Rockbed Wear At A Flow Convergence Zone in Fifteen Mile Creek, Niagara Peninsula, Ontario
Sculpted bedforms developed in rock channels must be considered within the context of temporally and spatially persistent flow dynamics. A shallow meandering channel (14 m long, 30‐50 cm wide, 3‐4 cm deep) with raised margins has been eroded into resistant Irondequoit Limestone, forming the streambe...
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| Veröffentlicht in: | The Journal of geology 1997-03, Vol.105 (2), p.263-274 |
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| container_title | The Journal of geology |
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| creator | Tinkler, Keith J. |
| description | Sculpted bedforms developed in rock channels must be considered within the context of temporally and spatially persistent flow dynamics. A shallow meandering channel (14 m long, 30‐50 cm wide, 3‐4 cm deep) with raised margins has been eroded into resistant Irondequoit Limestone, forming the streambed of Fifteen Mile Creek; Ontario. Potholes ( |
| doi_str_mv | 10.1086/515918 |
| format | Article |
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A shallow meandering channel (14 m long, 30‐50 cm wide, 3‐4 cm deep) with raised margins has been eroded into resistant Irondequoit Limestone, forming the streambed of Fifteen Mile Creek; Ontario. Potholes (<18 cm deep, <25 cm wide, <35 cm long) within the channel increase in size downstream. Subaerial solution of the limestone and fracture patterns within the Irondequoit Limestone are not responsible for this. Large dolostone blocks within the channel stabilize patterns of vorticity that form in the lee of the blocks during highflows when flow is about 1.3 m deep. Vortices migrating downstream along a major flow junction have eroded the distinctive channel. Small irregularities in the bed may enlarge to potholes by attracting vortices and undergoing erosional wear as they pass. The feature may have developed within several hundred to several thousand years, but likely developed in relation to flows with magnitudes approaching the Mean Annual Flood, or larger. No other examples are known in Fifteen Mile Creek, or adjacent systems, and it is likely that the large block in the center channel dropped from an overhang and has not subsequently moved.</description><identifier>ISSN: 0022-1376</identifier><identifier>EISSN: 1537-5269</identifier><identifier>DOI: 10.1086/515918</identifier><identifier>CODEN: JGEOAZ</identifier><language>eng</language><publisher>Chicago: The University of Chicago Press</publisher><subject>Bodies of water ; Boulders ; Creeks ; Floods ; Flow velocity ; Geology ; Limestones ; Rivers ; Rocks ; Soil erosion ; Stone ; Streams ; Vorticity</subject><ispartof>The Journal of geology, 1997-03, Vol.105 (2), p.263-274</ispartof><rights>1997 by The University of Chicago. All rights reserved.</rights><rights>Copyright University of Chicago, acting through its Press Mar 1997</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a293t-a394f727f1fcf3eae24cb74a96842bf0f8b9add501df776bb91a8a66526cbde33</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,799,27903,27904</link.rule.ids></links><search><creatorcontrib>Tinkler, Keith J.</creatorcontrib><title>Rockbed Wear At A Flow Convergence Zone in Fifteen Mile Creek, Niagara Peninsula, Ontario</title><title>The Journal of geology</title><description>Sculpted bedforms developed in rock channels must be considered within the context of temporally and spatially persistent flow dynamics. A shallow meandering channel (14 m long, 30‐50 cm wide, 3‐4 cm deep) with raised margins has been eroded into resistant Irondequoit Limestone, forming the streambed of Fifteen Mile Creek; Ontario. Potholes (<18 cm deep, <25 cm wide, <35 cm long) within the channel increase in size downstream. Subaerial solution of the limestone and fracture patterns within the Irondequoit Limestone are not responsible for this. Large dolostone blocks within the channel stabilize patterns of vorticity that form in the lee of the blocks during highflows when flow is about 1.3 m deep. Vortices migrating downstream along a major flow junction have eroded the distinctive channel. Small irregularities in the bed may enlarge to potholes by attracting vortices and undergoing erosional wear as they pass. The feature may have developed within several hundred to several thousand years, but likely developed in relation to flows with magnitudes approaching the Mean Annual Flood, or larger. No other examples are known in Fifteen Mile Creek, or adjacent systems, and it is likely that the large block in the center channel dropped from an overhang and has not subsequently moved.</description><subject>Bodies of water</subject><subject>Boulders</subject><subject>Creeks</subject><subject>Floods</subject><subject>Flow velocity</subject><subject>Geology</subject><subject>Limestones</subject><subject>Rivers</subject><subject>Rocks</subject><subject>Soil erosion</subject><subject>Stone</subject><subject>Streams</subject><subject>Vorticity</subject><issn>0022-1376</issn><issn>1537-5269</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNo90F9LwzAUBfAgCs6p30AIPvi0av60SfM4ilNBnYgi-lJu25vRrSYz6RS_vZWJT-flx7ncQ8gxZ-ec5eoi45nh-Q4Z8UzqJBPK7JIRY0IkXGq1Tw5iXDLGpcjYiLw--npVYUNfEAKd9nRKZ53_ooV3nxgW6Gqkb94hbR2dtbZHdPSu7ZAWAXE1ofctLCAAfUDXurjpYELnrofQ-kOyZ6GLePSXY_I8u3wqrpPb-dVNMb1NQBjZJyBNarXQltvaSgQUaV3pFIzKU1FZZvPKQNNkjDdWa1VVhkMOSg1_1VWDUo7J6bZ3HfzHBmNfLv0muOFkyU2aylQZNqCzLaqDjzGgLdehfYfwXXJW_q5Wblcb4MkWLmPvw7-SjOWMGy1_ADEpZr8</recordid><startdate>19970301</startdate><enddate>19970301</enddate><creator>Tinkler, Keith J.</creator><general>The University of Chicago Press</general><general>University of Chicago, acting through its Press</general><scope>AAYXX</scope><scope>CITATION</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>19970301</creationdate><title>Rockbed Wear At A Flow Convergence Zone in Fifteen Mile Creek, Niagara Peninsula, Ontario</title><author>Tinkler, Keith J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a293t-a394f727f1fcf3eae24cb74a96842bf0f8b9add501df776bb91a8a66526cbde33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Bodies of water</topic><topic>Boulders</topic><topic>Creeks</topic><topic>Floods</topic><topic>Flow velocity</topic><topic>Geology</topic><topic>Limestones</topic><topic>Rivers</topic><topic>Rocks</topic><topic>Soil erosion</topic><topic>Stone</topic><topic>Streams</topic><topic>Vorticity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tinkler, Keith J.</creatorcontrib><collection>CrossRef</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>The Journal of geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tinkler, Keith J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Rockbed Wear At A Flow Convergence Zone in Fifteen Mile Creek, Niagara Peninsula, Ontario</atitle><jtitle>The Journal of geology</jtitle><date>1997-03-01</date><risdate>1997</risdate><volume>105</volume><issue>2</issue><spage>263</spage><epage>274</epage><pages>263-274</pages><issn>0022-1376</issn><eissn>1537-5269</eissn><coden>JGEOAZ</coden><abstract>Sculpted bedforms developed in rock channels must be considered within the context of temporally and spatially persistent flow dynamics. A shallow meandering channel (14 m long, 30‐50 cm wide, 3‐4 cm deep) with raised margins has been eroded into resistant Irondequoit Limestone, forming the streambed of Fifteen Mile Creek; Ontario. Potholes (<18 cm deep, <25 cm wide, <35 cm long) within the channel increase in size downstream. Subaerial solution of the limestone and fracture patterns within the Irondequoit Limestone are not responsible for this. Large dolostone blocks within the channel stabilize patterns of vorticity that form in the lee of the blocks during highflows when flow is about 1.3 m deep. Vortices migrating downstream along a major flow junction have eroded the distinctive channel. Small irregularities in the bed may enlarge to potholes by attracting vortices and undergoing erosional wear as they pass. The feature may have developed within several hundred to several thousand years, but likely developed in relation to flows with magnitudes approaching the Mean Annual Flood, or larger. No other examples are known in Fifteen Mile Creek, or adjacent systems, and it is likely that the large block in the center channel dropped from an overhang and has not subsequently moved.</abstract><cop>Chicago</cop><pub>The University of Chicago Press</pub><doi>10.1086/515918</doi><tpages>12</tpages></addata></record> |
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| language | eng |
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| source | Jstor Complete Legacy |
| subjects | Bodies of water Boulders Creeks Floods Flow velocity Geology Limestones Rivers Rocks Soil erosion Stone Streams Vorticity |
| title | Rockbed Wear At A Flow Convergence Zone in Fifteen Mile Creek, Niagara Peninsula, Ontario |
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