Design method of flood control storage capacity for inland river tail flood control reservoir
By adopting the long series method to calculate the annual water inflow and set the storage capacity in an overlapping manner, the problem of reasonable combination of storage capacity design for inland river tail flood control reservoirs was solved, and the economically reasonable allocation of reservoir capacity and engineering safety were achieved.
Patent Information
- Application Number
- CN202111186720.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-10-12
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2041-10-12
AI Technical Summary
Existing technologies have failed to effectively solve the flood control storage capacity design problem of inland river tailwater flood control reservoirs, especially how to reasonably combine the reservoir dam's own flood flow and the total annual discharge volume of the tailwater flood control standard, resulting in insufficient project safety and economy.
The long series method is used to calculate the frequency of the annual water inflow, and the tailwater flood control storage capacity is determined in combination with the downstream ecology and river water demand. The storage capacity above the flood control high water level is used as the flood regulation storage capacity of the reservoir dam. The beneficial storage capacity and the flood control storage capacity are set overlapping to meet the ecological water demand.
It has achieved an economically reasonable allocation of reservoir capacity, ensured the safety of the dam project, avoided excessive water inflow, met the ecological water demand of the downstream river, and improved flood control effects and project safety.
Smart Images
Figure CN113868746B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a flood control reservoir of a hydraulic structure, in particular to a flood control storage capacity design method of a flood control reservoir at the tail bank of an inland river. Background Art
[0002] The traditional reservoir flood control storage capacity is set based on the flood process and downstream river flood control requirements. The flood is adjusted from the flood season limit water level, and the flood events are determined according to the downstream river flood control standards and dam flood control standards. The flood control high water level, design flood level and verification flood level are adjusted. The downstream river flood control is achieved by controlling the discharge flow of the reservoir. The technical solutions are as follows: Figure 2 shown.
[0003] Inland river tailgates often contain natural lakes. Tailgate flood control is not about controlling peak flood flows but rather total flood volume; it's about protecting against tailgate lakes rather than downstream river flows. Therefore, the goal of inland river tailgate flood control is not to control downstream river flows but rather to control the total annual discharge volume based on design standards. The design flood control standards of the reservoir dam itself are far higher than those for tailgate flood control, and the reservoir's own flood control is designed based on the flow of individual flood events. Therefore, how to combine the total annual discharge volume of tailgate flood control with the dam's own individual flood events is a key issue in the design of tailgate flood control reservoir capacity, and currently no mature method exists to address this issue, either domestically or internationally. Summary of the Invention
[0004] The present invention aims to provide a method for designing the flood control storage capacity of an inland river tail flood control reservoir.
[0005] To achieve the above object, the present invention adopts the following technical solutions:
[0006] The flood control storage capacity design method of the inland river tail flood control reservoir of the present invention comprises the following steps:
[0007] Step 1: Set the water supply and ecological water reservoir capacity below the normal water level to ensure reservoir water supply and river ecological water use;
[0008] Step 2: Set the required flood control storage capacity of the tailwater between the dead water level and the high flood control level of the reservoir. Use the long series method to calculate the frequency of the annual water inflow, and determine the tailwater flood control storage capacity after considering the downstream ecology and river water use.
[0009] Step 3, using the storage capacity above the flood control high water level as the flood control storage capacity of the reservoir dam;
[0010] Step 4: Determine the normal water storage level based on the reservoir water supply and river ecological water use. The area between the normal water storage level and the dead water level is set as the beneficial storage capacity. The beneficial storage capacity is overlapped with the tailwater flood control storage capacity to fully utilize the storage capacity between the flood control high water level and the normal water storage level to meet the downstream river ecological water use demand and realize the reservoir camera sediment discharge application.
[0011] The advantages of the present invention are embodied in the following aspects:
[0012] 1. The storage capacity above the flood control high water level is used as the flood control storage capacity of the reservoir dam. The dam's own flood control storage capacity does not occupy the tailwater flood control storage capacity, avoiding the artificial excessive water inflow caused by special hydrological years that do not meet the tailwater flood control standards, thereby ensuring the safety of the dam project.
[0013] 2. The long series method is used to perform frequency calculations on the annual water inflow, and the tailwater flood control storage capacity is determined after considering the downstream ecology and river water use. Floods of different standards are superimposed on the total flood control storage capacity of the reservoir to determine the reservoir design standard, thereby simplifying flood calculations.
[0014] 3. The normal water storage level is determined based on the water supply of the reservoir and the ecological water use of the river. The beneficial storage capacity between the normal water storage level and the dead water level is overlapped with the tailwater flood control storage capacity to fully utilize the storage capacity between the flood control high water level and the normal water storage level to meet the ecological water use demand of the downstream river and realize the use of reservoir camera sediment discharge.
[0015] 4. The total storage capacity of the reservoir = dead storage capacity + tailwater flood control storage capacity + flood regulation storage capacity. The reservoir storage capacity setting is economical and reasonable, and the project is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the flood control storage capacity setting of the inland river tail flood control reservoir described in the present invention.
[0017] Figure 2 This is a schematic diagram of the traditional reservoir flood control capacity setting. DETAILED DESCRIPTION
[0018] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.
[0019] like Figure 1 As shown, the flood control storage capacity design method of the inland river tail flood control reservoir of the present invention includes the following steps:
[0020] Step 1: Set the water supply and ecological water reservoir capacity below the normal water level to ensure reservoir water supply and river ecological water use;
[0021] Step 2: Set the required flood control storage capacity of the tailwater between the dead water level and the high flood control level of the reservoir. Use the long series method to calculate the frequency of the annual water inflow, and determine the tailwater flood control storage capacity after considering the downstream ecology and river water use.
[0022] Step 3, using the storage capacity above the flood control high water level as the flood control storage capacity of the reservoir dam;
[0023] Step 4: Determine the normal water storage level based on the reservoir water supply and river ecological water use. The area between the normal water storage level and the dead water level is set as the beneficial storage capacity. The beneficial storage capacity and the flood control storage capacity are overlapped to make full use of the storage capacity between the flood control high water level and the normal water storage level to meet the downstream river ecological water use demand and realize the reservoir camera sediment discharge operation.
Claims
1. A method for designing flood control storage capacity of an inland river tail flood control reservoir, characterized by: The steps include: Step 1: Set the water supply and ecological water reservoir capacity below the normal water level to ensure reservoir water supply and river ecological water use; Step 2: Set the required flood control storage capacity of the tailwater between the dead water level and the high flood control level of the reservoir. Use the long series method to calculate the frequency of the annual water inflow, and determine the tailwater flood control storage capacity after considering the downstream ecology and river water use. Step 3, using the storage capacity above the flood control high water level as the flood control storage capacity of the reservoir dam; Step 4: Determine the normal water storage level based on the reservoir water supply and river ecological water use. The area between the normal water storage level and the dead water level is set as the beneficial storage capacity. The beneficial storage capacity and the flood control storage capacity are overlapped to make full use of the storage capacity between the flood control high water level and the normal water storage level to meet the downstream river ecological water use demand and realize the reservoir camera sediment discharge operation.