Editorial: Hydrogeomorphology - a long-term scientific interface

Hydrogeomorphology is reframed as an old inter-discipline, which is still highly relevant to both hydrology and geomorphology, renewed by new techniques and new questions in line with challenges of ungauged basins; anthropogenic changes in driving forces, landscape structures, and dynamic functions; translation of science into practice; and retrospective and prospective analyses. The corpus and experience of hydrogeomorphology are also highlighted regarding new emerging sub- or inter-disciplines, in terms of epistemic bridging and dealing with complexity.