Blog Archives

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...

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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...

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Box Plot as Goal Post

May 7, 2016
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Box Plot as Goal Post

For as long as I have been working with water data, I wanted to construct a line graph superimposed on a box and whisker plot where the boxes show the distribution of values and the line shows some current condition.  One of my favorite things abo...

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Blow Out Tide in the Delaware Estuary

April 5, 2016
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Blow Out Tide in the Delaware Estuary

High winds in the Delaware Estuary region caused a "blowout" tide in early April 2016, where observed water surface elevations were much lower than those predicted via harmonic constituents.  Extreme low blowout tides can hamper navigation due ins...

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Animated Flow in the non-tidal Delaware River

March 27, 2016
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Animated Flow in the non-tidal Delaware River

The Delaware River experienced some high flow in late February 2016, providing an opportunity for an interesting animated graph of river response.This plot was developed using data from the USGS NWIS system for gauges on the Delaware River, retrieved w...

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Delaware versus Chesapeake revisited

January 26, 2016
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Delaware versus Chesapeake revisited

In this earlier post, I analyzed tidal water surface elevation data from the NOAA PORTS system from both the Delaware Estuary and the Chesapeake Bay, showing how the two systems react very differently to the tidal forcing at their Atlantic Ocean bounda...

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Population Model Revisited

January 17, 2016
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Population Model Revisited

In a previous post I showed an animated age structure diagram depicting output from a simple population model written in Excel.  Here is another version of that model written in R.  One of the things I like about the R version is that I can p...

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