LEO

Last modified by Michael Sibayan on 2015/02/13 12:32
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Category: LEO (60 posts) [RSS]

Jul 29 2020

Gravity flow experiment

Gravity flow experiment, July 2020

Prior to the experiment the NovaLynx tipping buckets were calibrated (see this post).

The experiment was repeated separately for each hillslope, since the storage tanks cannot hold enough water for a 12h rain with the Multi 1 circuit on all 3 hillslopes simultaneously.

For each hillslope a 1h rain event was performed to calibrate the rainfall distribution followed by a 12h rain event on the following day to reach a gravity flow regime down to a depth of 50cm.

Details on the rainfall calibration: rainfall_calibration.xlsx

Schedule: 

Date Task Comment 
 CENTER 
 2020-07-06 Spanned ropes on Center hillslope to mark cup locations for rainfall calibration. Masts were raised in the morning. Kept raised until after the 12h rain event.
 Ropes spanned upslope-downslope with pre-labeled marks every 2m from 0-30m.
 2020-07-07 Placed cups on Center hillslope and removed ropes. 
 2020-07-08 Issues with Tipping Bucket counts, switched to cumulative counts to reduce impact. See also NovaLynx calibration
 2020-07-09 Rainfall calibration, Multi 1, Center hillslope.
 Collected and weighed cups after 1h of rain (08:30-09:30).
 Details in attached excel file. Air handler off during the rain.
 2020-07-10 12h rain event (8:30-20:30), Multi 1, Center hillslope.  Air handlers were turned off during rain.
Discharge collection for Center -1 (PE102 and NovaLynx) was leaking. Fixed at 19:40.
 Mast lowered after the rain event.
 EAST 
 2020-07-13 Spanned ropes on East hillslope to mark cup locations for rainfall calibration. Masts were raised in the morning. Kept raised until after the 12h rain event.  
 Ropes spanned upslope-downslope with pre-labeled marks every 2m from 0-30m.
 2020-07-14 Placed cups on East hillslope and removed ropes. 
 2020-07-15 Rainfall calibration, Multi 1, East hillslope.
 Collected and weighed cups after 1h of rain (08:30-09:30).
 Details in attached excel file. Air handler off during the rain.
 2020-07-16 12h rain event (8:30-20:30), Multi 1, East hillslope. Air handlers were turned off during rain.
 Mast lowered after the rain event. 
 WEST 
 2020-07-20 Spanned ropes on West hillslope to mark cup locations for rainfall calibration. Masts were raised in the morning. Kept raised until after the 12h rain event.  
 Ropes spanned upslope-downslope with pre-labeled marks every 2m from 0-30m.
 2020-07-21 Placed cups on West hillslope and removed ropes. 
 2020-07-22 Rainfall calibration, Multi 1, West hillslope.
 Collected and weighed cups after 1h of rain (08:30-09:30).
 Details in attached excel file. Air handler off during the rain.
 Gantry malfunction caused an interruption of several hours during the cup collection.
 2020-07-23 12h rain event (8:30-20:30), Multi 1, West hillslope. Air handlers were turned off during rain.
 Mast lowered after the rain event. 

After the experiment, cups, labeled ropes and cardboard transport boxes used for the cup collection during the rainfall calibration were stored in upper habitat office 10.

NovaLynx calibration and switch to cumulative counts

Prior to the gravity flow experiment, the NovaLynx tipping buckets were calibrated in June/July 2020.

For details of the calibration see here: novalynx_calibration_2020.xlsx

During the calibration we noticed that duplicate counts can occur.

To reduce the issue, the counting of the NovaLynx tipping buckets and PE102 flow meters was switched to cumulative counts on 2020-07-08.

Jun 03 2020

LEO Center 14_-3_0 Load cells 3130 channel swap II

LEO Center 14_-3_0 load cells measurement channel was previously switched on 7/3/2019. 

http://b2.arizona.edu:8080/wiki/bin/view/Blog/LEO+Center+Load+cells+3130+channel+swap

We experienced an error on 3/30/2020 around 2pm where the load cell was reading an extremely high mass than usual.

This was tracked down to water ingressing onto the load cell and causing it to read incorrectly.

We switched the channel again on 6/9/2020.

Currently (August 2020), we are applying a bead of caulking around the LEO hillslope frame above the load cells to prevent water reaching it.

Mar 24 2020

Corrected center bay PE102 leak data

PE102 Center bay for the leak was wired incorrectly, hence, it was never recording properly since 2018 till Jan 2020.

Since this PE102 only measured the leak from the seepage, it only exhibited low flow rate and was never above the minimum flowrate of the PE102.

However, due to a recent accidental discovery of the seepage leak in the center bay with the -2 and -1 seepage locations clogged, it had increased the flowrate of the leak to a point that was greater than the Novalynx tipping bucket measurable flowrate and within the measurable flowrate of the PE102.

The Database has been updated with the corrected PE102 center bay leak flowrate.

Feb 12 2020

3130 Load cell temperature

We have started logging the 3130 load cell temperature in order to potentially perform temperature compensation for the thermal drifts.

East - 2/2/2020 ~3:50pm

Center & West - 2/11/2020 ~3:15pm

Feb 06 2020

Jan 31 2020

Center Seepage Clog


...

Jan 22 2020

PE102 and Novalynx maintenance.

West slope.

PE102:

  • -4 - funnel was not directly under the drain. Repositioned.
  • -2, 2 & 4 may need to be flushed/cleaned
  • Reseated the questionable PE102 connectors

Novalynx:

  • -2 - tipping bucket was stuck. Adjusted the screws holding the shaft so it moves freely.   

Center slope:
Novalynx:

  • -1 and leak - replaced bad proxy switches
  • 2 - tipping bucket was caught on a screw that was along the side of the body.   

.

Sep 16 2019

1 sec/min Data logging Performance Issue

There was a performance issue with the main dsc.b2 server with generating log files for 1 minute and 1 second log files.

Affected time range: 9/11/2019 8:10 PM to 9/16/2019 10:40AM

Aug 14 2019

LEO CNR4 Center Bay West Sensor Re-purposed

The west most CNR4 Sensor (LEO-C_10_-2_0_CNR4) was removed from the Center Bay mast on Thursday August 8th between 8am and 10 am by Aaron Bugaj.

This sensor is temporary being used in the West bay for a remote sensing experiment.

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Created by Michael Sibayan on 2015/02/13 12:32

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