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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Theoretical Study on the Exponent in Basic Hydraulic Geometry Relation
Theoretical Study on the Exponent in Basic Hydraulic Geometry Relation
Author : Caian Huang, Xiaodong Zhao and Jiren Zhou
The exponent in basic hydraulic geometry relation (i.e., b \h=?) is discussed in this paper. For alluvial channel, the exponent usually take a fixed value at existing width-depth relations, for example, j=2\3 (Cao, 1996), and j=0.69 (Deng and Zhang, 1994). While for threshold channel, the exponent is unity, i.e., j=1 (USBR, 1951). So, the exponent should vary with flow intensity or sediment transport intensity. From the resistance equation and sediment transport equation, the principle of maximum entropy is used to explore how the discharge Q of regime channel adjusts impartially on its way concerning the variation of width and depth. The basic hydraulic geometry relation is derived, and its exponent is not a constant, but change with flow intensity. The exponent vary between 0.5~1.0, so this basic hydraulic geometry relation not only can summary the existing results, but also can unify the hydraulic geometry relation in static threshold channel and in dynamic alluvial channel.
File Size : 131,450 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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