates the comprehensive weighted water age value under the corresponding working conditions, and finally performs effect comparison on different working conditions, so that reference evaluation basis can be provided for regional water age change possibly caused by regulating and controlling water pressure by water staff, and the safety of drinking water in the mixed water supply range is guaranteed.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of a pipe network according to an embodiment;
FIG. 3 is a regional comprehensive weighted water age histogram for different water source total head combination schemes;
fig. 4 is a schematic diagram of water supply zones for different optimal water pressure difference schemes.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
the present invention will be described in detail with reference to embodiments shown in the drawings.
As shown in figure 1, the multi-water-source pipe network water quality evaluation method based on the node water age comprises the following steps:
(1) performing source tracing analysis on a given pipe network to obtain water consumption ratio data of water consumption of each water consumption node from different water sources, and screening out non-zero water consumption data;
(2) determining the water supply range of each water source according to the screened water amount proportion non-zero data, and dividing the range of the single water supply area and the multi-water-source mixed water supply area of each water source;
(3) performing water age simulation analysis on a given pipe network to obtain node water age values of all water using nodes, and calculating by regions to obtain flow weighted average water age;
(4) determining the number of water use nodes of each area and the number of water use nodes of the whole pipe network according to the subareas to obtain node number weight values, and combining flow weighted average water age to obtain comprehensive weighted water age of the pipe network areas;
(5) and (4) repeatedly performing the steps by adopting different pressure differences, analyzing the flow weighted average water age in the mixed water supply area, drawing a comprehensive water age chart of the pipe network area in different schemes, and evaluating the water quality of the whole pipe network.
The step (1) comprises the following steps:
1) leading the given pipe network model into EPANET software, and setting the total head value of each water source node;
2) setting the type of water quality simulation as source tracing analysis, and setting the total time of water quality simulation for t hours;
3) and sequentially setting each water source node as a tracked target node, and acquiring water volume ratio data of each water consumption node at the time t.
4) And (4) screening out the water consumption node with the water consumption of 0 in the data, and reserving the non-zero data of the water quantity.
The total water quality simulation time t hour set in the step (1) has different values for water supply networks with different complexity, and the values are such that the simulation result can show stable periodic variation and is generally not less than the set total time of the time sequence. the value of t can be 24h as a step length and is more than or equal to 168h (7 d).
In the step (2), the water volume ratio threshold value is set to be w% according to the actual situation, if the water volume ratio of the water consumption node is higher than w%, the water consumption node is classified as the water supply area range of the corresponding water source node, and if not, the water consumption node is classified as the multi-water-source mixed water supply area.
In the step (3), the given pipe network model and parameters in the step (1) are kept unchanged, the type of water quality simulation is changed into water age analysis, the total time length t hours of the water quality simulation is set, and the node water age of each water using node at the time t is obtained.
In the step (3), water age simulation analysis is carried out on the given pipe network, initial data obtained by utilizing EPANET software to carry out water age simulation are node water age and node water age T i The formula of (1) is:
in the formula：
The water quantity is used for conveying water from a water source to the nth water supply path through which the node i flows;
time for water to travel from the water source to node i along the nth water supply path; u shape i A set of water supply paths for water to all sources of node i.
In the step (3), the water ages T of the nodes in the corresponding ranges and the region division in the step (2) are utilized to calculate the water quantity weighting water ages T in different regions m The formula is as follows:
in the formula: q. q.s i The water quantity of the water using node i in the mth area; t is i And the water age of each node of the water consumption nodes in the m-th area.
In the step (4), the number of water consumption nodes in each area and the number of water consumption nodes for the whole pipe network are determined, and the weight value eta of the number of nodes is determined m The formula of (1) is:
in the formula: n is m The number of the water consumption nodes in the mth area is shown; and N is the total water consumption node number of all the areas of the pipe network.
In step (4), the regional comprehensive weighted water age assessment (T) z ) The formula of (1) is:
T z ＝∑η m T m
in the step (5), the steps of the claims 2 to 7 are repeatedly carried out by adopting different water source total head value combination schemes, and the weighted average water age T of the flow in each area of the pipe network under the conditions of different schemes is obtained m Water age T integrated with region z 。T z The smaller the water quality is, the better the integral water quality of the multi-water-source pipe network is, wherein different schemesMixing water supply zone T for preference m Minimum, minor and regional comprehensive water age T z The minimum corresponding scheme is optimal, and the water quality of the whole pipe network is not degraded while the water quality guarantee of the mixed water supply area is achieved.
As shown in FIG. 2, the water supply network in Huzhou city is taken as an example to illustrate the effect of the present invention. The pipe network model has 15891 water consumption nodes, 16579 pipe sections and 2 water sources. The method for analyzing the comprehensive water quality condition of the pipe network under different pressure difference schemes comprises the following steps:
the first step is as follows: firstly, a pipe network model is led into EPANET software, the total water head value of a water source node with the number R-1 is set to be 33, and the total water head value of a water source node with the number R-3 is set to be 37. Secondly, setting the total water quality simulation time length to be 168 hours, the hydraulic step length to be 1 hour and the water quality simulation step length to be 15 min. Then, setting the water quality simulation type as tracing analysis (trace), and setting the water source node with the number of R-3 as a traced target node, so as to obtain the percentage of water consumption of each water consumption node in the pipe network from the water source node R-3 when the water quality simulation is stable at 168 hours; and setting the water source node with the number of R-1 as a target node in the pursuit, and obtaining the percentage of the water source node R-1 in the water consumption of each water using node in the pipe network at 168 hours. And finally, obtaining water volume ratio data of each water using node of the pipe network under the scheme that the total water head combination of the water source is 33-37, namely the pressure difference is 4 at 168 hours. Because the model is simple, the water volume ratio data of the water nodes of the whole pipe network can be obtained only by carrying out source tracing analysis on one of the water source nodes. Planning water consumption nodes with the water consumption more than or equal to 0.005LPS as effective nodes, and finally screening to obtain 15535 effective water consumption nodes.
The second step: firstly, setting a threshold value of a water supply range partition to be 80%, and artificially defining that when no less than 80% of water consumption of a node comes from a certain water source, the node is considered to belong to a single water supply area of the water source; secondly, the water using nodes which do not belong to a single water supplying area of a certain water source are gathered into a water supplying mixing area. To this end, the pipe network is divided into 3 zones, namely a single water supply zone of the water source node R-1, a single water supply zone of the water source node R-3 and a water supply mixing zone, which are sequentially called as a '1 st zone', a '2 nd zone' and a '3 rd zone'.
The third step: determining the number n of water consumption nodes in the ranges of ' 1 st zone ', ' 2 nd zone ' and ' 3 rd zone 1 ,n 2 ,n 3 The number N of the water nodes used integrally with the pipe network is obtained to obtain the weight value eta of the number of the nodes 1 ,η 2 ,η 3 Weighting the water age T according to the water quantity obtained in the third step 1 ，T 2 ，T 3 Obtaining regional comprehensive weighted water age T z ；
The fourth step: changing the water quality simulation type into water age analysis (age), wherein the total water quality simulation time is 168 hours, and analyzing the water quality of the water supply pipe network to obtain the water age T of each water consumption node at 168 hours i . Then, according to the water age data of the 3 region division water nodes in the second step, the water quantity weighted water age T is calculated for the water nodes in the range of the 1 st region, the 2 nd region and the 3 rd region 1 ，T 2 ，T 3 。
The fifth step: repeating the first step to the fourth step by adopting different total head difference combination schemes, wherein in the example, the total head value combination scheme of 5 groups of pressure difference combination schemes, the total head value combination scheme of the water source nodes R-1 and R-3 and the weight values eta of the corresponding node numbers are adopted m And flow weighted average age T m The calculation results are shown in table 1. A comprehensive weighted water age map of different project areas is plotted as shown in fig. 3. According to T 1 Analysis of results shows that the scheme of preliminarily determining that the solution is better when the solution is Delta H-2 and T is better 1 29.54 h; the comprehensive water age of the corresponding area of the scheme is 12.23H, and finally the delta H under the optimal scheme is determined to be 2.
TABLE 1 evaluation results of water ages of various areas of pipe network in different schemes
Claims (8)
1. A multi-water-source pipe network water quality evaluation method based on node water age is characterized by comprising the following steps:
(1) performing source tracing analysis on a given pipe network to obtain water consumption ratio data of water consumption of each water consumption node from different water sources, and screening out non-zero water consumption data;
(2) determining the water supply range of each water source according to the screened water amount ratio non-zero data, and dividing the range of the single water supply area and the multi-water-source mixed water supply area of each water source;
(3) performing water age simulation analysis on a given pipe network to obtain node water age values of all water using nodes, and calculating by regions to obtain flow weighted average water age;
(4) determining the number of water nodes for each area and the number of water nodes for the whole pipe network according to the subareas to obtain a node number weight value, and combining the flow weighted average water age to obtain the comprehensive weighted water age of the pipe network area;
(5) and (4) repeatedly performing the steps by adopting different pressure differences, analyzing the flow weighted average water age in the mixed water supply area, drawing a comprehensive water age chart of the pipe network area in different schemes, and evaluating the water quality of the whole pipe network.
2. The method for evaluating the water quality of the multi-water-source pipe network based on the node water age as claimed in claim 1, wherein the step (1) specifically comprises the following steps:
(1.1) leading a given pipe network model into EPANET software, and setting the total head value of each water source node;
(1.2) setting the type of water quality simulation as source tracing analysis, and setting the total time of water quality simulation for t hours;
(1.3) sequentially setting each water source node as a tracked target node, and acquiring water volume proportion data of each water consumption node at the time t;
and (1.4) screening out the water consumption node with the water consumption of 0 in the data, and reserving the data with non-zero water consumption.
3. The method for evaluating the water quality of the multi-water-source pipe network based on the node water age according to claim 1, wherein in the step (2), the water supply range of each water source is determined according to the screened water volume proportion non-zero data, and the range of the single water supply area and the multi-water-source mixed water supply area of each water source is divided, specifically comprising:
setting the water quantity ratio threshold as w% according to actual conditions, if the water consumption node water quantity ratio is higher than w%, classifying the water consumption node water quantity ratio into the water supply area range of the corresponding water source node, and otherwise classifying the water consumption node water quantity ratio into the multi-water-source mixed water supply area.
4. The method for evaluating the water quality of the multi-water-source pipe network based on the node water age according to claim 1, wherein in the step (3), the water age simulation analysis is performed on the given pipe network to obtain the node water age values of all the water-using nodes, and the method specifically comprises the following steps:
keeping a given pipe network model with the total head value of each water source node set unchanged, setting the type of water quality simulation as water age analysis, setting the total time length t hours of the water quality simulation, and obtaining the node water age of each water node at the time t.
5. The method for evaluating the water quality of the multi-water-source pipe network based on the node water age as claimed in claim 1, wherein in the step (3), the node water age T i The formula of (1) is:
in the formula:
the water quantity is used for conveying water from a water source to the nth water supply path through which the node i flows;
time for water to travel from the water source to node i along the nth water supply path; u shape i A set of water supply paths for water to all sources of node i.
6. The multi-water-source pipe network water quality evaluation method based on node water age as claimed in claim 1, wherein in step (3), the flow weighted average water age T m The formula of (1) is:
in the formula: q. q.s i The water quantity of the water using node i in the mth area; t is i And the water age of each node of the water consumption nodes in the m-th area.
7. The method for evaluating the water quality of the multi-water-source pipe network based on the node water age as claimed in claim 1, wherein in the step (4), the node number weight value η m The formula of (1) is:
in the formula: n is m The number of the water consumption nodes in the mth area is shown; and N is the total water consumption node number of all the areas of the pipe network.
8. The multi-water-source pipe network water quality evaluation method based on node water age as claimed in claim 1, wherein in step (4), the pipe network area comprehensively weights the water age T z The formula of (1) is:
T z ＝∑η m T m
wherein, T m The average age is weighted for flow.
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| CN116562600A (en) * | 2023-07-11 | 2023-08-08 | 中关村科学城城市大脑股份有限公司 | Water supply control method, device, electronic equipment and computer readable medium |
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| CN116562600B (en) * | 2023-07-11 | 2023-09-19 | 中关村科学城城市大脑股份有限公司 | Water supply control method, device, electronic equipment and computer readable medium |
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