JP2788400B2 - Hydraulic analysis method of water distribution network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic analysis method for a water distribution network for efficiently performing maintenance work, such as extension work, maintenance, and response to emergencies.
Generate a water volume model extracted from each node of the distribution network to be analyzed, and use a computer to calculate hydraulic data such as each node head and each pipeline flow of the distribution network with respect to the extracted water volume model. The present invention relates to a hydraulic analysis method for a water distribution network to be derived.

[0002]

2. Description of the Related Art Conventionally, a water amount pattern obtained by proportionally distributing a water amount pattern actually taken out from a water source with an actual water taken out from each node obtained from meter reading water amount data,
Approximately as the withdrawal water model, by performing hydraulic analysis each time with respect to the withdrawal water amount specified by the withdrawal water amount model specified by the withdrawal water amount model, each node head and each pipeline flow rate of the distribution pipe network The hydraulic data for each predetermined time such as the above was calculated and derived. For example, when examining hourly changes in the daily water volume pattern, it was necessary to execute a total of 24 hydraulic analyzes.

[0003]

However, according to the above-mentioned conventional hydraulic analysis method for a water distribution network, a computer is used each time with respect to the amount of water taken out at every predetermined time specified by the model of the amount of water taken out. Hydraulic analysis must be performed, which is time-consuming. This drawback increases as the scale of the distribution pipe network to be analyzed increases, and has a drawback that it cannot be put to practical use assuming daily work. An object of the present invention is to eliminate the above-mentioned conventional disadvantages.

[0004]

In order to achieve this object, a characteristic structure of the hydraulic analysis method for a water distribution network according to the present invention is characterized in that a water amount pattern actually taken out from a water source is calculated from each node obtained from meter reading water amount data. The water volume pattern obtained by proportionally distributing the actual water volume is approximated as the water volume model, and a hydraulic analysis is performed on the water volume at an arbitrary time specified by the approximated water volume model. The hydraulic data obtained by the physical analysis is converted into hydraulic data at the specific time by converting the hydraulic data at the specific time specified by the approximated water model.

[0005]

[Effect] Under the assumption that the water amount pattern taken out from each node is similar to the water amount pattern taken out from the water source,
First, the water amount pattern actually taken out from the water source for a certain period is measured, and then the water amount ratio taken out of each node is obtained from the sum of the metering water amount data of the faucet connected to each node for a certain period. After that, the water flow pattern taken out from each node is approximated by proportional distribution of the measured water flow pattern of the water source. Hydraulic analysis is performed on the extracted water amount at an arbitrary time specified by the approximated extracted water amount model to calculate and derive hydraulic data such as each node head and each pipe flow velocity. Hydraulic data such as each node head and each pipeline flow velocity at a specific time of the distribution network to be analyzed is converted based on the used water ratio at the specific time obtained by the approximated taken water amount model.

As shown in FIG. 4, when the pipeline from the water source to the point P branches halfway into two pipelines S1 and S2, the analysis at a certain time shows that the flow rate at the point P is Q0. in, the flow rate in line S1 is Q1, the flow rate was Q2 in line S2, head losses H1 = r in line S1 '(Q1) head losses in the ^u pipe S2 H2 = r''(Q2 ) It can be expressed as ^u . Here, r ′, r ″, and u are constants. Since the head loss of both pipelines should be equal, H
1 = H2, from which r ′ (Q1) ^u
= R ″ (Q2) ^u , and therefore (Q2 / Q1) ^u = r ″ / r ′ (constant). It is thought that it will be. In other words, the flow rate at another time can be obtained by allocating the flow rate at a certain time obtained by the hydraulic analysis based on the flow rate obtained by the approximated water flow rate model without performing the hydraulic analysis. .

[0007]

Thus, according to the present invention, it is possible to provide a hydraulic analysis method for a water distribution network which can very easily and rapidly derive hydraulic data at predetermined time intervals even in a complicated water distribution network. Became.

[0008]

Embodiments of the present invention will be described below. A pipe network analysis device for performing hydraulic analysis of a distribution pipe network is configured by a computer 1 such as a personal computer or a workstation, and its functional blocks are, as shown in FIG. 1, from a water source of a distribution pipe network to be analyzed. 24 hours of water distribution pattern (take-out water volume pattern) and water tap data of the faucet connected to each node
An input model generation unit 2 for generating a water withdrawal pattern for time, a water withdrawal amount at an arbitrary time T of the water withdrawal pattern generated by the input model generation unit 2, an extension of the water distribution pipe stored in the storage device M, and a pipe diameter And hydraulic data at time T obtained by hydraulic analysis using the extracted water volume pattern generated by the input model generating unit 2. A hydraulic data generation unit 4 which converts the extracted water amount ratio at the specified time T ′ to obtain hydraulic data at the specified time T ′.

The pipe network data includes drawing data representing arrangement information of water distribution pipes, valve plugs, water sources, etc., constituting water supply facilities, and management data of those water supply facilities, that is, pipe types, pipe diameters, It consists of data representing pipeline length, laying position, construction date, etc., and attribute data consisting of connection information between distribution pipes in the drawing data.

As shown in FIG. 2A, the input model generation unit 2 derives a time-average water usage from the monthly water usage of each of the measured homes, and calculates an arbitrary water-source daily average water-distribution amount. The time coefficient which is the ratio of the amount of water distribution at the time is derived, and the water amount model is determined by taking out the time average used water amount of each house and the time coefficient. That is, water distribution amount = Σ taken water amount taken water amount = time coefficient x correction coefficient x meter reading water amount + corrected water amount. Here, the correction coefficient takes into consideration the amount of invalid non-revenue water such as water leakage, and is appropriately set to a value of 1.0 or more. Furthermore, in order to consider the use of fire hydrants and the amount of effective non-revenue water used for washing pipes and the like required in emergency situations and maintenance work, the estimated corrected water amount is added as appropriate. That is, the input model generation unit 2 can generate a taken-out water amount model as appropriate according to the purpose. For example, every month from January to December, one week from Sunday to Saturday every day, and one day from 0:00 to 23
The table may be created by dividing the data every hour until the hour, and obtaining the time coefficient and the correction coefficient corresponding to each time from the collected data of the previous year.

The hydraulic analysis unit 3 calculates the loss head at each node of the pipe network based on the continuous flow rate condition by using the contact head method with respect to the water amount taken out at any time of the water amount model taken out from each node described above. By solving, the flow rate of each pipeline is calculated and derived. The head loss H is obtained by the following equation. H = r'Q ^u where r '= 10.666 ^{CH -1.85} D ^-4.87 L, u
= 1.85 (CH is flow coefficient, L is distance, Q is flow rate, D
Is the caliber).

As shown in FIG. 2 (b), the hydraulic data generator 4 calculates the remaining 23 pipe flow rates using the extracted water flow model without calculating the pipe network for each variation pattern of the extracted water flow model. The conversion is performed based on the ratio of the amount of water taken out at the specified time. Further, in the pipe network shown in FIG. 3A, each node is traced from a water source through a tree as shown in FIG. For example, the hydraulic level at the intersection A in the figure is obtained by the height of the water source-(the sum of the losses of the pipes 1 to 5), and the effective head is obtained by the hydraulic level-the ground height.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a hydraulic analysis method for a water distribution network.

FIG. 2 is an explanatory diagram of a taken-out water amount model and a pipe flow rate.

FIG. 3 is an explanatory diagram for deriving a head at a node;

FIG. 4 is an explanatory view of a main part.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03B 1/00

Claims (1)

(57) [Claims] 1. A water flow model extracted from each node of a distribution pipe network to be analyzed is generated, and hydraulic data such as a head of each node and a flow rate of each pipeline of the distribution pipe network are generated with respect to the extracted water volume model. Is a hydraulic analysis method for a water distribution network that uses a computer to calculate and calculate the water flow pattern, which is obtained by proportionally distributing the water flow pattern actually taken out from the water source to the actual water taken out from each node obtained from the metering water flow data. Is approximated as the extracted water amount model, hydraulic analysis is performed on the extracted water amount at an arbitrary time specified by the approximated extracted water amount model, and the hydraulic data obtained by the hydraulic analysis is approximated. Hydraulic analysis of the water distribution network based on the extracted water volume ratio at the specific time specified by the extracted water volume model Method.