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dc.contributor.authorHussein, Janeten_US
dc.contributor.authorTruong, Paulen_US
dc.contributor.authorGhadiri, Hosseinen_US
dc.contributor.authorYu, Bofuen_US
dc.contributor.authorRose, Calvinen_US
dc.date.accessioned2017-04-24T08:27:52Z
dc.date.available2017-04-24T08:27:52Z
dc.date.issued2006en_US
dc.date.modified2008-01-17T08:27:46Z
dc.identifier.doihttp://www.vetiver.org/ICV4pdfs/BA07.pdfen_AU
dc.identifier.urihttp://hdl.handle.net/10072/13337
dc.description.abstractVetiver buffer strips are widely employed to reduce fluxes of eroding soil and associated nutrients and pollutants from catchments into waterways. The physical processes involved in sediment reduction by buffer strips have been examined in a number of studies and various models have been developed to describe some of these processes. However, the sedimentremoval efficiency is complex as it is time-dependent and changes as deposition builds up and existing models do not allow for this, amongst other limitations. A new model, the Griffith University Soil Erosion & Deposition - Vegetative Buffer Strip Model (GUSED-VBS), has therefore been developed which couples the hydraulics, sediment deposition and subsequent adjustment to bed topography, to simulate the build-up of sediments in the backwater zone and its effect on flow conditions. The model can be used to predict sediment retention by buffers as well as sediment concentrations, size distributions and nutrient enrichment ratios of runoff. Experiments to characterize sediment and nutrient retention by a vetiver strip were carried out using surface flow in the Griffith University Tilting-Flume Simulated Rainfall facility and were later used to test the model. Replicate experiments were conducted at three slopes using a dense vetiver strip inserted into the flume. Water profiles were recorded, then sediment comprising either a sandy soil (Podzol), a red clay (Ferralsol) or a black clay (Vertisol) was introduced into flow upstream of the buffer and sediment deposition and outflow characteristics were measured for each soil. Total carbon, nitrogen and phosphorous levels were determined in different size fractions of each sediment, to characterize nutrient enrichment. Sediment loads in the outflow increased slightly with time for the Vertisol due to sediment movement into the buffer but were static for the other two soils. The buffering action of the vetiver was efficient, reducing sediment in the outflow to 3.2, 6.0 and 11.3 % of the inflow concentration for the Podzol, Ferrosol and Vertosol respectively, with a significant differences (P<0.01) between soils. Sediments in the runoff were primarily in the 0.002 - 0.2mm size range and the greatest enrichment of fines (silt size or smaller) occurred in the Ferralsol and Vertisol. Particulate-carbon, -nitrogen and -phosphorous levels in the outflow were reduced by more than 60% compared to the inflow. Measured data from the flume experiments were compared to simulated data from GUSED-VBS. Water profiles and total sediment deposition were simulated well with low root mean square errors and coefficients of efficiency approaching 1. Reductions of the inflow nutrient loads were fairly well simulated. Further work is underway to test the model using field data.en_US
dc.description.publicationstatusYesen_AU
dc.format.extent229105 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherVetiver Internationalen_US
dc.publisher.placeCaracas, Venezuelaen_US
dc.publisher.urihttp://www.vetiver.org/en_AU
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofconferencename4th International Vetiver Conference: Vetiver and Peopleen_US
dc.relation.ispartofconferencetitleProceedings of 4th International Vetiver Conference: Vetiver and Peopleen_US
dc.relation.ispartofdatefrom2006-10-01en_US
dc.relation.ispartofdateto2006-10-05en_US
dc.relation.ispartoflocationYangling, Chinaen_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchcode300105en_US
dc.titleVetiver buffer strips: modelling their effect on sediment and nutrient reduction from surface flowen_US
dc.typeConference outputen_US
dc.type.descriptionE2 - Conference Publications (Non HERDC Eligible)en_US
dc.type.codeE - Conference Publicationsen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.rights.copyrightCopyright 2006 authors. The attached file is posted here with permission of the copyright owners for your personal use only. No further distribution permitted.en_AU
gro.date.issued2006
gro.hasfulltextFull Text


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    Contains papers delivered by Griffith authors at national and international conferences.

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