The University of Southampton
University of Southampton Institutional Repository

Friction correction factors for center-pivots

Friction correction factors for center-pivots
Friction correction factors for center-pivots
Analytical equations for friction correction factors for center-pivot laterals without end guns are developed. This work illustrates a discrepancy when earlier equations are applied to center-pivots with small numbers of outlets. Earlier equations were also limited to center-pivots with constant outlet spacing. Equations presented in the current work are developed for center-pivots with constant outlet spacing and also for center-pivots with constant outlet discharge. When the equations developed in the current work are applied to center-pivots with a large number of outlets, the results are in good agreement with previous work for center-pivot laterals with an infinite number of outlets. When applied to smaller number of outlets the equations presented here provide a more precise estimate of the friction correction factor. Using the current equations, the friction correction factor for center-pivots with constant outlet spacing was found to be very similar to the friction correction factor for center-pivots with constant outlet discharge. Useful simple equations are also presented for calculating the discharge of each outlet or for calculating the spacing between outlets.
0733-9437
280-286
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31

Anwar, Arif A. (1999) Friction correction factors for center-pivots. Journal of Irrigation and Drainage Engineering, ASCE, 125 (5), 280-286. (doi:10.1061/(ASCE)0733-9437(1999)125:5(280)).

Record type: Article

Abstract

Analytical equations for friction correction factors for center-pivot laterals without end guns are developed. This work illustrates a discrepancy when earlier equations are applied to center-pivots with small numbers of outlets. Earlier equations were also limited to center-pivots with constant outlet spacing. Equations presented in the current work are developed for center-pivots with constant outlet spacing and also for center-pivots with constant outlet discharge. When the equations developed in the current work are applied to center-pivots with a large number of outlets, the results are in good agreement with previous work for center-pivot laterals with an infinite number of outlets. When applied to smaller number of outlets the equations presented here provide a more precise estimate of the friction correction factor. Using the current equations, the friction correction factor for center-pivots with constant outlet spacing was found to be very similar to the friction correction factor for center-pivots with constant outlet discharge. Useful simple equations are also presented for calculating the discharge of each outlet or for calculating the spacing between outlets.

Full text not available from this repository.

More information

Published date: September 1999

Identifiers

Local EPrints ID: 74516
URI: http://eprints.soton.ac.uk/id/eprint/74516
ISSN: 0733-9437
PURE UUID: ca57e1b4-d3d2-4b32-8d93-d49c5b48642f
ORCID for Arif A. Anwar: ORCID iD orcid.org/0000-0002-3071-3197

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 07 Oct 2020 07:11

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×