A flood control water level classification method for reservoir groups based on differences in design flood volumes

Abstract

The present invention provides a method for grading flood control water levels of a reservoir group based on differences in designed flood volumes, establishes characteristic parameters and a state variable set of a reservoir group, selects control sections and flood control indicators of downstream protection objects, establishes a series of reservoirs for overall designed floods of different frequencies, deduces the spatiotemporal distribution of the flood storage volume to be stored in the reservoir group based on the discharge capacity, calculates the minimum flood control storage capacity scheme for the reservoir group, and designs graded water levels for flood control of the reservoir group based on differences in designed flood volumes. While making full use of the flood resource regulation and storage capacity of the reservoir group, a red line for flood control safety control in the river basin corresponding to flood magnitudes of different frequencies and regional compositions is provided for the reservoir group.

Description

Technical Field

[0001] The invention relates to the field of flood control and dispatching in river basins, and in particular to a flood control water level classification method for a reservoir group based on differences in designed flood volumes. Background Art

[0002] Improving the flood prevention capacity of the river basin is an important part of the water security of the river basin. With the rapid development of water conservancy and hydropower engineering construction in my country, my country's major rivers have formed upstream and downstream, main and tributary rivers, series and parallel, and the world's largest cascade reservoir group. Taking the Yangtze River Basin as an example, more than 50,000 reservoirs have been built and put into operation, including more than 300 large reservoirs, with a total regulation capacity of 150 billion m³ and a flood control capacity of more than 80 billion m³. Its current operating conditions are significantly different from the design conditions, and the rainfall, water and engineering conditions have changed significantly. The practical requirements for joint optimization and regulation of reservoir groups and efficient use of water resources are very urgent.

[0003] Problems with existing technologies:

[0004] When considering flood conditions during the flood season, existing technologies still mainly focus on the flood control standards of a single reservoir or a certain protection object, but rarely explore the analysis and calculation methods of the flood season operation mode of the control reservoir group under different conditions such as different flood magnitudes and regional compositions on a large temporal and spatial scale of the entire basin. It is difficult to adapt to the new needs of scientifically grasping the changes in the water situation of the entire basin, preventing and controlling droughts and floods in the basin, and unified joint scheduling of water projects;

[0005] When considering reservoir flood control scheduling, existing technologies mostly operate strictly according to the original design characteristic water level, or implement forecast and pre-discharge dynamic floating control. There is no systematic flood control safety control threshold conditions for reservoir groups based on different flood conditions. There is still a certain gap between the requirements for safe and efficient use of flood resources in the new era.

[0006] While studying and implementing the joint optimization and regulation of the operating water level of cascade reservoirs during the flood season and exploring the dynamic control methods of the operating water level of cascade reservoirs during the flood season, it is also necessary to determine the flood control safety control threshold conditions of the flood control reservoir group under different flood conditions without lowering the flood control standards. Therefore, it is urgent to consider the differences in flood magnitude and regional composition of different frequencies, and to develop a hierarchical design method for flood control water levels of reservoir groups based on differences in design flood volumes. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a flood control water level classification method for a reservoir group based on differences in designed flood volumes.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The present invention provides a flood control water level classification method for a reservoir group based on design flood volume differences, comprising the following steps:

[0010] S1. Establish reservoir group characteristic parameters and state variable sets ;

[0011] According to the design results of the control reservoir group, the normal water storage level of each reservoir is extracted , Dead water level , flood limit water level , flood control high water level , water level and storage capacity curve , discharge capacity curve , flood control storage capacity , corresponding storage capacity for flood control high water level , establish the characteristic parameter set of the reservoir group At the same time, the water level 、Storage capacity , Inbound traffic , discharge capacity , outbound traffic , flood discharge control threshold , the total flood storage capacity of the reservoir group , establish the state variable set of the reservoir group , combined to form the reservoir group characteristic parameters and state variable set ;

[0012] ;

[0013] in, For the Reservoirs; The number of reservoirs in a cascade reservoir group; and All are curve functions;

[0014] S2. Select the downstream protection object control section and flood control indicators ;

[0015] S3. Establish a series library of overall design floods of different frequencies in the basin ;

[0016] S4. Determine the spatiotemporal distribution of flood storage capacity of a reservoir group based on discharge capacity;

[0017] S5. Method for calculating the minimum flood control storage capacity of a reservoir group considering different frequency design flood volumes;

[0018] S6. Flood control and graded water levels of reservoir groups based on differences in design flood volumes.

[0019] Further, the S2 is specifically:

[0020] According to the flood control task of the control reservoir group, the downstream protection objects are analyzed and selected to control the cross section according to the topological structure of the natural water system, the layout of water projects and the flood control planning requirements of the basin in the study area. The flood control discharge flow rate is used as the maximum flood discharge control index. :

[0021] ;

[0022] For the The maximum flood discharge control index of each control section; The number of sections controlled for downstream protection objects;

[0023] The flood control and discharge flow can be determined based on the corresponding peak flow results of the approved flood control standards of the protection objects. If there are no corresponding peak flow results, it can be obtained based on the flood control guarantee water level combined with the cross-section water level-flow relationship.

[0024] Further, the S3 is specifically:

[0025] The most downstream control section is used as the overall design flood control section , based on the mean and coefficient of variation of long series flood peaks, flood volumes, and flood volumes at the dam site sections and control sections of the control reservoir group , skewness coefficient and different frequency design values ​​to form a design results set ; Take the corresponding design flood processes of different frequencies in typical years as the typical process set , comprehensive design flood series library with different frequencies :

[0026] ;

[0027] ;

[0028] in, Design a collection of results for the flood peak; It is the multi-year average of long-sequence flood peaks; is the coefficient of variation of the flood peak; is the skewness coefficient of the flood peak sequence; The peak sequence The design value of the frequency; It is a collection of design results for the maximum annual flood volume; The maximum annual flood duration The multi-year average of The maximum annual flood duration The coefficient of variation of The maximum annual flood duration The skewness coefficient of The maximum annual flood duration No. Frequency design value;

[0029] For the Typical Year A set of flood processes with different frequencies; is the number of typical years; For the Typical Year A set of interval flood processes with frequencies; for Flood Process Collection Reservoir Flood flow during the period; for Typical Year The frequency interval flood process; for Flood Process Collection Reservoir Interval flood volume in the time period; and Respectively represent the number of reservoirs and the total number of calculation periods

[0030] Further, the S4 is specifically:

[0031] According to the upstream and downstream relationship of the controlling reservoir group, the inflow , discharge capacity , Maximum flood discharge control index , calculate step by step from upstream to downstream, and analyze and calculate the outflow of each reservoir , Flood storage capacity , the amount of flood water to be stored in the upstream reservoirs , and then form the spatiotemporal distribution map of the flood storage capacity of reservoir groups with different frequencies in each typical year :

[0032] ;

[0033] ;

[0034] in, Indicates Reservoir The set of flood volume to be stored in a time period; For the Reservoir Inbound flow during the time period; For the Reservoir Flood discharge control threshold for the time period; For the Reservoir Outbound flow in the time period; For the The upstream reservoir Outbound flow in the time period; For the Reservoir The amount of flood water to be stored in a certain period of time; For the Reservoir Total flood storage capacity of the reservoir group during the period; For the The time period of the period is long.

[0035] Further, the S5 is specifically:

[0036] According to the spatiotemporal distribution characteristics of the flood storage capacity of the reservoir group, the minimum flood control storage capacity of each reservoir is analyzed step by step from the upstream, and the flood storage capacity of each reservoir at each typical frequency is quantitatively calculated. and lack of flood storage capacity The shortfall in flood storage will be calculated based on the remaining storage capacity of the upstream reservoir group. The weighting factor Distribute to upstream reservoirs at all levels, and finally obtain the minimum flood control storage capacity of the reservoir group based on the difference in design flood volume , and then formulate flood control storage capacity utilization plans for reservoir groups at different frequencies in different typical years :

[0037] ;

[0038] ;

[0039] For the The flood storage capacity of each reservoir; For the The flood storage capacity of each reservoir; For the Remaining storage capacity of the reservoir; Indicates The remaining storage capacity of the upstream reservoirs; For the The minimum flood control storage capacity of each reservoir; For the The allocation weighting coefficient of the reservoir.

[0040] Further, the S6 is specifically:

[0041] Flood control storage capacity utilization plan of reservoir groups at different frequencies in different typical years Based on the minimum use of flood control storage capacity Calculate the controlled water levels of different frequencies of the control reservoir group , forming a hierarchical water level matrix library for flood control of reservoir groups based on differences in design flood volumes :

[0042] .

[0043] The beneficial effects of the present invention are: establishing characteristic parameters and state variable sets of reservoir groups, selecting control sections and flood control indicators of downstream protection objects, establishing a series of reservoirs with overall design floods of different frequencies, deducing the spatiotemporal distribution of the flood storage volume of the reservoir group based on the discharge capacity, calculating the minimum flood control storage capacity scheme for the reservoir group, and designing a graded water level for flood control of the reservoir group based on the difference in design flood volume. While making full use of the flood resource regulation and storage capacity of the reservoir group, a red line for flood control safety control in the river basin to cope with flood magnitudes of different frequencies and regional compositions is provided for the reservoir group. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of a flood control water level classification method for a group of reservoirs based on differences in design flood volumes;

[0045] Figure 2 This is a distribution map of cascade reservoirs in a river basin;

[0046] Figure 3 This is the dispatching diagram of flood control water level lines of reservoir 1 at different frequencies in a typical year of 1965. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] A flood control water level classification method for a reservoir group based on design flood volume differences comprises the following steps:

[0049] S1. Establish reservoir group characteristic parameters and state variable sets ;

[0050] According to the design results of the control reservoir group, the normal water storage level of each reservoir is extracted , Dead water level , flood limit water level , flood control high water level , water level and storage capacity curve , discharge capacity curve , flood control storage capacity , corresponding storage capacity for flood control high water level , establish the characteristic parameter set of the reservoir group At the same time, the water level 、Storage capacity , Inbound traffic , discharge capacity , outbound traffic , flood discharge control threshold , the total flood storage capacity of the reservoir group , establish the state variable set of the reservoir group , combined to form the reservoir group characteristic parameters and state variable set ;

[0051] ;

[0052] in, For the Reservoirs; The number of reservoirs in a cascade reservoir group; and All are curve functions;

[0053] S2. Select the downstream protection object control section and flood control indicators ;

[0054] S3. Establish a series library of overall design floods of different frequencies in the basin ;

[0055] S4. Determine the spatiotemporal distribution of flood storage capacity of a reservoir group based on discharge capacity;

[0056] S5. Method for calculating the minimum flood control storage capacity of a reservoir group considering different frequency design flood volumes;

[0057] S6. Flood control and graded water levels of reservoir groups based on differences in design flood volumes.

[0058] The S2 is specifically:

[0059] According to the flood control task of the control reservoir group, the downstream protection objects are analyzed and selected to control the cross section according to the topological structure of the natural water system, the layout of water projects and the flood control planning requirements of the basin in the study area. The flood control discharge flow rate is used as the maximum flood discharge control index. :

[0060] ;

[0061] For the The maximum flood discharge control index of each control section; The number of sections controlled for downstream protection objects;

[0062] The flood control and discharge flow can be determined based on the corresponding peak flow results of the approved flood control standards of the protection objects. If there are no corresponding peak flow results, it can be obtained based on the flood control guarantee water level combined with the cross-section water level-flow relationship.

[0063] The S3 is specifically:

[0064] The most downstream control section is used as the overall design flood control section , based on the mean and coefficient of variation of long series flood peaks, flood volumes, and flood volumes at the dam site sections and control sections of the control reservoir group , skewness coefficient and different frequency design values ​​to form a design results set ; Take the corresponding design flood processes of different frequencies in typical years as the typical process set , comprehensive design flood series library with different frequencies :

[0065] ;

[0066] ;

[0067] in, Design a collection of results for the flood peak; It is the multi-year average of long-sequence flood peaks; is the coefficient of variation of the flood peak; is the skewness coefficient of the flood peak sequence; The peak sequence The design value of the frequency; It is a collection of design results for the maximum annual flood volume; The maximum annual flood duration The multi-year average of The maximum annual flood duration The coefficient of variation of The maximum annual flood duration The skewness coefficient of The maximum annual flood duration No. Frequency design value;

[0068] For the Typical Year A set of flood processes with different frequencies; is the number of typical years; For the Typical Year A set of interval flood processes with frequencies; for Flood Process Collection Reservoir Flood flow during the period; for Typical Year The frequency interval flood process; for Flood Process Collection Reservoir Interval flood volume in the time period; and They represent the number of reservoirs and the total number of calculation periods respectively.

[0069] The S4 is specifically:

[0070] According to the upstream and downstream relationship of the controlling reservoir group, the inflow , discharge capacity , Maximum flood discharge control index , calculate step by step from upstream to downstream, and analyze and calculate the outflow of each reservoir , Flood storage capacity , the amount of flood water to be stored in the upstream reservoirs , and then form the spatiotemporal distribution map of the flood storage capacity of reservoir groups with different frequencies in each typical year :

[0071] ;

[0072] ;

[0073] in, Indicates Reservoir The set of flood volume to be stored in a time period; For the Reservoir Inbound flow during the time period; For the Reservoir Flood discharge control threshold for the time period; For the Reservoir Outbound flow in the time period; For the The upstream reservoir Outbound flow in the time period; For the Reservoir The amount of flood water to be stored in a certain period of time; For the Reservoir Total flood storage capacity of the reservoir group during the period; For the The time period of the period is long.

[0074] The S5 is specifically:

[0075] According to the spatiotemporal distribution characteristics of the flood storage capacity of the reservoir group, the minimum flood control storage capacity of each reservoir is analyzed step by step from the upstream, and the flood storage capacity of each reservoir at each typical frequency is quantitatively calculated. and lack of flood storage capacity The shortfall in flood storage will be calculated based on the remaining storage capacity of the upstream reservoir group. The weighting factor Distribute to upstream reservoirs at all levels, and finally obtain the minimum flood control storage capacity of the reservoir group based on the difference in design flood volume , and then formulate flood control storage capacity utilization plans for reservoir groups at different frequencies in different typical years :

[0076] ;

[0077] ;

[0078] For the The flood storage capacity of each reservoir; For the The flood storage capacity of each reservoir; For the Remaining storage capacity of the reservoir; Indicates The remaining storage capacity of the upstream reservoirs; For the The minimum flood control storage capacity of each reservoir; For the The allocation weighting coefficient of the reservoir.

[0079] The S6 is specifically:

[0080] Flood control storage capacity utilization plan of reservoir groups at different frequencies in different typical years Based on the minimum use of flood control storage capacity Calculate the controlled water levels of different frequencies of the control reservoir group , forming a hierarchical water level matrix library for flood control of reservoir groups based on differences in design flood volumes

[0081] :

[0082] ;

[0083] in, Indicates Typical Year A set of graded water levels for flood control of a reservoir group with a certain frequency.

[0084] Embodiment 1

[0085] like Figure 2 As shown in the figure, a cascade reservoir group in a certain river basin is selected as the research case, which includes 3 reservoirs, 1 downstream flood control point and two interval inflows, namely reservoirs 1, 2 and 3 from upstream to downstream.

[0086] According to the design results of the control reservoir group, the normal water storage level of each reservoir is extracted , unit: m; dead water level , unit m, flood limit water level , unit: m; flood control high water level , unit: m; water level storage capacity curve , discharge capacity curve , flood control storage capacity , unit: 100 million m 3 ; Corresponding storage capacity for flood control high water level , unit: 100 million m 3 , establish a reservoir group characteristic parameter set At the same time, the water level 、Storage capacity , Inbound traffic , discharge capacity , outbound traffic , flood discharge control threshold , total flood storage capacity of the reservoir group , establish a set of reservoir group state variables , combined to form reservoir group characteristic parameters and state variables .

[0087] According to the flood control task of the control reservoir group, the protection objects and control sections of the downstream of reservoir 3 were analyzed and selected according to the topological structure of the natural water system, the layout of water projects and the flood control planning requirements of the basin in the study area. The flood control discharge flow rate is used as the maximum flood discharge control index. ;

[0088] The control section downstream of reservoir 3 is used as the overall control section for the overall design flood. , based on the mean of long series flood peaks and flood volumes at the dam site sections and control sections of the control reservoir group, , and , , and Different frequency design values ​​form a design result set ; The design flood processes with different frequencies in typical years such as 1965, 1998 and 2020 are taken as the typical process set , comprehensive design flood series library with different frequencies ;

[0089]

[0090] According to the upstream and downstream relationship of the controlling reservoir group, the inflow , discharge capacity , Maximum flood discharge control index , calculate step by step from upstream to downstream, and analyze and calculate the outflow of each reservoir , Flood storage capacity , total flood storage capacity of the reservoir group , thus forming the spatiotemporal distribution map of the flood storage capacity of reservoirs with different frequencies of P=20%, P=10%, P=5%, and P=2% in typical years of 1965, 1998, and 2020 .

[0091] According to the spatiotemporal distribution characteristics of the flood storage capacity of the reservoir group, the minimum flood control storage capacity of each reservoir is analyzed step by step from the upstream, and the flood storage capacity of each reservoir with different typical frequencies is quantitatively calculated. and lack of flood storage capacity The shortfall in flood storage will be calculated based on the remaining storage capacity of the upstream reservoir group. The weighting factor Distribute to reservoirs at all levels upstream, and finally obtain the least flood control storage capacity of the reservoir group , and then formulate flood control storage capacity utilization plans for reservoir groups at different frequencies in different typical years Taking the design flood of P=2% in 1965 as an example, the calculation results of each reservoir are shown in the following table and Figure 3 As shown:

[0092]

[0093] Flood control storage capacity utilization plan of reservoir groups at different frequencies in different typical years Based on the minimum use of flood control storage capacity Calculate the controlled water levels of different frequencies of the control reservoir group , forming a hierarchical water level matrix library for flood control of reservoir groups based on differences in design flood volumes The dispatching diagram of different frequency graded flood control water level lines of Reservoir 1 in a typical year of 1965 is as follows: Figure 3 shown.

[0094] DFD − GCL = { [ 2865 . 00 ， 1880 . 00 ， 1199 . 26 ] P = 20 % ︷ 1965 [ 2865 . 00 ， 1880 . 00 ， 1198 . 38 ] P = 20 % ︷ 1998 [ 2864 . 42 , 1880 . 00 , 1197 . 21 ] P = 10 % [ 2865 . 00 , 1880 . 00 , 1191 . 63 ] P = 10 % [ 2862 . 96 , 1879 . 55 , 1193 . 42 ] P = 5 % [ 2 8 6 1 . 9 7 , 1 8 7 6 . 6 3 , 1 1 9 0 . 0 0 ] P = 5 % [ 2856 . 66 , 1872 . 39 , 1190 . 00 ] P = 2 % [ 2854 . 54 , 1868 . 23 , 1190 . 00 ] P = 2 % } DFD − GCL = { [ 2865 . 00 ， 1880 . 00 ， 1200 . 00 ] P = 20 % ︷ 2020 [ 2856 . 25 , 1880 . 00 , 1198 . 58 ] P = 10 % [ 2 8 5 2 . 0 7 , 1 8 7 9 . 3 3 , 1 1 9 1 . 4 4 ] P = 5 % [ 2846 . 18 , 1864 . 81 , 1190 . 00 ] P = 2 % } .

[0095] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be based on the attached claims.

Claims

1. A flood control water level classification method for a group of reservoirs based on differences in designed flood volumes, characterized in that: The following steps are involved: S1. Establish reservoir group characteristic parameters and state variable set ; According to the design results of the control reservoir group, the normal water storage level of each reservoir is extracted , Dead water level , flood limit water level , flood control high water level , water level and storage capacity curve , discharge capacity curve , flood control storage capacity , corresponding storage capacity for flood control high water level , establish the characteristic parameter set of the reservoir group At the same time, the water level 、Storage capacity , Inbound traffic , discharge capacity , outbound traffic , flood discharge control threshold , the total flood storage capacity of the reservoir group , establish the state variable set of the reservoir group , combined to form the reservoir group characteristic parameters and state variable set ; ； in, For the Reservoirs; The number of reservoirs in a cascade reservoir group; and All are curve functions; S2. Select the downstream protection object control section and flood control indicators ; S3. Establish a series library of overall design floods of different frequencies in the basin ; S4. Determine the spatiotemporal distribution of flood storage capacity of a reservoir group based on discharge capacity; S5. Method for calculating the minimum flood control storage capacity of a reservoir group considering different frequency design flood volumes; The S5 is specifically: According to the spatiotemporal distribution characteristics of the flood storage capacity of the reservoir group, the minimum flood control storage capacity of each reservoir is analyzed step by step from the upstream, and the flood storage capacity of each reservoir at each typical frequency is quantitatively calculated. and lack of flood storage capacity The shortfall in flood storage will be calculated based on the remaining storage capacity of the upstream reservoir group. The weighting factor Distribute to upstream reservoirs at all levels, and finally obtain the minimum flood control storage capacity of the reservoir group based on the difference in design flood volume , and then formulate flood control storage capacity utilization plans for reservoir groups at different frequencies in different typical years : ； ； For the The flood storage capacity of each reservoir; For the The flood storage capacity of each reservoir; For the Remaining storage capacity of the reservoir; Indicates The remaining storage capacity of the upstream reservoirs; For the The minimum flood control storage capacity of each reservoir; For the The allocation weighting coefficient of the reservoir; S6. Flood control and water level classification of reservoir groups based on differences in design flood volumes.

2. A flood control water level classification method for a group of reservoirs based on design flood volume differences according to claim 1, characterized in that: The S2 is specifically: According to the flood control task of the control reservoir group, the downstream protection objects are analyzed and selected to control the cross section according to the topological structure of the natural water system, the layout of water projects and the flood control planning requirements of the basin in the study area. The flood control discharge flow rate is used as the maximum flood discharge control index. : ； For the The maximum flood discharge control index of each control section; The number of sections controlled for downstream protection objects; The flood control and discharge flow can be determined based on the corresponding peak flow results of the approved flood control standards of the protection objects. If there are no corresponding peak flow results, it can be obtained based on the flood control guarantee water level combined with the cross-section water level-flow relationship.

3. A flood control water level classification method for a group of reservoirs based on design flood volume differences according to claim 2, characterized in that: The S3 is specifically: The most downstream control section is used as the overall design flood control section , based on the mean and coefficient of variation of long series flood peaks, flood volumes at the dam site sections and control sections of the control reservoir group , skewness coefficient and different frequency design values ​​to form a design results set ; The typical process set is the corresponding design flood process with different frequencies in typical years. , comprehensive design flood series library with different frequencies : ； ； in, Design a collection of results for the flood peak; It is the multi-year average of long-sequence flood peaks; is the coefficient of variation of the flood peak; is the skewness coefficient of the flood peak sequence; The peak sequence The design value of the frequency; It is a collection of design results for the maximum annual flood volume; The maximum annual flood duration The multi-year average of The maximum annual flood duration The coefficient of variation of The maximum annual flood duration The skewness coefficient of The maximum annual flood duration No. Frequency design value; For the Typical Year A set of flood processes with different frequencies; is the number of typical years; For the Typical Year A set of interval flood processes with frequencies; for Flood Process Collection Reservoir Flood flow during the period; for Typical Year The frequency interval flood process; for Flood Process Collection Reservoir Interval flood volume in the time period; and They represent the number of reservoirs and the total number of calculation periods respectively.

4. A flood control water level classification method for a group of reservoirs based on design flood volume differences according to claim 3, characterized in that: The S4 is specifically: According to the upstream and downstream relationship of the controlling reservoir group, the inflow , discharge capacity , Maximum flood discharge control index , calculate step by step from upstream to downstream, and analyze and calculate the outflow of each reservoir , Flood storage capacity , the amount of flood water to be stored in the upstream reservoirs , and then form the spatiotemporal distribution map of the flood storage capacity of reservoir groups with different frequencies in each typical year : ； ； in, Indicates Reservoir The set of flood volume to be stored in a time period; For the Reservoir Inbound flow during the time period; For the Reservoir Flood discharge control threshold for the time period; For the Reservoir Outbound flow in the time period; For the The upstream reservoir Outbound flow in the time period; For the Reservoir The amount of flood water to be stored in a certain period of time; For the Reservoir Total flood storage capacity of the reservoir group during the period; For the The time period of the period is long.

5. A flood control water level classification method for a group of reservoirs based on design flood volume differences according to claim 4, characterized in that: The S6 is specifically: Flood control storage capacity utilization plan of reservoir groups at different frequencies in different typical years Based on the minimum use of flood control storage capacity Calculate the controlled water levels of different frequencies of the control reservoir group , forming a hierarchical water level matrix library for flood control of reservoir groups based on differences in design flood volumes : ； in, Indicates Typical Year A set of graded water levels for flood control control of a reservoir group with a certain frequency.

Images