As a continuation of the initial study on the morphology of the Douro mouth, performed by Hydronamic in 1982, the Administracao dos Portos do Douro e Leixoes commisioned Hydronamic bv to construct a mathematical hydro-morphological model of the Douro mouth. This second part of the morphological study of the Douro mouth is divided into three phases, viz.: a. Additional measurements during a period of low river discharge. The results are presented in report part 7. b. A statistical analysis of the topography of the Cabedelo from 1872 until 1983. The results are presented in report part 8. c. The construction of a mathematical model of the Douro mouth. This report presents a description of the component parts, the operation and the calibration of the mathematical model. The used model is a probabilistic model using stochastic techniques to simulate the variations of the Cabedelo.