Medium-and-long-term dynamic landform evolution numerical simulation method for mountain stream strong tide estuary bifurcated section

Abstract

The invention relates to a mountain stream strong tide estuary bifurcated section medium-and-long-term dynamic landform evolution numerical simulation method. The method comprises the following steps: establishing a two-dimensional water and sediment mathematical model, and calibrating parameters such as roughness; determining characteristic hydrological conditions of long-period simulation by considering runoff characteristics and strong tide estuary tide characteristics with relatively large mountain stream flow flood and dry difference; generalizing a long-period flow process by using a differential evolution method, and determining a flood flow process according to a year-on-year scaling method; and obtaining an open sea tide level process boundary condition. According to the method, the digital-analog calculation efficiency is improved while the numerical simulation accuracy is guaranteed, and the calculation result can reflect the bed making influence of different runoff flow processes and strong tide estuary tide. By adopting the method disclosed by the invention, the medium-and-long-term dynamic landform evolution process of the mountain stream strong tide estuary can be accurately reproduced.

Description

technical field [0001] The invention relates to the technical field of hydrological analysis and numerical simulation of rivers and coasts, in particular to a numerical simulation method for mid- and long-term dynamic landform evolution in a branch section of a mountain-river strong tidal estuary. Background technique [0002] The mid- and long-period dynamic geomorphological model simulates and interprets long-term geomorphological changes based on short-time-scale dynamic processes. With the needs of ecological civilization construction and river protection and utilization, the medium and long-term numerical simulation on the scale of decades or even centuries has attracted more and more attention, and has become one of the hot issues in river and coastal research at home and abroad. Mathematical models can simulate hydrodynamic and geomorphological changes on time scales from seconds to hundreds of years by using typical hydrological process settings and geomorphic accele...

AI Technical Summary

Problems solved by technology

In the past, most of the generalization was manual, the generalization efficiency was low, and it was greatly affected by the operator's subjective influence, so the reference value was not great

In addition, in the traditional medium and long-term dynamic landform simulation method, the MF value method adopts a fixed shape multiplication factor

Due to the large difference between the flood and dry flow of typical mountain streams (for example, the Oujiang River flow rate can reach up to 2000), and the flood peak rises and falls sharply, the conventional fixed MF and average flow generalization cannot reflect the difference between the flood and dry conditions of mountain streams. How to correctly reflect the characteristics of mountain stream runoff and strong tides is the key issue for the accuracy of dynamic landform evolution simulation

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