RESPONSE OF SURFACE VELOCITY COEFFICIENT TO LONGITUDINAL BATHYMETRY VARIATION
The surface velocity coefficient is the value that converts the surface velocity into the depth-averaged velocity when observing the discharge, and 0.85 is treated as the standard value in Japan. In recent years, surface velocity measurement by STIV is widely used, but only surface flow information...
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| Veröffentlicht in: | Doboku Gakkai Ronbunshu. B1, Suikogaku = Journal of Japan Society of Civil Engineers. Ser. B1, Hydraulic Engineering Ser. B1 (Hydraulic Engineering), 2021, Vol.77(2), pp.I_877-I_882 |
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| container_title | Doboku Gakkai Ronbunshu. B1, Suikogaku = Journal of Japan Society of Civil Engineers. Ser. B1, Hydraulic Engineering |
| container_volume | 77 |
| creator | HAMADA, Takuya YOSHIMURA, Hideto FUJITA, Ichiro NAKAYAMA, Keisuke |
| description | The surface velocity coefficient is the value that converts the surface velocity into the depth-averaged velocity when observing the discharge, and 0.85 is treated as the standard value in Japan. In recent years, surface velocity measurement by STIV is widely used, but only surface flow information can be obtained. Therefore, it is important to properly determine the coefficient when estimating the discharge. In this paper, we focused on the situation where the water depth gradually changes due to the formation of sandbars. We conducted flume experiments to examine the response characteristics of the surface velocity and the surface velocity coefficient caused by changes in the riverbed slope. As a result, it was shown that the change of the correction coefficient is not symmetrical with respect to the riverbed topography, and that the coefficient decreases sharply on the downstream side of the sandbar because the influence of negative acceleration is large. The above characteristics are verified through numerical simulations as well. |
| doi_str_mv | 10.2208/jscejhe.77.2_I_877 |
| format | Article |
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In recent years, surface velocity measurement by STIV is widely used, but only surface flow information can be obtained. Therefore, it is important to properly determine the coefficient when estimating the discharge. In this paper, we focused on the situation where the water depth gradually changes due to the formation of sandbars. We conducted flume experiments to examine the response characteristics of the surface velocity and the surface velocity coefficient caused by changes in the riverbed slope. As a result, it was shown that the change of the correction coefficient is not symmetrical with respect to the riverbed topography, and that the coefficient decreases sharply on the downstream side of the sandbar because the influence of negative acceleration is large. The above characteristics are verified through numerical simulations as well.</description><identifier>EISSN: 2185-467X</identifier><identifier>DOI: 10.2208/jscejhe.77.2_I_877</identifier><language>jpn</language><publisher>Tokyo: Japan Society of Civil Engineers</publisher><subject>Acceleration ; Bathymetry ; Coefficient of variation ; Discharge ; discharge measurement ; Flumes ; Mathematical analysis ; Noise control ; open channel flow ; River beds ; Riverbeds ; Sand bars ; STIV ; Surface flow ; Surface velocity ; surface velocity coefficient ; Velocity ; Velocity coefficient ; Velocity measurement ; Water depth</subject><ispartof>Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 2021, Vol.77(2), pp.I_877-I_882</ispartof><rights>2021 Japan Society of Civil Engineers</rights><rights>Copyright Japan Science and Technology Agency 2021</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,4024,27923,27924,27925</link.rule.ids></links><search><creatorcontrib>HAMADA, Takuya</creatorcontrib><creatorcontrib>YOSHIMURA, Hideto</creatorcontrib><creatorcontrib>FUJITA, Ichiro</creatorcontrib><creatorcontrib>NAKAYAMA, Keisuke</creatorcontrib><title>RESPONSE OF SURFACE VELOCITY COEFFICIENT TO LONGITUDINAL BATHYMETRY VARIATION</title><title>Doboku Gakkai Ronbunshu. B1, Suikogaku = Journal of Japan Society of Civil Engineers. Ser. B1, Hydraulic Engineering</title><addtitle>J. JSCE, Ser. B1</addtitle><description>The surface velocity coefficient is the value that converts the surface velocity into the depth-averaged velocity when observing the discharge, and 0.85 is treated as the standard value in Japan. In recent years, surface velocity measurement by STIV is widely used, but only surface flow information can be obtained. Therefore, it is important to properly determine the coefficient when estimating the discharge. In this paper, we focused on the situation where the water depth gradually changes due to the formation of sandbars. We conducted flume experiments to examine the response characteristics of the surface velocity and the surface velocity coefficient caused by changes in the riverbed slope. As a result, it was shown that the change of the correction coefficient is not symmetrical with respect to the riverbed topography, and that the coefficient decreases sharply on the downstream side of the sandbar because the influence of negative acceleration is large. The above characteristics are verified through numerical simulations as well.</description><subject>Acceleration</subject><subject>Bathymetry</subject><subject>Coefficient of variation</subject><subject>Discharge</subject><subject>discharge measurement</subject><subject>Flumes</subject><subject>Mathematical analysis</subject><subject>Noise control</subject><subject>open channel flow</subject><subject>River beds</subject><subject>Riverbeds</subject><subject>Sand bars</subject><subject>STIV</subject><subject>Surface flow</subject><subject>Surface velocity</subject><subject>surface velocity coefficient</subject><subject>Velocity</subject><subject>Velocity coefficient</subject><subject>Velocity measurement</subject><subject>Water depth</subject><issn>2185-467X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNo9UF1rwjAADIPBxPkH9hTYc10-2iR77LJUA7UZNcp8CmmN0-LUtfqwfz83ZS93cHfcwQHwgNGQECSemq4OzToMOR8Sp53g_Ab0CBZJFDP-fgcGXbepEGKJIJTiHpiUavpmiqmCJoPTWZmlUsG5yo3UdgGlUVmmpVaFhdbA3BQjbWevukhz-JLa8WKibLmA87TUqdWmuAe3K7_twuDKfWAzZeU4ys1IyzSPGiFQVHvkg-BLFjwT9JmjhCZEYIqX_iygwCqWLPmKYrRKAke-EpQxjuuq4gTVCad98HipPbT7r1Pojq7Zn9rdedERRmMhKInROSUvqaY7-o_gDu3m07ffzrfHTb0N7nqV49yRX_h769-t1751YUd_AHScYeE</recordid><startdate>2021</startdate><enddate>2021</enddate><creator>HAMADA, Takuya</creator><creator>YOSHIMURA, Hideto</creator><creator>FUJITA, Ichiro</creator><creator>NAKAYAMA, Keisuke</creator><general>Japan Society of Civil Engineers</general><general>Japan Science and Technology Agency</general><scope>7QH</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H96</scope><scope>KR7</scope><scope>L.G</scope></search><sort><creationdate>2021</creationdate><title>RESPONSE OF SURFACE VELOCITY COEFFICIENT TO LONGITUDINAL BATHYMETRY VARIATION</title><author>HAMADA, Takuya ; YOSHIMURA, Hideto ; FUJITA, Ichiro ; NAKAYAMA, Keisuke</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-j880-ca0ae87d6ea68397053528131daa680e6b65d7f310f5e70ab836671cbb720c573</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>jpn</language><creationdate>2021</creationdate><topic>Acceleration</topic><topic>Bathymetry</topic><topic>Coefficient of variation</topic><topic>Discharge</topic><topic>discharge measurement</topic><topic>Flumes</topic><topic>Mathematical analysis</topic><topic>Noise control</topic><topic>open channel flow</topic><topic>River beds</topic><topic>Riverbeds</topic><topic>Sand bars</topic><topic>STIV</topic><topic>Surface flow</topic><topic>Surface velocity</topic><topic>surface velocity coefficient</topic><topic>Velocity</topic><topic>Velocity coefficient</topic><topic>Velocity measurement</topic><topic>Water depth</topic><toplevel>online_resources</toplevel><creatorcontrib>HAMADA, Takuya</creatorcontrib><creatorcontrib>YOSHIMURA, Hideto</creatorcontrib><creatorcontrib>FUJITA, Ichiro</creatorcontrib><creatorcontrib>NAKAYAMA, Keisuke</creatorcontrib><collection>Aqualine</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Doboku Gakkai Ronbunshu. B1, Suikogaku = Journal of Japan Society of Civil Engineers. Ser. B1, Hydraulic Engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>HAMADA, Takuya</au><au>YOSHIMURA, Hideto</au><au>FUJITA, Ichiro</au><au>NAKAYAMA, Keisuke</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>RESPONSE OF SURFACE VELOCITY COEFFICIENT TO LONGITUDINAL BATHYMETRY VARIATION</atitle><jtitle>Doboku Gakkai Ronbunshu. B1, Suikogaku = Journal of Japan Society of Civil Engineers. Ser. B1, Hydraulic Engineering</jtitle><addtitle>J. JSCE, Ser. B1</addtitle><date>2021</date><risdate>2021</risdate><volume>77</volume><issue>2</issue><spage>I_877</spage><epage>I_882</epage><pages>I_877-I_882</pages><eissn>2185-467X</eissn><abstract>The surface velocity coefficient is the value that converts the surface velocity into the depth-averaged velocity when observing the discharge, and 0.85 is treated as the standard value in Japan. In recent years, surface velocity measurement by STIV is widely used, but only surface flow information can be obtained. Therefore, it is important to properly determine the coefficient when estimating the discharge. In this paper, we focused on the situation where the water depth gradually changes due to the formation of sandbars. We conducted flume experiments to examine the response characteristics of the surface velocity and the surface velocity coefficient caused by changes in the riverbed slope. As a result, it was shown that the change of the correction coefficient is not symmetrical with respect to the riverbed topography, and that the coefficient decreases sharply on the downstream side of the sandbar because the influence of negative acceleration is large. The above characteristics are verified through numerical simulations as well.</abstract><cop>Tokyo</cop><pub>Japan Society of Civil Engineers</pub><doi>10.2208/jscejhe.77.2_I_877</doi></addata></record> |
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| ispartof | Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 2021, Vol.77(2), pp.I_877-I_882 |
| issn | 2185-467X |
| language | jpn |
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| source | Alma/SFX Local Collection |
| subjects | Acceleration Bathymetry Coefficient of variation Discharge discharge measurement Flumes Mathematical analysis Noise control open channel flow River beds Riverbeds Sand bars STIV Surface flow Surface velocity surface velocity coefficient Velocity Velocity coefficient Velocity measurement Water depth |
| title | RESPONSE OF SURFACE VELOCITY COEFFICIENT TO LONGITUDINAL BATHYMETRY VARIATION |
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