本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯
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If you are not a Physics person, read on and learn a fact of physics. 5.39.217.76) w: f; W' t( |# F3 n
AMAZING! 6 t, M3 `" \9 }6 c H4 m6 A+ r
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Even after you see it, it is still hard to believe!
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, @, \) U3 v; N% n! a! rtvb now,tvbnow,bttvbMagdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 6 C- `+ ~6 ?/ \! |4 D. U
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
0 ^& Z6 V% l8 k1 `$ K& q' _$ JIt is located in the city of Magdeburg, near Berlin.tvb now,tvbnow,bttvb4 d% d( d# K2 d) H, W
% g* S! P8 Y0 L; I! _) ^The photo was taken on the day of inauguration.
" b; D+ E3 V% w6 qtvb now,tvbnow,bttvbTo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.1 K; L: W% i" b
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Question:. X8 a4 X# N& P: n4 y/ j" x6 O* {( I
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Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,tvb now,tvbnow,bttvb, T5 x. w1 K+ w' ^( ]) v; S! ?! ?
Or just the weight of the water? 5.39.217.765 P; L- n* ]8 }( h! ~ Z
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Answer:( j5 L& I- F7 l, d( F
# j2 z/ V* P& GIt only needs to be designed to withstand the weight of the water!
' ]% E3 L) {, ]5 |' X* l5 FWhy? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded
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The Incredible Magdeburg Water Bridge in Germany; ]8 P) ]7 P6 a5 @7 f1 g
The Magdeburg Water Bridge is a navigable aqueduct in Germany that connects the Elbe-Havel Canal to the Mittelland Canal and allows ships to cross over the Elbe River. At 918 meters, it is the longest navigable aqueduct in the world.tvb now,tvbnow,bttvb+ t* Y9 I: y2 X v
The Elbe-Havel and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe Ships moving between the two had to make a 12-kilometer detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo.
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Construction of the water link was started as early as in the 1930s but due to the World War 2 and subsequent division of Germany the work remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003. 5.39.217.76& K- Q% S; `$ ?, \$ }
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