title: The Chapman-Enskog procedure for an age-structured population model: initial, boundary and corner layer corrections.
abstract: We consider a mathematical model of an age-structured population of some fisheries (for example, anchovies, sardines or soles). Two time scales are involved in the problem: the fast time scale for the migration dynamics and the slow time scale for the demographic process. At a first step, we study the so called 'aggregated' system by means of the semigroups theory. Then, we study the asymptotic behaviour of the model by using the Chapman-Enskog procedure. In particular, we study initial, boundary and corner layer effects in order to obtain the exact initial and boundary conditions the approximated solution has to satisfy.
authors.affiliation: Dipartimento di Matematica Ulisse Dini, Viale Morgagni 67a, 50134 Firenze, Italy. lisi@math.unifi.it
authors.forename: Meri
authors.initials: M
authors.lastname: Lisi
authors.forename: Silvia
authors.initials: S
authors.lastname: Totaro
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D017753:Ecosystem; D005399:Fishes / Q000254:growth & development; D008954:Models, Biological; D011157:Population Dynamics