dc.contributor | Nouwakpo, Sayjro | en_US |
dc.contributor | Huang, Chi | en_US |
dc.contributor | Klik, Andreas | en_US |
dc.creator | Strohmeier, Stefan | en_US |
dc.date.accessioned | 2017-07-24T01:46:50Z | |
dc.date.available | 2017-07-24T01:46:50Z | |
dc.identifier | https://mel.cgiar.org/dspace/limited | en_US |
dc.identifier.citation | Stefan Strohmeier, Sayjro Nouwakpo, Chi Huang, Andreas Klik. (28/7/2014). Flume experimental evaluation of the effect of rill flow path tortuosity on rill roughness based on the Manning–Strickler equatio. CATENA, 118, pp. 226-233. | en_US |
dc.identifier.uri | https://hdl.handle.net/20.500.11766/7340 | |
dc.description.abstract | Numerous soil erosion models compute concentrated flow hydraulics based on the Manning–Strickler equation
(v = kSt R2/3 I1/2) even though the range of the application on rill flow is unclear. Unconfined rill morphologies
generate local friction effects and consequently spatially variable rill roughness which is in conflict with the
assumptions of (sectional) uniform channel flow and constant channel roughness of the Manning–Strickler
equation.
The objective of this study is to evaluate the effect of rill morphology on roughness and hence to assess the
Manning–Strickler roughness coefficient (kSt) by rill morphological data. A laboratory experiment was set up
to analyse rill hydraulics and roughness of I.) Free Developed Rill (FDR) flows and II.) Straight Constrained Rill
(SCR) flows in the flume. The flume experiment generated Manning–Strickler roughness coefficients (kSt) between
22 m1/3 s−1 and 44 m1/3 s−1 reflecting a potential area of the roughness parameter uncertainty. It was
found that FDR experiments generated significantly lower kSt values compared to SCR experiments, because
skin and local friction effects in the FDR experiments were more efficient reducing flow velocity probably due
to higher energy dissipation. Rill flow path tortuosity (Tort) was used to describe the rill morphology of the experiments
and correlation statistics between Tort and kSt identified considerable explanatory capacity of rill
flow path tortuosity on rill roughness. The flume study demonstrated that a regression model between Tort
and kSt can be used to assess local friction effects of unconfined rill morphologies and hence to reduce the area
of uncertainty of the Manning–Strickler roughness parameter | en_US |
dc.format | PDF | en_US |
dc.language | en | en_US |
dc.publisher | Elsevier | en_US |
dc.source | CATENA;118,(2014) Pagination 226-233 | en_US |
dc.subject | rill morphology | en_US |
dc.subject | manning–strickler roughness | en_US |
dc.subject | flume experiment | en_US |
dc.title | Flume experimental evaluation of the effect of rill flow path tortuosity on rill roughness based on the Manning–Strickler equatio | en_US |
dc.type | Journal Article | en_US |
dcterms.available | 2014-07-28 | en_US |
dcterms.extent | 226-233 | en_US |
cg.creator.id | Strohmeier, Stefan: 0000-0003-0723-5964 | en_US |
cg.subject.agrovoc | rill erosion | en_US |
cg.contributor.center | University of Natural Resources and Life Sciences, Center for Development Research - BOKU - CDR | en_US |
cg.contributor.center | United States Department of Agriculture, Agricultural Research Service - USDA-ARS | en_US |
cg.contributor.center | University of Nevada-Reno - UNR | en_US |
cg.contributor.center | University of Natural Resources and LIfe Science - BOKU | en_US |
cg.contributor.crp | CGIAR Research Program on Dryland Systems - DS | en_US |
cg.contributor.funder | International Center for Agricultural Research in the Dry Areas - ICARDA | en_US |
cg.contributor.project | Communication and Documentation Information Services (CODIS) | en_US |
cg.contributor.project-lead-institute | International Center for Agricultural Research in the Dry Areas - ICARDA | en_US |
cg.date.embargo-end-date | 2114-07-28 | en_US |
cg.coverage.region | Northern America | en_US |
cg.coverage.country | US | en_US |
cg.contact | stefan.strohmeier@boku.ac.at | en_US |
cg.identifier.doi | https://dx.doi.org/10.1016/j.catena.2014.01.011 | en_US |
cg.isijournal | ISI Journal | en_US |
dc.identifier.status | Limited access | en_US |
mel.impact-factor | 3.191 | en_US |
cg.issn | 0341-8162 | en_US |
cg.journal | CATENA | en_US |
cg.volume | 118 | en_US |