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.
2A 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.
1Effluent 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.
1Monte 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.
3Box 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.
4Blow 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.
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.
4Delaware 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.
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.
High Flows in Lower Columbia River near Portland, OR
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.
Animated 3D Plot of Ammonia Toxics Criteria
In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.
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