Urbanization is a massive landscape artificialization, affecting both the social and the environmental dimensions. Floodplains are particularly concerned by urban deployment worldwide, yet the impacts of this phenomenon on their socio-ecosystems is not clearly known. The present project is part of GloUrb, a research program that aims to characterize the variability of floodplain and cities interactions around the world, so as to qualify the effects of urbanization on riverscapes, societies and ecosystems. This poster contribution will first present the objectives of the whole GloUrb program, and secondly focus on the riverscape characterization part, conducted through a PhD project. The objective is to characterize the changes in riverscape in time and space, under urbanization pressure. The study will start with the study of 300 urbanizing floodplains around the world, fed by existing databases, to have an image of the global tendencies and of the local particularities. 50 cities will then be selected to analyze more precisely the urbanization mechanisms altering the ecosystems and evaluate the impacts on ecosystem services. The poster will describe the project strategy to achieve its objectives, and its different steps, from data collection to communication towards practitioners. Then it will show some concrete examples of urban expansion effects in river corridors: river incision because of sediment extraction, channel linearization resulting from diking, changes in the water resources…