17 results match your criteria Advances In Water Resources[Journal]

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Analysis of the current world biofuel production under a water-food-energy nexus perspective.

Adv Water Resour 2018 Nov;121:22-31

Politecnico di Milano, Dipartimento di Ingegneria Civile ed Ambientale, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.

This paper assesses the sustainability of bioenergy production under a nexus perspective through a new efficiency type index. The index describes 1st generation biofuel production under the perspective of the implied consumption of natural resources. We consider the sustainability of energy production as a sequence of steps, each characterised by its efficiency, and propose an index which returns an overall efficiency value describing the adequacy or inadequacy of the considered processes under a nexus perspective. Read More

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http://dx.doi.org/10.1016/j.advwatres.2018.07.007DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358151PMC
November 2018

Evaluating drywells for stormwater management and enhanced aquifer recharge.

Adv Water Resour 2018 Jun;116:167-177

Systems Exposure Division, National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Los Angeles, CA, United States.

Drywells are increasingly used for stormwater management and enhanced aquifer recharge, but only limited research has quantitatively determined the performance of drywells. Numerical and field scale experiments were, therefore, conducted to improve our understanding and ability to characterize the drywell behavior. In particular, HYDRUS (2D/3D) was modified to simulate transient head boundary conditions for the complex geometry of the Maxwell Type IV drywell; i. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S03091708173110
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http://dx.doi.org/10.1016/j.advwatres.2018.04.003DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145462PMC
June 2018
6 Reads

River networks as ecological corridors: A coherent ecohydrological perspective.

Adv Water Resour 2018 Feb;112:27-58

Department of Ocean Engineering, Department of Civil Engineering and Department of Biological and Agricultural Engineering, Texas A & M University, College Station (TX), USA.

This paper draws together several lines of argument to suggest that an ecohydrological framework, i.e. laboratory, field and theoretical approaches focused on hydrologic controls on biota, has contributed substantially to our understanding of the function of river networks as ecological corridors. Read More

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http://dx.doi.org/10.1016/j.advwatres.2017.10.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5890385PMC
February 2018

Climate-driven endemic cholera is modulated by human mobility in a megacity.

Adv Water Resour 2017 Oct 27;108:367-376. Epub 2016 Nov 27.

Department of Ecology and Evolution, University of Chicago, Chicago, IL 60637, USA.

Although a differential sensitivity of cholera dynamics to climate variability has been reported in the spatially heterogeneous megacity of Dhaka, Bangladesh, the specific patterns of spread of the resulting risk within the city remain unclear. We build on an established probabilistic spatial model to investigate the importance and role of human mobility in modulating spatial cholera transmission. Mobility fluxes were inferred using a straightforward and generalizable methodology that relies on mapping population density based on a high resolution urban footprint product, and a parameter-free human mobility model. Read More

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http://dx.doi.org/10.1016/j.advwatres.2016.11.013DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5654324PMC
October 2017
1 Read

The spatial spread of schistosomiasis: A multidimensional network model applied to Saint-Louis region, Senegal.

Adv Water Resour 2017 Oct;108:406-415

Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy.

Schistosomiasis is a parasitic, water-related disease that is prevalent in tropical and subtropical areas of the world, causing severe and chronic consequences especially among children. Here we study the spatial spread of this disease within a network of connected villages in the endemic region of the Lower Basin of the Senegal River, in Senegal. The analysis is performed by means of a spatially explicit metapopulation model that couples local-scale eco-epidemiological dynamics with spatial mechanisms related to human mobility (estimated from anonymized mobile phone records), snail dispersal and hydrological transport of schistosome larvae along the main water bodies of the region. Read More

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http://dx.doi.org/10.1016/j.advwatres.2016.10.012DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5637889PMC
October 2017
5 Reads

An enhanced temperature index model for debris-covered glaciers accounting for thickness effect.

Adv Water Resour 2016 Aug;94:457-469

Department of Geography, Northumbria University, NE1 8ST Newcastle, UK.

Debris-covered glaciers are increasingly studied because it is assumed that debris cover extent and thickness could increase in a warming climate, with more regular rockfalls from the surrounding slopes and more englacial melt-out material. Debris energy-balance models have been developed to account for the melt rate enhancement/reduction due to a thin/thick debris layer, respectively. However, such models require a large amount of input data that are not often available, especially in remote mountain areas such as the Himalaya, and can be difficult to extrapolate. Read More

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http://dx.doi.org/10.1016/j.advwatres.2016.05.001DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5270771PMC
August 2016
1 Read

Definition and solution of a stochastic inverse problem for the Manning's n parameter field in hydrodynamic models.

Adv Water Resour 2015 Apr;78:60-79

Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, South Bend, IN.

The uncertainty in spatially heterogeneous Manning's n fields is quantified using a novel formulation and numerical solution of stochastic inverse problems for physics-based models. The uncertainty is quantified in terms of a probability measure and the physics-based model considered here is the state-of-the-art ADCIRC model although the presented methodology applies to other hydrodynamic models. An accessible overview of the formulation and solution of the stochastic inverse problem in a mathematically rigorous framework based on measure theory is presented. Read More

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http://dx.doi.org/10.1016/j.advwatres.2015.01.011DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4415439PMC

Importance of Reversible Attachment in Predicting Transport in Saturated Aquifers From Column Experiments.

Adv Water Resour 2014 Jan;63:120-130

Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027.

Drinking water wells indiscriminatingly placed adjacent to fecal contaminated surface water represents a significant but difficult to quantify health risk. Here we seek to understand mechanisms that limit the contamination extent by scaling up bacterial transport results from the laboratory to the field in a well constrained setting. Three pulses of originating during the early monsoon from a freshly excavated pond receiving latrine effluent in Bangladesh were monitored in 6 wells and modeled with a two-dimensional (2-D) flow and transport model conditioned with measured hydraulic heads. Read More

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http://dx.doi.org/10.1016/j.advwatres.2013.11.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4014781PMC
January 2014

A fractal Richards' equation to capture the non-Boltzmann scaling of water transport in unsaturated media.

Adv Water Resour 2013 Feb;52:292-295

College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.

The traditional Richards' equation implies that the wetting front in unsaturated soil follows Boltzmann scaling, with travel distance growing as the square root of time. This study proposes a fractal Richards' equation (FRE), replacing the integer-order time derivative of water content by a fractal derivative, using a power law ruler in time. FRE solutions exhibit anomalous non-Boltzmann scaling, attributed to the fractal nature of heterogeneous media. Read More

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http://dx.doi.org/10.1016/j.advwatres.2012.11.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3686513PMC
February 2013
3 Reads

Using groundwater age distributions to estimate the effective parameters of Fickian and non-Fickian models of solute transport.

Adv Water Resour 2013 Apr;54:11-21

Department of Land, Air and Water Resources, University of California, Davis.

Groundwater age distributions are used to estimate the parameters of Fickian, and non-Fickian, effective models of solute transport. Based on the similarities between the transport and age equations, we develop a deconvolution based approach that describes transport between two monitoring wells. We show that the proposed method gives exact estimates of the travel time distribution between two wells when the domain is stationary and that the method still provides useful information on transport when the domain is non-stationary. Read More

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http://dx.doi.org/10.1016/j.advwatres.2012.12.008DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4375553PMC

Fractional calculus in hydrologic modeling: A numerical perspective.

Adv Water Resour 2013 Jan 4;51:479-497. Epub 2012 May 4.

Hydrological Science and Engineering, Colorado School of Mines, Golden, CO 80401, USA.

Fractional derivatives can be viewed either as handy extensions of classical calculus or, more deeply, as mathematical operators defined by natural phenomena. This follows the view that the diffusion equation is defined as the governing equation of a Brownian motion. In this paper, we emphasize that fractional derivatives come from the governing equations of stable Lévy motion, and that fractional integration is the corresponding inverse operator. Read More

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http://dx.doi.org/10.1016/j.advwatres.2012.04.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3603590PMC
January 2013
4 Reads

Averaging Theory for Description of Environmental Problems: What Have We Learned?

Adv Water Resour 2013 Jan;51:123-138

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

Advances in Water Resources has been a prime archival source for implementation of averaging theories in changing the scale at which processes of importance in environmental modeling are described. Thus in celebration of the 35th year of this journal, it seems appropriate to assess what has been learned about these theories and about their utility in describing systems of interest. We review advances in understanding and use of averaging theories to describe porous medium flow and transport at the macroscale, an averaged scale that models spatial variability, and at the megascale, an integral scale that only considers time variation of system properties. Read More

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http://dx.doi.org/10.1016/j.advwatres.2011.12.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3563066PMC
January 2013
1 Read

TCAT Analysis of Capillary Pressure in Non-equilibrium, Two-fluid-phase, Porous Medium Systems.

Adv Water Resour 2011 Jun;34(6):770-778

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

Standard models of flow of two immiscible fluids in a porous medium make use of an expression for the dependence of capillary pressure on the saturation of a fluid phase. Data to support the mathematical expression is most often obtained through a sequence of equilibrium experiments. In addition to such expressions being hysteretic, recent experimental and theoretical studies have suggested that the equilibrium functional forms obtained may be inadequate for modeling dynamic systems. Read More

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http://dx.doi.org/10.1016/j.advwatres.2011.04.001DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3097477PMC

Thermodynamically Constrained Averaging Theory Approach for Modeling Flow and Transport Phenomena in Porous Medium Systems: 8. Interface and Common Curve Dynamics.

Adv Water Resour 2010 Dec;33(12):1427-1443

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

This work is the eighth in a series that develops the fundamental aspects of the thermodynamically constrained averaging theory (TCAT) that allows for a systematic increase in the scale at which multiphase transport phenomena is modeled in porous medium systems. In these systems, the explicit locations of interfaces between phases and common curves, where three or more interfaces meet, are not considered at scales above the microscale. Rather, the densities of these quantities arise as areas per volume or length per volume. Read More

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http://dx.doi.org/10.1016/j.advwatres.2010.07.002DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3010759PMC
December 2010

Thermodynamically Constrained Averaging Theory Approach for Modeling Flow and Transport Phenomena in Porous Medium Systems: 7. Single-Phase Megascale Flow Models.

Adv Water Resour 2009 Aug;32(8):1121-1142

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

This work is the seventh in a series that introduces and employs the thermodynamically constrained averaging theory (TCAT) for modeling flow and transport in multiscale porous medium systems. This paper expands the previous analyses in the series by developing models at a scale where spatial variations within the system are not considered. Thus the time variation of variables averaged over the entire system is modeled in relation to fluxes at the boundary of the system. Read More

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http://dx.doi.org/10.1016/j.advwatres.2009.05.010DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2860156PMC

Thermodynamically Constrained Averaging Theory Approach for Modeling Flow and Transport Phenomena in Porous Medium Systems: 5. Single-Fluid-Phase Transport.

Adv Water Resour 2009 May;32(5):681-711

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

This work is the fifth in a series of papers on the thermodynamically constrained averaging theory (TCAT) approach for modeling flow and transport phenomena in multiscale porous medium systems. The general TCAT framework and the mathematical foundation presented in previous works are used to develop models that describe species transport and single-fluid-phase flow through a porous medium system in varying physical regimes. Classical irreversible thermodynamics formulations for species in fluids, solids, and interfaces are developed. Read More

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http://dx.doi.org/10.1016/j.advwatres.2008.10.013DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342734PMC

Thermodynamically Constrained Averaging Theory Approach for Modeling Flow and Transport Phenomena in Porous Medium Systems: 4. Species Transport Fundamentals.

Adv Water Resour 2008 Mar;31(3):577-597

Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 27599-7431, USA.

This work is the fourth in a series of papers on the thermodynamically constrained averaging theory (TCAT) approach for modeling flow and transport phenomena in multiscale porous medium systems. The general TCAT framework and the mathematical foundation presented in previous works are built upon by formulating macroscale models for conservation of mass, momentum, and energy, and the balance of entropy for a species in a phase volume, interface, and common curve. In addition, classical irreversible thermodynamic relations for species in entities are averaged from the microscale to the macroscale. Read More

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http://dx.doi.org/10.1016/j.advwatres.2007.11.004DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2587001PMC
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