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... [Read more...]

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 ... [Read more...]

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... [Read more...]

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 ... [Read more...]

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 post the animated .gif files ... [Read more...]

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... [Read more...]

After I completed the animated tidal water surface elevation plots for the Delaware Estuary, I looked for other systems with a good set of tidal observation stations.  The Lower Columbia River near Portland, Oregon fit the bill.  Using the NOAA PORTS stations, I set up near real-time animated plots of ... [Read more...]

After I completed the animated tidal water surface elevation plots for the Delaware Estuary, I looked for other systems with a good set of tidal observation stations.  The Lower Columbia River near Portland, Oregon fit the bill.  Using the NO... [Read more...]

In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.http://www.epa.gov/wqc/aquatic-life-criteria-ammoniaThese criteria are a function of water temperature and pH, so that the criteria concentration value changes with changing pH and temperature.  ... [Read more...]

In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.http://www.epa.gov/wqc/aquatic-life-criteria-ammoniaThese criteria are a function of water ... [Read more...]

In the Delaware Estuary, the tidal range at the mouth of the estuary becomes amplified, resulting in a larger range (difference between high and low tide water surface elevation) further up the estuary.  One way to visualize this effect is via violin plots.  The data below is from the NOAA ... [Read more...]

In the Delaware Estuary, the tidal range at the mouth of the estuary becomes amplified, resulting in a larger range (difference between high and low tide water surface elevation) further up the estuary.  One way to visualize this effect is via vio... [Read more...]

Here's an animated choropleth (graph using colored map shapes) of HUC8 watersheds in the Delaware River Basin showing water yield over a span of 20 days.  The script is fully automated, pulling USGS gage data from NWIS, computing the water yield t... [Read more...]

I developed an R script to retrieve NOAA PORTS data for the Delaware Estuary overnight and generate an animated water surface elevation plot.  I hope to include this in a larger Delaware River Dashboard web page containing graphs of near real-time... [Read more...]

I am very excited about R at the moment.  Here is an example of an app I constructed for one of the long term monitoring projects at my full time place of employment.https://johnyagecic.shinyapps.io/BoatRunExplorer/ [Read more...]