Continuous dam break risk analysis method for cascade reservoir group

Abstract

The invention discloses a continuous dam break risk analysis method for a cascade reservoir group. The method comprises a breach flood calculation module, a dam break flood routing module and a dam overtopping risk analysis module, and a technical method for solving formation, evolution and risk analysis of the continuous dam break flood of the cascade reservoir group is provided from the perspective of risk quantification and early warning prevention. The breach flood calculation adopts a wide-top weir formula to estimate a breach flow process, adopts a hyperbolic curve model to simulate a breach scouring erosion process, and adopts a simplified Bishop method to calculate a breach expansion process; the dam break flood routing is based on a numerical difference method of an HLL format, and a finite volume method of a center format is adopted for calculation; the dam overtopping risk analysis adopts a method based on time infinitesimal, and a water balance equation and a storage and discharge equation of a reservoir are simultaneously solved period by period. According to the method, the risk of continuous overtopping or dam break of a barrier dam, an earth and rockfill dam, a concrete dam and the like in a drainage basin cascade reservoir group can be rapidly analyzed and evaluated, and technical support is provided for improving the emergency rescue working efficiency and rapidly formulating an emergency treatment scheme.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, and is a risk analysis method for continuous dam breaks of cascade reservoir groups, a risk analysis and numerical calculation technology for continuous dam break floods in a river basin, which can be used for the risk design of cascade hydraulic structures and the safety of cascade reservoir groups Management, emergency disposal of barrier lakes in the watershed, emergency management of cascade hydropower stations, and formulation of flood control programs provide quantitative technical support. Background technique [0002] The cascade reservoir group is the basic form of river water resource development, and it is an inevitable choice for large-scale hydropower resource development. my country has built more than 98,000 reservoir dams of various types, forming a series of reservoir groups. These reservoirs have played an irreplaceable role in flood control and disas...

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Problems solved by technology

[0003] Existing numerical calculation methods for dam breaks mostly use simple mathematical models to simulate the dam break process without considering the physical mechanism of dam breaks, and cannot more realistically simulate the dam break flood process, and have not formed a systematic cascade reservoir group for continuous dam break risks Analytical methods cannot quickly analyze the risk of flooding or dam failure of downstream cascade reservoirs; or use complex high-performance numerical calculation methods to calculate the evolution of dam break floods, which require high accuracy of basic data such as terrain and river channel shape, and the calculation takes a long time. Unable to meet the actual needs of emergency rescue work in the river basin

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