Karaburan
Project Karaburan | |
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Monitoring water quality | |
Status | Initializing |
Contact | bertrik |
Last Update | 2024-04-29 |
Introduction
Topics:
- air quality sensors
- ammonia
- NOx
- water chemical analysis
- nitrates
- ammonia
- dissolved oxygen
- sulfide/sulfate
- phosphates?
- salinity (chlorides?)
- water physical analysis
- temperature
- clarity/turbidity -> investigate standard ways of measuring/expressing this
- conductivity/total dissolved solids
- water properties by light reflection, hyperspectral/polarity
- depth?
- boat control
- trajectory -> steering
- idea: interface with the remote control, not with the boat
- idea: find a boat with easily hackable remote control protocol
- idea: can we get sensor data over this link too, e.g. GPS?
- camera control
- post-processing
- data presentation
- video/photo stitching
- time lapse view
- map view of properties
- data presentation
- use cases
- verify with domain experts, how to engage?
- slootview, under/above water
- minimum viable prototype
- high-res measurement by location, by time
- materials
- boat selection
- processing platform selection
- communication platform selection
Air quality sensors
Nitrogen compounds in air
According to https://www.rivm.nl/stikstof/monitoren-advies-onderzoek/overzicht-stikstofmetingen/metingen-stikstof-in-de-lucht average (typical?) values of
- Ammonia (NH3): 6.7 ug/m3 (9.6 ppb)
- NOx: 27.3 ug/m3
- NO2: 18.6 ug/m3 (9.9 ppb)
(ppb-conversion using https://www.breeze-technologies.de/blog/air-pollution-how-to-convert-between-mgm3-%C2%B5gm3-ppm-ppb/ )
RIVM report on inexpensive nitrogen-in-air sensors: https://www.samenmeten.nl/sensoren-voor-no2 Conclusion: most sensors are not sensitive enough to be used in typical outdoor conditions, with perhaps one exception: alphasense NO2-B43F
Water physical analysis
Turbidity / clarity
See https://en.wikipedia.org/wiki/Turbidity
Aliexpress sensor TS-300B: https://nl.aliexpress.com/item/1005006732956937.html Has a range 0 ~ 1000 ± 30 NTU
Drinking water upper limit: 4 NTU (European turbidity standard for drinking water) Ambient water: 10-150 NTU. The US state of Washington use a "background" value of 50 NTU as reference. (see https://en.wikipedia.org/wiki/Turbidity#Standards_and_test_methods )
So the Aliexpress sensor is mostly suited for very dirty water.
Boat control
Typically the wireless link looks like this:
- 2.4 GHz working frequency
- 500m range
Interesting links:
- Flytec-2011 remote control https://nl.aliexpress.com/item/1005002984723718.html
- Replacement board for various boats with "18" in their type number: https://nl.aliexpress.com/item/1005006115484716.html
- DIY Multi-protocol module: https://github.com/pascallanger/DIY-Multiprotocol-TX-Module
Use cases
material:
- https://www.youtube.com/watch?v=cMk0bGvIU1E
- https://iplo.nl/thema/water/oppervlaktewater/kaderrichtlijn-water
- kaartje: https://krw-nutrend.netlify.app/ -> 2 meetpunten op de reeuwijkse plassen, tijdresolutie is 1 jaar?
Useful distinction, typically used in documents/guidelines:
- chemical quality, what substances are present in the water?
- biological / ecology quality, what kind of living organisms live in the water?
Reeuwijkse plassen
See
- https://www.rijnland.net/wat-doet-rijnland/in-uw-buurt/reeuwijkse-plassen/ their stated goal: CLEAR WATER
- https://www.rijnland.net/regels-op-een-rij/subsidies-en-andere-financi%C3%ABle-bijdragen/
potential applications:
- slootview, inspect water sides over time
- underwater camera: detect invasive cray fish
- sample water properties at high spatial resolution, high time resolution
- early detection of indicators for cyanobacteria: temperature and nutrients