River Discharge

River Discharge

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...method. Vertical velocity-curves should be constructed for all stations at different stages in order to determine whether coefficients should be applied to the results obtained by the other point methods. Such application of coefficients should be made, however, only on unquestionable evidence furnished by a large number of vertical velocity-curves. The coefficient deduced from a single curve is rarely applicable to the entire cross-section of the stream. The coefficients as determined by vertical velocity-curves for reducing the velocity by either of the other point methods to mean velocity may be plotted with stage as the other ordinate and thus determine a curve which may define the coefficient to be used at any stage. The.6 depth method.--In practical measurement of stream discharge it is necessary to determine the horizontal velocity in a large number of 50 60 70 80 9tl 100 110 120 130 Velocity in terms of mean velocity= 100. Fig. 11.--Mean Vertical Velocity-Curves for New York and Connecticut Rivers. verticals. Therefore, a method must be used which requires not more than three velocity observations in each vertical. If one point is used it is desirable that it be in such position that the use of a coefficient js not necessary to determine the mean velocity. The foregoing theory shows that such a point lies approximately at.6 depth of the stream. The preceding table shows that the thread of mean velocity lies between 56 per cent and73 per cent of the depth, with an average of 61 per cent. The error resulting from the use of.6 depth is very small, ranging from--6 per cent to + 4 per cent, with a mean of 0 per cent. Therefore, in the.6 depth method it is assumed that the velocity at.6 depth is the mean velocity in the vertical and the meter...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236523814
  • 9781236523815