River flood forecasting method based on discrete generalized Nash routing model

Abstract

The invention discloses a river flood forecasting method based on a discrete generalized Nash routing model. By introducing the detention storage curve, simplifying a generalized Nash routing model, and establishing a discrete generalized Nash routing model, a river flood forecasting method is provided based on this model. The method expresses the outflow process of a river lower section as a linear combination of the inflow at the beginning and the end of a period and the outflow of the current time and a plurality of previous time moments, and obtains a weight coefficient according to the detention storage curve. The river flood forecasting method based on a discrete generalized Nash routing model, because integrating some historical effective information, can improve forecasting accuracy, is simple and visual, and can be easily popularized and applied in engineering practice.

Description

technical field [0001] The invention belongs to the technical field of hydrological forecasting, and more specifically relates to a river channel flood forecasting method based on a discrete generalized Nash confluence model. Background technique [0002] The existing channel flood calculation in hydrology is based on Saint-Venant's equations, and adopts the method of generalized analysis to generalize the continuity equation into a water balance equation and generalize the dynamic equation into a channel-storage curve equation; according to the channel-storage curve There are different expression forms, mainly including Muskingum method, characteristic river length method and lag flow algorithm. [0003] In actual work, it is difficult for the actual river section to be calculated to satisfy the channel-storage curve equation simplified by these methods; the existing technology adopts segmented and continuous calculation methods, such as the Muskingum Confluence Curve, Kali...

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Problems solved by technology

[0003] In actual work, it is difficult for the actual river section to be calculated to satisfy the channel-storage curve equation simplified by these methods; the existing technology adopts segmented and continuous calculation methods, such as the Muskingum Confluence Curve, Kalinin Unit Line and Nash Instantaneous Unit Line ; The essence of this type of method is to analyze the outflow process formed by the unit inflow, without considering the change of the initial water storage capacity of the channel; while the generalized Nash confluence model based on the Nash instantaneous unit line theory takes the regression of the initial water storage capacity of the channel The process is included, which improves the prediction accuracy to a certain extent; however, the generalized Nash confluence formula is complex in form and includes integral terms, which limits its application in engineering

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