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A seiche is a standing wave oscillating in a body of water, like the water that sloshes back and forth in a bathtub or cup of water when disturbed. They typically occur in enclosed waterbodies such as lakes, reservoirs, or even swimming pools. These waves can be surface waves or internal waves. What causes a seiche? They are typically caused by strong winds and rapid changes in atmospheric pressure that push water from one end of a water body to the other. After the wind event, the water rebounds to the other side of the enclosed area and continues to oscillate back and forth for hours or even days, depending on the size of the lake.
Seiches may be noticed under ordinary water conditions as a result of periodic changes in water level or underwater currents associated with the oscillating movement. At some locations and times, these sea-level oscillations and currents may produce hazardous or even destructive conditions. Internal waves form that can be as high as 10 to 30 meters, all unseen from the lake surface.
Seiche waves generate currents and turbulence that rhythmically flow back and forth. These currents can cause bottom water to come to the surface, and can also mobilize lake sediments and carry them into the water.
To learn more about seiches, watch the video from Larratt Aquatic Consulting Ltd.
Stevens, C. L., & Lawrence, G. A. (1997). Estimation of wind-forced internal seiche amplitudes in lakes and reservoirs, with data from British Columbia, Canada. Aquatic Sciences, 59(2), 115-134. https://bit.ly/3dbjUV1
Members Needed for the BCLSS AGM
We still need more members to register for the Annual General Meeting! In order for us to reach quorum at the AGM, we require a minimum of 17 members in good standing. The BCLSS AGM will be held via Zoom on Wednesday, September 29th from 12 pm – 1 pm PDT. Please register here. An agenda and AGM package will be emailed to you upon registration.
Did you participate in Secchi Dip-In this year? If so, please submit your completed forms on our website or send to marie@bclss.org by September 30th, 2021. If you took Secchi readings as part of the BC Lake Stewardship and Monitoring Program during the month of July, you can use that data to participate in the Secchi Dip-In, just fill out this form and submit. The Secchi Dip-In provides a snapshot of lake water quality throughout the province as well as the rest of the world. Scientists and volunteers can get a sense of how transparency varies according to water type, regional geology, and land use. Thank you to those who have already sent in their forms! So far we have received data from over 30 lakes across BC.
BCLSS Q & A Session
Are you interested in learning more about the BCLSS and how we can help protect your local lake? Do you have questions about lake water quality and ecology? Would you like to know more about our programs and how you can participate?
Join our Q and A Session on Wednesday, October 13th at 12 pm (PDT) to have your questions answered!
Habitat Conservation Trust Foundation Stewardship Grants HCTF recognizes the importance of environmental stewardship and invests in projects that create stewards. Stewards include individuals, practitioners, and community organizations who take responsibility for promoting, monitoring, conserving, and restoring ecosystems to ultimately result in enduring conservation outcomes for fish and wildlife and their habitats. HCTF prefers stewardship projects that create stewards through community-based, hands on engagement programs, including Citizen Science. Stewardship projects may include some on-the-ground components such as habitat restoration. Each year, HCTF provides approximately $600,000 in Stewardship Grants. There is no upper limit on funding requests but there is a 5-year limit to project funding. Stewardship Grant budgets typically range from $10,000 to over $80,000 annually, with an average grant of approximately $30,000. To learn more about this funding opportunity, visit the HCTF website.
BC Conservation & Biodiversity Awards This initiative is designed to support work to preserve our province’s pristine natural wilderness. Every year grants will be awarded of $10,000 to $50,000 to organizations and ideas making the greatest positive impact on the future of B.C. in these areas: - Land and ocean-based initiatives - Clean air and water initiatives - Climate change initiatives Academic and science-based studies targeting the environment and preservation of wilderness and biodiversity award applications are accepted throughout the calendar year to December 31, with the annual award winners then chosen by the Selection Committee and announced on March 1st of the following year. To learn more and apply for funding, click here.
Announcements and Reminders
ALMS 2021 Fall Webinar Series This year ALMS is hosting a webinar series to learn from experts from across North America on various lake related topics! This series will showcase presentations every Friday morning from September 10th - October 1st. Registration can be achieved through EventBrite. To view the webinar agenda and watch recordings of past webinars, visit the ALMS website here.
CALMS 2021: 36th Annual Symposium The California Lake Management Society will be hosting their annual conference on Zoom from Oct 4th to Oct 7th. Talks will begin at 12:00 and 12:30 daily. Presenters, topics and Zoom links will be posted here as they become available. To participate in the 2021 conference, click here to register.
2021 Go Fish BC Photo Contest The annual photo contest hosted by Freshwater Fisheries Society of BC is on again! Share your photos of fishing in B.C. and go in the running to win cash prizes and a weekly prize pack. Categories: 1. Luck on the Lake – for photos of anglers in action on lakes in B.C. 2. Fishing Buddies – for photos of your fishing buddy in action, whether it be a family member, friend, or pet 3. First Catch – for photos of a first catch - this can be first fish ever caught, first of a particular species caught, or first fish of the season. Prizes: For each category, the following cash prizes will be awarded: 1st Prize: $300 2nd Prize: $150 3rd Prize: $75 To learn more and submit photos, click here! Deadline to submit photos is October 31st, 2021.
S’amunu Make a Difference Day Please join the WildWings Nature & Art Festival community volunteers for a community cleanup of the S’amunu watershed streams. The Somenos Marsh Wildlife Society recently completed assessing the condition of the S’amunu/Somenos watershed streams and discovered that the most pressing issue is the amount of garbage in these streams and riparian corridors. The 2nd annual S’amunu Make a Difference Day is the day teams of volunteers, guided by Somenos Marsh Wildlife Society staff, clean up the mess left by others. Last year over 600kgs of garbage was removed. The SMWS hopes to double this effort this year. To register, visit their website here.
Stewardship Centre for BC Green Shores Survey Take the quick survey organized by the Stewardship Centre for BC and TransCoastal Adaptations #GreenShores and nature-based solutions for shoreline management. Visit this link to complete the survey and leave your email to be entered into a draw for a chance to win a compostable Pela Case for your phone. This survey runs all through September. A winner will be announced on October 1st!
NSWA Watershed Wednesdays Join the North Saskatchewan Watershed Alliance for Watershed Wednesdays this fall - an online speaker series the first Wednesday of each month (noon to 1 pm) on a variety of watershed topics including wetlands, whirling disease, and water quality. To register, click here.
Watersheds Canada September Webinars Shoreline Assessment Webinar: Sept 22. Have you ever wondered how to naturalize your shoreline? What should you and your family be looking for on your property that might impact water quality and wildlife habitat availability? Chloe and Monica from Watersheds Canada will walk you through a property assessment to show you what our staff look for on a property that can help protect freshwater health and provide crucial habitat for wildlife. Click here to register.
Invasive Species in Your Watershed: Sept 29. This webinar will touch on what makes a species invasive, pathways of spread, call to actions, and how to report sightings of invasive species. Click here to register.
Not a member of the BCLSS yet? Please consider joining our network of lake stewards! For more information on the benefits of membership, please visit our website.
The BCLSS gratefully acknowledges the financial support of the Government of British Columbia through the Ministry of Environment and Climate Change Strategy.
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