Effects of cypress knee roughness on flow resistance and discharge estimates of the Turkey Creek watershed

  • Authors: Miroslaw-Swiatek, Dorota; Amatya, Devendra M.
  • Publication Year: 2017
  • Publication Series: Scientific Journal (JRNL)
  • Source: Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation
  • DOI: 10.1515/sggw-2017-0015

Abstract

Effects of cypress knee roughness on flow resistance and discharge estimates of the Turkey Creek watershed. In this study effects of cypress knees as vegetation resistance factor on Turkey Creek watershed discharge calculation were analyzed. The Turkey Creek watershed is a 3rd order stream system draining an approximate area of 5,240 ha. It is located at 33°08' N latitude and 79°47' W longitude, approximately 60 km north-west of City of Charleston in South Carolina (USA). Turkey Creek (WS 78) is typical of other watersheds in the south Atlantic coastal plain. In the case of Turkey Creek watershed, one of the main channels and riparian floodplain vegetation contains cypress trees. Cypress trees live in moist or swampy regions along the Atlantic coastal plain. The cypress trees are characterized by the unique root system called knees that appear just above the water line, up to 1.2 m above water surface. This study is conducted to examine the effects of roughness of cypress knee as related to its shape (diameter and height) on discharge estimates of the Turkey Creek watershed. Hydraulic characteristics of the cypress knees were determined by field inventory in selected cross-section along the main stream channel. The Pasche method was used to calculate the total Darcy–Weisbach friction factor in discharge capacity calculation of the study watershed. The results of this study show that the effect of vegetation shape in the Pasche approach is significant. If the variability of vegetation stem diameter is taken into consideration in the calculations, an increase by 10–32% in the values of friction coefficients occurs.

  • Citation: Miroslaw-Swiatek, Dorota; Amatya, Devendra M. 2017. Effects of cypress knee roughness on flow resistance and discharge estimates of the Turkey Creek watershed. Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation. 49(3): 179-199. https://doi.org/10.1515/sggw-2017-0015.
  • Keywords: South Carolina, Francis Marion National Forest, Discharge Calculation, Riparian Floodplain, Roughness Coefficient, Hydraulic Resistance, Pasche Method
  • Posted Date: September 18, 2018
  • Modified Date: September 21, 2018
  • Requesting Print Publications

    Publication requests are subject to availability. Fiscal responsibility limits the hardcopies of publications we produce and distribute. Electronic versions of publications may be downloaded, distributed and printed.

    Please make any requests at pubrequest@fs.fed.us.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.