Field Notes

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Hill Slough: 2024-11-06 13:05:00 (DOY 311)
Author: Daphne Szutu
Others: Robert

Summary: Super duper windy, low tide, removed EXO because wiper was not working, swapped 7500 for calibration

2024-11-06
Hill Slough

Robert and I arrived at 13:05 PST. It was super duper windy, clear, and sunny; today is the day after the election and a Red Flag Warning day for high winds and low humidities. The water level was low but coming back up by the time we left.

The staff gauge read 4.0ft at 13:42PST (top of the channel staff gauge).

We swapped the 7500 for calibration: sn 0042 came off and sn 75H-2176 went on. I uploaded the new config file, updated the pressure coefficients, reset the box, and checked that all looked ok. The pressure was off, so I checked that the pressure coefficients were correct. They were still the old coefficients from the lab 7550, so I changed it again and the 7500 pressure looked good.

I downloaded met, cam, and USB GHG data. I changed the 7700 heater to winter hours; from 20:00-06:00 to 18:00-08:00. I took porewater conductivity but there wasn’t enough water for surface water measurements.

Porewater, 7.89mS, 18.5C

old 0035 read: 404ppm CO2, 321mmol/m3 H2O, 20.8C, 101.8kPa, 97SS
fresh 75H-2176 read: 424ppm CO2, 170mmol/m3 H2O, 20.8C, 101.8kPa, 99.9SS
7700 read: 2.0ppm CH4, 40RSSI – 88 after cleaning

Robert cleaned flux and rad sensors. The reservoir was 70% full; he refilled it.

I noticed there was only an hour of depth and wiper data from the EXO in the last two weeks, and since then was NAN. The fDOM, turbidity, and conductivity data seemed reasonable.

At the channel, I confirmed the EXO was hanging horizontally, since last time when we installed it, the sonde was underwater so we couldn’t confirm its horizontality. We also need to pay attention to its orientation when its hanging horizontally, because the depth sensor is not centered on the sonde.

I connected to the EXO via the DCP signal adapter in the enclosure and there was an error triangle in the upper right hand corner that said something like “too much power drawn from port 7.” This is the central port where the wiper is attached. A previous wiper leaked, so I’m guessing something similar is happening and drawing too much power. All of the sensors were muddy so I wouldn’t trust fDOM and turbidity in the past 2 weeks. Conductivity could be ok; we can compare with the CTD numbers.

We left at 13:45 PST.

0 photos found

4 sets found

20 HS_met graphs found