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River Science: Current Speed

Current speed is a major factor for any waterborne vessel. When we sail with the current, the water travels with us, speeding us along. When we move against the current, the oncoming water pushes against us, slowing us down. In addition, the Hudson and Connecticut Rivers are estuaries, and thus affected by ebb and flood tides; this causes a river's current to slow and even reverse itself several times a day. Keeping track of the current is vital for ships looking to make good time on the water. This was even more true in the 17th century, when attempting to sail against the current's strength could easily prove futile.

Measuring the current is trickier than it looks. Our crew members learn that waves rippling across the water's surface are actually caused by the wind (and, with practice, can even be used to estimate wind speed) — but those ripples don't tell us anything about the current's speed or direction.

Waves may not tell us about the current, but debris floating in the water can. To measure the current, students would toss a biodegradable wood chip into the water, then time how long the chip takes to float down the length of the weather deck. Some quick calculations are then needed to determine in what direction, and how strongly, the the water is pushing us.

On this voyage, the research team of Eliu, Erica, and Joey studied current speed for their research project, eventually joining forces with the Height of Tide team to present a comprehensive study of tidal patterns as we experienced them during our data collection layover at Rock Landing.

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