Transactions of the American Society of Civil Engineers volume 11
Transactions of the American Society of Civil Engineers volume 11
American Society of Civil Engineers
The book Transactions of the American Society of Civil Engineers volume 11 was written by author American Society of Civil Engineers Here you can read free online of Transactions of the American Society of Civil Engineers volume 11 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Transactions of the American Society of Civil Engineers volume 11 a good or bad book?
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05. Comparing the results with observation, he concludes that /\ is com- posed of two parts, one due to the friction of the bed, the other to eddies. When the rise is gentle, or the change of height not abrupt, the eddies are very slight ; A represents friction only, and is very small. H as calculated agrees very closely with H as observed. When the rise [ressaut) is sudden, {he friction is slight (being on a very short length); that part of A due to change of section is great, and /fas observe...d is less than H as given by calculation. In the Aqueduct Bridge of Crau (Canal de Craponne), the rise (Fig. 13, Plate XXI), is caused by a sudden and considerable reduction of the rate of slope of the bottom. The calculated rise due to difference of velocities was 0. 56m ; the height of rise observed was 0. 45m; the loss of head therefore due to the sudden change of section (eddies, &c. ) was 0. 11?re. In the aqueduct of Marseilles, the ressaut (Fig. 14, Plate XXI), occurs at the lower end of the aqueduct bridge of Roquefavour, and is due chiefly to the sudden enlargement of section in passing from the masonry channel to the open canal, to a curve, and to a slight counter- slope below.
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