English Translation, Synonyms, Definitions and Usage Examples of Spanish Word 'masas de agua almacenada'. Adenda: trabajos necesarios para la mejora del conocimiento y protección contra la contaminación y el deterioro del estado de las masas de agua subterránea. Home > services > > WMS_Agua (MapServer) > Estado químico masas de agua subterránea PHC > query · Help | API Reference.


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Tesis en acceso abierto en: DIGIBUG Resumen Abstract Water motions in masas de agua and reservoirs are initiated as a result of thermal and mechanical energy flowing through the lake boundaries, cascading down from the large- basin scale to the micro-scales, and ultimately leading to mixing and dissipation.

Mixing patterns induced by basin-scale motions and high-frequency waves in masas de agua lakes are inherently patchy, setting up horizontal density variations.


It is through these horizontal motions that the system readjusts, returning to its equilibrium state with lines of equal density coinciding with geopotential surfaces. Horizontal density gradients have been shown to develop in response to a wide range of mechanisms with different spatial and temporal scales, including river inflows, thermal spatial variations response to surface heat masas de agua, uneven mixing masas de agua to basin scale motions, spatially varying surface wind mixing, upwelling or mixing in the benthic boundary layer.


Given masas de agua number of mechanisms leading to the development of baroclinic pressure gradients, and the wide range of spatio-temporal scales of these processes the problem of describing horizontal circulation in lakes and reservoirs has been masas de agua.

Only in the last few years, advances in remote sensing and quantitative imaging capable of retrieving surface velocity and temperature fields, and the use of three-dimensional 3D numerical models solving the equations of motion applied to simulate lake motions with sufficient temporal and spatial resolution has allowed aquatic scientists to describe and understand the complex horizontal circulation patterns that develop in lakes and reservoirs, leading to horizontal transport and heterogeneity.

Most of these models are based on the solution of three-dimensional form of the shallow-water equations 3D-SWE, a simplified form of the Reynolds averaged Navier-Stokes RANS equations, subject to the appropriate boundary conditions.

Practical computational limits and a priori scaling analyses justify the use of the 3D-SWE in the description of these large-scale flows. But, even if using 3-D SWE models, engineers and scientists still face a serious challenge when trying to simulate horizontal transport and circulation in the near-shore environments of large water bodies.

These are hot-spots in the aquatic ecosystems with large biodiversity and critical habitats for many organisms in lakes. But, masas de agua the nexus of human interactions with lakes, littoral habitats are highly modified by human uses.


Humans build structures, recreate, fish, extract water, or dispose sewage at lake edges. Significant inputs of nutrients also arrive to masas de agua coastal zone through rivers, as a result of agricultural practices or cattle-raising in the contributing watershed.

Hence, there is masas de agua increasing need to understand near-shore environments where human uses and natural wild-live compete for resources. Simulating these environments, however, is not simple. Littoral habitats can be substantially heterogeneous in both vertical and horizontal dimensions.

Moreover, physical conditions exhibit continuous and very dynamic changes, at short-time scales, as a result of strong hydrodynamic forcing and the weak inertia of shallow layers, and also as a result of the time varying nature of human activities.

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masas de agua Furthermore, near-shore regions, though, cannot be understood in isolation from the pelagic. Hence, in trying to simulate the near-shore physical conditions both local and basin-scale circulation features need to be resolved simultaneously during long periods of time, and the computational cost of these simulations can be formidable.

Parallel computation platforms are being increasingly demanded and used in the area of Civil and Environmental Engineering, and others research areas, to reduce the computational time required to conduct numerical simulations of real systems, or deal with even larger problems.

In this dissertation a series of solutions are proposed and tested to reduce the computational cost of 3D hydrodynamic models, so that simulations of water motion and transport in near-shore regions of large geophysical systems, during extended periods of time and using high resolution grids, can be conducted with acceptable execution time and using masas de agua resources.

Several approaches are introduced and studied. First, we explore nesting-procedures in which only localized regions of the littoral zone are simulated using a very high-resolution or inner-model, with masas de agua conditions which are provided by an outer-model that solves the large-scale processes in the rest of the water body.

Second, we use parallel computation techniques so that use can be made of mid-range or low-cost platforms to run the inner and outer models simultaneously.

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We also optimize and parallelize the model computations used in small commodity clusters, dividing the calculations in the near-shore regions among a large number of processors, as they become available in parallel platforms. The resulting optimized and parallelized model of near-shore regions scales almost linearly, so that the masas de agua model is run faster as more resources are masas de agua.

We have additionally taken additional steps to adapt the hydrodynamic model to the architecture and tools available. With this work, we demonstrate that the adaptation and optimization of the model to the available resources can also be used to reduce significantly the computational cost, with very good scalability results even using High performance platforms.

The implementation was carried out on a particular 3D-SWE, which was originally implemented for serial architectures by P. Smith Figure a. Most improvements proposed here, though, can be applicable to other similar models.