Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach

Details Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach

2008-01-10

arxiv.org/abs/0801.1683v1

Physics

Atmospheric and Oceanic Physics

Paper contents 14 pages and 12 figures. Some results of this work was presented on the sixth international conference on optim

Scientific paper

In meteorological and oceanological studies the classical approach for finding the numerical solution of the regional model consists in formulating and solving the Cauchy-Dirichlet problem. The related boundary conditions are obtained by linear interpolation of data available on a coarse grid (global data), to the boundary of regional model. Errors, in boundary conditions, appearing owing to linear interpolation may lead to increasing errors in numerical solution during integration. The methods developed to reduce these errors deal with continuous dynamic assimilation of known global data available inside the regional domain. Essentially, this assimilation procedure performs a nudging of large-scale component of regional model solution to large-scale global data component by introducing the relaxation forcing terms into the regional model equations. As a result, the obtained solution is not a valid numerical solution of the original regional model. In this work we propose the optimization approach which is free from the above-mentioned shortcoming. The formulation of the joint problem of finding the regional model solution and data assimilation, as a PDE-constrained optimization problem, gives the possibility to obtain the exact numerical solution of the regional model. Three simple model examples (ODE Burgers equation, Rossby-Oboukhov equation, Korteweg-de Vries equation) were considered in this paper. The result of performed numerical experiments indicates that the optimization approach can significantly improve the precision of the sought numerical solution, even in the cases in which the solution of Cauchy-Dirichlet problem is very sensitive to the errors in the boundary condition.

Affiliated with

Also associated with

No associations

Rating

Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuing dynamic assimilation of the inner region data in hydrodynamics modelling: Optimization approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-547164