Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach

Freek Huthoff; Dionysius C.M. Augustijn; J.H.A. Wijbenga; Suzanne J.M.H. Hulscher

Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach

Freek Huthoff, Dionysius C.M. Augustijn, J.H.A. Wijbenga, Suzanne J.M.H. Hulscher

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

The hydraulic resistance of vegetation can play a major role in the hydrodynamics of rivers with extensive natural floodplains. Contrary to commonly used wall roughness methods, vegetation penetrates the flow field and thereby causes drag and, subsequently, additional energy losses. In this study, these processes are treated in an idealized form by replacing vegetation with cylindrical elements with homogeneous geometrical dimensions. Based on scaling considerations of the forces involved, depth-averaged flow velocities within the roughness layer and in the free flowing layer above the roughness elements are estimated. Consequently, conditions in the two separate flow layers yield a new description of the overall average flow field, which is entirely determined by measurable geometrical boundaries. The new description shows to give good agreement with laboratory flume experiments.

Original language	Undefined
Title of host publication	NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht
Editors	H.J.T. Weerts, I.L Ritsema, A.G. van Os
Place of Publication	Delft
Publisher	NCR
Pages	63-64
Publication status	Published - 3 Nov 2006
Event	NCR-days 2005: Research on river dynamics from geological to operational time scales - Zwijndrecht, Netherlands Duration: 3 Nov 2005 → 4 Nov 2005

Publication series

Name	NCR publication 29-2005
Number	1568-234x

Conference

Conference	NCR-days 2005
Country/Territory	Netherlands
City	Zwijndrecht
Period	3/11/05 → 4/11/05

Keywords

IR-67910
METIS-233966

Access to Document

Huthoff05hydraulic

Cite this

Huthoff, F., Augustijn, D. C. M., Wijbenga, J. H. A., & Hulscher, S. J. M. H. (2006). Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach. In H. J. T. Weerts, I. L. Ritsema, & A. G. van Os (Eds.), NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht (pp. 63-64). (NCR publication 29-2005; No. 1568-234x). NCR.

Huthoff, Freek ; Augustijn, Dionysius C.M. ; Wijbenga, J.H.A. et al. / Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach. NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht. editor / H.J.T. Weerts ; I.L Ritsema ; A.G. van Os. Delft : NCR, 2006. pp. 63-64 (NCR publication 29-2005; 1568-234x).

@inproceedings{48a137f34cd74a33848fbe4f66c8686c,

title = "Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach",

abstract = "The hydraulic resistance of vegetation can play a major role in the hydrodynamics of rivers with extensive natural floodplains. Contrary to commonly used wall roughness methods, vegetation penetrates the flow field and thereby causes drag and, subsequently, additional energy losses. In this study, these processes are treated in an idealized form by replacing vegetation with cylindrical elements with homogeneous geometrical dimensions. Based on scaling considerations of the forces involved, depth-averaged flow velocities within the roughness layer and in the free flowing layer above the roughness elements are estimated. Consequently, conditions in the two separate flow layers yield a new description of the overall average flow field, which is entirely determined by measurable geometrical boundaries. The new description shows to give good agreement with laboratory flume experiments.",

keywords = "IR-67910, METIS-233966",

author = "Freek Huthoff and Augustijn, \{Dionysius C.M.\} and J.H.A. Wijbenga and Hulscher, \{Suzanne J.M.H.\}",

year = "2006",

month = nov,

day = "3",

language = "Undefined",

series = "NCR publication 29-2005",

publisher = "NCR",

number = "1568-234x",

pages = "63--64",

editor = "H.J.T. Weerts and I.L Ritsema and \{van Os\}, A.G.",

booktitle = "NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht",

note = "NCR-days 2005 ; Conference date: 03-11-2005 Through 04-11-2005",

}

Huthoff, F , Augustijn, DCM, Wijbenga, JHA & Hulscher, SJMH 2006, Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach. in HJT Weerts, IL Ritsema & AG van Os (eds), NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht. NCR publication 29-2005, no. 1568-234x, NCR, Delft, pp. 63-64, NCR-days 2005, Zwijndrecht, Netherlands, 3/11/05.

Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach. / Huthoff, Freek ; Augustijn, Dionysius C.M.; Wijbenga, J.H.A. et al.
NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht. ed. / H.J.T. Weerts; I.L Ritsema; A.G. van Os. Delft: NCR, 2006. p. 63-64 (NCR publication 29-2005; No. 1568-234x).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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T1 - Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach

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AU - Augustijn, Dionysius C.M.

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AU - Hulscher, Suzanne J.M.H.

PY - 2006/11/3

Y1 - 2006/11/3

N2 - The hydraulic resistance of vegetation can play a major role in the hydrodynamics of rivers with extensive natural floodplains. Contrary to commonly used wall roughness methods, vegetation penetrates the flow field and thereby causes drag and, subsequently, additional energy losses. In this study, these processes are treated in an idealized form by replacing vegetation with cylindrical elements with homogeneous geometrical dimensions. Based on scaling considerations of the forces involved, depth-averaged flow velocities within the roughness layer and in the free flowing layer above the roughness elements are estimated. Consequently, conditions in the two separate flow layers yield a new description of the overall average flow field, which is entirely determined by measurable geometrical boundaries. The new description shows to give good agreement with laboratory flume experiments.

AB - The hydraulic resistance of vegetation can play a major role in the hydrodynamics of rivers with extensive natural floodplains. Contrary to commonly used wall roughness methods, vegetation penetrates the flow field and thereby causes drag and, subsequently, additional energy losses. In this study, these processes are treated in an idealized form by replacing vegetation with cylindrical elements with homogeneous geometrical dimensions. Based on scaling considerations of the forces involved, depth-averaged flow velocities within the roughness layer and in the free flowing layer above the roughness elements are estimated. Consequently, conditions in the two separate flow layers yield a new description of the overall average flow field, which is entirely determined by measurable geometrical boundaries. The new description shows to give good agreement with laboratory flume experiments.

KW - IR-67910

KW - METIS-233966

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A2 - Weerts, H.J.T.

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A2 - van Os, A.G.

PB - NCR

CY - Delft

T2 - NCR-days 2005

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Huthoff F , Augustijn DCM, Wijbenga JHA, Hulscher SJMH. Hydraulic resistance of submerged cylindrical elements. A two layer scaling approach. In Weerts HJT, Ritsema IL, van Os AG, editors, NCR-days 2005. Research on river dynamics from geological to operational time scales. 3-5 November 2005, Zwijndrecht. Delft: NCR. 2006. p. 63-64. (NCR publication 29-2005; 1568-234x).