Nested self-stabilization confluence calculation method for space-time dynamic optimization

Abstract

The invention discloses a nested self-stabilization confluence calculation method based on space-time dynamic optimization, belonging to the technical field of hydrology. The method quantifies the influence of roughness, river channel bottom slope and upstream incoming water on confluence calculation on the basis of physical factors influencing confluence calculation, and automatically optimizes and finds a proper space-time step length, thus the nested self-stabilization confluence calculation method based on space-time dynamic optimization is provided. Therefore, the precision and the reliability of a calculation result are ensured, and meanwhile, the problem of river channel confluence calculation of mountainous small and medium-sized watersheds with obvious geographic feature spatial differentiation is solved. The method is mainly applied to a basin digital elevation model, data sources are stable and reliable, a function relation between variables in the method is clear, rapid andautomatic execution of river channel confluence calculation in watersheds is facilitated, extraction steps are simplified through the digital watershed technology, the objective rationality of results is guaranteed, and deep development of digital hydrology and mountain torrent prevention and treatment research of mountainous small and medium watersheds can be further promoted.

Description

technical field [0001] The invention belongs to the technical field of hydrology, and in particular relates to a nested self-stabilizing confluence calculus method for space-time dynamic optimization. Background technique [0002] my country's confluence area is 200km 2 to 3000km 2 There are nearly 9,000 small and medium-sized rivers. In recent years, affected by climate change, sudden floods of small and medium-sized rivers caused by local heavy rainfall have occurred frequently, and have become the main disasters causing casualties. According to statistics, my country's small and medium-sized river flood disasters and mountain torrent geological disasters account for about 70% to 80% of the national flood disaster economic losses, and the death toll accounts for about 2 / 3, posing a serious threat to the safety of people's lives and property. Accurate and reliable early warning and forecasting of sudden flood has become an important problem to be solved urgently. [0003...

AI Technical Summary

Problems solved by technology

Since this method needs to repeatedly adjust the space-time step size, it greatly wastes the calculation time and reduces the calculation efficiency, and the space-time step size finally found can only meet the most basic stability conditions, which will reduce the calculation time to a certain extent. the accuracy of

As a result, the calculation of river confluence is time-consuming, laborious and inaccurate, which leaves hidden dangers for the prevention and control of flash floods in small and medium-sized mountainous watersheds

[0006] Therefore, ignoring the method of determining the appropriate time-space step is not conducive to the development of mountain torrent control in small and medium-sized watersheds

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