Effect of Nonuniformity of Flow on Hydraulic Geometry Relations
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 9
Abstract
The effect of nonuniformity of flow on hydraulic geometry relations is investigated. Using data from a historic channel in Isfahan, central Iran, which was constructed 400 years ago, it is found that the nonuniformity of flow significantly influences the prediction of depth and velocity. However, flow nonuniformity reveals less effect on the prediction of slope due to nonlinear shear stress distribution. It is considered that under the uniform flow assumption , depth and slope acting as dependent and independent variables, respectively, result in spurious correlation. However, the depth equation reveals this is not a correct conclusion because is not large and the exponent of is quite small. Likewise, although the Shields parameter is among the controlling variables for the prediction slope, its application under the uniform flow assumption has a risk of spurious correlation.
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© 2009 ASCE.
History
Received: Feb 19, 2008
Accepted: Feb 3, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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