The turning bands method (TBM) for the simulation of multidimensional random fields is presented. These commonly occur in Monte Carlo hydrologic processes, particularly groundwater flow and mass transport. general TBM equations two‐ three‐dimensional are derived with particular emphasis on more complicated two‐dimensional case. For stationary unidimensional line process generated by a simple spectral method, technique which can be generally applied to any covariance function easily extended...

Advection through hyporheic zones (HZ) consisting of heterogeneous channel bend streambed deposits and their equivalent homogenous medium was investigated using finite difference groundwater flow transport simulations forward particle tracking. The top prescribed head boundary varied in order to mimic various stream distributions resulting from the presence bed forms curvature. Flux calculations show that heterogeneity causes significant additional HZ flux compared an medium. However, major...

Sustainability necessitates the protection of infrastructure from any kind deterioration over life cycle asset. Deterioration in capacity reinforced concrete (RC) (e.g., bridges, buildings, etc.) may result localised damage sustained during extreme loading scenarios, such as earthquakes, hurricanes or tsunamis. In addition, factors corrosion rebars ageing also deteriorate degrade an RC column, thereby necessitating immediate strengthening to either extend ensure its design is not limited....

Abstract This paper addresses the problem of assessing seismic resistance brick masonry walls subject to out‐of‐plane bending. A simplified linearized displacement‐based procedure is presented along with recommendations for selection an appropriate substitute structure in order provide most representative analytical results. trilinear relationship used characterize real nonlinear force–displacement unreinforced walls. Predictions magnitude support motion required cause flexural failure using...

In part 1 of this paper, first and second order analysis uncertainty is applied to numerical models groundwater flow. The are cast in state‐space form, with boundary conditions inputs that functionally dependent, but statistically independent, time. Using a compact matrix calculus notation, Taylor series expansions the model equations derived used estimate mean variance‐covariance properties piezometric head predictions, given corresponding statistics for aquifer parameters: material...

This paper exposes the significant role played by gas‐water interface in fate and transport of colloids porous media also introduces a micromodel method to allow direct visualization colloid behavior pore networks. The was created trapping air space. Various types latex clay particles, as well bacteria, were studied. results suggest that sorbs not only hydrophobic but hydrophilic particles. degree sorption is controlled particle surface hydrophobicity, solution ionic strength, charge sign....

Interfaces between a water column and underlying porous media are ubiquitous in nature. Turbulent flow over an irregular interface separating drives advective‐fluid exchange the two domains. We investigate dynamics of this coupled system for unidirectional triangular modeled on dunes. Numerical simulations solve Reynolds‐averaged Navier‐Stokes equations then Darcy's Law continuity equation media. The sets via pressure distribution along interface. maximum minimum interface, which tied to...

This paper explores the significance of gas‐water interface on colloid sorption and transport. Three types common saturation conditions were simulated in packed sand columns: (1) a completely water‐saturated condition, (2) gas bubbles trapped by capillary forces as nonwetting residual phase (15% gas), (3) present continuous (46% or other words, vadose zone situation. Different saturations provided different interfacial conditions. Two polystyrene latex particles (0.2 μm), hydrophilic...

Research Article| January 01, 2001 Internal architecture, permeability structure, and hydrologic significance of contrasting fault-zone types Geoffrey C. Rawling; Rawling 1Department Earth Environmental Science, New Mexico Tech, Socorro, 87801, USA Search for other works by this author on: GSW Google Scholar Laurel B. Goodwin; Goodwin John L. Wilson Author Article Information Publisher: Geological Society America Received: 21 Jun 2000 Revision 06 Oct Accepted: First Online: 02 2017 Online...

Adjoint sensitivity theory is currently being considered as a potential method for calculating the of nuclear waste repository performance measures to parameters system. For groundwater flow systems, interest include piezometric heads in vicinity site, velocities or travel time aquifers, and mass discharge biosphere points. The recharge‐discharge rates, prescribed boundary fluxes, formation thicknesses, hydraulic conductivities. derivative measure with respect system usually taken...

Backward location and travel time probabilities can be used to determine the prior of contamination in an aquifer. For a contaminant particle that was detected aquifer, backward probability is where located at some time. when position upgradient detection. These improve characterization known sources groundwater contamination, identify previously unknown sources, delineate capture zones. simple model domains, obtained heuristically from forward transport. multidimensional problems complex...

This paper presents a computer algorithm that is capable of cogenerating pairs three‐dimensional, cross‐correlated random fields. The produces fields real variables by the inverse Fourier transform randomized, discrete three‐dimensional spectral representations variables. randomization done in domain way preserves direct power and cross‐spectral density structure. Two types cross spectra were examined. One type specifies linear relationship between two fields, which same correlation scales...

Finite difference and finite element methods are frequently used to study aquifer flow; however, additional analysis is required when model parameters, hence predicted heads uncertain. Computational algorithms presented for steady transient models in which storage coefficients, transmissivities, distributed inputs, boundary values may all be simultaneously Innovative aspects of these include a new form generalized condition; concise discrete derivation the adjoint problem with variable time...

ABSTRACT A generalized lumped parameter ground‐water model is developed based on simultaneous water and solute balances for a phreatic aquifer. The basis the approach established by comparison with theoretical analyses of dynamics in distributed aquifer model. basic behavior characterized two response times, one associated hydraulics other solute. applied to simulate impact highway deicing salts quality eastern Massachusetts. results, obtained digital computer simulation, are found be...

Hyporheic exchange plays a key role in the biogeochemical evolution of water and ecosystem functioning at local, reach, watershed scales. Residence time is fundamental metric to describe possible transformation taking place this zone. With mind, we use simple conceptual model explore residence distributions (RTDs) sinuosity‐driven hyporheic zones (HZs) discriminate individual effect sinuosity ( σ ), valley slope J x hydraulic conductivity K aquifer dispersivity α L timescales (BTSs) that...

Journal Article VISUAL FIELD CHANGES FOLLOWING ANTERIOR TEMPORAL LOBECTOMY: THEIR SIGNIFICANCE RELATION TO "MEYER'S LOOP" OF THE OPTIC RADIATION Get access MURRAY A. FALCONER, FALCONER Guy's-Maudsley Neurosurgical UnitLondon Search for other works by this author on: Oxford Academic PubMed Google Scholar JOHN L. WILSON Brain, Volume 81, Issue 1, March 1958, Pages 1–14, https://doi.org/10.1093/brain/81.1.1 Published: 01 1958