{"id":2273,"date":"2022-06-01T15:40:26","date_gmt":"2022-06-01T15:40:26","guid":{"rendered":"https:\/\/sites.unica.it\/unicawater\/?page_id=2273"},"modified":"2022-06-20T16:06:37","modified_gmt":"2022-06-20T16:06:37","slug":"playing-with-open-channel-currents","status":"publish","type":"page","link":"https:\/\/sites.unica.it\/unicawater\/hydralab\/videos\/playing-with-open-channel-currents\/","title":{"rendered":"Playing with open channel currents"},"content":{"rendered":"<p><strong>Flow through channel contraction<\/strong><br \/>\nChanges in flow regime as the flume passes through a reach contraction on an steep open channel. Upstream (supercritical) current slows down (and becomes subcritical) in order to adjust its specific energy and pass through critical depth. Hydraulic jump witness this transition.<br \/>\nRapid velocity variations in the vertical are combined with significant horizontal variation.<\/p>\n<p><iframe loading=\"lazy\" title=\"Flow through channel contraction\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/n21Lbx5RXMI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><strong>Flow over broad-crested weir<\/strong><br \/>\nA broad-crested weir is used to measure the discharge on open channels as weir height is great enough as to cause critical flow over the weir crest. Upstream and downstream corners are rounded to avoid flow separation.<\/p>\n<p><iframe loading=\"lazy\" title=\"Flow over broad-crested weir\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/OIr8iBNmQFY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><strong>V-Notch Weir<\/strong><br \/>\nV-notch weir. This hydraulic tool is particularly effective at measuring low flow rates in open channel and laboratory equipment.<br \/>\nIt&#8217;s a sharp-crested type such that the water springs clear of the crest.<\/p>\n<p><iframe loading=\"lazy\" title=\"V-Notch Weir\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/yXfAHLEoW8I?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>","protected":false},"excerpt":{"rendered":"<p>Flow through channel contraction Changes in flow regime as the flume passes through a reach contraction on an steep open channel. Upstream (supercritical) current slows down (and becomes subcritical) in <a class=\"more-link\" href=\"https:\/\/sites.unica.it\/unicawater\/hydralab\/videos\/playing-with-open-channel-currents\/\">Continue Reading &amp;rarr;<\/a><\/p>\n","protected":false},"author":2410,"featured_media":0,"parent":2278,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2273","page","type-page","status-publish","hentry"],"publishpress_future_action":{"enabled":false,"date":"2026-04-15 08:06:39","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"frm_application","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/pages\/2273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/users\/2410"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/comments?post=2273"}],"version-history":[{"count":5,"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/pages\/2273\/revisions"}],"predecessor-version":[{"id":2287,"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/pages\/2273\/revisions\/2287"}],"up":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/pages\/2278"}],"wp:attachment":[{"href":"https:\/\/sites.unica.it\/unicawater\/wp-json\/wp\/v2\/media?parent=2273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}