Climate change 2014 - Synthesis Report

With digital equipment becoming increasingly networked, either on wired or wireless networks, for personal and professional use alike, distributed software systems have become a crucial element in information and communications technologies. The study of these systems forms the core of the ARLES' work, which is specifically concerned with defining new system software architectures, based on the use of emerging networking technologies. In this context, we concentrate on the study of distributed systems which bring to life the vision of ubiquitous computing systems, also known as ambient intelligence.

반도체 공정 overview

Understanding, management and modelling of urban hydrology and its consequences for receiving waters: A state of the art

Part I presents the statistical theory of turbulence, and Part 2 the coherent structures in open-channel flows and boundary layers. The book is intended for advanced students and researchers in hydraulic research, fluid mechanics, environmental sciences and related disciplines. References Index.

Turbulence in open-channel flows

Artificial intelligence based models for stream-flow forecasting: 2000–2015

Resumen Para dar respuesta a los requerimientos en materia de aguas definidos en las directrices, reglamentos y recomendaciones existentes en la legislacion espanola, los cuales estan mayoritariamente basados en directivas europeas, se ha desarrollado una herramienta de modelizacion numerica del flujo de agua en lamina libre en 2 dimensiones. La herramienta, llamada Iber, combina un modulo hidrodinamico, un modulo de turbulencia y un modulo de transporte de sedimentos, y utiliza el metodo de volumenes finitos para resolver las ecuaciones correspondientes. Al modulo de calculo se le ha adaptado una interfaz que se basa en el software de preproceso y posproceso GiD, desarrollado por CIMNE. El resultado es una herramienta de modelizacion numerica del flujo de agua y sedimentos en rios y estuarios, que utiliza esquemas numericos avanzados especialmente estables y robustos en cualquier situacion pero especialmente adecuados para flujos discontinuos y, en concreto, para cauces torrenciales y regimenes irregulares.

Iber: herramienta de simulación numérica del flujo en ríos

The 3D instantaneous velocity recorded with an acoustic Doppler velocimeter (ADV) in a highly turbulent free surface flow is analysed using several filters in order to eliminate the corrupted data from the sample. The filters used include the minimum/maximum threshold, the acceleration threshold, and the phase-space threshold. Following some ideas of the phase-space filter, a new method based on the 3D velocity cross-correlation is proposed and tested. A way of computing the constants of the acceleration threshold method is proposed, so no parameters need to be fixed by the user, which makes the filtering process simpler, more objective and more efficient. All the samples analysed are highly turbulent. Nevertheless, the turbulence intensity and the air entrainment vary widely in the flow under study, which produces data records of different quality depending on the measurement point. The performance of the filtering methods when applied to samples of different quality, and the effects of the filtering process in the mean velocity, turbulent kinetic energy and frequency spectra are discussed.

Velocity measurements on highly turbulent free surface flow using ADV

Experimental validation of two-dimensional depth-averaged models for forecasting rainfall-runoff from precipitation data in urban areas

The performance of two particular designs of vertical slot fishways for two different slopes was studied in a wide range of discharges. Water depths were measured in almost the whole surface of pools. A linear relation between dimensionless discharge and depth of flow, and the same flow patterns for each design were found. With an acoustic Doppler velocimeter, three-dimensional velocities were measured at several levels in the entire pool to detect the structure of the flow and quantify velocity distribution. Two different regions in flow patterns were found: a direct flow region characterized by maximum velocities; and a recirculation region, defined by low velocities and horizontal eddies. For a given slope, the velocity at any point of the pool (particularly at the slot) may be considered independent of the discharge and constant with the depth. Some suggestions on kinetic turbulent energy are also made.

Experimental Approach to the Hydraulics of Vertical Slot Fishways

Depth averaged models are widely used in engineering practice in order to model environmental flows in river and coastal regions, as well as shallow flows in hydraulic structures This paper deals with depth averaged turbulence modelling The most important and widely used depth averaged turbulence models are reviewed and discussed, and a depth averaged algebraic stress model is presented A finite volume model for solving the depth averaged shallow water equations coupled with several turbulence models is described with special attention to the modelling of wet-dry fronts In order to asses the performance of the model, several flows are modelled and the numerical results are compared with experimental data

Jerónimo Puertas

Papers

Iber: herramienta de simulación numérica del flujo en ríos

Velocity measurements on highly turbulent free surface flow using ADV

Experimental validation of two-dimensional depth-averaged models for forecasting rainfall-runoff from precipitation data in urban areas

Experimental Approach to the Hydraulics of Vertical Slot Fishways

Depth Averaged Modelling of Turbulent Shallow Water Flow with Wet-Dry Fronts