Changes between Version 83 and Version 84 of WikiStart


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Timestamp:
Jan 30, 2020, 11:31:16 AM (7 months ago)
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steiger5na
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  • WikiStart

    v83 v84  
    2020The two Barriers - the shelf break and the ice shelf front - will be studied in two separate sets of Experiments.
    2121
    22 Part I: Divergent isobaths at the shelf break
    23 
    24 An idealized topography representing a widening continental shelf and a trough crosscutting the Continental shelf break is used and the effect of changing 1) water depth 2) radius of curvature and 3) flow speed will be explored. The experiments will be repeated with a) a barotropic and b) a baroclinic current.
    25 
    26 Part II: Flow across an ice shelf front
     22'''Part I: Shelf break experiments'''
     23
     24An idealized topography representing a widening continental shelf and a trough crosscutting the Continental shelf break is used and the effect of changing 1) water depth, 2) radius of curvature, 3) rotation rate and 4) flow speed will be explored. The experiments will be repeated with a) a barotropic and b) a baroclinic (inflow water fresher than ambient water) current.
     25
     26'''Part II: Ice shelf experiments '''
     27
     28An idealized topography of a v-shaped channel sloping downwards towards an ice shelf front is used. The effect of changing 1) ice shelf draft, 2) ice shelf tilt, 3) rotation rate, and 4) flow speed will be explored. The experiments will be repeated with a) a barotropic and b) a baroclinic (inflow water denser than ambient water) current.
    2729
    2830== 2.2 Topography ==
     
    3032''[[Image(Bathymetry_with_Positions.png, 900px)]]''
    3133
    32 ''Sketch of the topography seen from above with the distances to the (0, 0) coordinate. The blue circle and the blue line are the tank wall and the centerline, respectively.''
     34''Sketch of the topography of the continental shelf, as well as the skimmer (at - 374,21) to keep the water level constant and a wall (upper left) to prevent the circulating water from disturbing the inflow. View from above with the distances to the (0, 0) coordinate, which is the center of the tank. The blue circle and the blue line are the tank wall and the centerline, respectively.''
    3335
    3436''[[Image(Bathymetry_Vertical.4.png, 900px)]]''
    3537
    36 ''Sketch of the topography seen from the side with the heights of the different areas.''
     38''Sketch of the shelf topography seen from the side with the heights of the different areas.''
    3739
    3840From experiment 18 the source was moved 2.00m further back! The position of the source relative to the topography stayed as before.
     
    4143''[[Image(Channel_with_Coordinates.png, 900px)]]''
    4244
    43 ''Sketch of the topography seen from above with the distances to the (0, 0) coordinate.''
     45''Sketch of the topography of the v-shaped channel seen from above with the distances to the (0, 0) coordinate, which is the center of the tank. The transparent Plexi-glass ice shelf is marked in blue.''
    4446
    4547[[BR]][[Image(Channel_Sideview_with_Coordinates.png, 900px)]]''''''''''
    4648
    47 Sketch of the topography seen from the side and from the end into the channel.''''''''''
     49''Sketch of the topography of the v-shaped channel and the ice shelf seen from the side including the source in blue and the location of the vertical laser in green, the adjustable ice shelf is marked in blue at the right end of the channel. The lower drawing shows the channel and ice shelf seen from the end into the channel towards the source.''
    4850
    4951== 2.3 Reference axis ==
     
    5456By definition we will use Ox and Oy axis to define the along channel and cross channel axis. The central reference point (0,0) is chosen to be at the front of the ice shelf and in the middle of the channel. Positive u - direction corresponds to the flow direction towards the ice shelf and positive v - direction is directed to the "west".
    5557
    56 == 2.4 References axis along the wall (horizontal and vertical) - Nadine add image! ==
     58== 2.4 References axis along the wall (horizontal and vertical) ==
    5759By definition we will use Ox and Oy axis to define the along shore and the cross shore axis. The central reference point (0,0) along the wall is chosen to be the closest point to the center of the tank (also labeled '''M0?'''). Positive direction corresponds to the mean wave or the mean flow direction.
    5860
     
    6870||''H_laser_down (cm)''||''''''''''||'||''''''''''||||||
    6971
    70 == 2.5 Fixed Parameters ==
     72== 2.5 Parameters for Shelf Break Experiments ==
     73
     74== 2.5.1 Fixed Parameters ==
    7175||'''Notation'''||'''Definition'''||'''Values'''||'''Remarks'''||
    7276||$T_{rotation}$||Rotation period||$50 \ s^-^1$||||
     
    7983||$W_{Source}$||Width of source (inner)||$ 23\ cm$||||
    8084
    81 == 2.5 Variable Parameters ==
     85== 2.5.2 Variable Parameters ==
    8286||'''Notation'''||'''Definition'''||'''Unit'''||'''Initial Estimated Values'''||'''Remarks'''||
    8387||$H_{water}$||Total water depth||$cm$||60 - 70||At the point where waterlevel is not influenced by rotation: r=?? m.||
     
    8791||$\Delta \rho$||Density difference (ambient - inflow)||$kg$||0 - 3 - 10||||
    8892
    89 == 2.6 Additional Parameters ==
    90 ||'''Notation'''||'''Definition'''||'''Unit'''||'''Initial Estimated Values'''||
    91 ||$g'$||Reduced gravity||$m s{-2}$||||
    92 ||$Rd$||Baroclinic deformation radius||$cm$||||
    93 
    94 == 2.7 Definition of the relevant non-dimensional numbers (UPDATE WITH OUR NOTATION!!) ==
     93== 2.6 Parameters for Shelf Break Experiments ==
     94== 2.6.1 Fixed Parameters ==
     95
     96== 2.6.2 Variable Parameters ==
     97
     98
     99
     100== 2.7 Definition of the relevant non-dimensional numbers ==
    95101Rossby number, $ Ro = U/W/f$.
    96102
     
    105111'''Conductivity Sondes (CS)'''
    106112
    107 '''Particle Imaging Velocimetry (PIV)''' A Spectra-Physics Millennia ProS 6W YAG continuous laser (532 nm) in conjunction with 2 cameras was used to provide PIV images. The laser light sheet was brought in parallel to the bottom of the tank in case of the slope front experiments and tilted by 2% to match the slope of the channel in case of the ice front experiments. The light sheet can then be racked in the vertical through a series of steps through the use of a motorized traverse and a mirror set at 45 degrees. The laser has another set of optics to point the light sheet down at the mirror, producing the light sheet. The laser light sheet positions are then synchronized with the PIV cameras. The laser light sheets cover the whole topography, but are slighlty bended towards the sides, so that they are closer to the bottom at the source and at the end of the topography compared to the middle. Also a vertical laser was used together with a vertical camera to observe the flow in a cross section. The three PIV cameras consist of: - one Falcon1 camera ''(Falcon 4M, CMOS 2432*1728 pixels, 10 bits)'' as the vertical camera – with a 35 mm objective lens.[[BR]]
     113'''Particle Imaging Velocimetry (PIV)''' A Spectra-Physics Millennia ProS 6W YAG continuous laser (532 nm) in conjunction with 2 cameras was used to provide PIV images. The laser light sheet was brought in parallel to the bottom of the tank in case of the slope front experiments and tilted by 2% to match the slope of the channel in case of the ice front experiments. The light sheet can then be racked in the vertical through a series of steps through the use of a motorized traverse and a mirror set at 45 degrees. The laser has another set of optics to point the light sheet down at the mirror, producing the light sheet. The laser light sheet positions are then synchronized with the PIV cameras. The laser light sheets cover the whole topography, but are slighlty bended towards the sides, so that they are closer to the bottom at the source and at the end of the topography compared to the middle. Also a vertical laser was used together with a vertical camera to observe the flow in a cross section. The three PIV cameras consist of:
     114
     115- one Falcon1 camera ''(Falcon 4M, CMOS 2432*1728 pixels, 10 bits)'' as the vertical camera – with a 35 mm objective lens.[[BR]]
    108116
    109117- PCO1 (PCO.edge5.5 CMOS cameras (2560*2160 pixels)) with a 35 mm objective lens overlooking the part in front of the source in the slope front experiments and the ice shelf in the ice front experiments.[[BR]]
     
    115123During horizontal PIV, the vertical camera was turned on (with the same acquisition as the PCO1 and PCO2) to produce an .xml file that contains information on the time, dt, exposure time, times for the scanning. During some experiments, this .xml file was missing (technical mistake or if we stopped the acquisition before it was done), so that .xml files from other experiments have to be used and modified to fit the setup. However, the starting time is not correct then.
    116124
    117 == 3.2 Definition of time origin and instrument synchronisation ==
    118 == 3.3 Requested final output and statistics ==
    119 ''Batch processed camera data in to .png files for those experiments from 18-43 that have PIV data, so that images are in a non-proprietary format. PIV analysis of the flow field through multiple horizontal slices in different Z-positions, for the non-rotating case, and for the rotating cases (experiments 18-43 as above), dependent on the quality of the captured PIV images. Average velocity vectors for the channel slices. Potentially information on vorticity would enable the smaller-scale vortical structures that are obvious in some of the videos, to be identified.''
    120125
    121126= 4 - Methods of calibration and data Processing =
     
    125130
    126131== 4.1 Calibration for shelf break experiments ==
    127 The images for PIV (PC01, PC02) are calibrated from images of a horizontal grid, in 3D with an inclined grid (tilted angles) and in the vertical (NAME OF CAMERA!) for the camera fixed on the tank wall.[[BR]]The calibrated images with the grids are stored in 0_REF_FILES/CALIB1 with the [[BR]]- 2D calibration in the directory CALIB_07_09[[BR]]- 3D calibration in the directory CALIB_07_09_3D[[BR]]- Vertical calibration in the directory CALIB_VERTICAL_08-09
     132The images for PIV (PC01, PC02) are calibrated from images of a horizontal grid, in 3D with an inclined grid (tilted angles) and in the vertical for the camera fixed on the tank wall.[[BR]]The calibrated images with the grids are stored in 0_REF_FILES/CALIB1 with the [[BR]]- 2D calibration in the directory CALIB_07_09[[BR]]- 3D calibration in the directory CALIB_07_09_3D[[BR]]- Vertical calibration in the directory CALIB_VERTICAL_08-09
    128133
    129134The images are divided into the two different cameras as PCO1/ and PCO2/.
     
    245250''The laser for the vertical slices is turned on and off outside the wall, where the laser is located. Press the button in the lower right corner of the instrument in the photo.''
    246251
    247 == 5.2 How to connect to the cluster ==
    248 On linux : ssh -CX servcalcul7a
    249 
    250 Then install uvmat (see the legi software page)
    251 
    252 oarsub -I -l walltime=10:0:0 (to change your access time to 10h instead of 2)
    253 
    254 Now you can open matlab
    255 
    256 In uvmat>Run>field series>run mode change to "cluster oar"
    257 
    258 == 5.3 How to connect to the server from home ==
    259 On Linux:
    260 
    261 - Create a tunnel on command line: [[BR]]ssh -L !2222:servcalcul7a:22  username@legilnx02.legi.grenoble-inp.fr [[BR]]- Install X2GoClient (Remote desktop client) and start it[[BR]]- In upper left corner, you can create a new session. The setup for the server is: Host: localhost; Login: username; SSH port: 2222[[BR]]- Once the session is created, you can click on it, enter you password and then you are working on one of the LEGI computers.[[BR]]- To copy files from the server on the private computer, you can use security copy paste in the terminal: [[BR]]scp username@!legilnx02.legi.grenoble-inp.fr:/fsnet/project/coriolis/2017/17ICESHELF/bla.txt   outputdirectory
    262 
    263 On Windows: As Elin!
    264 
    265 == 5.4 How to process the data ==
     252
     253== 5.2 How to process the data ==
    266254All experiments are saved in fsnet>project>coriolis>2017>17ICESHELF>DATAZ>EXPXX. DATAZ corresponds to DATA for the slope front experiments and to DATA2 for the ice shelf experiments. The file EXPXX is for the horizontal laser sheet, EXPXX_SCAN is for the  horizontal scanning and EXPXX_VERT for the vertical sheet.  Within each EXPXX and EXPXX_SCAN you will get three files : FALCON, PC01 and PC02.  These are the three cameras we are using during the experiments, the  FALCON is the camera for the vertical sheet and will only be used to get  the time parameters. The data from the PC01 and PC02 need to be treated  in order to perform the ''PIV''.
    267255
     
    309297
    310298=  =
    311 = 7 - Diary: =
     299= 7 - Diary for Shelf Break Experiments: =
    312300== 7.1 Thursday 07 September ==
    313301The cameras still have to be adjusted. After that is done, we take photos with the calibration grid in the horizontal and in 3D with both cameras that are fixed on the roof. With PIV, we conduct the calibration of both cameras as described in 4.1.
     
    685673
    686674= 8 - Table of Experiments: =
    687 
    688675 * will be updated from Excel sheet!
    689676
     
    696683||4||exp04||13092017||||50||||0.50||0||6.8||||HS,Scan||||||200ms||no||Laser started vibrating for the scans||Elin||
    697684
    698 
    699 
    700685= 9 - Parameter table with Ice Shelf Experiments =
    701 
    702 ||EXP   ||Date  ||T (s) ||dH (cm)       ||Q (l/min)     ||dRho (kg/m³)||
    703 ||1     ||09/10/17 16:57        ||60    ||0     ||50    ||0||
    704 ||2     ||10/10/17 10:20        ||60    ||0     ||30    ||0||
    705 ||3     ||10/10/17 14:03        ||60    ||5     ||30    ||0||
    706 ||4     ||10/10/17 14:59        ||60    ||10    ||30    ||0||
    707 ||5     ||10/10/17 15:49        ||60    ||15    ||30    ||0||
    708 ||6     ||10/10/17 16:36        ||60    ||15    ||50    ||0||
    709 ||7     ||11/10/17 10:11        ||60    ||20    ||30    ||0||
    710 ||8     ||11/10/17 10:11        ||60    ||20    ||30    ||0||
    711 ||9     ||11/10/17 13:47        ||60    ||0     ||30    ||0||
    712 ||10    ||11/10/17 15:35        ||60    ||0     ||30    ||0||
    713 ||11    ||11/10/17 16:38        ||60    ||0     ||15    ||0||
    714 ||12    ||12/10/17 08:35        ||60    ||15    ||30    ||0||
    715 ||13    ||12/10/17 10:23        ||60    ||30    ||30    ||0,4||
    716 ||14    ||13/10/17 08:15        ||30    ||30    ||30    ||0||
    717 ||15    ||16/10/17 09:22        ||30    ||0     ||30    ||0||
    718 ||16    ||16/10/17 11:16        ||30    ||0     ||30    ||0||
    719 ||17    ||16/10/17 14:25        ||30    ||0     ||50    ||0||
    720 ||18    ||16/10/17 15:39        ||30    ||15    ||50    ||0||
    721 ||19    ||16/10/17 16:29        ||30    ||15    ||30    ||0||
    722 ||20    ||17/10/17 08:35        ||30    ||30    ||50    ||0||
    723 ||21    ||17/10/17 08:40        ||30    ||30 - 0 (tilted)       ||50    ||0||
    724 ||22    ||17/10/17 11:12        ||30    ||30 - 0 (tilted)       ||30    ||0||
    725 ||23    ||17/10/17 14:30        ||30    ||30 - 15 (tilted)      ||30    ||0||
    726 ||24    ||17/10/17 15:51        ||30    ||30 - 15 (tilted)      ||50    ||0||
    727 ||25    ||19/10/17 09:20        ||30    ||30    ||50    ||0||
    728 || ||BUILT WALL:                ||              || || || ||
    729 ||26    ||19/10/17 13:46        ||30    ||30    ||50    ||0||
    730 ||27    ||19/10/17 14:47        ||30    ||30    ||30    ||0||
    731 ||28    ||19/10/17 16:02        ||30    ||30    ||30    ||1||
    732 ||29    ||20/10/17 09:19        ||30    ||30 - 0 (tilted)       ||30    ||0||
    733 ||30    ||20/10/17 10:39        ||30    ||30 - 0 (tilted)       ||60    ||0||
    734 ||31    ||20/10/17 13:42        ||30    ||30-15 (tilted)        ||60    ||0||
    735 ||32    ||20/10/17 14:44        ||30    ||30 - 15 (tilted)      ||30    ||0||
    736 ||33    ||20/10/17 16:34        ||30    ||0     ||30    ||0||
    737 ||34    ||23/10/17 08:41        ||30    ||0     ||60    ||0||
    738 || ||SOURCE MOVED DOWNSTREAM    ||      || || || || ||         
    739 ||35    ||23/10/17 09:44        ||30    ||0     ||60    ||0||
    740 || ||PROBES PUT IN PLACE        || || || || ||         
    741 ||36    ||23/10/17 16:07        ||30    ||0     ||60    ||1||
    742 ||37    ||23/10/17 16:58        ||30    ||0     ||30    ||1||
    743 ||38    ||24/10/17 08:50        ||30    ||30    ||30    ||1||
    744 ||39    ||24/10/17 09:45        ||30    ||30    ||60    ||1||
    745 ||40    ||24/10/17 10:40        ||30    ||30-15 (tilted)        ||60    ||1||
    746 ||41    ||24/10/17 11:21        ||30    ||30-15 (tilted)        ||30    ||1||
    747 ||42    ||24/10/17 13:45        ||30    ||30-15 (tilted)        ||30    ||2||
    748 ||43    ||24/10/17 14:35        ||30    ||30-15 (tilted)        ||60    ||2||
    749 ||44    ||24/10/17 15:22        ||30    ||30-0 (tilted) ||60    ||2||
    750 ||45    ||24/10/17 16:04        ||30    ||30-0 (tilted) ||30    ||2||
    751 ||46    ||24/10/17 16:42        ||30    ||30-0 (tilted) ||30    ||2||
    752 ||47    ||25/10/17 08:36        ||30    ||30-0 (tilted) ||60    ||1||
    753 ||48    ||25/10/17 09:09        ||30    ||30-0 (tilted) ||30    ||1||
    754 ||49    ||25/10/17 10:20        ||30    ||30    ||30    ||2||
    755 ||50    ||25/10/17 10:58        ||30    ||30    ||60    ||2||
    756 ||51    ||25/10/17 13:59        ||30    ||0     ||60    ||2||
    757 ||52    ||25/10/17 15:19        ||30    ||0     ||30    ||2||
    758 ||53    ||25/10/17 15:58        ||30    ||0     ||30||  2||
    759 ||54    ||25/10/17 16:58        ||30    ||30    ||30    ||2||
    760 ||55    ||26/10/17 09:26        ||30    ||30-15 (tilted)        ||30    ||2||
    761 ||56    ||26/10/17 10:12        ||30    ||30-0 (tilted) ||30    ||2||
    762 ||57    ||26/10/17 14:19        ||30    ||30-0 (tilted) ||60    ||0||
    763 ||58    ||26/10/17 15:24        ||30    ||30-0 (tilted) ||60    ||0||
    764 ||59    ||26/10/17 16:40        ||30    ||30-15 (tilted)        ||60    ||0||
    765 ||60    ||27/10/17 09:16        ||30    ||15    ||60    ||0||
    766 ||61    ||27/10/17 10:56        ||30    ||15    ||30    ||0||
    767 ||62    ||27/10/17 14:34        ||30    ||0     ||30    ||||
    768 ||63    ||27/10/17 around 16    ||30    ||0     ||30    ||||
    769 ||64    ||30/10/17 14:05        ||30    ||0     ||30    ||2||
    770 ||65    ||30/10/17 14:58        ||30    ||0     ||30    ||2||
    771 ||66    ||30/10/17 15:47        ||30    ||0     ||60    ||2||
    772 ||67    ||30/10/17 16:37        ||30    ||30    ||30    ||||
    773 ||68    ||30/10/17 17:10        ||30    ||30    ||15    ||||
    774 ||69    ||31/10/17 09:05        ||30    ||30    ||15    ||2||
    775 ||70    ||31/10/17 09:44        ||30    ||30    ||30    ||2||
    776 ||71    ||31/10/17 10:36        ||30    ||30    ||30    ||2||
     686||EXP||Date||T (s)||dH (cm)||Q (l/min)||dRho (kg/m³)||
     687||1||09/10/17 16:57||60||0||50||0||
     688||2||10/10/17 10:20||60||0||30||0||
     689||3||10/10/17 14:03||60||5||30||0||
     690||4||10/10/17 14:59||60||10||30||0||
     691||5||10/10/17 15:49||60||15||30||0||
     692||6||10/10/17 16:36||60||15||50||0||
     693||7||11/10/17 10:11||60||20||30||0||
     694||8||11/10/17 10:11||60||20||30||0||
     695||9||11/10/17 13:47||60||0||30||0||
     696||10||11/10/17 15:35||60||0||30||0||
     697||11||11/10/17 16:38||60||0||15||0||
     698||12||12/10/17 08:35||60||15||30||0||
     699||13||12/10/17 10:23||60||30||30||0,4||
     700||14||13/10/17 08:15||30||30||30||0||
     701||15||16/10/17 09:22||30||0||30||0||
     702||16||16/10/17 11:16||30||0||30||0||
     703||17||16/10/17 14:25||30||0||50||0||
     704||18||16/10/17 15:39||30||15||50||0||
     705||19||16/10/17 16:29||30||15||30||0||
     706||20||17/10/17 08:35||30||30||50||0||
     707||21||17/10/17 08:40||30||30 - 0 (tilted)||50||0||
     708||22||17/10/17 11:12||30||30 - 0 (tilted)||30||0||
     709||23||17/10/17 14:30||30||30 - 15 (tilted)||30||0||
     710||24||17/10/17 15:51||30||30 - 15 (tilted)||50||0||
     711||25||19/10/17 09:20||30||30||50||0||
     712||||BUILT WALL:||||||||||
     713||26||19/10/17 13:46||30||30||50||0||
     714||27||19/10/17 14:47||30||30||30||0||
     715||28||19/10/17 16:02||30||30||30||1||
     716||29||20/10/17 09:19||30||30 - 0 (tilted)||30||0||
     717||30||20/10/17 10:39||30||30 - 0 (tilted)||60||0||
     718||31||20/10/17 13:42||30||30-15 (tilted)||60||0||
     719||32||20/10/17 14:44||30||30 - 15 (tilted)||30||0||
     720||33||20/10/17 16:34||30||0||30||0||
     721||34||23/10/17 08:41||30||0||60||0||
     722||||SOURCE MOVED DOWNSTREAM||||||||||||
     723||35||23/10/17 09:44||30||0||60||0||
     724||||PROBES PUT IN PLACE||||||||||
     725||36||23/10/17 16:07||30||0||60||1||
     726||37||23/10/17 16:58||30||0||30||1||
     727||38||24/10/17 08:50||30||30||30||1||
     728||39||24/10/17 09:45||30||30||60||1||
     729||40||24/10/17 10:40||30||30-15 (tilted)||60||1||
     730||41||24/10/17 11:21||30||30-15 (tilted)||30||1||
     731||42||24/10/17 13:45||30||30-15 (tilted)||30||2||
     732||43||24/10/17 14:35||30||30-15 (tilted)||60||2||
     733||44||24/10/17 15:22||30||30-0 (tilted)||60||2||
     734||45||24/10/17 16:04||30||30-0 (tilted)||30||2||
     735||46||24/10/17 16:42||30||30-0 (tilted)||30||2||
     736||47||25/10/17 08:36||30||30-0 (tilted)||60||1||
     737||48||25/10/17 09:09||30||30-0 (tilted)||30||1||
     738||49||25/10/17 10:20||30||30||30||2||
     739||50||25/10/17 10:58||30||30||60||2||
     740||51||25/10/17 13:59||30||0||60||2||
     741||52||25/10/17 15:19||30||0||30||2||
     742||53||25/10/17 15:58||30||0||30||2||
     743||54||25/10/17 16:58||30||30||30||2||
     744||55||26/10/17 09:26||30||30-15 (tilted)||30||2||
     745||56||26/10/17 10:12||30||30-0 (tilted)||30||2||
     746||57||26/10/17 14:19||30||30-0 (tilted)||60||0||
     747||58||26/10/17 15:24||30||30-0 (tilted)||60||0||
     748||59||26/10/17 16:40||30||30-15 (tilted)||60||0||
     749||60||27/10/17 09:16||30||15||60||0||
     750||61||27/10/17 10:56||30||15||30||0||
     751||62||27/10/17 14:34||30||0||30||||
     752||63||27/10/17 around 16||30||0||30||||
     753||64||30/10/17 14:05||30||0||30||2||
     754||65||30/10/17 14:58||30||0||30||2||
     755||66||30/10/17 15:47||30||0||60||2||
     756||67||30/10/17 16:37||30||30||30||||
     757||68||30/10/17 17:10||30||30||15||||
     758||69||31/10/17 09:05||30||30||15||2||
     759||70||31/10/17 09:44||30||30||30||2||
     760||71||31/10/17 10:36||30||30||30||2||