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LEO CNR4 Center Bay reinstalled
LEO-C_10_-2_0_CNR4 was repurposed back in 8/6/2019 10:30am onwards to the West bay for a remote sensing experiment.
See previous note here, LEO CNR4 Center Bay West Sensor Re-purposed
It has been reinstalled back to the original LEO center slope.
*From 8/6/2019 10:30 am to 3/3/2021 10:15 am, LEO-C_10_-2_0_CNR4 does not have any data as it was physically removed.
LEO East SDI12 5TM and MPS2 power supply failure
Due to a 5V power supply failure in the P02 enclosure and the failure was not caught early, LEO East SDI12 5TM and MPS2 are not available.
The power supply failed 10/8/2020 3:00 am to 11/5/2020 10:30am.
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:
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:
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.
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.
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.
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.
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
LEO Center seepage leak test
Due to a higher than normal seepage flowrate to the LEO center seepage leak position flowmeters (Novalynx and PE102), we investigated the cause of this increase.
From inspection, we had found that seepage drain positions -2 and -1 were clogged due to the coarse soil material. Flowrates returned to normal once they were unclogged.
*The seepage -2 and -1 were previously unclogged.see Center Seepage clog
With this new knowledge, we performed the following tests on 2/6/2020 to see how the clogging the different seepage sections would affect the center seepage leak.
- with -2 plugged from 9:50am to 10:33am
- with -1 plugged from 1:35pm to 2:20pm
We can clearly see that if either seepage divider sections are the flowrate of the seepage leak flowmeter increases. This seems to indicate that there is a larger or additional leak at a higher point of the polypropylene divider plates.
Center Seepage Clog
Unclogged the following locations on LEO Center
1/28/2019 -> -2
1/31/2019 -> -1
*Data shows -1 seepage flowrate was not affected by the clog whereas -2 seepage flowrate was affected.
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.
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