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cee
@ceenell.bsky.social
lead of viz & analytics, usgs data science. d3.js & rstats. they/them 🏳️‍⚧️
121 followers171 following11 posts
Cceenell.bsky.social

The U.S. has a long history of drought. But in the last 100 years, five drought periods stand out from all the rest. Learn about the 5 droughts that changed history in this new data viz 📊📈from the USGS VizLab labs.waterdata.usgs.gov/visualizatio...

A snippet of the drought timeline data visualization, showing red, orange, and yellow vertical bars clustered together, scrolls with text that reads, “Five droughts that changed history: The U.S. has a long history of droughts, but in the last 100 years, five droughts stand out from all the rest. Explore the droughts that changed history. Click the link in our post”
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Cceenell.bsky.social

This timeline displays the 2,000 most severe drought events at individual streamgages between 1920 and 2020. Severity is a measure of how long (duration) and how dry (intensity) droughts were.

A hydrograph that demonstrates how streamflow drought and severity are defined. Streamflow droughts occur when streamflow is below the drought threshold. This is illustrated with a blue line representing daily fluctuations in streamflow, which occasionally dip below the orange drought threshold line. When this happens, this location would be in streamflow drought. Streamflow drought severity is a measure of how long conditions last and how dry they get. This concept is illustrated by looking at one drought event. Duration, or the length of the drought, and intensity, or the extent of drying, combine to calculate severity, which is the area under the curve between streamflow and the threshold.
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C
cee
@ceenell.bsky.social
lead of viz & analytics, usgs data science. d3.js & rstats. they/them 🏳️‍⚧️
121 followers171 following11 posts
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