Show simple item record

dc.contributorVirginia Techen
dc.contributor.authorPaiva, Emcden
dc.contributor.authorHeatwole, Conrad D.en
dc.contributor.authorPaiva, J. B. D.en
dc.contributor.authorPaiva, R. C. D.en
dc.contributor.authorBeling, F. A.en
dc.date.accessioned2014-05-30T13:13:44Zen
dc.date.available2014-05-30T13:13:44Zen
dc.date.issued2013en
dc.identifier.citationPaiva, Emcd; Heatwole, C. D.; Paiva, J. B. D.; Paiva, R. C. D.; Beling, F. A., "Trends in streamflow in the Ibicui River Basin, Brazil: influence of rice crop irrigation," Transactions of the ASABE. 56(6): 1371-1375. (doi: 10.13031/trans.56.9953) @2013en
dc.identifier.issn2151-0032en
dc.identifier.urihttp://hdl.handle.net/10919/48191en
dc.description.abstractThe Ibicui River basin in Rio Grande do Sul, Brazil, has recurring problems of water deficits, commonly attributed to the indiscriminate use of water to irrigate rice. The objective of this study was a statistical analysis of water flow data in the Ibicui basin to verify if significant trends in water availability are related to the withdrawal of water for rice crop irrigation. We used data from 11 fluviometric stations for 1970 to 2011, which corresponds to the period of major expansion in rice cultivation in the basin. Daily flows were normalized, and for each month the flow rate was calculated for durations from 50% to 99%. Trends in these series were evaluated using the Mann-Kendall test. Results show that over the 40-year period of study there are trends of increasing water flow for eight of the 11 stations, and at six of those eight stations the increasing trend was statistically significant In a river with sequential stations, differences between the stations indicated a decreasing trend for durations >80% as reflected by the Mann-Kendall Z(s). However, the primary analysis failed to show trends that might reflect increasing irrigation withdrawals. Thus, contrary to expectations, we conclude that, for the Ibicui basin, analysis of trends in the flow data does not clearly implicate water withdrawals for rice irrigation as the reason for water deficits.en
dc.description.sponsorshipCAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior)en
dc.description.sponsorshipUFSM (Universidade Federal de Santa Maria)en
dc.description.sponsorshipVirginia Agricultural Experiment Station (Hatch Project S1042)en
dc.format.mimetypeapplication/pdfen
dc.language.isoen_USen
dc.publisherAmerican Society of Agricultural and Biological Engineersen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFlow durationen
dc.subjectMann-Kendall testen
dc.subjectRice irrigationen
dc.subjectTrend analysisen
dc.subjectWateren
dc.subjectWithdrawalen
dc.subjectAgricultureen
dc.titleTrends in streamflow in the Ibicui River Basin, Brazil: influence of rice crop irrigationen
dc.typeArticle - Refereeden
dc.contributor.departmentBiological Systems Engineeringen
dc.identifier.urlhttp://elibrary.asabe.org/abstract.asp?aid=44148&t=3&dabs=Y&redir=&redirType=en
dc.date.accessed2014-05-29en
dc.title.serialTransactions of the ASABEen
dc.identifier.doihttps://doi.org/10.13031/trans.56.9953en
dc.type.dcmitypeTexten


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record