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In this paper, two kinds of occurrence mechanism on the phenomenon ofconcentration and the formation of delta shock waves are analyzed andidentified in the flux approximation limit of Riemann solutions to the extendedChaplygin gas equations with Coulomb-like friction, whose special case can alsobe seen as the model of the magnetogasdynamics with Coulomb-like friction.Firstly, by introducing a transformation, the Riemann problem for the extendedChaplygin gas equations with Coulomb-like friction is solved completely.Secondly, we rigorously show that, as the pressure vanishes, any two-shockRiemann solution to the nonhomogeneous extended Chaplygin gas equations tendsto a {\delta}-shock solution to the corresponding nonhomogeneous transportationequations, and the intermediate density between the two shocks tends to aweighted {\delta}-measure that forms the {\delta}-shock; anytwo-rarefaction-wave Riemann solution to the nonhomogeneous extended Chaplygingas equations tends to a two-contact-discontinuity solution to thecorrespongding nonhomogeneous transportation equations, and the nonvacuumintermediate state between the two rarefaction waves tends to a vacuum state.At last, we also show that, as the pressure approaches the generalizedChaplygin pressure, any two-shock Riemann solution to the nonhomogeneousextended Chaplygin gas equations tends to a delta-shock solution to thecorrespongding nonhomogeneous generalized Chaplygin gas equations. In a word,we have generalized all the results about the vanishing pressure limit nowavailable for homogeneous equations to the nonhomogeneous case.

Concentration in the flux approximation limit of Riemann solutions to the extended Chaplygin gas equations with Coulomb-like friction