MRGO Rock Dam Survey at Bayou la Loutre
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1 MRGO Rock Dam Survey at Survey conducted May 6, 2009 Report released May 18, 2009 By John Lopez, Ph.D. Coastal Sustainability Program Lake Pontchartrain Basin Foundation Final Print Legal size 1 of 13
2 Pictures of colorized graphics posted in the office of the work barge on site at the MRGO rock dam USACE MRGO Rock Dam drawings Plan view Cross dam profile Axial dam profile 2 of 13
3 Southwestern bank of MRGO rock dam May 6, 2009 Channel center of MRGO rock dam May 6, Strong incoming tide with numerous birds and dolphin feeding in dam area. Northeastern bank of MRGO rock dam May 6, of 13
4 Mosaic A Sidescan Sonar Image Mosaic A of the MRGO rock dam closure at Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Al assisting Also i ti Darren D Siddons and Dave Derbes (USACE representatives) Image mosaic of files 219, 220, 221, 22, 223. Image t k iis iin MRGO channel track h l slightly west of center traveling southeast. Scale is approximate. ~~100 feet Sout east MRGO C B A Rock RockDam dam 4 of 13
5 Mosaic A Normal MRGO channel bottom with dredge scars Approximately 41 to 42 feet deep Drag anchor scar Base Stone Placed rock for dam Base Stone for Armor rock Rock furrows due to rock placement in line with channel Sidescan Sonar Image Mosaic A of the MRGO rock dam closure at Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Al assisting Also i ti Darren D Siddons and Dave Derbes (USACE representatives) Image mosaic of files 219, 220, 221, 22, 223. Image t k iis iin MRGO channel track h l slightly west of center traveling southeast. Scale is approximate. ~~100 feet Sout east MRGO C B A Rock RockDam dam Recent deposition Approximately 42 to 44 feet deep 5 of 13
6 Mosaic B Sidescan Sonar Image Mosaic B of the MRGO rock dam closure at Bayou la Loutre Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) Image mosaic of files 224, 225, 226. Image track is in MRGO channel center traveling southeast. M R G O C B Rock Dam A Scale is approximate. ~~100 feet 6 of 13
7 Normal MRGO channel bottom with dredge scars Drag anchor scar Mosaic B Base Stone Base Stone for Armor rock Base Stone Sidescan Sonar Image Mosaic B of the MRGO rock dam closure at Bayou la Loutre Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) Image mosaic of files 224, 225, 226. Image track is in MRGO channel center traveling southeast. M R G O C B Rock Dam A Recent deposition Scale is approximate. ~~100 feet 7 of 13
8 Mosaic C Sidescan Sonar Image Mosaic C of the MRGO rock dam closure at Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) Image mosaic of files 215, 216, 217, 218. Image track is in MRGO channel slightly east of center traveling southeast. M R G O C B A Rock Dam Scale is approximate. ~~100 feet 8 of 13
9 Drag anchor scar Mosaic C Base Stone Base Stone for Armor rock Base Stone Sidescan Sonar Image Mosaic C of the MRGO rock dam closure at Sidescan Sonar imagery acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) Image mosaic of files 215, 216, 217, 218. Image track is in MRGO channel slightly east of center traveling southeast. M R G O C B A Rock Dam Normal MRGO channel bottom with dredge scars Scale is approximate. ~~100 feet 9 of 13
10 Sonar Profile Partially completed rock dam Vertical exaggeration ~~ 10X Add 1.5 feet for depth of transducer Approximately 1:1 Depth hsonar Profile of the MRGO rock dam closure at DepthSonar profile acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) File 232. Image track is in MRGO channel center traveling south to north. 10 of 13
11 t Sonar Profile Partially completed rock dam Base layer Base channel Bedding layer Subsidence is unknown Vertical exaggeration ~~ 10X Add 1.5 feet for depth of transducer Approximately 1:1 Depth Sonar Profile of the MRGO rock dam closure at Depth Sonar profile acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) File 232. Image track is in MRGO channel center traveling south to north. 11 of 13
12 Sonar Profile Sidescan Sonar Image Vertical exaggeration ~~ 10X Add feet for depth of transducer Depth Sonar & Sidescan sonar image Profile of the MRGO rock dam closure at Depth Sonar profile acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator and captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) File 236. Image track is in MRGO channel center. 12 of 13
13 Sonar Profile Sidescan Sonar Image Normal MRGO channel bottom with dredge scars Rock Dam Base and Bedding Rock Dam Base and Bedding Barge Vertical exaggeration ~~ 10X Add feet for depth of transducer Depth Sonar & Sidescan sonar image Profile of the MRGO rock dam closure at Depth Sonar profile acquired May 6, 2009 by the Lake Pontchartrain Basin Foundation. John Lopez, Ph.D. operator andcaptain captain. Also assisting Darren Siddons and Dave Derbes (USACE representatives) File 236. Image track is in MRGO channel center. 13 of 13
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