02 September 2014
  Welcome Guest
  Login | Help
Home
 
General Information
Transaction Series
Related Information
Connect with WIT Press
Connect with WIT
Login
Login ID:
Password:
 
Your Cart
There are 0 items in your cart. [View]

Adobe PDF Reader is required to view our papers:
Get Acrobat Reader




  Welcome to the WIT eLibrary

The home of the Transactions of the Wessex Institute collection, providing on-line access to papers presented at the Institute's prestigious international conferences and from its State-of-the-Art in Science & Engineering publications.

Paper Information

Meandering effect for evaluation of roughness coefficients in open channel flow

Author(s): K. K. Khatua, K. C. Patra & P. Nayak

Abstract:
During uniform flow in an open channel, the resistance is dependent on a number of flow and geometrical parameters.

The usual practice in one dimensional flow analysis is to select an appropriate value of roughness coefficient for evaluating the carrying capacity of natural channel.

This value of roughness is taken as uniform for the entire surface and for all depths of flow. However, it is observed that the resistance coefficients for meandering channels are found to vary with flow depths, aspect ratio, slope and sinuosity and are all linked to the stage-discharge relationships.

Although much research has been done on Manning’s n for straight channels, a last word has not been spoken on the roughness values for meandering channels.

An investigation concerning the variation of roughness coefficients for meandering channels with slope, sinuosity and geometry are presented.

The loss of energy in terms of Darcy–Weisbach coefficient f is evaluated.

A simple equation for roughness coefficient based on dimensional analysis is modeled and tested with the recent experimental data. The method gives discharge results that are quite comparable to that of the observed values as well as with other published data.

Keywords:
aspect ratio, bed slope, boundary shear, Darcy–Weisbach coefficient, dimensional analysis, meandering channel, flow resistance, Sinuosity (Sr), stagedischarge relationship.

1 Introduction:
The energy loss in a meandering channel is influenced by the channel and flow parameters and is assumed to be lumped into a single value that is manifested in the form of a single resistance coefficient.

Wrong estimation of resistance coefficient can either underestimate or overestimate the discharge carrying ...

Pages: 12
Size: 998 kb
Paper DOI: 10.2495/RM110191

 

 

Download the Full Article

Price: US$ 30.00

You can purchase the full text version of this article in Adobe PDF format for the above price. Please click the 'Buy Paper' icon below to purchase this paper.

conference

Send this page to a friend. Send this page to a colleague.



This paper can be found in the following book

River Basin Management VI

River Basin Management VI

Buy Book from
Witpress.com



Download the Full Article

You can purchase the full text version of this article in Adobe PDF format for the price listed above. Please click the 'Buy Paper' icon to the right to purchase this paper.


Copyright© 2006 by WIT Press | About Prof Carlos Brebbia
Optimised for Microsoft Internet Explorer