本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯
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7 z0 C* [* D4 ~% _If you are not a Physics person, read on and learn a fact of physics. 1 J1 _0 n2 G, f, K) F. H4 O) S: s1 g/ E
AMAZING!
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Even after you see it, it is still hard to believe!
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2 B! \5 _3 `/ i* T' c5 z& {, ~1 Y$ u# ltvb now,tvbnow,bttvbMagdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
& s) v$ G1 F+ h# K& m3 N6 Y公仔箱論壇This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
) } R. F! B5 b1 ]7 ?( WIt is located in the city of Magdeburg, near Berlin.公仔箱論壇; ^! t3 Z- T$ k& o1 _; g2 m
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The photo was taken on the day of inauguration.5.39.217.76* j+ p$ ?5 K0 ~8 [/ A( h& I$ R7 }# n. `
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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Question:+ h! S' O- V: k7 C
0 Z/ C2 a/ Q9 W1 O: V# Z( X1 ?公仔箱論壇Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,
8 q9 z! i7 Z/ @; s1 B( t$ S1 fTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Or just the weight of the water?
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Answer:
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It only needs to be designed to withstand the weight of the water! 5.39.217.76$ _* \7 g e/ {+ ^5 _# J
Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded! I7 D! d- c, r3 J
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, O, w( l3 a7 e B7 ]0 a5.39.217.76The Incredible Magdeburg Water Bridge in Germany5.39.217.76' {" V# k$ ]% w4 x( R) ~" V, m
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.
' N7 @; a7 _ Q; x5 mThe 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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0 ?5 x% R2 g/ yConstruction 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.
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