Simulation method and system for evolution of flood scoured scarp riverbed

[0055] as attached figure 2 It is a longitudinal section diagram of a calculation section of a steep riverbed. Taking the longitudinal section of a calculation section of a steep riverbed as an example, the present embodiment is based on the following non-constant water, sand, and riverbed deformation equations, and its mathematical formula is as follows:

[0056] Water flow continuity equation: ∂ h ∂ t + ∂ q ∂ x = 0 - - - ( 1 )

[0057] Water flow equation of motion: ∂ q ∂ t + ∂ ∂ x (

[0117] This embodiment provides a steep river bed flood scour evolution simulation system, its specific implementation structure is as follows figure 2 As shown, specifically, the following modules may be included: a discrete mixing module 21, a variable U solution module 22, a differential reconstruction module 23, a single-width sediment transport rate module 24 and a riverbed surface elevation module 25; wherein,

[0118] Discrete mixing module 21: it is used for adopting space discrete sub-item mixing method to water flow vector equation: ∂ U ∂ t + ∂ F ∂ x = S process;

[0119] where the variable U = y q ,