Blog Archives

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

July 20, 2016
By
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...

Read more »

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 about ggplot2 is that it allows users to construct complex combinations of graphs in...

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Box Plot as Goal Post

May 7, 2016
By
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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Blow Out Tide in the Delaware Estuary

April 5, 2016
By
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 insufficient depth.This animated graph was created in R using data obtained from the NOAA PORTS system for the Delaware Estuary, using the...

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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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Animated Flow in the non-tidal Delaware River

March 27, 2016
By
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 with the excellent dataRetrieval library for R from USGS and the also great animation library.  The plot shows the discharge...

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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 boundaries.  Animated plots may be even more effective at demonstrating this difference in response.  In the Delaware, the...

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Delaware versus Chesapeake revisited

January 26, 2016
By
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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