Skip to main content
U.S. flag

An official website of the United States government

Virtual Beach 3: user's guide

December 1, 2013

Virtual Beach version 3 (VB3) is a decision support tool that constructs site-specific statistical models to predict fecal indicator bacteria (FIB) concentrations at recreational beaches. VB3 is primarily designed for beach managers responsible for making decisions regarding beach closures or the issuance of swimming advisories due to pathogen contamination. However, researchers, scientists, engineers, and students interested in studying relationships between water quality indicators and ambient environmental conditions will find VB3 useful. VB3 reads input data from a text file or Excel document, assists the user in preparing the data for analysis, enables automated model selection using a wide array of possible model evaluation criteria, and provides predictions using a chosen model parameterized with new data. With an integrated mapping component to determine the geographic orientation of the beach, the software can automatically decompose wind/current/wave speed and magnitude information into along-shore and onshore/offshore components for use in subsequent analyses. Data can be examined using simple scatter plots to evaluate relationships between the response and independent variables (IVs). VB3 can produce interaction terms between the primary IVs, and it can also test an array of transformations to maximize the linearity of the relationship The software includes search routines for finding the "best" models from an array of possible choices. Automated censoring of statistical models with highly correlated IVs occurs during the selection process. Models can be constructed either using previously collected data or forecasted environmental information. VB3 has residual diagnostics for regression models, including automated outlier identification and removal using DFFITs or Cook's Distances.

Citation Information

Publication Year 2014
Title Virtual Beach 3: user's guide
DOI
Authors Mike Cyterski, Wesley Brooks, Mike Galvin, Kurt Wolfe, Rebecca Carvin, Tonia Roddick, Mike Fienen, Steve Corsi
Publication Type Report
Publication Subtype Other Government Series
Series Title
Series Number EPA/600/R-13/311
Index ID 70111687
Record Source USGS Publications Warehouse
USGS Organization Wisconsin Water Science Center