TY - CHAP A1 - Varrani, Arianna A1 - Caviedes-Voullième, Daniel A1 - Hinz, Christoph ED - Armanini, Aronne ED - Nucci, Elena T1 - Dynamic mapping of surface topografy at rainfall events T2 - Proceedings of the 5th IAHR Europe Congress — New Challenges in Hydraulic Research and Engineering N2 - 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. Y1 - 2018 UR - http://rpsonline.com.sg/rps2prod/iahr2018/html/213.xml SN - 978-981-11-2731-1 SP - 139 EP - 140 PB - IAHR Secretariat, Department of Civil, Environmental and Mechanical Engineering CY - Madrid, Spain ER - TY - GEN A1 - Varrani, Arianna A1 - Nones, Michael A1 - Gupana, Remika T1 - Long-term modelling of fluvial systems at the watershed scale: Examples from three case studies T2 - Journal of Hydrology N2 - 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. KW - 0-D model KW - Riverbed aggrading KW - Riverbed fining KW - Congo River KW - Large rivers KW - Mississippi River KW - Morphodynamic equilibrium KW - Orinoco River KW - River concavity Y1 - 2019 U6 - https://doi.org/10.1016/j.jhydrol.2019.05.012 SN - 0022-1694 VL - 574 SP - 1042 EP - 1052 ER - TY - GEN A1 - Nones, Michael A1 - Varrani, Arianna A1 - Franzoia, Mariateresa A1 - Di Silvio, Giampaolo T1 - Assessing quasi-equilibrium fining and concavity of present rivers: A modelling approach T2 - Catena N2 - 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. KW - Alluvial large rivers KW - Bottom fining KW - Long-term evolution KW - Profile concavity KW - Zero-dimensional model Y1 - 2019 U6 - https://doi.org/10.1016/j.catena.2019.104073 SN - 0341-8162 VL - 181 ER - TY - GEN A1 - Varrani, Arianna A1 - Nones, Michael T1 - Vulnerability impacts and assessment of climate change on Jakarta and Venice T2 - International Journal of River Basin Management N2 - 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. KW - City resilience KW - climate change adaptation KW - flood risk management KW - Jakarta KW - urban planning KW - Venice Y1 - 2018 U6 - https://doi.org/10.1080/15715124.2017.1387125 SN - 1814-2060 SN - 1571-5124 VL - 16 IS - 4 SP - 439 EP - 447 ER -