Refinement of the Fread Method for Improved Tracking of Stream Discharges during Unsteady Flows

Kyutae Lee; Marian Muste

doi:10.1061/(ASCE)HY.1943-7900.0001280

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Refinement of the Fread Method for Improved Tracking of Stream Discharges during Unsteady Flows

Journal article

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Refinement of the Fread Method for Improved Tracking of Stream Discharges during Unsteady Flows

Kyutae Lee and Marian Muste

Journal of hydraulic engineering (New York, N.Y.), Vol.143(6), 06017003

06/01/2017

DOI: 10.1061/(ASCE)HY.1943-7900.0001280

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https://www.osti.gov/biblio/1343497View

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Abstract

There are a plethora of analytical methods that can account for the effect of unsteady flow (i.e., hysteretic behavior) on steady-state stage-discharge rating curves (hQRCs) used to continuously estimate discharge in open-channel flow. One of the most complete and accurate methods for wide rectangular channels is the Fread method. This paper presents an extension of the method that can be applicable to arbitrary geometry of the channel cross section by replacing the hydraulic depth with the hydraulic radius and adjusting formulations associated with wave celerity coefficient and kinematic wave equation in the original Fread method. The modified Fread method improves the accuracy associated with the estimation of conveyance factor and energy slope. It is particularly useful for low-aspect-ratio (i.e., the width-to-depth ratio) channels where the original method's assumption does not properly hold. These improvements are tested at two sites, each representative of small streams and midsize rivers, to quantitatively illustrate the significance and performance of the refined method. (C) 2017 American Society of Civil Engineers.

Engineering

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Engineering, Mechanical

Physical Sciences

Science & Technology

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Water Resources

Details

Title: Subtitle: Refinement of the Fread Method for Improved Tracking of Stream Discharges during Unsteady Flows
Creators: Kyutae Lee - Oak Ridge National Laboratory
Marian Muste - University of Iowa
Resource Type: Journal article
Publication Details: Journal of hydraulic engineering (New York, N.Y.), Vol.143(6), 06017003
DOI: 10.1061/(ASCE)HY.1943-7900.0001280
ISSN: 0733-9429
eISSN: 1943-7900
Publisher: Asce-Amer Soc Civil Engineers
Number of pages: 10
Grant note: 11-TI-C06 / Ministry of Land, Infrastructure and Transport (Korea) Iowa Flood Center (IFC) at the University of Iowa
Language: English
Date published: 06/01/2017
Academic Unit: IIHR--Hydroscience and Engineering; Geographical and Sustainability Sciences
Record Identifier: 9984460324202771

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