Category Archives: Physical environment

The HydroBall – An aquatic GIS adventure.

Madeline Healey (SWEP 2018)

The Queens University Biological Station (QUBS) strives to be one of the best field stations in North America. To enrich the resources available to researchers, QUBS recently sough to apply a new technology to improve the bathymetric maps of our local lakes. A continually evolving technology, the Hydroball® buoy was obtained for data collection at QUBS over a two week period in the summer of 2018 . The Hydroball system integrates three main components: a GNSS L1/L2 receiver, a miniature inertial motion sensor, and a single beam echosounder. The GNSS receiver measures the buoys real time position including latitude, longitude and ‘ellipsoidal height.’ The inertial sensor measures roll, pitch and heading while the echosounder measures the depth under the buoy using SONAR (Sound Navigation and Ranging) properties. The output data of these components is fed into a controller unit inside the buoy that allows up to ten soundings per second to be referenced to the seabed.

Now, you may be asking “What is a Hydroball?” At first glance it looks like something out of a Star Wars movie (BB8’s aquatic cousin?) – the Hydroball concept is actually quite simple. It is a small autonomous bathymetric buoy developed by CIDCO (The Interdisciplinary Centre for Development of Ocean Mapping; Figure 1). It is designed to map non-traditional areas such as rivers, remote locations and ultra-coastal zones. The robustness of the Hydroball instrument supports bathymetric data acquisition in turbulent waters, allowing hydrographers and companies (and field stations!) to map unknown areas with high precision and accuracy.

Figure 1. The Hydroball. A bathymetric instrument used to map and chart bodies of water in high accuracy.

Bathymetry, the study of underwater topography, is fundamental to the studies of oceans, seas and lakes. Bathymetric data, including information about the depths and shapes of underwater terrain have a range of important uses. As of the year 2000, the National Oceanic and Atmospheric Administration estimated that as much as 95% of the world’s oceans and 99% of the ocean floor remained unexplored (NOAA, 2010). The rise of technology including remote sensing and bathymetrical devices such as the Hydroball have opened up opportunities for offshore exploration. By mapping and analyzing the floors of lakes and oceans, scientists can study circulation patterns, marine biology, geophysical properties and sites. In essence, bathymetric data provide valuable information about water depth and topography of lakes and oceans, which are significant for many aspects of marine research, administration, and spatial planning of coastal environments and their resources. Bathymetric maps are increasingly important as scientists learn more about the effects of climate change on our environment.

Figure 2. A previous bathymetric image of Lake Opinicon. Similar to how topographic maps represent three dimensional features of overland terrain, bathymetric maps illustrate the land that lies beneath the water.

The data acquisition was completed during the period of of July 3rd to16th and from July 15th – 22nd thanks to the amazing team efforts of QUBS staff and members from Dr. Stephen Lougheed’s lab (QUBS Director). Many long hours were spent on the water collecting data (Figure 3), as well as in the GIS room ‘cleaning and processing’ the millions of points collected. On the boat, we used ‘Survey’ software to visualize our progress in covering the Lake Opinicon grid that we had created. A Sound Velocity Profiler (SVP) instrument was used to determine the speed sound tab which the boat was moving through the water as we were collecting data. The software, combined with the technology of the Hydroball proved to be a reliable and robust system which yielded high quality of data.

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Once data collection was completed over the time that we had the instrument, the next step was to process and clean the data. A program called ‘Depthstar’ visualized our collected data on a navigation map platform (Figure 4). From here, we scanned through point clouds of data to remove (clean) obvious anomalies in the data set. Post collection cleaning included adding Precise Point Processing (PPP) data to the raw data to georeference the points, and improving the accuracy and reliability of the data. The processed skeletal data was moved into Arc software to create the Digital Terrain Models (DEM). This process required a lot of patience (and coffee) as we collected over 6 million points over the 14 days of data collection!

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The biggest lesson I’ve learned from this project is the importance of quality data for an effective research data management plan. For data to be maximally relevant, it must be current and up to date. With such contemporary data, research organizations like QUBS are better equipped to provide accurate data for research questions. Another significant lesson learned from this project is the importance of strong organizational and communication skills. Effective communication led to a successful execution of data collection and management. Communicating questions and concerns directly with the team members allowed us to foster collaboration and to innovate and problem-solve, ultimately allowing us to attain the goals of this project.

The Hydroball project was a highlight of our summer here at QUBS. Being a part of every step of the process from data acquisition, processing, management and application was incredibly rewarding. We have definitely gained a new appreciation for sunrises above Lake Opinicon, even though it meant waking up at 4:45am to start collecting data! The final product of our work will be a detailed, high accuracy bathymetric map of a significant portion of Lake Opinicon. This information will be further used for multiple research projects at QUBS for many years to come.

Thank you to Kevin J. Wilson from CIDCO for providing us with the training and guidance to use the Hydroball at QUBS. Also thank you to Lougheed lab members and other QUBS SWEP 2018 staff for assisting in the data collection; this project would not have been possible if it wasn’t for your generous help!

Sources:

  1. US Department of Commerce, & National Oceanic and Atmospheric Administration. (2009, January 01). How much of the ocean have we explored? Retrieved from https://oceanservice.noaa.gov/facts/exploration.html

Freeze up and thaw dates for Lake Opinicon, 1985-2010

Posted by: Mark Andrew Conboy and Philina English

In recent years a great deal of attention has been paid to monitoring phenological changes in organisms and annual events such as ice cycles on lakes. Longterm datasets are an invaluable resource for studying changes over time, especially in the face of rapidly rising global temperatures and associated climate change. Frank Phelan and Floyd Connor [Manager and Assistant Manager (until Feb. 2010) respectively] have kept track of the date of freeze-up and thaw of ice on Lake Opinicon since 1985. Here we summarize this data (Table 1).
Lake Opinicon is located on the Rideau Canal system in the Cataraqui-Gananoque Watershed. QUBS sits on the northwest shore of this lake. The lake has an area of 788 ha with approximately 61 km of shoreline (including islands). The mean depth is 2.8 m and the maximum measured depth is 11.3 m. Researchers use Opinicon extensively for studies of a variety of taxa including water mites, odonates, fish, turtles and plants, therefore making an understanding of lake ice phenology very important. Furthermore, changes in date of freeze-up and thaw can act as a proxy for monitoring climate change (Magnuson et al 2000; Futter 2003).

Figure 1. Dates of complete freeze-up of Lake Opinicon (1985-2009). There are missing records for the years 1987, 1991 and 2002. At the time of this blog post Lake Opinicon had not frozen for 2010. * The 2006 freeze-up took place in January of 2007. Click on picture to see a larger version of this image.

For our purposes the date of freeze-up means the day on which no more open water is found on Lake Opinicon. This is the formation of permanent ice with no patches of open water subsequently forming until the thaw. It is important to note that there is almost always some open water on Lake Opinicon where strong currents from in- and outflows preclude ice formation (i.e. Chaffey’s Lock, Davis Lock and Deadlock Bay) so complete freeze-up refers to all but these small areas. The earliest complete freeze-up on record (22 years) was on 24 November 1995. The latest was 1 January 2007 (for the winter of 2006-07) (Figure 1). The median day of freeze up is 9 December. We are missing records for the years 1987, 1991 and 2002 and at the time of this blog post Lake Opinicon had not frozen for 2010 (there was skim ice between Rabbit Island and Cow Island on November 6 and skim ice from shore to shore on November 23 that was later broken up by wind and waves. Some of the back bays have been frozen for a few days at a time but that ice is still ephemeral).

Date of thaw is the day on which generally no more ice is present on Lake Opinicon. At this date there is certainly no more fast ice (ice attached to shore) but a few small floating pieces may still be present, however in general there is no more ice left on the lake. The earliest complete thaw (26 years) was 26 March 2000. The latest was 23 April 1992 (Figure 2). The median day of thaw is 12 April.

Figure 2. Dates of complete thaw of Lake Opinicon (1985-2010). Click on picture to see a larger version of this image.

The longest duration of winter ice cover (22 years) was 143 days in the winter of 1995-96. The shortest was 97 days in the winter of 1999-2000 (Figure 3). The mean duration of ice cover on Lake Opinicon is 119 days. We could not calculate the duration of ice cover for the winters of 1987-88, 1991-92 and 2002-03 because of unknown dates of freeze-up.

Though some other Ontario lakes have shown a trend toward a longer ice-free season since the 1970’s (Futter 2003) there is no such trend apparent in the QUBS data. Clearly there is dramatic year to year variability in the timing of freeze-up and thaw events at Lake Opinicon. It

Figure 3. Days of ice cover on Lake Opinicon for the winters 1985-86 through 2009-10. Ice cover could not be calculated for the winters 1987-88, 1991-92 and 2002-03 because of unknown dates of freeze-up.

will likely take several more years before any trend that could be indicative of longterm climate change becomes evident.

Works Cited

  1. Futter, M.N. 2003. Patterns and trends in Southern Ontario lake ice phenology. Environmental Monitoring and Assessment 88: 431-444.
  2. Magnuson, J.J., Robertson, D.M., Benson, B.J.,Wynne, R.H., Livingstone, D.M., Arai, T., Assel, R.A., Barry, R.G., Card, V., Kuusisto, E., Granin, N.G., Prowse, T.D., Stewart, K.M. and Vuglinski, V.S. 2000. Historical trends in lake and river ice cover in the northern hemisphere. Science 289: 1743–1746.

New Article on the Soils and Geology of QUBS.

Geology, soils, drainage and climate interact to determine the distribution of species and patterns of vegetation. The bedrock and soils of the Queen’s University Biological Station and environs(extending from the north shore of Lake Ontario onto the Canadian Shield) are no exception. Paul Grogan of the Queen’s Dept. of Biology has written a nice synopsis of this and we recently posted it | here |. Please check it out!