Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend
Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear s...
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| Veröffentlicht in: | Water (Basel) 2020-10, Vol.12 (10), p.2753 |
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| creator | Zhang, Liyuan Zhang, Faxing Cai, Ailing Song, Zhaoming Tong, Shilin |
| description | Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear stress estimations using the log-law method in a complex flow field were analyzed and compared with those associated with the Reynolds, Turbulent Kinetic Energy (TKE), and TKE-w′ methods. The results show that the TKE, Reynolds, and log-law methods produced similar bed shear stress estimates, while the TKE-w′ method produced larger estimates than the other methods. The TKE-w′ method was found to be more suitable for bed shear stress estimation than the TKE method, but the value of its constant C2 needed to be re-estimated. In a complex, strong, three-dimensional flow field, the height of the measurement point (relative or absolute) should be re-estimated when a single point measurement is used to estimate the bed shear stress. The results of this study provide guidance for experimental measurement of bed shear stress in a complex flow field. |
| doi_str_mv | 10.3390/w12102753 |
| format | Article |
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Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear stress estimations using the log-law method in a complex flow field were analyzed and compared with those associated with the Reynolds, Turbulent Kinetic Energy (TKE), and TKE-w′ methods. The results show that the TKE, Reynolds, and log-law methods produced similar bed shear stress estimates, while the TKE-w′ method produced larger estimates than the other methods. The TKE-w′ method was found to be more suitable for bed shear stress estimation than the TKE method, but the value of its constant C2 needed to be re-estimated. In a complex, strong, three-dimensional flow field, the height of the measurement point (relative or absolute) should be re-estimated when a single point measurement is used to estimate the bed shear stress. The results of this study provide guidance for experimental measurement of bed shear stress in a complex flow field.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w12102753</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Accuracy ; Experiments ; Flow velocity ; Fluid dynamics ; Fluvial sediments ; Geomorphology ; Image processing ; Kinetic energy ; Laboratories ; Laser discs ; Methods ; Noise ; Particle size ; Research methodology ; Sediment transport ; Sediments ; Shear stress ; Three dimensional flow</subject><ispartof>Water (Basel), 2020-10, Vol.12 (10), p.2753</ispartof><rights>COPYRIGHT 2020 MDPI AG</rights><rights>2020 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/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c331t-3cb7bce4720b05310a7016ff6ba5a1e696995e79825e370a76de66d67f55be743</citedby><cites>FETCH-LOGICAL-c331t-3cb7bce4720b05310a7016ff6ba5a1e696995e79825e370a76de66d67f55be743</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Zhang, Liyuan</creatorcontrib><creatorcontrib>Zhang, Faxing</creatorcontrib><creatorcontrib>Cai, Ailing</creatorcontrib><creatorcontrib>Song, Zhaoming</creatorcontrib><creatorcontrib>Tong, Shilin</creatorcontrib><title>Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend</title><title>Water (Basel)</title><description>Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear stress estimations using the log-law method in a complex flow field were analyzed and compared with those associated with the Reynolds, Turbulent Kinetic Energy (TKE), and TKE-w′ methods. The results show that the TKE, Reynolds, and log-law methods produced similar bed shear stress estimates, while the TKE-w′ method produced larger estimates than the other methods. The TKE-w′ method was found to be more suitable for bed shear stress estimation than the TKE method, but the value of its constant C2 needed to be re-estimated. In a complex, strong, three-dimensional flow field, the height of the measurement point (relative or absolute) should be re-estimated when a single point measurement is used to estimate the bed shear stress. The results of this study provide guidance for experimental measurement of bed shear stress in a complex flow field.</description><subject>Accuracy</subject><subject>Experiments</subject><subject>Flow velocity</subject><subject>Fluid dynamics</subject><subject>Fluvial sediments</subject><subject>Geomorphology</subject><subject>Image processing</subject><subject>Kinetic energy</subject><subject>Laboratories</subject><subject>Laser discs</subject><subject>Methods</subject><subject>Noise</subject><subject>Particle size</subject><subject>Research methodology</subject><subject>Sediment transport</subject><subject>Sediments</subject><subject>Shear stress</subject><subject>Three dimensional flow</subject><issn>2073-4441</issn><issn>2073-4441</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpNUE1PwzAMjRBITGMH_kEkThw68tEk63GbVkAa4jA4V2nrsExdM5JMg39PqiGEfbBlv_esZ4RuKZlyXpCHE2WUMCX4BRoxoniW5zm9_Ndfo0kIO5IiL2YzQUZos3T7g_Y2uB47g18gbl0bsHEeL6DFmy1ojzfRQwh4FaLd62gT1PZ4IHbwhcvOnXBpoWsHgQX07Q26MroLMPmtY_Rert6WT9n69fF5OV9nDec0ZrypVd1ArhipieCUaEWoNEbWWmgKspBFIUAVMyaAq7SVLUjZSmWEqEHlfIzuzroH7z6PEGK1c0ffp5MVEyJZlDKnCTU9oz50B5XtjYteNylb2NvG9WBsms9VQTllig-y92dC410IHkx18Mm3_64oqYY_V39_5j-C-WzS</recordid><startdate>20201001</startdate><enddate>20201001</enddate><creator>Zhang, Liyuan</creator><creator>Zhang, Faxing</creator><creator>Cai, Ailing</creator><creator>Song, Zhaoming</creator><creator>Tong, Shilin</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></search><sort><creationdate>20201001</creationdate><title>Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend</title><author>Zhang, Liyuan ; Zhang, Faxing ; Cai, Ailing ; Song, Zhaoming ; Tong, Shilin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c331t-3cb7bce4720b05310a7016ff6ba5a1e696995e79825e370a76de66d67f55be743</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Accuracy</topic><topic>Experiments</topic><topic>Flow velocity</topic><topic>Fluid dynamics</topic><topic>Fluvial sediments</topic><topic>Geomorphology</topic><topic>Image processing</topic><topic>Kinetic energy</topic><topic>Laboratories</topic><topic>Laser discs</topic><topic>Methods</topic><topic>Noise</topic><topic>Particle size</topic><topic>Research methodology</topic><topic>Sediment transport</topic><topic>Sediments</topic><topic>Shear stress</topic><topic>Three dimensional flow</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Liyuan</creatorcontrib><creatorcontrib>Zhang, Faxing</creatorcontrib><creatorcontrib>Cai, Ailing</creatorcontrib><creatorcontrib>Song, Zhaoming</creatorcontrib><creatorcontrib>Tong, Shilin</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>Zhang, Liyuan</au><au>Zhang, Faxing</au><au>Cai, Ailing</au><au>Song, Zhaoming</au><au>Tong, Shilin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend</atitle><jtitle>Water (Basel)</jtitle><date>2020-10-01</date><risdate>2020</risdate><volume>12</volume><issue>10</issue><spage>2753</spage><pages>2753-</pages><issn>2073-4441</issn><eissn>2073-4441</eissn><abstract>Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear stress estimations using the log-law method in a complex flow field were analyzed and compared with those associated with the Reynolds, Turbulent Kinetic Energy (TKE), and TKE-w′ methods. The results show that the TKE, Reynolds, and log-law methods produced similar bed shear stress estimates, while the TKE-w′ method produced larger estimates than the other methods. The TKE-w′ method was found to be more suitable for bed shear stress estimation than the TKE method, but the value of its constant C2 needed to be re-estimated. In a complex, strong, three-dimensional flow field, the height of the measurement point (relative or absolute) should be re-estimated when a single point measurement is used to estimate the bed shear stress. The results of this study provide guidance for experimental measurement of bed shear stress in a complex flow field.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/w12102753</doi><oa>free_for_read</oa></addata></record> |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute |
| subjects | Accuracy Experiments Flow velocity Fluid dynamics Fluvial sediments Geomorphology Image processing Kinetic energy Laboratories Laser discs Methods Noise Particle size Research methodology Sediment transport Sediments Shear stress Three dimensional flow |
| title | Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend |
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