Debris-Blocking Sensitivity of Piano Key Weirs under Reservoir-Type Approach Flow
AbstractThe collection of floating woody debris at flow control structures, such as spillways and weirs, can potentially result in reduced discharge efficiency (higher upstream head for a given weir discharge). Compared to less hydraulically-efficient control structures, piano key weirs have higher...
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| Veröffentlicht in: | Journal of hydraulic engineering (New York, N.Y.) N.Y.), 2013-11, Vol.139 (11), p.1134-1141 |
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| container_title | Journal of hydraulic engineering (New York, N.Y.) |
| container_volume | 139 |
| creator | Pfister, Michael Capobianco, Damiano Tullis, Blake Schleiss, Anton J |
| description | AbstractThe collection of floating woody debris at flow control structures, such as spillways and weirs, can potentially result in reduced discharge efficiency (higher upstream head for a given weir discharge). Compared to less hydraulically-efficient control structures, piano key weirs have higher discharge efficiency (lower upstream heads for a given discharge), which may increase the likelihood of woody debris collection. A systematic laboratory study was conducted to evaluate the interaction between various piano key weir geometries and woody debris types and sizes. The results of individual (noncumulative) debris tests indicated that floating debris blockage probability is highly influenced by trunk diameter and upstream head. The effects of debris accumulation on the upstream head varied with the value of the debris-free reference upstream head condition. At lower upstream reference head values, the cumulative debris tests indicated a relative increase of the debris-associated upstream head of approximately 70%; higher upstream reference head values produced upstream head increases limited to approximately 20%. |
| doi_str_mv | 10.1061/(ASCE)HY.1943-7900.0000780 |
| format | Article |
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Compared to less hydraulically-efficient control structures, piano key weirs have higher discharge efficiency (lower upstream heads for a given discharge), which may increase the likelihood of woody debris collection. A systematic laboratory study was conducted to evaluate the interaction between various piano key weir geometries and woody debris types and sizes. The results of individual (noncumulative) debris tests indicated that floating debris blockage probability is highly influenced by trunk diameter and upstream head. The effects of debris accumulation on the upstream head varied with the value of the debris-free reference upstream head condition. 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Compared to less hydraulically-efficient control structures, piano key weirs have higher discharge efficiency (lower upstream heads for a given discharge), which may increase the likelihood of woody debris collection. A systematic laboratory study was conducted to evaluate the interaction between various piano key weir geometries and woody debris types and sizes. The results of individual (noncumulative) debris tests indicated that floating debris blockage probability is highly influenced by trunk diameter and upstream head. The effects of debris accumulation on the upstream head varied with the value of the debris-free reference upstream head condition. At lower upstream reference head values, the cumulative debris tests indicated a relative increase of the debris-associated upstream head of approximately 70%; higher upstream reference head values produced upstream head increases limited to approximately 20%.</description><subject>Applied sciences</subject><subject>Buildings. Public works</subject><subject>Collection</subject><subject>Debris</subject><subject>Discharge</subject><subject>Efficiency</subject><subject>Exact sciences and technology</subject><subject>Floating structures</subject><subject>Hydraulic constructions</subject><subject>Pianos</subject><subject>River flow control. 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Public works</topic><topic>Collection</topic><topic>Debris</topic><topic>Discharge</topic><topic>Efficiency</topic><topic>Exact sciences and technology</topic><topic>Floating structures</topic><topic>Hydraulic constructions</topic><topic>Pianos</topic><topic>River flow control. Flood control</topic><topic>Technical Papers</topic><topic>Upstream</topic><topic>Weirs</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pfister, Michael</creatorcontrib><creatorcontrib>Capobianco, Damiano</creatorcontrib><creatorcontrib>Tullis, Blake</creatorcontrib><creatorcontrib>Schleiss, Anton J</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aqualine</collection><collection>Environment Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Journal of hydraulic engineering (New York, N.Y.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pfister, Michael</au><au>Capobianco, Damiano</au><au>Tullis, Blake</au><au>Schleiss, Anton J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Debris-Blocking Sensitivity of Piano Key Weirs under Reservoir-Type Approach Flow</atitle><jtitle>Journal of hydraulic engineering (New York, N.Y.)</jtitle><date>2013-11-01</date><risdate>2013</risdate><volume>139</volume><issue>11</issue><spage>1134</spage><epage>1141</epage><pages>1134-1141</pages><issn>0733-9429</issn><eissn>1943-7900</eissn><coden>JHEND8</coden><abstract>AbstractThe collection of floating woody debris at flow control structures, such as spillways and weirs, can potentially result in reduced discharge efficiency (higher upstream head for a given weir discharge). Compared to less hydraulically-efficient control structures, piano key weirs have higher discharge efficiency (lower upstream heads for a given discharge), which may increase the likelihood of woody debris collection. A systematic laboratory study was conducted to evaluate the interaction between various piano key weir geometries and woody debris types and sizes. The results of individual (noncumulative) debris tests indicated that floating debris blockage probability is highly influenced by trunk diameter and upstream head. The effects of debris accumulation on the upstream head varied with the value of the debris-free reference upstream head condition. At lower upstream reference head values, the cumulative debris tests indicated a relative increase of the debris-associated upstream head of approximately 70%; higher upstream reference head values produced upstream head increases limited to approximately 20%.</abstract><cop>Reston, VA</cop><pub>American Society of Civil Engineers</pub><doi>10.1061/(ASCE)HY.1943-7900.0000780</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0733-9429 |
| ispartof | Journal of hydraulic engineering (New York, N.Y.), 2013-11, Vol.139 (11), p.1134-1141 |
| issn | 0733-9429 1943-7900 |
| language | eng |
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| source | American Society of Civil Engineers:NESLI2:Journals:2014 |
| subjects | Applied sciences Buildings. Public works Collection Debris Discharge Efficiency Exact sciences and technology Floating structures Hydraulic constructions Pianos River flow control. Flood control Technical Papers Upstream Weirs |
| title | Debris-Blocking Sensitivity of Piano Key Weirs under Reservoir-Type Approach Flow |
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