@inproceedings{VarraniCaviedesVoulliemeHinz, author = {Varrani, Arianna and Caviedes-Voulli{\`e}me, Daniel and Hinz, Christoph}, title = {Dynamic mapping of surface topografy at rainfall events}, series = {Proceedings of the 5th IAHR Europe Congress — New Challenges in Hydraulic Research and Engineering}, booktitle = {Proceedings of the 5th IAHR Europe Congress — New Challenges in Hydraulic Research and Engineering}, editor = {Armanini, Aronne and Nucci, Elena}, publisher = {IAHR Secretariat, Department of Civil, Environmental and Mechanical Engineering}, address = {Madrid, Spain}, isbn = {978-981-11-2731-1}, pages = {139 -- 140}, abstract = {Landscape evolution forced by rainfall is simulated at the laboratory scale and dynamically tracked using six virtual sensors Kinect™ to ensure detailed meas-urements with relatively low-cost devices.}, language = {en} } @misc{VarraniNonesGupana, author = {Varrani, Arianna and Nones, Michael and Gupana, Remika}, title = {Long-term modelling of fluvial systems at the watershed scale: Examples from three case studies}, series = {Journal of Hydrology}, volume = {574}, journal = {Journal of Hydrology}, issn = {0022-1694}, doi = {10.1016/j.jhydrol.2019.05.012}, pages = {1042 -- 1052}, abstract = {To date, many numerical approaches are available in studying water flow and sediment dynamics along rivers from the reach to the watershed scale, based on various simplifications. The aim of the present research is to demonstrate how the so-called "morphodynamic quasi-equilibrium hypothesis" is effective in modelling riverine landscape morphodynamics evolution at the watershed scale, focussing on the long-term changes of longitudinal profile and bed grainsize composition of large alluvial rivers. A lumped 0-D, two-reach, two-grainsize model based on the Local Uniform Flow hypothesis and originally developed for reproducing fluvial changes at the historical time-scale, has been applied to three large watercourses to reproduce their long-term evolution, performing a sensitivity analysis based on the present conditions. Three morphometric parameters were analysed, aiming to describe the evolution of the longitudinal profile (concavity and aggrading) and the grainsize composition of the river bed (fining). Though the 0-D approach does not allow for a spatial distribution of the input parameters, namely the liquid and solid discharge, the modelling outcomes show reasonably good qualitative trends. At the scale of analysis (centuries to millennia) and for the chosen large sedimentary systems (thousands of kilometres long), which show high inertia to geomorphological changes likely owing to their longitudinal scale, the model can be helpful in detecting where the present conditions reflect a big disturbance to the "natural" trend. This initial detection method can provide additional insights in evaluating the capability of actual rivers to respond to the present external forcing, eventually reaching a quasi-stable configuration.}, language = {en} } @misc{NonesVarraniFranzoiaetal., author = {Nones, Michael and Varrani, Arianna and Franzoia, Mariateresa and Di Silvio, Giampaolo}, title = {Assessing quasi-equilibrium fining and concavity of present rivers: A modelling approach}, series = {Catena}, volume = {181}, journal = {Catena}, issn = {0341-8162}, doi = {10.1016/j.catena.2019.104073}, pages = {15}, abstract = {The aim of the paper is presenting a very simple but reliable tool to reproduce the evolution of alluvial rivers worldwide, typically characterized by longitudinal profile concavity and downstream bottom fining. A zerodimensional, two-reach, two-grainsize hydro-morphological model has been developed to simulate the long-term evolution of alluvial watercourses up to the present state, starting from the basin orogeny. Firstly, the model is described and tested against six hypothetic cases to show the quasi-stationary behaviour of profile concavity and bottom fining. Then it is applied to four real watercourses having diverse size, hydrological and morphoclimatic characteristics: the Adige, Ob, Parana and Zambezi rivers. These are characterized by a different "age", indicated by the estimated time elapsed from the last significant tectonic episode in their basin, ranging from 10 to 300 million years for the four cases. For all the simulated rivers it has been confirmed a satisfactory replication by the model of the measured slopes and concavity of the longitudinal profile in the present conditions. Unfortunately, only a limited comparison of the computed sediment fining in the downstream direction was possible, as very few information on spatially-distributed measured grainsize composition along the studied river systems is available.}, language = {en} } @misc{VarraniNones, author = {Varrani, Arianna and Nones, Michael}, title = {Vulnerability impacts and assessment of climate change on Jakarta and Venice}, series = {International Journal of River Basin Management}, volume = {16}, journal = {International Journal of River Basin Management}, number = {4}, issn = {1814-2060}, doi = {10.1080/15715124.2017.1387125}, pages = {439 -- 447}, abstract = {In the next future, cities located in coastal areas are likely to suffer for climatic changes more than all other human systems. The demographic growth, combined with sea-level rise and global warming related to natural causes and anthropogenic activities, endanger those systems. Thence, to effectually cope with new climate forcing, coastal cities need improvements to be sustainable, resilient and liveable, applying flexible design approaches rather than a traditional one. The paper highlights such concepts presenting two case studies of important coastal cities: Venice, in Northern Italy, and Jakarta, the capital city of Indonesia. Although characterized by completely different climatic conditions and living habits, these two metropolises are highly impacted by humans and threatened by similar factors like subsidence and sea-level rise, which increase their exposure to future calamities principally driven by climate change but strictly related to anthropic pressures. The present situation shows that, for the future, the resilience of coastal megalopolis can be increased only using a mix of approaches at various levels, spanning from technical measures to adaptable planning instruments that consider future uncertainties.}, language = {en} }