Emergency regulation and control method for open channel water conveyance project capable of dynamically increasing regulation and storage areas

Abstract

The invention discloses an open channel water conveyance project emergency regulation and control method capable of dynamically increasing regulation and storage areas. The method comprises the steps that S1, a plurality of adjacent channel pools close to the upstream of an accident channel section are determined to serve as the current regulation and storage areas; s2, according to the flow plan of the water diversion port of the channel, estimating an emergency scheduling water surface line of the regulation and storage area channel pool, and according to the current water surface line of the channel pool and the emergency scheduling water surface line, determining the regulation and storage volume of the regulation and storage area; s3, calculating buffer time which can be provided by the regulation and storage area according to the regulation and storage volume and the flow of the outflow gate reduced after emergency scheduling; s4, the flow of the upstream non-regulation and storage area of the accident channel section is kept unchanged, the inlet and outlet flow difference of the regulation and storage area channel pool is kept, and water surface line lifting is completed within the buffer time; s5, judging whether the buffer time meets the upstream continuous normal water delivery requirement and / or the emergency disposal requirement, and if yes, ending emergency regulation; and otherwise, determining a plurality of adjacent channels as newly-added regulation and storage areas at the upstream close to the current regulation and storage area, updating the current regulation and storage area by adopting the newly-added regulation and storage areas, and returning to S2.

Description

Technical Field

[0001] The invention relates to channel and pool dispatching technology, and in particular to an emergency control method for an open channel water delivery project with a dynamically increased storage area. Background Art

[0002] Long-distance water transfer projects are generally divided into series of channels and pools by control gates. Water diversion ports are set in the channels and pools to divert water to the receiving areas along the route. They span multiple regions and are usually managed by administrative units for the convenience of organization and coordination. For example, the middle line project has branches in Beijing, Henan, and Hebei. Among them, the Nanyang section of the Henan branch has Taocha, Dengzhou, Zhenping and other management offices, each of which has jurisdiction over several channels and pools.

[0003] For long-distance open channel water transfer projects, water pollution, structural collapse, equipment failure and other emergencies are inevitable. In serious cases, the water flow rate is greatly reduced or even completely interrupted. In response, emergency regulation needs to be implemented upstream of the accident channel section, switching from the previous high-flow water transfer to low-flow water transfer. In the process, it is necessary to avoid overflow and lining damage caused by sudden rise and fall of water levels.

[0004] When conducting emergency dispatch, the existing methods generally use all channels and ponds upstream of the accident channel section as regulation and storage areas, or randomly select a certain number of channels and ponds as regulation and storage areas, and simultaneously reduce the inflow into the channel head to meet the water diversion needs upstream of the accident channel section; when using this method for dispatching, the channels and ponds of the entire channel upstream of the accident channel section need to participate in the emergency dispatch, and normal operation will be affected, with a wide range of impact. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the emergency control method for open channel water transfer projects with dynamically increased storage areas provided by the present invention solves the problem that the prior art uses the entire upstream of the accident channel section as the storage area and participates in the emergency dispatch throughout the whole process, resulting in a large impact range of the emergency dispatch.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] Provided is an emergency control method for an open channel water transfer project for dynamically increasing a storage area, comprising the steps of:

[0008] S1. According to the need for continued normal water delivery and / or emergency response upstream of the accident channel section, multiple adjacent channel pools immediately upstream of the accident channel section are determined as the current regulation and storage area;

[0009] S2. According to the flow plan of the channel diversion outlet, the emergency dispatching water surface line of the channel pool in the regulation and storage area is estimated by using the channel one-dimensional gradual flow simulation model. According to the current water surface line of the channel pool and the emergency dispatching water surface line, the storage volume provided by the regulation and storage area is determined;

[0010] S3. Calculate the buffer time that the storage area can provide based on the storage volume and the reduced outflow gate flow of the most downstream channel pool after emergency dispatch;

[0011] S4. The non-storage area upstream of the accident channel section maintains a flow balance relationship, the channel pool in the storage area maintains the difference in inflow and outflow, and the water surface line is raised within the buffer time;

[0012] S5, judging whether the buffer time meets the upstream normal water supply demand and / or emergency disposal demand, if so, ending the emergency control method; otherwise, proceeding to step S6;

[0013] S6. Determine a plurality of adjacent channels and pools as newly added storage areas immediately upstream of the current storage area, and use the newly added storage areas to update the current storage area, and then return to step S2.

[0014] Furthermore, step S2 further comprises:

[0015] S21. Use HEC-RAS software or Matlab programming language to construct a one-dimensional gradual flow simulation model of the channel;

[0016] S22. Determine the water volume function of channel pool i after emergency dispatch:

[0017] V(i)=f(Q offtake (i), Q out (i), Z up (i));

[0018] Where V(i) is the water volume of channel pond i; Q offtake (i) is the flow rate of the water diversion outlet; Z up (i) is the water level before the outflow gate of channel i; Q out (i) is the outflow gate discharge of channel i;

[0019] S23. According to the water volume function, a one-dimensional gradually changing flow simulation model is used to determine the water surface line of each channel pool in the storage area after emergency dispatch;

[0020] S24, according to the water surface line after emergency dispatch and the current water surface line of each channel pool in the regulation and storage area, respectively accumulate the prismatic water bodies below the water surface line to obtain the water volume after emergency dispatch and the current water volume;

[0021] S25. According to the water volume after emergency dispatch of all channels and pools in the regulation and storage area and the current water volume, the regulation and storage volume provided by the regulation and storage area is obtained:

[0022]

[0023] Among them, V0(i) and V1(i) are the current water volume and water volume after emergency dispatch of channel pool i respectively; N is the total number of channels and pools contained in the upstream channel of the accident channel section; n1 is the total number of channels and pools included in the current storage area; DV1 is the storage volume provided by the storage area; channel pool N is the channel pool adjacent to the accident channel section.

[0024] Furthermore, the expression for calculating the buffer time is:

[0025] DT1=DV1 / △Q out (N)

[0026] Among them, DT1 is the buffer time; DV1 is the storage volume provided by the storage area; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch.

[0027] Furthermore, the outflow gate flow of the non-storage channel upstream of the accident channel section is:

[0028] Q in (i) = Q offtake (i)+Q out (i);

[0029] Among them, Q in (i) is the inflow gate flow rate of channel i; Q offtake (i) is the flow rate of the water diversion port; Q out (i) is the outflow gate discharge of channel i;

[0030] The expression for maintaining the difference in inflow and outflow of the channel pool in the storage area is:

[0031] △Q1(i)=△Q out (N)×V1(i) / DV1

[0032] Among them, △Q1(i) is the difference in inflow and outflow maintained by channel pool i; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch;

[0033] After emergency dispatch, the flow relationship between the inflow and outflow of the channel pool in the storage area is:

[0034] Q in调 (i) = Q offtake (i)+Q out (i)+△Q1(i);

[0035] Among them, Q in调 (i) is the inflow gate flow of channel pool i after emergency dispatch.

[0036] Furthermore, the multiple channels and pools in the regulation and storage area determined each time belong to the same administrative unit.

[0037] The beneficial effects of the present invention are as follows: when a channel section failure occurs, the present solution utilizes the space below the safe overheight of the long-distance water delivery open channel as the water storage space during emergency dispatch of sudden accidents, thereby buffering the impact of downstream emergency dispatch on the operation of upstream channels. During emergency dispatch, the number of channel pools in the storage area can be dynamically increased according to the processing time required for the continuation of normal water delivery demand and / or emergency disposal demand upstream of the accident channel section, thereby adapting to the uncertainty of the regulation process.

[0038] Compared with the traditional method of using the entire upstream of the accident channel section as the storage area and participating in the emergency dispatch throughout the process, this scheme can meet the needs of upstream to continue normal water delivery and the time required for handling (emergency repair) of the accident channel section, reduce the scope and degree of impact of emergency dispatch, and save operation and management costs. The storage area is divided into administrative units, which is easier to coordinate and cooperate in management than the traditional arbitrary division method, and reduces the difficulty and cost of administrative management. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Flow chart of the emergency control method for open channel water transfer projects with dynamically increased storage areas.

[0040] Figure 2 Schematic diagram of the flow rate through the gate in the embodiment.

[0041] Figure 3 Schematic diagram of the flow process of each channel and pool water diversion outlet in the embodiment.

[0042] Figure 4 Schematic diagram of the water volume process of each channel and pond in the embodiment.

[0043] Figure 5 It is a schematic diagram of the change of the water surface line of the channel pool before and after the emergency dispatch in the embodiment (the dotted line is after the emergency dispatch). DETAILED DESCRIPTION

[0044] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0045] refer to Figure 1 , Figure 1 The flowchart of the emergency control method of the open channel water transfer project with dynamically increasing the storage area is shown as follows: Figure 1 As shown, the method S includes steps S1 to S6.

[0046] In step S1, according to the need for continued normal water delivery and / or emergency disposal upstream of the accident channel section, multiple adjacent channels and pools immediately upstream of the accident channel section are determined as the current storage area. Assume that the time of the accident is t0, and the channel upstream of the accident channel section contains N channels and pools. Starting from the adjacent channel pool upstream of the accident channel section, n1 channels and pools are continuously demarcated as storage areas in the upstream direction, and the channels and pools are numbered N-n1+1~N, and the channel pool adjacent to the accident channel section is numbered N.

[0047] This scheme preferably determines that multiple channels and pools in the storage area each time belong to the same administrative unit; the storage area in this scheme is divided into administrative units, which is easier to coordinate and cooperate in management than the traditional arbitrary division method, and reduces the difficulty and cost of administrative management.

[0048] In step S2, according to the flow plan of the channel diversion outlet, the emergency dispatching water surface line of the channel pool in the regulation and storage area is estimated by using the channel one-dimensional gradual flow simulation model, and the regulation and storage volume provided by the regulation and storage area is determined according to the current water surface line of the channel pool and the emergency dispatching water surface line.

[0049] In one embodiment of the present invention, step S2 further comprises:

[0050] S21. Use HEC-RAS software or Matlab programming language to construct a one-dimensional gradual flow simulation model of the channel;

[0051] S22. Determine the water volume function of channel pool i after emergency dispatch:

[0052] V(i)=f(Q offtake (i), Q out (i), Z up (i));

[0053] Where V(i) is the water volume of channel pond i; Z up (i) is the water level before the outflow gate of channel i; Q out (i) is the outflow gate discharge of channel i;

[0054] S23. According to the water volume function, a one-dimensional gradually changing flow simulation model is used to determine the water surface line of each channel pool in the storage area after emergency dispatch;

[0055] S24, according to the water surface line after emergency dispatch and the current water surface line of each channel pool in the regulation and storage area, respectively accumulate the prismatic water bodies below the water surface line to obtain the water volume after emergency dispatch and the current water volume;

[0056] S25. According to the water volume after emergency dispatch of all channels and pools in the regulation and storage area and the current water volume, the regulation and storage volume provided by the regulation and storage area is obtained:

[0057]

[0058] Among them, V0(i) and V1(i) are the current water volume and water volume after emergency dispatch of channel pool i respectively; N is the total number of channels and pools contained in the upstream channel of the accident channel section; n1 is the total number of channels and pools included in the current storage area; DV1 is the storage volume provided by the storage area; channel pool N is the channel pool adjacent to the accident channel section.

[0059] In step S3, the buffer time that can be provided by the regulation and storage area is calculated based on the regulation and storage volume and the reduced outflow gate flow of the most downstream channel pool after emergency dispatch:

[0060] DT1=DV1 / △Q out (N)

[0061] Among them, DT1 is the buffer time; DV1 is the storage volume provided by the storage area; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch.

[0062] In step S4, the non-storage area upstream of the accident channel section maintains the flow balance relationship unchanged, and the channel pool in the storage area maintains the inlet and outlet flow difference, and the water surface line is raised within the buffer time.

[0063] In step S4, the outflow gate flow of the non-storage channel upstream of the accident channel section is:

[0064] Q in (i) = Q offtake (i)+Q out (i);

[0065] Among them, Q in (i) is the inflow gate flow rate of channel i; Q offtake (i) is the flow rate of the water diversion port; Q out (i) is the outflow gate discharge of channel i;

[0066] The expression for maintaining the difference in inflow and outflow of the channel pool in the storage area is:

[0067] △Q1(i)=△Q out (N)×V1(i) / DV1

[0068] Where △Q1(i) is the difference in inflow and outflow maintained by channel pool i; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch;

[0069] After emergency dispatch, the flow relationship between the inflow and outflow of the channel pool in the storage area is:

[0070] Q in调 (i) = Q offtake (i)+Q out (i)+△Q1(i);

[0071] Among them, Q in调 (i) is the inflow gate flow of channel pool i after emergency dispatch.

[0072] In step S5, it is determined whether the buffer time meets the upstream normal water supply demand and / or emergency disposal demand. If so, the emergency control method is terminated; otherwise, the process proceeds to step S6;

[0073] To facilitate understanding of the need to continue normal water delivery upstream, an example is given: assuming that an accident occurs during drought relief water delivery, the upstream channels and ponds are implementing large-flow and high-water-level water delivery. The operation and scheduling requirements at this time are to utilize the channel storage capacity to strive for a longer normal water delivery time for the upstream channels and ponds. If a drought develops during the scheduling process and lasts longer than expected, the number of storage areas will be increased accordingly.

[0074] The emergency response requirement is the time required to repair and remove obstacles in the accident channel section. For example, it takes at least 30 hours to repair the accident channel section. Therefore, when using the space below the safety height of the long-distance water transfer open channel as the water storage space for emergency dispatch of sudden accidents, the buffer time needs to be guaranteed to be more than 30 hours.

[0075] When scheduling is applied, and it is hoped that the scheduling can simultaneously meet the upstream normal water supply demand and emergency disposal demand, if there are sufficient storage areas available, the storage areas should be set up according to the larger buffer time of the two demands; if the storage areas are insufficient, the storage areas should be set up according to the buffer time corresponding to the higher priority demand of the two demands.

[0076] In step S6, a plurality of adjacent channels and pools are determined as newly added storage areas immediately upstream of the current storage area, and the current storage area is updated with the newly added storage areas, and then the process returns to step S2.

[0077] In order to facilitate the understanding of the operation of the emergency control method of this plan, the implementation process of this plan is described in detail below with reference to specific cases:

[0078] This embodiment mainly considers the emergency regulation under the condition of meeting the normal water supply demand of the upstream, with Taocha Regulating Gate G0 at the head of the middle line project ~ Beiru River Regulating Gate G 15 This section of the water transfer project is 280 km long and includes 14 channels and ponds (N=14). Before the accident, the water receiving areas of the four upstream channels and ponds experienced severe drought. The channels performed a large flow and high water level water transfer task, with a water transfer flow of about 70% of the design flow, which was required to last until about the 30th hour. The flow through each control gate is as follows: Figure 2 At the 0 time point, the water level of each channel pool is as follows Figure 4 At 12h, an accident occurred in the channel pool downstream of the Beiru River Regulating Gate, and emergency dispatching began in 14 channels and pools upstream of the accident channel section.

[0079] Step S1, initially set the scope of the regulation and storage area: when an accident occurs, according to the judgment of the development trend of drought in the water receiving areas of the four upstream canals and ponds and the corresponding continuation of normal water delivery needs, refer to the administrative management unit, and set the Lihe River Regulating Gate G in Pingdingshan City. 11 ~Beiru River Regulating Gate G 15 The four channels and ponds (n1=4) in between are the regulation and storage areas, involving the three management offices of Ye County, Lushan and Baofeng, and the corresponding channel and pond numbers are 11 to 14.

[0080] Step S2, estimate the storage volume that can be provided by the storage area. Use Matlab language programming to build a one-dimensional non-constant gradual flow simulation model of the channel, according to the channel water outlet flow plan (for details, please refer to Figure 3 ), calculate the water surface lines of each channel and pool in the storage area after emergency dispatch (such as Figure 4 The dotted water surface lines corresponding to the middle channel pools 11 to 14) and the corresponding water volume V1 (channel pools 11 to 14 are 6.22551 million m 3 、278.851 million m 3 、531.606 million m 3 and 3,066,680 m 3 ), combined with the current water surface lines of each channel and pond in the regulation and storage area (such as Figure 4 The solid water surface lines corresponding to the middle channel pools 11 to 14) and the corresponding water volume V0 (channel pools 11 to 14 are 5.33215 million m 3 、236.999 million m 3 469.899 million m 3 and 2,684,960 m 3 ), it is estimated that the storage volume that can be provided by the channel pools 11 to 14 in the storage area is

[0081] Step S3, estimating the buffer time that can be provided by the regulation and storage area:

[0082] DT1=DV1 / △Q out (N) = 231.067 × 10 4 / 35=6.602×10 4 s, about 18.3h.

[0083] Step S4: the non-storage area upstream of the accident channel section maintains the flow balance relationship unchanged, the channel pool in the storage area maintains the inflow and outflow flow difference, and the water surface line is raised within the buffer time, such as Figure 5 .

[0084] It is assumed that each channel and pool in the regulation and storage area adopts the same water surface rising time, and channel and pool i maintains the difference in inflow and outflow:

[0085] △Q1(i)=△Q out(N)×V1(i) / DV1, the △Q1 corresponding to channels 11 to 14 is 13.532m 3 / s、6.339m 3 / s、9.347m 3 / s and 5.782m 3 / s.

[0086] The flow relationship between the inflow and outflow of the channel pool in the storage area is: Q in调 (i) = Q offtake (i)+Q out (i)+△Q1(i).

[0087] Step S5, based on the current judgment on the development trend of drought in the water receiving areas of the four upstream channels and pools, the buffer time provided by the existing regulation and storage area cannot meet the upstream demand for continued normal water delivery, and the process proceeds to step S6.

[0088] Step S6, referring to the administrative unit, adding a new regulation and storage area adjacent to the existing regulation and storage area upstream.

[0089] The new storage area is the Huangjin River Regulating Sluice G9 to the Lihe River Regulating Sluice G under the jurisdiction of Nanyang Fangcheng Management Office. 11 There are two channels between them (n2=2), and the channels are numbered 9-10.

[0090] Step S7, estimate the storage volume that the newly added storage area can provide. Based on the one-dimensional non-steady gradual flow simulation model of the channel, according to the channel diversion outlet flow plan ( Figure 3 ), estimate the water surface of each channel and pond after emergency dispatch in the regulation and storage area ( Figure 4 The dotted water surface lines corresponding to the middle channel pools 9 to 10) and the corresponding water volume V2 (channel pools 9 to 10 are 5.93163 million m 3 and 7408720m 3 ), combined with the current water surface lines of each channel and pond in the regulation and storage area ( Figure 4 The solid water surface lines corresponding to the middle channel pools 9 to 10) and the corresponding water volume V1 (channel pools 9 to 10 are 5.0969 million m 3 and 636.319 million m 3 ), it is estimated that the storage volume that can be provided by channel pools 9 to 10 in the storage area is

[0091]

[0092] Step S8, estimating the buffer time that can be provided by the regulation and storage area:

[0093] DT2=DV2 / △Q out (N) = 188.025 × 10 4 / 35=5.372×10 4 s, about 15.0h.

[0094] Step S9: the non-storage area upstream of the accident channel section maintains the flow balance relationship unchanged, the channel pool in the storage area maintains the inflow and outflow flow difference, and the water surface line is raised within the buffer time. Figure 5 .

[0095] It is assumed that each channel and pool in the regulation and storage area adopts the same water surface rising time, and channel and pool i maintains the difference in inflow and outflow:

[0096] △Q2(i)=△Q out (N)×V2(i) / DV2, the △Q2 corresponding to channels 9 to 10 are 15.538m 3 / s and 19.462m 3 / s.

[0097] The flow relationship between the inflow and outflow of the channel pool in the storage area is: Q in调 (i) = Q offtake (i)+Q out (i)+△Q2(i).

[0098] Step S10, based on the current judgment on the development trend of drought in the water receiving areas of the four upstream channels and pools, the buffer time provided by the existing regulation and storage area cannot meet the upstream demand for continued normal water delivery, and the process proceeds to step S11.

[0099] Step S11, referring to the administrative unit, a new regulation and storage area is added upstream of the existing regulation and storage area, adjacent to the existing regulation and storage area.

[0100] The newly added regulating and storage area is the two channel pools (n3=2) between Baihe Regulating Gate G7 and Huangjinhe Regulating Gate G9 under the jurisdiction of Nanyang City Urban Management Office, and the channel pools are numbered 7-8.

[0101] Step S12, estimate the storage volume that can be provided by the newly added storage area. Based on the one-dimensional non-steady gradual flow simulation model of the channel, according to the flow plan of the channel diversion outlet ( Figure 3 ), estimate the water surface of each channel and pond after emergency dispatch in the regulation and storage area ( Figure 4 The dotted water surface lines corresponding to the middle channel pools 7 to 8) and the corresponding water volume V3 (channel pools 7 to 8 are 5,531,630 m 3 and 6,072,850 m 3 ), combined with the current water surface lines of each channel and pond in the regulation and storage area ( Figure 4 The solid water surface lines corresponding to the middle channel pools 7 to 8) and the corresponding water volume V0 (channel pools 7 to 8 are 4.80022 million m 3 and 5,240,910 m 3 ), it is estimated that the storage volume that can be provided by the channel pools 7 to 8 in the storage area is

[0102]

[0103] Step S13, estimating the buffer time that can be provided by the regulation and storage area:

[0104] DT3=DV3 / △Q out (N) = 156.336 × 10 4 / 35=4.467×10 4 s, about 12.4h.

[0105] Step S14: The non-storage area upstream of the accident channel section maintains the flow balance relationship unchanged, and the channel pool in the storage area maintains the difference in inflow and outflow, and the water surface line is raised within the buffer time. The water surface line change diagram can be referred to Figure 5 ,exist Figure 5 The bottom solid line is the channel bottom elevation line, the solid line above the channel bottom elevation line is the channel pool water surface line before emergency dispatch, and the top dotted line is the channel pool water surface line after emergency dispatch.

[0106] It is assumed that each channel and pool in the regulation and storage area adopts the same water surface rising time, and channel and pool i maintains the difference in inflow and outflow:

[0107] △Q3(i)=△Q out (N)×V3(i) / DV3, the △Q1 corresponding to channel pools 7 to 8 are 16.375m 3 / s and 18.625m 3 / s.

[0108] The flow relationship between the inflow and outflow of the channel pool in the storage area is: Q in调 (i) = Q offtake (i)+Q out (i)+△Q3(i).

[0109] Step S15, determine that the drought in the upstream water receiving area has been alleviated, and the buffer time provided by the current existing storage area can meet the upstream normal water supply demand, and end the currently executed emergency control method. Figure 2 The water volume process of each channel pool is as follows Figure 4 .

[0110] From 12h to 30.3h after the accident (lasting 18.3h), only the four channels and pools at the end of Pingdingshan City (numbered Pool 11 to Pool 14) were involved in regulation. The inflow flow of these channels and pools was greater than the outflow flow, and the water volume increased. However, the gate flow and water volume of the first four channels and pools upstream remained unchanged, and normal operation was not disturbed.

[0111] From 30.3h to 45.3h (lasting 15h), two additional canal pools (numbered Pool 9 to Pool 10) in Fangcheng County, Nanyang City, participated in the regulation, and the normal operation of the first four canal pools upstream was not disturbed.

[0112] From 45.3h to 57.7h (lasting 12.4h), two new canal pools (numbered Pool 7 to Pool 8) in the urban area of ​​Nanyang City participated in the regulation, and the normal operation of the first four canal pools upstream was not disturbed.

[0113] It can be seen from this embodiment that this scheme determines whether the current buffer time is appropriate by alleviating the drought in the upstream, and dynamically adjusts the channels and ponds involved in storage, thereby ensuring the normal operation of the channels and ponds upstream that supply water to the drought-affected areas.

[0114] In summary, the emergency dispatch method of this scheme dynamically increases the participation of channel ponds in the adjacent accident channel section in regulation and storage, thereby meeting the needs of handling the accident channel section and continuing normal water supply in the upstream channel ponds. In addition, during regulation and storage, it is not necessary for all channel ponds to participate, that is, it is not necessary for management offices of multiple administrative regions to participate in regulation and storage, thereby reducing the scope and degree of the impact of emergency dispatch and saving operation and management costs.

Claims

1. An emergency control method for an open channel water transfer project with a dynamically increased storage area, characterized in that: Includes steps: S1. According to the need for continued normal water delivery and / or emergency response upstream of the accident channel section, multiple adjacent channel pools immediately upstream of the accident channel section are determined as the current regulation and storage area; S2. According to the flow plan of the channel diversion outlet, the emergency dispatching water surface line of the channel pool in the regulation and storage area is estimated by using the channel one-dimensional gradual flow simulation model. According to the current water surface line of the channel pool and the emergency dispatching water surface line, the storage volume provided by the regulation and storage area is determined; S3. Calculate the buffer time that the storage area can provide based on the storage volume and the reduced outflow gate flow of the most downstream channel pool after emergency dispatch; S4. The non-storage area upstream of the accident channel section maintains a flow balance relationship, the channel pool in the storage area maintains the difference in inflow and outflow, and the water surface line is raised within the buffer time; S5, judging whether the buffer time meets the upstream normal water supply demand and / or emergency disposal demand, if so, ending the emergency control method; otherwise, proceeding to step S6; S6. Determine a plurality of adjacent channels and pools as newly added storage areas immediately upstream of the current storage area, and use the newly added storage areas to update the current storage area, and then return to step S2.

2. The method for emergency control of open channel water transfer engineering for dynamically increasing the storage area according to claim 1 is characterized in that: Step S2 further comprises: S21. Use HEC-RAS software or Matlab programming language to construct a one-dimensional gradual flow simulation model of the channel; S22. Determine the water volume function of channel pool i after emergency dispatch: V(i)=f(Q offtake (i),Q out (i),Z up (i)); Where V(i) is the water volume of channel pond i; Q offtake (i) is the flow rate of the water diversion port; Z up (i) is the water level before the outflow gate of channel i; Q out (i) is the outflow gate discharge of channel i; S23. According to the water volume function, a one-dimensional gradually changing flow simulation model is used to determine the water surface line of each channel pool in the storage area after emergency dispatch; S24, according to the water surface line after emergency dispatch and the current water surface line of each channel pool in the regulation and storage area, respectively accumulate the prismatic water bodies below the water surface line to obtain the water volume after emergency dispatch and the current water volume; S25. According to the water volume after emergency dispatch of all channels and pools in the regulation and storage area and the current water volume, the regulation and storage volume provided by the regulation and storage area is obtained: Among them, V0(i) and V1(i) are the current water volume and water volume after emergency dispatch of channel pool i respectively; N is the total number of channels and pools contained in the upstream channel of the accident channel section; n1 is the total number of channels and pools included in the current storage area; DV1 is the storage volume provided by the storage area; channel pool N is the channel pool adjacent to the accident channel section.

3. The method for emergency control of open channel water transfer engineering for dynamically increasing the storage area according to claim 1 is characterized in that: The expression for calculating the buffer time is: DT1=DV1 / △Q out (N) Among them, DT1 is the buffer time; DV1 is the storage volume provided by the storage area; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch.

4. The method for emergency control of open channel water transfer engineering for dynamically increasing the storage area according to claim 2 is characterized in that: The outflow gate flow of the non-storage channel upstream of the accident channel section is: Q in (i)=Q offtake (i)+Q out (i); Among them, Q in (i) is the inflow gate flow rate of channel i; Q offtake (i) is the flow rate of the water diversion port; Q out (i) is the outflow gate discharge of channel i; The expression for maintaining the difference in inflow and outflow of the channel pool in the storage area is: △Q1(i)=△Q out (N)×V1(i) / DV1 Where △Q1(i) is the difference in inflow and outflow maintained by channel pool i; △Q out (N) is the reduced outflow gate flow of the most downstream channel after emergency dispatch; After emergency dispatch, the flow relationship between the inflow and outflow of the channel pool in the storage area is: Q in调 (i)=Q offtake (i)+Q out (i)+△Q1(i); Among them, Q in调 (i) is the inflow gate flow of channel pool i after emergency dispatch.

5. The method for emergency control of open channel water transfer engineering for dynamically increasing the storage area according to claim 1, characterized in that: The multiple channels and ponds in the storage area determined each time belong to the same administrative unit.

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