Time-varying distributed dynamic convergence calculation method

Abstract

The invention discloses a time-varying distributed dynamic confluence calculation method, and belongs to the field of runoff forecasting. According to the method, the terrain index is introduced to describe the spatial non-uniform distribution of the watershed grid water storage capacity, the water storage capacity of each grid can be quantitatively represented, the runoff production calculation result is combined, the watershed full storage grid and the watershed full storage grid can be divided from the grid scale, and a higher-precision input field can be provided for grid flow velocity field calculation; according to the method, a confluence velocity calculation formula considering the time-varying rainfall intensity and the soil water content is provided, and the spatial distribution rule of the flow velocity field is described more accurately; according to the method, the dynamic confluence paths of the drainage basin under different full storage proportions are deduced based on the theoretical basis of runoff production of the full storage area and no full storage and runoff production, the theoretical basis of unit line deduction is perfected, the accuracy of distributed unit line confluence time calculation is improved, the problem that the flood peak of traditional distributed unit line forecasting is large is solved, and the method is suitable for popularization and application. And the flood prediction accuracy is improved.

Description

technical field [0001] The invention belongs to the field of runoff forecasting, and more particularly, relates to a time-varying distributed dynamic confluence calculation method. Background technique [0002] High-precision hydrological forecasting can provide decision-making basis for reservoir regulation, flood control and disaster reduction, and optimal allocation of water resources, and plays an important role in water resources management, water resources development and utilization, and national economic construction. Rainfall runoff modeling mainly includes two parts: runoff and confluence. Unit line is the most widely used confluence calculation method. Commonly used unit line methods include: time period unit line, instantaneous unit line, comprehensive unit line, distributed unit line, etc. [0003] The application of traditional confluence methods has certain limitations. The main problem is that the confluence process of the entire watershed is generalized into...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a time-varying distributed dynamic confluence calculation method, which aims to solve the problems of overestimation of confluence velocity and relatively large flood forecast error in existing time-varying distributed unit line flood forecasting. big technical problem

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