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RISSpecial Issue on Advances in Wetland Hydrology and Water Quality Processes Modeling
Publisher: American Society of Civil Engineers
Stochastic Residual-Error Analysis for Estimating Hydrologic Model Predictive Uncertainty
Publisher: American Society of Civil Engineers
Abstract: A hybrid time series-nonparametric sampling approach, referred to herein as semiparametric, is presented for the estimation of model predictive uncertainty. The methodology is a two-step procedure whereby a distributed ...
Hydrologic Modeling of an Eastern Pennsylvania Watershed with NEXRAD and Rain Gauge Data
Publisher: American Society of Civil Engineers
Abstract: This paper applies the Soil Water Assessment Tool (SWAT) to model the hydrology in the Pocono Creek watershed located in Monroe County, Pa. The calibrated model will be used in a subsequent study to examine the impact of ...
Bayesian Framework for Water Quality Model Uncertainty Estimation and Risk Management
Publisher: American Society of Civil Engineers
Abstract: A formal Bayesian methodology is presented for integrated model calibration and risk-based water quality management using Bayesian Monte Carlo simulation and maximum likelihood estimation (BMCML). The primary focus is on ...
Interlayer Diffusive Transfer and Transport of Contaminants in Stratified Formation. I: Theory
Publisher: American Society of Civil Engineers
Abstract: This paper deals with modeling depth-averaged solute transport and lateral-diffusive transfer in a two-layer system of contrasting permeabilities. Two-dimensional transport equations are developed, by averaging the local ...
Interlayer Diffusive Transfer and Transport of Contaminants in Stratified Formation. II: Analytical Solutions
Publisher: American Society of Civil Engineers
Abstract: Transverse diffusive transfer of solute mass between regions of mobile and immobile water is a key mechanism causing tailing and reduced peak concentrations. In Part 1, we developed a two-dimensional first-order rate model ...
Estimation of Spatially Variable Aquifer Hydraulic Properties Using Kalman Filtering
Publisher: American Society of Civil Engineers
Abstract: Spatial variability of aquifer properties and hydraulic heads are modeled as random fields, and their estimates are achieved by Kalman filtering. The state-space equation is developed from a quasi-analytical solution of a ...
Stochastic Solution to Inverse Problem in Ground Water
Publisher: American Society of Civil Engineers
Abstract: A solution to the inverse problem in groundwater is presented with a geostatistical framework, using Kalman filtering and a nonlinear gradient-based search technique. The Kalman filtering recursions are based on a newly ...
Temporal Moment Analysis for Volatile Organic Compounds in Dual-Porosity Porous Media: Loss Fractions and Effective Parameters
Publisher: American Society of Civil Engineers
Abstract: Using transform techniques, analytical expressions for potential losses by volatilization and degradation are developed for several organic compounds in dual porosity porous media. A sensitivity analysis is conducted to ...
Development and Application of a Methodology for Sediment Source Identification. I: Modified Unit Sedimentograph Approach
Publisher: American Society of Civil Engineers
Abstract: Identification of sediment source areas within a watershed is useful for designing appropriate management alternatives that reduce sediment losses. In most watersheds, data collection programs are present at the stream ...