Small reservoir flood level forecasting method based on two-dimensional-zero-dimensional coupling model

Abstract

The invention discloses a small reservoir flood level forecasting method based on a two-dimensional-zero-dimensional coupling model. According to the current situation that hydrological data of a drainage basin where a small reservoir is located is deficient, the drainage basin where the reservoir is located is divided into two parts with the water surface boundary corresponding to the limited water level of the reservoir in the flood season as a dividing line, and the upstream land part adopts a two-dimensional hydrodynamic model to simulate the surface runoff process; the downstream reservoir area part adopts a zero-dimensional water conservation model to calculate the reservoir water level, the flow of the coupling edge of the two-dimensional hydrodynamic model is used as the inflow condition of the zero-dimensional water conservation model, the newly calculated reservoir water level is used as the control boundary of the next time step of the two-dimensional hydrodynamic model, and the two models are calculated in a rolling manner; therefore, the purpose of reservoir water level forecasting is achieved. According to the method, only two parameters which do not depend on historical hydrological data need to be considered, and a new technical solution can be provided for forecasting the water level of the small reservoir in a watershed lack of historical hydrological data.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering, and in particular relates to a small reservoir flood level forecasting method based on a two-dimensional-zero-dimensional coupling model. Background technique [0002] According to the data of the first national water conservancy census, there are 98,000 reservoirs in my country, 95% of which are small reservoirs. Most of these small reservoirs were built in the 1960s and 1970s. During the special construction period, these small reservoirs belonged to "three-sided" projects. Many small reservoirs have congenital defects. After 50 years, the design service life has been reached, and the problem of disease insurance is very prominent. In recent years, under the background of climate change with frequent local extreme heavy rainfall, dam failures of small reservoirs in my country have occurred from time to time. The dam failure of the reservoir will bring serious economic losses dow...

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Problems solved by technology

[0003] Compared with large reservoirs, the ownership of small reservoirs is generally owned by local collectives, the level of management and informatization are lower, and there are generally fewer hydrological monitoring stations in the reservoir basin. Therefore, some traditional hydrological model forecasting methods suitable for large reservoirs are generally A large amount of historical measured hydrological data is needed to calibrate the model parameters. These methods are not suitable for small reservoir basins. For example, the Xin'anjiang model with three water sources is widely used in my country. It has nearly 20 parameters for flow generation and confluence, and They are all conceptual and must be calibrated with multiple historical flood data before they can be used. It is difficult to apply to the watersheds where small reservoirs are located where hydrological data are scarce.

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