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Report La cruna dell'ago ; 10 apr La cruna dell'ago. Salute Autori: Giulio Valesini Scarica il PDF Il cammello nella cruna dell'ago Filippo M Leonardi Entra ora e comincia la lettura! Laureatosi in Narrativa - Libri nuovi e usati su Libraccio.
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Romanzo d Autore Franz Autore Ken Follett ,. Scarica la Brochure ; Utilizzare sempre la placca d'ago corretta. Fate in modo che dalla cruna dell'ago escano cm circa. Il cammello e la cruna dell'ago due anni dopo. Secondly, the results predict the most likely forthcoming evolution of the present flooding of the Meirama open pit to reach therein a total depth level of almost m, as regards the projected evolution of the water resources, climatology and usages.
Figures - uploaded by Horacio Hernandez. Author content All content in this area was uploaded by Horacio Hernandez. WT is the water table, and ETa is the actual evapotranspiration. Root water uptake model transpiration curves. Mean percentage of error relative to the maximum observed value. Equivalent storage and transmissibility.
Content uploaded by Horacio Hernandez. Author content All content in this area was uploaded by Horacio Hernandez on Jan 10, This research and practical application is concerned with the development of a physically-based numer-.
Information Systems to store, represent, manage and take decisions on all the simulated conditions. The proposed surface—subsurface model considers surface and groundwater interactions to be depth-. Surface—groundwater interactions consider also novel evaporation and.
Firstly, the model was adapted and calibrated during a simulation period of three and a half. All rights reserved. Nowadays, there is an increasing need for integrated surface. The philosophy and role. Recent methodologies were also developed on combined. Several process-based numerical models for the simulation of. Examples include Gunduz and Aral , who focused on.
Standard features of detailed process-based hydrological. Corresponding author. E-mail addresses: Vellando , afernan-. Contents lists available at SciVerse ScienceDirect. These characteristics will not be described in any case here; this. French which considers novel modelling features of the joint sur-. Padilla et al.
The model considers surface and groundwater interactions to. Surface—groundwater interactions consider also new evaporation. Nowadays, geographically distributed data are commonly man-. In this respect,. Therefore, this research deals with the numerical developments. The model behavior is checked,. In order to establish the appropriate transient partial differen-. Huyakorn et al. The conceptual model of root water uptake transpiration curves.
As can be seen, the actual evapotranspiration ET a is evaluated. The root water uptake model transpiration curve starts when. Thus, phreatic evaporation, E. The second part of the transpiration curve starts increasing. WT is the water. In this region the. The last part of the transpiration curve starts when the WT is. The ET a curve is gradually restricted between total. The transpiration behavior in this zone is.
The root water uptake model has important advantages. One of.
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In particular, as often hap-. Consequently, following the Muskingum. With respect to this, the continuity equation for the channel. Therefore, the time dimensioned K parameter can be regarded. Substituting this last one in the Muskingum equation yields. X being non-dimensional.
Which is interpreted as the vertical variation of the mean hori-. Otherwise X is non-dimensional, but must take a value. The original Muskingum equation can now be interpreted as:. Therefore, from this, it can be assumed that:. Therefore q, which depends also on the horizontal hydraulic. This means that there is no need for mathematical. With respect to this, the present numerical characterization of. Similar to other techniques.
Nowadays, the concept of K. Langhans et al. Thus, the rate. Taking surface—groundwater interactions into account, in par-. On the basis of this. On this context, for instance, the apparent storage. On the other hand,. The depth averaging of all types of groundwater and surface. In particular, triangular elements of three nodes allow for the. The preconditioned iterative. There is no. This is a clear advantage because the lumping properties allow for.
Hydraulic heads and gradients are depth-averaged. Then the model. Djokic, Thereafter watershed study area is imple-. Nodal properties are. Then, pumping wells, cross sections discharges, surface water. A database, with measured or acquired data, is related with the. Since coal mining in Meirama mine had been exploited by. Lignitos of Meirama, S. The environmental plan of closure has.
The presently forming pit lake of Meirama is to lie on the. The climate in this area is typically Atlantic with an annual rain-. To this respect, the catchment. Trends with a period longer than one year. Thereafter, prospec-. During the last exploitation period June —March the.
To prevent the surface water getting into the pit, the streams were. Other water. Registries of piezometers and pumping levels, owned by. The purpose is to avoid the. Location of surface water discharge measurements. Geology of the catchment materials. Location of piezometers and pumping wells selected for calibration purposes. The location of. With respect to the geological aspects, there are three main re-.
For these mate-. Thus, the simulation strategy. During the calibration period, the simulated. March, most of the existing wells stopped pumping.
During the validation period, the simulated conditions considers. During the pre-. In order to properly proceed with the calibration of the hydro-.
Nevertheless, the instrumenta-. In this respect, two different zones can be distinguished in the. However, this last zone could not be continuously and. In this context, the calibration of the hydrological parameters.
Then, the aim is to predict the forthcoming evolution of the. The results of the model application to the whole of the water. A trial and error method was employed to estimate the model. In this respect. These results are summarized in. The results of calibration give major effective porosities, 1. Table 1. The wide range of conductivities. Nevertheless, the hydraulic anisotropy of. The comparison of ob-. In addition to the low sensitivity observed in these. These piezometers follow the limits be-.
With respect to the results of the simulated pumping wells W1. However a high variability is observed in hydraulic heads simu-. Langhans, C. Experimental rainfall—runoff data: Li, K. An exponential root-water-uptake model. Soil Sci.
Li, H. Maidment, D. Hydrologic and Hydraulic Modeling Support with. Geographic Information System. Nyambayo, V. Numerical simulation of evapotranspiration. Padilla, F. Modeling seawater intrusion with open. Ground Water 35 4 , — Numerical modelling of.
Ross, M. A new discretization scheme. Hromadka, T. Integrated Water Resources Management. American Institute of Hydrology, Las. Saad, Y. SIAM J. Sophocleous, M. Methodology and application of combined. Stone, J. ASABE 51 1 , 45— Tung, Y. Weill, S. Yu, B. Plot-scale rainfall—runoff.
Citations References Several numerical models have been developed to predict the groundwater inflow to open pit mines and to predict the hydraulic head in observation wells at different distances from the centre of the pit e. Aryafar et al. Bahrami et al. The model calculates transient hydraulic head and a transient free surface in a 2D, heterogeneous domain, with variable and transient boundary conditions.
It includes infiltration, evapotranspiration and surface water flow together with the water and contaminant fluxes across the aquifer-wetland interface. Application of artificial neural network coupled with genetic algorithm and simulated annealing to solve groundwater inflow problem to an advancing open pit mine. Saeed Bahrami. In this study, hybrid models are designed to predict groundwater inflow to an advancing open pit mine and the hydraulic head HH in observation wells at different distances from the centre of the pit during its advance.
Ratios of depth of pit penetration in aquifer to aquifer thickness, pit bottom radius to its top radius, inverse of pit advance time and the HH in the observation wells to the distance of observation wells from the centre of the pit were used as inputs to the networks. In addition, by switching the last argument of the input layer with the argument of the output layer of two earlier models, two new models were developed to predict the HH in the observation wells for the period of the mining process.
Predicted results obtained by the hybrid methods are closer to the field data compared to the outputs of analytical and simple ANN models. In this sense, this numerical approach Fig.
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It can also consider other water components such as the evapotranspiration processes, that is, a diffusive discharge from surface water and soils within the unsaturated zone by a root water uptake sub-model, as well as the overland flow by a rainfall-runoff sub-model based on an exponential method for assessing the infiltration rates .
The regulation capacities of diversion works may be considered for withdrawing and bypassing certain flow rates of water from a river bed towards other places, by transferring them mainly through impervious channels, pipelines or tunnels.
Full-text available. Dec Infiltration rates as well as overland flows generation processes are assessed by the concerned sub-models. Therefore, this research deals with the numerical developments being required to consider new practical applications of this finite elements solution, in particular those concerned with water uses and management of surface water, through the water flow control of the capacity of diversion works on river beds, spillways and outflow operations of floodgates in weirs and dams of reservoirs.
Application of a numerical model designed for integrated watershed management. Jul The proposed model considers surface and groundwater interactions to be 2-D horizontally distributed and depthaveraged through a diffusive wave approach. Infiltration rates, overland flows and evapotranspiration processes are considered by diffuse discharge from surface water, non-saturated subsoil and groundwater table.
Recent developments also allow for the management of surface water flow control through the capacity of diversion on river beds, spillways and outflow operations of floodgates in weirs and dams of reservoirs. The application regards the actual hydrology of the Mero River watershed, with two important water bodies mainly concerned with the water resources management at the Cecebre Reservoir and the present flooding of a deep coal mining excavation. The results presented predict the likely evolution of the Cecebre Reservoir, the flow rates in rivers and the flooding of the Meirama open pit.
Prediction of Groundwater Inflow into an Iron Mine: Mar Management of large quantities of water from a mine site is generally considered in the initial mine plan, but has to be refined as mining progresses. Evaluating and forecasting groundwater ingress to a mine are necessary. Groundwater flows into the mine site during eight periods, from the fourth year to the projected end of mining, were forecasted by the numerical model. Comparing the modeling result with actual observations showed that the forecast modeling result was 4.
Therefore, the hydrogeological conditions and selected parameters in the model appear reasonable. The present model incorporates some efficient tools that evaluate the natural conditions of the water catchments including an evaluation of the free water flow based on the continuity of mass. The resulting model does not include the verification of the continuity of momentum nor a turbulence model, but still provides a proper overall assessment of the flow in the watershed, that can be refined with a further turbulent assessment of the free surface flow.
The model has been verified through its comparison with some benchmark problems showing to be both accurate and numerically efficient. Apr Ricardo Juncosa Rivera. From a geological point of view, the territory belongs to the Hercynian chain and, more specifically, to a large outcrop dominated by igneous and metamorphic rocks called the Hesperian Massif or Iberian Massif. In some sectors the Hesperian Massif is partially covered by more recent sedimentary deposits.
The geology of Galicia is very complex due to the age of the rocks that make up its substrate and their diversity. Thus, the hydrogeological behaviour of the underground medium hydrodynamic and hydrogeochemical characteristics will determine the therapeutic properties of the water emanating from the surface. In Galicia, aquifers are generally shallow with low mineralization, except for those whose waters come from deep fractured mediums.
The chemical characteristics of the water are directly related to the geological matrix. The groundwater flows through the geological medium and is mineralogically enriched by heterogeneous chemical reactions. Galicia turns out to be an area rich in the potential exploitation, applications and use of different water resources. These resources are thermal, mineral-natural and mineral-medicinal waters.
In this work, we have developed a study that relates the geology, hydrogeological and hydrogeochemical characteristics of the Galician substrate and their potential therapeutic indications. To achieve that, we have chosen to study the exploited waters with higher flow rates, including the natural mineral waters for human use. Conference Paper. Oct Al principio, el suministro de agua fue para garantizar principalmente el consumo humano.
Modelling integrated extreme hydrology. Aug The proposed model considers surface and groundwater interactions to be 2-D horizontally distributed and depth-averaged through a diffusive wave approach. Infiltration rates, overland flows and evapotranspiration processes are considered by diffuse discharge from surface water, unsaturated subsoil and groundwater table. New improvements also allow for the management of surface water flow control through the capacity of diversion on flooding zones of catchment areas, as well as on river beds, spillways and outflow operations of floodgates in weirs and dams of reservoirs.
The numerical model was adapted to the wastewater and sludge properties of both sudden spillages, as well as to the river bed, the flooded zones and the underneath alluvial aquifer.
The model simulation and calibration were made during the date of this hydrological hazard to the likely discharges and dual hydrograph produced by the sudden twofold failure of both reservoirs. Nov We analysed the hydrochemistry and the Mero River basin regulations to determine whether the water quantity and quality could meet the needs during periods of increased demand and drought, and still satisfy ecological conditions required by law.
Our results indicated that joint use of the two reservoirs is feasible. The local administration is implementing the recommendations by building a tunnel to tap into the pit lake.
Agents-based modelling for hydrological surface processes on a small watershed Layon, France. Show more. A new discretization scheme for integrated surface and groundwater modeling. Hydrological science and technology. Jan Macroscopic root-water-extraction models often do not adequately account for the non-uniform distribution of roots in the soil profile.
We developed an exponential root-water-uptake model, which was derived from a measured root density distribution function. The model, incorporated in the Soil-Water-Atmosphere-Plant SWAP simulation model, was tested on a clay loam soil cropped to soybeans and on a sandy loam soil cropped to corn, near Ottawa. Comparisons of measured and simulated soil water contents with the exponential model, a linear depth-dependent model and a constant-extraction-rate model were also made.
The constant-extraction-rate model overestimated the soil water contents in the upper part of the soil profile maximum error 0. The exponential model and the linear model performed fairly similarly at the lower depths, but the exponential model gave better results in the near-surface horizons.
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The exponential model was sensitive to the root distribution coefficient and to the rooting depth, when the latter was approximately less than 40 cm. The results of this study suggest that the exponential root-water-uptake model as incorporated in SWAP is an improvement over those models, which do not account for the root distribution in the soil. Plot-scale rainfall runoff characteristics and modelling at six sites in Australia and South East Asia. Sep During major runoff events when most soil loss occurs, runoff is likely to dominate the rainfall-driven erosion processes.
Thus accurate estimation of the runoff rate is critical to soil loss predictions. At plot scale, the Green-Ampt infiltration model is commonly assumed to be able to describe the temporal variation of the infiltration rate over a storm event.
Field measurements of both rainfall intensity and runoff rate at 1-min intervals at six sites in the tropical and subtropical regions of Australia and Southeast Asia, however, strongly suggest that the apparent infiltration rate is closely related to the rainfall intensity and it is essentially independent of the cumulative infiltration amount, features not accord with the Green-Ampt infiltration equation.
Furthermore, the storage effect and runoff rate attenuation are not negligible at the plot scale. With an initial infiltration amount to determine when runoff begins, an exponential distribution to describe the spatial variation in the maximum infiltration rate and a linear storage formulation to model the lag between runoff and rainfall, we were able to develop a satisfactory three-parameter model for the runoff rate at 1-min intervals within a storm event.
Peter S. A sharp interface numerical model is developed to simulate saltwater intrusion in multilayered coastal aquifer systems. The model takes into account the flow dynamics of salt water and fresh water assuming a sharp interface between the two liquids. In contrast to previous two-fluid flow models which were formulated using the hydraulic heads of fresh water and salt water as the dependent variables, the present model employs a mixed formulation having one fluid potential and a pseudosaturation as the dual dependent variables.
Conversion of the usual sharp interface flow equations for each aquifer to an equivalent set of two-phase flow equations leads to the definitions of pseudosaturation, capillary pressure, and constitutive relations. The desired governing equations are then obtained by connecting neighboring aquifers via vertical leakage. The proposed formulation is based on a Galerkin finite element discretization.
The numerical solution incorporates upstream weighting and nonlinear algorithms with several enhanced features, including rigorous treatment of aquitard leakage and well conditions, and a robust Newton-Raphson procedure with automatic time stepping. The present sharp interface numerical model is verified using three test problems involving unconfined, confined, and multilayered aquifer systems and consideration of steady state and transient flow situations.
Comparisons of numerical and analytical solutions indicate that the numerical schemes are efficient and accurate in tracking the location, lateral movement, and upconing of the freshwater-saltwater interface.