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Evaluation of bendway weir bank stabilization techniques for stream restoration / Kumud Acharya in JRBM : International journal of river basin management, Vol. 10 N° 2 (Avril 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 2 (Avril 2012) . - pp. 171-176 Titre : Evaluation of bendway weir bank stabilization techniques for stream restoration Type de document : texte imprimé Auteurs : Kumud Acharya, Auteur ; Mahesh Gautam, Auteur Année de publication : 2012 Article en page(s) : pp. 171-176 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Streambank  stabilization  Restoration  Spur  dikes  Las  Vegas  wash Résumé : In this study, velocity distribution patterns in a stream in the presence of bendway weirs were assessed for their effectiveness in bank stabilization in a demonstration site in the Las Vegas Wash, Nevada, USA. Streambanks of the target stream had been stabilized previously by longitudinal stone toe protection (LSTP) and stone spur dikes. Stone toes are meant to protect the toe of streambanks. Similarly, stone spur dikes consist of a series of dikes (of a crest relatively higher than that of the bendway weirs) protruding at right angles from the convex side of the streambanks. Velocity measurements were taken to evaluate the velocity field in the channel in the following three different cases: Case 1, channel with LSTP and the pre-existing spur dikes; Case 2, channel with LSTP with no deflecting structures (spur dikes removed); and Case 3, channel with LSTP and bendway weirs. The results suggested that bendway weirs caused a reduction in the uncontrolled high-velocity flow near the outer bank (right bank), allowing only controlled flow. Thus, bendway weirs were found to be more effective than spur dikes in reducing the velocity of flow at the vulnerable weir zones near the outer banks, thus providing a means to stabilize the streambanks. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.679737 [article] Evaluation of bendway weir bank stabilization techniques for stream restoration [texte imprimé] / Kumud Acharya, Auteur ; Mahesh Gautam, Auteur . - 2012 . - pp. 171-176. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 2 (Avril 2012) . - pp. 171-176 Mots-clés : Streambank  stabilization  Restoration  Spur  dikes  Las  Vegas  wash Résumé : In this study, velocity distribution patterns in a stream in the presence of bendway weirs were assessed for their effectiveness in bank stabilization in a demonstration site in the Las Vegas Wash, Nevada, USA. Streambanks of the target stream had been stabilized previously by longitudinal stone toe protection (LSTP) and stone spur dikes. Stone toes are meant to protect the toe of streambanks. Similarly, stone spur dikes consist of a series of dikes (of a crest relatively higher than that of the bendway weirs) protruding at right angles from the convex side of the streambanks. Velocity measurements were taken to evaluate the velocity field in the channel in the following three different cases: Case 1, channel with LSTP and the pre-existing spur dikes; Case 2, channel with LSTP with no deflecting structures (spur dikes removed); and Case 3, channel with LSTP and bendway weirs. The results suggested that bendway weirs caused a reduction in the uncontrolled high-velocity flow near the outer bank (right bank), allowing only controlled flow. Thus, bendway weirs were found to be more effective than spur dikes in reducing the velocity of flow at the vulnerable weir zones near the outer banks, thus providing a means to stabilize the streambanks. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.679737