1. Departamento de Ciencias y Técnicas del Agua y del Medio Ambiente; E.T.S.I. de Caminos, Canales y Puertos, Universidad de Cantabria. Avda. de los Castros; Santander Spain
2. Division of Earth and Ocean Sciences, Nicholas School of the Environment, Center for Nonlinear and Complex Systems; Duke University; Durham NC USA
3. Department of Geological Sciences, Coastal Environmental Change Laboratory; University of North Carolina; Chapel Hill NC USA