Professor Hermelin conducted studies on geomorphology (evolution of Colombian landscapes, erosion and chemical weathering, distribution of Quaternary volcanic ash) in the Central and Western Cordilleras, in Cordoba and the Archipelago of San Andres and Providencia also works on Environmental Geology (mapping and threat prevention, impact of human activities on ecosystems, physical planning of urban and rural territory). He currently undertakes projects on the highlands of Antioquia, the breakdown of stability of slopes subjected to grazing, decomposition of Antioquia Batholith rocks and natural hazards Aburrá Valley. He has published in many international journals such including the Bull. of Engineering Geology and the Environment, JP of Human Security and Development, Zeitschrift für Geomorphology, Journal of the Institute of Housing INVI, Chile, and national journals including the Journal of the Academy Colombian Exact, Physical and Natural Sciences, and the Bulletin of Earth Sciences, Bulletin of routes, EAFIT Magazine, as well as in several books.