Tag: Venice

To Keep Venice From Going Underwater, Researchers Say, Pump Water Under Venice

By Valerie Ross | December 29, 2011 2:19 pm


Flooding in Piazza San Marco, Venice

Venice is sinking, and the nearby Adriatic sea—like the global sea level—is rising. The city could, some estimates suggest, be underwater by the end of the century. Much of the trouble is due to Venice’s precarious, low-lying position in the middle of a lagoon, but human activity in the area has played a role in the city’s subsidence, as well. As Scott K. Johnson explains at Ars Technica:

The pumping of shallow groundwater in the mid-1900s also contributed to the problem. Water in the pores between grains of sediment provides pressure that bears some of the load. When pore pressure decreases, or water is removed completely, grains can be packed together more tightly by collapsing the pore spaces. As sediment is compacted, the land surface drops. While the effect was small (less than 15cm), Venice doesn’t have much wiggle room.

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CATEGORIZED UNDER: Environment

Acoustical Archaeologists Solve the Mystery of the Doge's Stereo System

By Veronique Greenwood | November 3, 2011 12:25 pm

church
Saint Mark’s basilica was where many Venetian polyphonic works had their debut performances, but the reverb presented a puzzle for historians.

Ah, the Renaissance—lots of deep thinkers, gorgeous art, busty maidens, fried dough on a stick (if Ren faires are to be believed), and the liveliest music this side of the Middle Ages. But when you compare the elaborate, up-tempo harmonies of late Renaissance polyphony to the churches where they would have been performed, a serious discrepancy pops up. Giant Renaissance churches like Saint Mark’s basilica and the Redentore, both in Venice, have way too long of a reverberation time for those tunes to sound good. It takes a full 7 seconds for a note to fade after it’s played or sung, and that means that songs, especially fast ones, blend into a giant muddy mess.

A physicist and a music technologist, who presented their work at the American Acoustical Society on Monday, wondered if the churches, when packed full of people and hung with heavy draperies during holy festivals, might have sounded much better than they do today. Working with architectural historians, they calculated the chairs, drapery, and audience members’ ability to absorb sound. With a computer model of the churches, they were able to show that with full-on holy regalia and a crowded audience, the reverberation time was cut in half. They took their analysis even further to see if the small pergoli, or balconies, installed by an architect in Saint Mark’s would have enhanced the experience of a person sitting in the Doge’s throne when a choir was split between them (all the rage in Renaissance Venice). Indeed, they found that with a split choir in a fully decorated church, the reverberation time at the Doge’s throne was reduced to a mere 1.5 or 2 seconds, which is the gold standard for modern concert halls.

To hear the Doge’s stereo system for yourself, click here and scroll to the bottom of the page.

[via ScienceNOW]

Image courtesy of Andreas Tille / Wikimedia Commons

CATEGORIZED UNDER: Physics & Math, Technology
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