Showing papers in "Advances in Water Resources in 1999"

TL;DR: In this paper, a robust procedure to decompose these components, named the error separation method (ESM), is proposed, discussed, and demonstrated, which allows the estimation of the radar error part and description of the uncertainties of hydrological radar products in rigorous statistical terms.

TL;DR: In this article, a simple soil-moisture accounting model with a small number of independent and physically based parameters was used to explore the sensitivity of runoff to climate change for three simplified climates.

TL;DR: In this article, the authors used observations of precipitation and streamflow from Ireland to test for climatic and hydrologic change in this maritime climate of the northeast Atlantic, and found that an increase in annual precipitation was found to occur after 1975.

TL;DR: In this paper, large eddy simulations of turbulent flow and transport in the atmospheric boundary layer were conducted over heterogeneous sources of heat and water vapor to identify the blending properties of the turbulent mixing in an unstably stratified boundary layer.

TL;DR: In this article, an extension of the inverse parameter estimation method to the modified multi-step outflow method for two-fluid (air-water, air-oil and oil-water) flow systems was considered.

TL;DR: In this paper, the second law of thermodynamics is exploited as a constraint-type relationship for the derivation of constitutive equations relating flow velocities, pressure potential differences, as well as mass and force exchanges within and across the boundaries of a watershed.

TL;DR: In this article, a chain-dependent model for daily precipitation is presented, with the intensity distribution being the gamma, and a sensitivity analysis is performed to examine how the effective return period for extreme high precipitation amounts would change as the parameters of the chaindependent process change (i.e., probability of a wet day, shape and scale parameters of gamma distribution).

TL;DR: In this paper, the authors considered variable switching for finite elements in two and three dimensions and incorporated it in both an adaptive error-controlled predictor-corrector one-step Newton (PCOSN) iteration strategy and a target-based full Newton (TBFN) iteration scheme.

TL;DR: An optimal order of convergence is shown for a wide range of two-phase flow problems including heterogeneous media and vanishing capillary pressure in an experimental way and a data parallel implementation of the Newton-multigrid algorithm with speedup results is presented.

TL;DR: A new method for the generation of streamline-oriented grids which handles wells in the grid interior, and which produces orthogonal grids for anisotropic systems is introduced.

TL;DR: In this paper, the authors compared the performance of fractional flow approaches to the governing equations of the multi-phase flow equations with other approaches and the implication of equation form for numerical methods discussed.

TL;DR: In this paper, a method is proposed to determine the phase-volume fractions in tomographic representations of two-phase systems, which is applicable in cases where no independent mean values for the phasecharacteristic property (α) are available, such as in standard X-ray computed tomography (CT) using a polychromatic source.

TL;DR: In this paper, the authors present algebraic solutions for tidal propagation in spatially heterogeneous one-dimensional aquifers, which are based on existing solutions for homogeneous aquifer solutions for sinusoidal linear boundary conditions.

TL;DR: In this article, two cell-centered finite volume schemes are presented for the simulation of advection-dominated reactive transport in groundwater, one based on rectangular grids and the other based on streamline-oriented grids.

TL;DR: In this paper, a series of borehole resistivity measurements and a resistivity-salinity relation was found under the shore with semi-diurnal tides at the French-Belgian border.

TL;DR: In this paper, the authors provided the thermodynamic approach and constitutive theory for closure of the conservation equations for multiphase flow in porous media, and showed that capillary pressure is a function of interphase area per unit volume as well as saturation.

TL;DR: In this paper, a soil-vegetation-atmosphere transfer scheme, which solves the coupled system of the Surface Energy and Water Balance (SEWAB) equations considering partly vegetated surfaces, is presented.

TL;DR: In this article, a set of nonlinear partial differential equations and derive explicit (exact) and semi-explicit solutions, under various assumptions, were derived for a wide range of density differences between resident and invading fluids.

TL;DR: Adaptive time-stepping methods provided robust solutions; in most cases transforming the dependent variable led to more efficient solutions than untransformed approaches, especially as the pore-size uniformity increased; and the higher-order adaptive time integration method was robust and the most efficient method evaluated.

TL;DR: In this article, a new analysis of daily streamflow reported here found no attractor with D ⩽5, and phase randomization of the Fourier Transform of streamflow was used to provide a better stochastic surrogate than an Autoregressive Moving Average (ARMA) model or gaussian noise.

TL;DR: In this paper, a three-dimensional analytical solution for solute transport in saturated, homogeneous porous media is developed, which accounts for threedimensional dispersion in a uniform flow field, first-order decay of aqueous phase and sorbed solutes with different decay rates, and nonequilibrium solute sorption onto the solid matrix of the porous formation.

TL;DR: In this article, a regional-scale, steady-state, saturated-zone ground-water flow model was constructed to evaluate potential regional groundwater flow in the vicinity of Yucca Mountain, Nevada.

TL;DR: A semi-analytic solution to the mixed-type boundary value problem for a flowing partially penetrating well with infinitesimal skin situated in an anisotropic aquifer is developed in this article.

TL;DR: A method of creating high-resolution Digital Terrain Models of stream channels using an electronic, digital, total-station theodolite and standard methods of land surveying is described, and also includes considerations unique to hydrological application.

TL;DR: Two field-scale simulations of a DNAPL-contaminated carbonate bedrock site in Ontario, Canada compare different methods of grid discretization, and highlight the importance of grid refinement when simulatingDNAPL migration problems in fractured porous media.

TL;DR: In this paper, the self-calibrated method has been extended for the generation of equally likely realizations of transmissivity and storativity conditional to both steady-state and transient hydraulic head data.

TL;DR: Two characteristic methods for the solution of the linear advection diffusion equations which use a second order Runge–Kutta approximation of the characteristics within the framework of the Eulerian–Lagrangian localized adjoint method are developed.

TL;DR: In this paper, a recent approach to solve the Richards' equation is further improved, and applied to analyze the standard hydrologic tool of Time Compression Approximation (TCA).

TL;DR: In this paper, a coupled flow-mass transport inverse problem is formulated using the maximum likelihood estimation concept and an evolutionary computational algorithm, the genetic algorithm, is applied to search for a global or near-global solution.

TL;DR: In this paper, the authors evaluate the design of a transient, radial, multi-step outflow experiment, and to determine unsaturated hydraulic parameters using inverse modeling, and demonstrate that a small error in absolute permeability, if determined in an independent experiment, leads to biased estimates of hydraulic properties.