Title page for ETD etd-04252012-092756


Type of Document Master's Thesis
Author Hall, Karen
URN etd-04252012-092756
Title Surface water flow resistance due to emergent wetland vegetation
Degree Master of Engineering
Department Biological Systems Engineering
Advisory Committee
Advisor Name Title
Thompson, Theresa Committee Chair
Diplas, Panayiotis Committee Member
Easton, Zachary Committee Member
Keywords
  • wetland
  • friction factor
  • resistance
  • flow
  • vegetation
Date of Defense 2012-04-11
Availability restricted
Abstract
The key to a successful wetland design is duplicating the hydroperiod of the

desired wetland type. Dense wetland vegetation affects surface water flow rates

by increasing flow resistance. Prior research represented the vegetation as

individual stems; however, many wetland species grow in clumps. Therefore,

the objectives of this study were to investigate the effect of clumping

vegetation on flow resistance and to develop a prediction equation for use in

wetland design. A 6-m by 1-m by 0.4-m recirculating flume was planted with

mature common rush, Juncus effusus, a common emergent wetland plant. Three

different flow rates (3, 4, and 5 L/s) and three different tailgate heights (0, 2.5,

and 5 cm) were used to simulate a variety of wetland conditions. Plant spacing

and clump diameter were varied (20 and 25 cm, 8 and 12 cm, respectively).

Friction factors ranged from 9 to 40 and decreased with increasing plant

density. Non-dimensional parameters determined through Buckingham Pi

analysis were used in a regression analysis to develop a prediction model.

Results of the regression analysis showed that the fraction of vegetated

occupied area (P) was most significant factor in determining friction factor.

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