Showing papers in "Advances in Water Resources in 2014"

TL;DR: In this article, a method for the measurement of the contact angle between immiscible fluids at the pore scale at reservoir conditions (10 MPa and 50 C) inside a quarry limestone through the use of X-ray microtomography is presented.

TL;DR: This paper analyzes and tracks the evolution of the inverse methods over the last decades, mostly within the realm of hydrogeology, revealing their transformation, motivation and recent trends.

TL;DR: In this article, a volume-of-fluid-based finite volume method was developed for simulating two-phase flow directly on micro-CT images of porous media and an analytical analysis of the relationship between the pore-scale forces and the Darcy-scale pressure drops was presented.

TL;DR: In this article, a lattice Boltzmann color-fluid model based on a concept of continuum surface force is improved to simulate immiscible two-phase flows in porous media, which allows the model to account for different kinematic viscosities of both fluids and to model fluid-solid interactions.

TL;DR: In this article, a pore-throat network is constructed that incorporates both intergranular porosity and microporosity to estimate the medium flow properties of a porous medium such as absolute/relative) permeability and capillary pressure relationships.

TL;DR: In this article, the authors present a generic framework that overcomes possible issues of the currently-used methods and assess the assumptions and issues of these methods, and present a general framework for gauged watersheds with negligible groundwater loss.

TL;DR: In this paper, the authors explored the potential of using SM observations to improve rainfall observations and set a reliable initial wetness condition of the catchment for improving the capability in flood modelling.

TL;DR: In this paper, Independent Component Analysis (ICA) was employed to extract statistically independent water storage patterns over the sub-basins from GRACE and the Global Land Data Assimilation System (GLDAS) model.

TL;DR: In this article, direct numerical simulation of an open channel flow with spherical particles at a bulk Reynolds number of 2941 is presented, and the results are in qualitative agreement with experimental observations at higher Reynolds number.

TL;DR: In this paper, the authors explore the dynamic attribution of water demand to simulated water availability and show that abstractions and feedbacks strongly affect water allocation over time, particularly in irrigated areas.

TL;DR: In this article, a 3D numerical model has been developed to simulate dam-break flow over uneven beds in irregular domains, which solves the Reynolds-Averaged Navier-Stokes equations (RANS) using a finite-volume method based on collocated mesh that fits the solid boundaries such as bed and walls.

TL;DR: The results point to mesh-type tradeoffs that should be considered in flood modeling applications, and a mixed mesh model formulation with LTS is recommended as a general purpose solver because the mesh type can be adapted to maximize computational efficiency.

TL;DR: A parallel dynamic programming algorithm to optimize the joint operation of a multi-reservoir system using a peer-to-peer parallel paradigm based on the distributed memory architecture and the message passing interface (MPI) protocol is developed.

TL;DR: In this article, a two-step procedure is implemented for estimating the rain estimation accuracy: (i) first kriging normalized ESDs are computed by using normalized variograms (sill equal to 1) to account for the observation system configuration and the spatial structure of the variable of interest (rainfall amount, residuals to the drift).

TL;DR: In this article, an analytical model for predicting the vertical distribution of mean streamwise velocity in an open channel with double-layered rigid vegetation is proposed, and good agreement between the analytical predictions and experimental data demonstrated the validity of the model.

TL;DR: In this article, the authors consider the dynamics of a meniscus in a corner as it can be encountered in angular pores and investigate this process in detail by means of direct numerical simulations that solve the Navier-Stokes equations in the pore space and employ the Volume of Fluid method (VOF) to track the evolution of the interface.

TL;DR: In this article, the shallow water equations (SWE) and the Exner equation are combined using a Jacobian matrix to provide accurate and stable results for free surface flows over mobile beds.

TL;DR: A conceptual mathematical model was developed to describe the simultaneous transport (cotransport) of viruses and colloids in three-dimensional, water saturated, homogeneous porous media with uniform flow.

TL;DR: In this paper, a tree-based model predictive control (TB-MPC) is used to set up a multistage stochastic programming, which finds a different optimal strategy for each branch and enhances the adaptivity to forecast uncertainty.

TL;DR: In this paper, the influence of tides and waves on the transport and transformation of nutrients in a homogeneous unconfined nearshore aquifer and subsequent fluxes to the sea was investigated.

TL;DR: In this article, an analytical expression for the shear dispersion during solute transport in a coupled fracture-matrix system was presented, and the results were compared with those in a non-coupled system.

TL;DR: In this article, the authors applied remotely sensed and model data over Ethiopia in order to test the performance of models and remotely sensed data in modeling water resources distribution in ungauged arid regions of Ethiopia, analyze the inter-annual and seasonal variability as well as changes in total water storage (TWS) over Ethiopia, and understand the relationship between TWS changes, rainfall, and soil moisture anomalies over the study region.

TL;DR: It is shown that the combination of the fracture cross-flow equilibrium and the implicit composition calculation in the fractures increase the computational speed 20–130 times in 2D and in 3D, one may expect even a higher computational efficiency.

TL;DR: In this article, a transient flux-related dilution index is proposed to quantify the evolution of solute dilution at a given position along the main flow direction in saturated porous media.

TL;DR: In this paper, the authors investigated local scour around cylinders in a side-by-side or tandem arrangement under clear-water conditions, using large eddy simulations with a Smagorinsky subgrid model combined with a ghostcell immersed boundary method, and details of the bed scouring are realized with sophisticated sediment and morphodynamic models.

TL;DR: In this article, an effective spatial Markov model was developed to describe transport all the way from preasymptotic to asymptotic times, and correlation effects must be included in such an effective model when Peclet numbers are larger than O(100) to reliably predict observed breakthrough curves and the temporal evolution of second centered moments.

TL;DR: In this article, the authors demonstrate the capabilities of LSPIV to accurately evaluate complex flow patterns in shallow channel flows and estimate depth in shallow flows using exclusively LSPV measurements.

TL;DR: In this article, the Lunardini solution was used for predicting soil thawing subject to conduction, advection, and phase change. But, the accuracy of the solution was not shown to be proportional to the Stefan number.

TL;DR: In this paper, the authors investigated competition for water among multiple tree rooting systems using a soil-plant model that accounts for soil moisture dynamics and root water uptake (RWU), whole plant transpiration, and leaf-level photosynthesis.

TL;DR: In this paper, the authors used a physically-based distributed numerical framework that is based on an accurate representation of the drainage network and applied it to the Cedar River basin (A = 16, 861 km 2 ), which is located in Eastern Iowa, USA.