Browsing by Author "Mao, Luca"
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- ItemA 2D hydrodynamic-sedimentological model for gravel bed rivers. Part II, Case study: The Brenta River in Italy(2013) Kaless, Gabriel; Moretto, Johnny; Delai, Fabio; Mao, Luca; Lenzi, Mario A.A 2D depth average model has been used to simulate water and sediment flow in the Brenta River so as to interpret channel changes and to assess model predictive capabilities. The Brenta River is a gravel bed river located in Northern Italy. The study reach is 1400 long and has a mean slope of 0.0056. High resolution digital terrain models has been produced combining laser imaging detection and ranging data with colour bathymetry techniques. Extensive field sedimentological surveys have been also carried out for surface and subsurface material. The data were loaded in the model and the passage of a high intense flood (R.I. > 9 years) was simulated. The model was run under the hypothesis of a substantial equilibrium between sediment input and transport capacity. In this way, the model results were considered as a reference condition, and the potential trend of the reach was assessed. Low-frequency floods (R.I. » 1.5 years) are expected to produce negligible changes in the channel while high floods may focalize erosion on banks instead than on channel bed. Furthermore, the model predicts well the location of erosion and siltation areas and the results promote its application to other reaches of the Brenta River in order to assess their stability and medium-term evolution.
- ItemA 2D hydrodynamic-sedimentological model for gravel-bed rivers. Part I: Theory and validation(2013) Kaless, Gabriel; Lenzi, Mario A.; Mao, LucaThis paper presents a novel 2D-depth average model especially developed for gravel-bed rivers, named Lican-Leufú (Lican=pebble and Leufu=river, in Mapuche’s language, the native inhabitants of Central Patagonia, Argentina). The model consists of three components: a hydrodynamic, a sedimentological, and a morphological model. The flow of water is described by the depth-averaged Reynolds equations for unsteady, free-surface, shallow water flows. It includes the standard k-e model for turbulence closure. Sediment transport can be divided in different size classes (sand-gravel mixture) and the equilibrium approach is used for Exner’s equation. The amour layer is also included in the structure of the model and the surface grain size distribution is also allowed to evolve. The model simulates bank slides that enable channel widening. Models predictions were tested against a flume experiment where a static armour layer was developed under conditions of sediment starvations and general good agreements were found: the model predicted adequately the sediment transport, grain size of transported material, final armour grain size distribution and bed elevation.
- ItemA flume experiment on wood storage and remobilization in braided river systems(2014) Bertoldi, Walter; Welber, Matilde; Mao, Luca; Zanella, Sandra; Comiti, Francesco
- ItemAn integrated analysis of the March 2015 Atacama floods(2016) Otárola, S.; Castro L.; Gironás León, Jorge Alfredo; Cienfuegos Carrasco, Rodrigo Alberto; Mao, Luca; Wilcox A.; Escauriaza Mesa, Cristián Rodrigo; Agredano, Roberto; Mignot E.; Zuazo V.; CEDEUS (Chile)
- ItemAssessing the effect of fish size on species distribution model performance in southern Chilean rivers(2019) Zamorano, D.; Labra, F.A.; Villarroel, M.; Lacy, S.; Mao, Luca; Olivares, M.A.; Peredo Parada, M.
- ItemBed material transport estimate in large gravel-bed rivers using the virtual velocity approach(2017) Mao, Luca; Picco, L.; Lenzi, M.; Surian, N.
- ItemBedload hysteresis in a glacier-fed mountain river(2014) Mao, Luca; Dell'Agnese, A.; Huincache Cárcamo, Carolina Marlene; Penna, D.; Engel, M.; Niedrist, G.; Comiti, F.
- ItemBedload transport in a formerly glaciated mountain catchment constrained by particle tracking(2015) Dell'Agnese, A.; Brardinoni, F.; Toro, M.; Mao, Luca; Engel, M.; Comiti, F.
- ItemBrief communication : The curious case of the large wood-laden flow event in the Pocuro stream (Chile)(2017) Ravazzolo, Diego; Mao, Luca; Mazzorana, Bruno; Ruiz-Villanueva, Virginia
- ItemChannel adjustments and island dynamics in the Brenta river (Italy) over the last 30 years(2014) Moretto, J.; Rigon, E.; Mao, Luca; Picco, L.; Delai, F.; Lenzi, M. A.
- ItemCharacterising physical habitats and fluvial hydromorphology: A new system for the survey and classification of river geomorphic units(2017) Belletti, Barbara; Rinaldi, Massimo; Bussettini, Martina; Comiti, Francesco; Gurnell, Angela M.; Mao, Luca; Nardi, Laura; Vezza, Paolo
- ItemCharacterization of wood-laden flows in rivers(2019) Ruiz Villanueva, Virginia; Mazzorana, Bruno; Blade, Ernest; Burkli, Livia; Iribarren Anacon, Pablo; Mao, Luca; Nakamura, Futoshi; Ravazzolo, Diego; Rickenmann, Dieter; Sanz Ramos, Marcos; Stoffel, Markus; Wohl, Ellen
- ItemClimate-scale modelling of suspended sediment load in an Alpine catchment debris flow (Rio Cordon-northeastern Italy)(2018) Diodato, Nazzareno; Mao, Luca; Borrelli, Pasquale; Panagos, Panos; Fiorillo, Francesco; Bellocchi, Gianni
- ItemCoarse sediment transfer and geomorphic changes in an alpine headwater stream(2021) Oss Cazzador, D.; Rainato, R.; Mao, Luca; Martini, L.; Picco, L.
- ItemControls Over Particle Motion and Resting Times of Coarse Bed Load Transport in a Glacier-Fed Mountain Stream(2020) Mao, Luca; Toro, M.; Carrillo Muñoz, Ricardo; Brardinoni, F.; Fraccarollo, L.
- ItemCoupling Climate Conditions, Sediment Sources and Sediment Transport in an Alpine Basin(2018) Rainato, Riccardo; Picco, Lorenzo; Cavalli, Marco; Mao, Luca; Neverman, Andrew J.; Tarolli, Paolo
- ItemCoupling Sediment Transport Dynamics with Sediment and Discharge Sources in a Glacial Andean Basin(2020) Carrillo, Ricardo; Mao, LucaSuspended and bedload transport dynamics on rivers draining glacierized basins depend on complex processes of runoff generation together with the degree of sediment connectivity and coupling at the basin scale. This paper presents a recent dataset of sediment transport in the Estero Morales, a 27 km(2) glacier-fed basin in Chile where suspended sediment concentration (SSC) and bedload (BL) fluxes have been continuously monitored during two ablation seasons (2014-2015 and 2015-1016). The relationship between discharge and SSC depends on the origin of runoff, which is higher during glacier melting, although the hysteresis index reveals that sediment sources are closer to the outlet during snowmelt. As for suspended sediment transport, bedload availability and yield depend on the origin of runoff. Bedload yield and bedload transport efficiency are higher during the glacier melting period in the first ablations season due to a high coupling to the proglacial area after the snowmelt period. Instead, on the second ablation seasons the peak of bedload yield and bedload transport efficiency occur in the snowmelt period, due to a better coupling of the lower part of the basin caused by a longer permanency of snow. Differences in volumes of transported sediments between the two seasons reveal contrasting mechanisms in the coupling dynamic of the sediment cascade, due to progressive changes of type and location of the main sources of runoff and sediments in this glacierized basin. The paper highlights the importance of studying these trends, as with retreating glaciers basins are likely producing less sediments after the "peak flow", with long-term consequences on the ecology and geomorphology of rivers downstream.
- ItemEco-morphological effects of large wood in mountain basins, under different level of forest management(2018) Ugalde Pascual, Fernando Javier; Mao, Luca; Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
- ItemField and Numerical Investigation of Transport Mechanisms in a Surface Storage Zone(2019) Sandoval Ulloa, Jorge Cristóbal; Mignot, Emmanuel; Mao, Luca; Pastén González, Pablo Arturo; Bolster, Dioogo; Escauriaza Mesa, Cristián Rodrigo; CEDEUS (Chile)
- ItemFlume and field-based calibration of surrogate sensors for monitoring bedload transport(2016) Mao, Luca; Carrillo, R.; Escauriaza Mesa, Cristián Rodrigo; Iroume, A.