Incisión, erosión transitoria y formas de fondo en los tramos medio y bajo del río Tordera

[ES] Se presenta en este trabajo los datos de campo y análisis que prueban el comportamiento dinámico del río Tordera. El aspecto más llamativo es el descenso general (incisión) del cauce del río, del orden de 3m y a lo largo de unos 15 km, en los últimos 40 años. Se muestra con datos de campo que la erosión general transitoria del cauce arenoso puede ser del orden de metros y que el lecho presenta grandes dunas.Martín Vide, JP.; Batalla, RJ.; Roca I Collell, M.; Rovira, A.; Andreatta, A. (2005). Incisión, erosión transitoria y formas de fondo en los tramos medio y bajo del río Tordera. Ingeniería del agua. 12(1):53-62. https://doi.org/10.4995/ia.2005.2551OJS5362121Ackers, P., White, W.R., Perkins, J.A., Harrison, J.M. (1978) "Weirs and flumes for flow measurement". John Wiley and sons, Chichester.Batalla, R.J. (1997): "Evaluating bed-material transport equations using field measurements in a sandy gravel-bed stream (Arbúcies, NE Spain)". Earth Surface Processes and Landforms, 22, 2, 121-130Batalla, R.J. Martín-Vide, J.P. (2001) "Thresholds of particle entrainment in a poorly sorted sandy gravel-bed river". Catena 44, 223-243Batalla, R.J., Sala, M., Werrity, A. (1995): "Sediment budget focused on solid material transport in a subhumid Mediterranean drainage basin". Zeitschrift für Geomorphologie, 29, 2, 249-264Church, M.A., McLean, D.G. & Wolcott, J.F. (1987): "River bed gravels: sampling and analysis". A: Thorne, C.R., Barthurst, J.C. & Hey, R.D. (eds.): Sediment transport in gravel-bed rivers. John Wiley & Sons, 43-88Garde, R.J., Ranga Raju, K.G (1977) "Mechanics of sediment transportation and alluvial stream problems". John Wiley and sons, New York 1977.Gutiérrez, C. (1999) "La Tordera. Perspectiva geograficohistòrica d'un riu". Publicacions de la rectoria vella. Sant Celoni.Leopold, L.B., Wolman, M.G., Miller, J.P. (1964) "Fluvial proceses in geomorphology". Dover Publications, New York.Martín Vide, J.P. (2002) "Ingeniería fluvial". Edicions UPC, Barcelona 1997 e "Ingeniería de ríos", Edicions UPC, Barcelona 2002.Pedraza, P. (1998) "Estudio de la erosión general en el río Tordera". Tesina de especialidad, Escuela T.S. de Ing. de Caminos, UPC.Rovira, A. (2001) "Balanç de sediment i dinàmica fluvial en un riu de règim hidrològic transitori (tram final de la Tordera)". Tesi Doctoral, Universitat de Barcelona.Sala, M. (1978) "La cuenca del Tordera. Estudio geomorfológico". Tesis doctoral. Universitat de Barcelona.Schreider, M., Scacchi, G., Franco, F., Fuentes, R., Moreno, Ch. (2001) "Aplicación del método de Lischtvan y Lebediev al cálculo de la erosión general". Ingeniería hidráulica en México, XVI,1, pp.15-25.Wolman, M.G. (1954) "A method of sampling coarse bed-material". American Geophys. Union Trans., 35, 951-956

Cooperación en el desarrollo de sistema de previsión de alerta de inundaciones

Postprint (published version

Cooperación en el desarrollo de sistema de previsión de alerta de inundaciones

Postprint (published version

Liquid−Liquid Equilibrium in Mixtures Containing Propane-1,2,3-triol and Mixtures Containing Vegetable Oils at Atmospheric Pressure

Mutual solubility of propane-1,2,3-triol with pentane, hexane, heptane, or ethyl acetate and mutual solubility between different vegetable oils (sunflower oil, soybean oil, corn oil, and olive oil) with methanol or ethanol have been reported at temperatures ranging from (298.2 to 348.2) K and atmospheric pressure. Furthermore, the binodal curves for ethyl acetate + methanol or ethanol + propane-1,2,3-triol at (303.2, 313.2, and 323.2) K have been explored. A higher solubility has been found in the system containing ethanol than the system containing methanol. The GCA-EoS model has been used to represent these mixtures. The distribution coefficient of alcohol and the selectivity of propane-1,2,3- triol in the ternary mixture of ethyl acetate + methanol or ethanol + propane-1,2,3- triol have been evaluated by GCA-EoS model. These results indicate a more effective use of propane-1,2,3-triol as separation agent by liquid−liquid extraction in the binary mixture of ethyl acetate + methanol than ethyl acetate + ethanol. On the other hand, regarding the mixtures containing vegetable oil, the mutual solubility of alcohol in the phase rich in vegetable oil is bigger than the mutual solubility of vegetable oil in the phase rich in alcohol.Fil: Andreatta, Alfonsina Ester. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnol.conicet - Bahia Blanca. Planta Piloto de Ingenieria Quimica (i). Grupo Vinculado Al Plapiqui - Inv. y Desarrollo En Tecnologia Quimica; Argentina. Universidad Nacional de Córdoba; Argentina. Universidad Tecnologica Nacional. Facultad Reg.san Francisco; ArgentinaFil: Arposio, Andrés . Universidad Tecnologica Nacional. Facultad Reg.san Francisco; Argentin

SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

Background: Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods: The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18-49, 50-69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results: NNVs were more favourable in surgical patients than the general population. The most favourable NNVs were in patients aged 70 years or more needing cancer surgery (351; best case 196, worst case 816) or non-cancer surgery (733; best case 407, worst case 1664). Both exceeded the NNV in the general population (1840; best case 1196, worst case 3066). NNVs for surgical patients remained favourable at a range of SARS-CoV-2 incidence rates in sensitivity analysis modelling. Globally, prioritizing preoperative vaccination of patients needing elective surgery ahead of the general population could prevent an additional 58 687 (best case 115 007, worst case 20 177) COVID-19-related deaths in 1 year. Conclusion: As global roll out of SARS-CoV-2 vaccination proceeds, patients needing elective surgery should be prioritized ahead of the general population