Blog Archives

50 years of Delaware Estuary Dissolved Oxygen

May 16, 2018
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50 years of Delaware Estuary Dissolved Oxygen

The Delaware River Basin Commission's Delaware Estuary water quality monitoring program, which was initiated in 1967, is one of the longest running monitoring programs in the world.  One advantage of such a long data set is that we can see the cha...

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Hurricane Irene at the Delaware Estuary Revisited

August 12, 2017
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Hurricane Irene at the Delaware Estuary Revisited

Back in August 2011, Hurricane Irene struck the mid-Atlantic coast.  This animated graph shows how the storm surge from Irene and the terrestrial flooding from Irene and Tropical Storm Lee (a few days later) impacted water surface elevations in the Delaware Estuary.This post is the third in a series revisiting older data visualizations using R.  Water surface elevation data...

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Playing with the US Population

August 6, 2017
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Playing with the US Population

Here's an app that illustrates how fertility and death rates impact the US age structure diagram over time.  The app uses a simple population model to forecast the US age structure in 100 years, starting from 2010 census data and user-selected fertility and death rates.You can find and play with the app at https://johnyagecic.shinyapps.io/AgeStructureShiny/E-mail [email protected] for the R code.

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Superstorm Sandy at the Delaware Estuary Revisited

June 17, 2017
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Superstorm Sandy at the Delaware Estuary Revisited

Continuing on the theme of updating older visualizations into newer formats, below is a clip of the impact of Superstorm Sandy on Delaware Estuary water surface elevations.  The original MS Excel and screen capture version is posted here.  The new version developed in R with the animation package is cleaner and more portable.The graph shows measured and predicted water surface...

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Superstorm Sandy at Barnegat Bay Revisted

June 11, 2017
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Superstorm Sandy at Barnegat Bay Revisted

Animations of continuous data in GIF format offer some portability advantages over video files.  A few years ago, shortly after Superstorm Sandy, a colleague and I developed a video of animated water surface elevations from USGS gages in Barnegat Bay, NJ as the eye of the storm approached.  That version used video screen capture and MS Excel VBA -...

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Delaware River Water Quality Visualization App

January 10, 2017
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Delaware River Water Quality Visualization App

The Delaware River Basin Commission (DRBC) just released a new app for visualizing water quality in the Delaware River Basin.  The DRBC Special Protection Waters Monitoring Program Explorer is a Shiny app that allows users to generate a boxplot and summary table of selected water quality data. The boxplot and summary table are updated each time the user selects...

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Solar PVC Growth from One Time Investment: A Monte Carlo Analysis Shiny App

December 4, 2016
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Solar PVC Growth from One Time Investment:  A Monte Carlo Analysis Shiny App

Imagine you bought solar PVC arrays today, sold the power generated to your local utility, and used the proceeds to add new solar arrays each year.  What generating capacity would you expect in 100 years?  What would be the impact of uncertainties in inflation and power generation?  I've been obsessed with this idea for a while.  I developed a...

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A Shiny App for estimating Multiplier Exponent Curves from Manning’s Equation Inputs

August 22, 2016
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A Shiny App for estimating Multiplier Exponent Curves from Manning’s Equation Inputs

WASP and other flow and water quality models ask users to input multiplier and exponent values relating velocity and depth to discharge. These relationships take the form of V=aQ^b and depth=cQ^d, where the values a, b, c, and d describe the curve that approximates paired points from other sources. When paired field measurements are lacking, Manning's equation provides an...

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Effluent Nutrient Concentrations by Waste Water Treatment Type: A Shiny App

August 12, 2016
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Effluent Nutrient Concentrations by Waste Water Treatment Type: A Shiny App

In 2014, EPA documented the relative lack of nutrient data from waste water treatment plant effluents, even though development of surface water quality standards for nitrogen and phosphorus has been a stated priority for more than a decade.   A new shiny app lets users explore effluent nutrient concentrations from an existing data set by waste water treatment plant...

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Monte Carlo Analysis of Manning’s Equation: A Shiny App

July 20, 2016
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Monte Carlo Analysis of Manning’s Equation:  A Shiny App

Monte Carlo analysis is a great way to explore the impact of input variable uncertainty on the results of engineering equations, and with vector variables and distribution and sampling functions at its core, R is a natural platform for this analysis. During a recent rainy vacation, I built a Shiny app that applies Monte Carlo analysis to Manning's Equation...

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