On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining
Sand mining in an active alluvial channel can compromise the streambed stability of the hydraulic structures nearby. This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excav...
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| Veröffentlicht in: | Water (Basel) 2019-08, Vol.11 (8), p.1676 |
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| creator | Lade, Abhijit D. Deshpande, Vishal Kumar, Bimlesh Oliveto, Giuseppe |
| description | Sand mining in an active alluvial channel can compromise the streambed stability of the hydraulic structures nearby. This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. The results are then compared to a case having only the piers without any mining pit. Turbulent stresses and mean velocities in the near-bed region rise significantly at the upstream region of the piers in the presence of a pit. Also, stronger flow reversal and horseshoe vortices have been detected at the base of the pier front. Due to these alterations in the nature of turbulence, erosion of channel beds upstream of the piers, increased scour depths, scour volume, and lateral erosion of the scour hole have been observed. Dynamic evolution of the local scour at various time scales has been studied using a wavelet cross-correlation method. Spatial evolution of local scour is found to be faster when a pit is excavated in the channel. Thus, mining activities near the piers can lead to significant changes in the flow-field, causing excessive scour around piers. |
| doi_str_mv | 10.3390/w11081676 |
| format | Article |
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This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. The results are then compared to a case having only the piers without any mining pit. Turbulent stresses and mean velocities in the near-bed region rise significantly at the upstream region of the piers in the presence of a pit. Also, stronger flow reversal and horseshoe vortices have been detected at the base of the pier front. Due to these alterations in the nature of turbulence, erosion of channel beds upstream of the piers, increased scour depths, scour volume, and lateral erosion of the scour hole have been observed. Dynamic evolution of the local scour at various time scales has been studied using a wavelet cross-correlation method. Spatial evolution of local scour is found to be faster when a pit is excavated in the channel. Thus, mining activities near the piers can lead to significant changes in the flow-field, causing excessive scour around piers.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w11081676</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Alluvial channels ; Bridge piers ; Bridges ; Channel erosion ; Cross correlation ; Experiments ; Fluid dynamics ; Fluid flow ; Horseshoe vortices ; Hydraulic structures ; Piers ; Reynolds number ; River beds ; Rivers ; Sand ; Sand & gravel ; Scour ; Scouring ; Sediments ; Streambeds ; Structural stability ; Upstream</subject><ispartof>Water (Basel), 2019-08, Vol.11 (8), p.1676</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 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This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. The results are then compared to a case having only the piers without any mining pit. Turbulent stresses and mean velocities in the near-bed region rise significantly at the upstream region of the piers in the presence of a pit. Also, stronger flow reversal and horseshoe vortices have been detected at the base of the pier front. Due to these alterations in the nature of turbulence, erosion of channel beds upstream of the piers, increased scour depths, scour volume, and lateral erosion of the scour hole have been observed. Dynamic evolution of the local scour at various time scales has been studied using a wavelet cross-correlation method. Spatial evolution of local scour is found to be faster when a pit is excavated in the channel. Thus, mining activities near the piers can lead to significant changes in the flow-field, causing excessive scour around piers.</description><subject>Alluvial channels</subject><subject>Bridge piers</subject><subject>Bridges</subject><subject>Channel erosion</subject><subject>Cross correlation</subject><subject>Experiments</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Horseshoe vortices</subject><subject>Hydraulic structures</subject><subject>Piers</subject><subject>Reynolds number</subject><subject>River beds</subject><subject>Rivers</subject><subject>Sand</subject><subject>Sand & gravel</subject><subject>Scour</subject><subject>Scouring</subject><subject>Sediments</subject><subject>Streambeds</subject><subject>Structural stability</subject><subject>Upstream</subject><issn>2073-4441</issn><issn>2073-4441</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpNUE1LAzEUDKJgqT34DwKePKy-fO1mj7VoLbTUg548LNvN2zalTWqyi_TfG62I7zJvhpn3YAi5ZnAnRAn3n4yBZnmRn5EBh0JkUkp2_m-_JKMYt5BGllorGJD3paPdBunCh8PGm6Or97ah412Hoe6sd5HWwffO0IdgzRrpi8UQaRIw_ORmrt316Bqkvk0kdgHrPV1YZ936ily09S7i6BeH5O3p8XXynM2X09lkPM8aXvIua5RspNbABXCjkClosDAIvMRSaQOSG5PnuS65UiLhSrWFAeA14yuttRRDcnO6ewj-o8fYVVvfB5deVikCsuCyFMl1e3I1wccYsK0Owe7rcKwYVN_1VX_1iS_oOGAS</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Lade, Abhijit D.</creator><creator>Deshpande, Vishal</creator><creator>Kumar, Bimlesh</creator><creator>Oliveto, Giuseppe</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><orcidid>https://orcid.org/0000-0002-1318-2988</orcidid><orcidid>https://orcid.org/0000-0001-6001-8411</orcidid></search><sort><creationdate>20190801</creationdate><title>On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining</title><author>Lade, Abhijit D. ; Deshpande, Vishal ; Kumar, Bimlesh ; Oliveto, Giuseppe</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c292t-c54c48802302d5e150ce7de029e958d042dd666892553668b5f7d002a12b88843</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Alluvial channels</topic><topic>Bridge piers</topic><topic>Bridges</topic><topic>Channel erosion</topic><topic>Cross correlation</topic><topic>Experiments</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Horseshoe vortices</topic><topic>Hydraulic structures</topic><topic>Piers</topic><topic>Reynolds number</topic><topic>River beds</topic><topic>Rivers</topic><topic>Sand</topic><topic>Sand & gravel</topic><topic>Scour</topic><topic>Scouring</topic><topic>Sediments</topic><topic>Streambeds</topic><topic>Structural stability</topic><topic>Upstream</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lade, Abhijit D.</creatorcontrib><creatorcontrib>Deshpande, Vishal</creatorcontrib><creatorcontrib>Kumar, Bimlesh</creatorcontrib><creatorcontrib>Oliveto, Giuseppe</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Water (Basel)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lade, Abhijit D.</au><au>Deshpande, Vishal</au><au>Kumar, Bimlesh</au><au>Oliveto, Giuseppe</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining</atitle><jtitle>Water (Basel)</jtitle><date>2019-08-01</date><risdate>2019</risdate><volume>11</volume><issue>8</issue><spage>1676</spage><pages>1676-</pages><issn>2073-4441</issn><eissn>2073-4441</eissn><abstract>Sand mining in an active alluvial channel can compromise the streambed stability of the hydraulic structures nearby. This experimental study is aimed at investigating the effects of rectangular mining pit on the morphodynamics around circular tandem piers in a movable bed. A rectangular pit is excavated upstream of two circular piers embedded in the sand-bed in a tandem arrangement. The results are then compared to a case having only the piers without any mining pit. Turbulent stresses and mean velocities in the near-bed region rise significantly at the upstream region of the piers in the presence of a pit. Also, stronger flow reversal and horseshoe vortices have been detected at the base of the pier front. Due to these alterations in the nature of turbulence, erosion of channel beds upstream of the piers, increased scour depths, scour volume, and lateral erosion of the scour hole have been observed. Dynamic evolution of the local scour at various time scales has been studied using a wavelet cross-correlation method. 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| source | MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Alluvial channels Bridge piers Bridges Channel erosion Cross correlation Experiments Fluid dynamics Fluid flow Horseshoe vortices Hydraulic structures Piers Reynolds number River beds Rivers Sand Sand & gravel Scour Scouring Sediments Streambeds Structural stability Upstream |
| title | On the Morphodynamic Alterations around Bridge Piers under the Influence of Instream Mining |
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