Natural Shoreline Landscapes on Michigan Inland Lakes · Natural Shoreline Landscapes on Michigan...
Transcript of Natural Shoreline Landscapes on Michigan Inland Lakes · Natural Shoreline Landscapes on Michigan...
Excerpts from Chapters 2 and 3 Excerpts from Chapters 2 and 3
Photo by Jane Herbert
Natural Shoreline Landscapes on Michigan
Inland Lakes
Photo by Jane Herbert
Twenty-four species of amphibians, 25 species of reptiles, 87 species of birds and 19 species of mammals are supported by Michigan inland lakes.
(O’Neal & Soulliere, et.al., 2006)
Did you know?
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Three ‘tiers’ of vegetation◦ Tree canopy
◦ Shrub understory
◦ Herbaceous plants Aquatic, wetland and upland
Natural Shorelines are stable shorelines
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Horizontal roots stabilize lake-bottom sediments
PROFUNDAL ZONE
Modified from: University of Minnesota Natural Resources Research Institute
PROFUNDAL ZONE
Provides critical habitat for at least 65 native fish species. ◦ Spawning ◦ Nursery◦ Feeding◦ Predator avoidance◦ Entire life cycle or seasonal use
Twenty of these 65 fishes are considered to be Species of Greatest Conservation Need 1
1Michigan Wildlife Action Plan (2005)
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Lawn to the water’s edgeLoss of fish and wildlife habitatNuisance animal habitatShoreline erosion and hardeningLoss of shadeDeadwood removal Sandy beach maintenancePolluted stormwaterExcessive plant growth and algae bloomsOxygen lossRecreation impactsChemical treatment
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Results of a study of 44 Minnesota lakes indicate (on average) a 66% reduction in emergent and floating-leaf vegetation in the presence of shoreline development.
Results of the same study indicate a positive relationship between the occurrence of emergent and floating-leaf vegetation and the abundance and size of certain fishes including:◦ Northern pike◦ Bluegill ◦ Pumpkinseed (Radomski and Goeman, 2001)
Loss of tiered vegetation and shade
Home Sweet Home
Adapted From: Wisconsin DNR
Reduce pollutants entering the lake
Adapted From: Wisconsin DNR
4x
18x
5x 6x
Phosphorus InputsPhosphorus Inputs
Runoff VolumeRunoff Volume
Sediment InputsSediment Inputs
In freshwater aquatic systems 1 unit of phosphorus can produce 500 times its weight in algae. (Wetzel, Limnology, 2nd Edition)
Identify upland cause(s) and source(s):Cause: overland runoff
Source: stormwater collecting on impervious surfaces
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Identify the causes and sources at water’s edge:Cause: Undercut bank and bank failure Source: Removal of long-rooted native vegetation plus
prolonged and repeated high water levels (level controlled lake)
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Consequences on inland lakes
PROFUNDAL ZONE
Modified from: University of Minnesota Natural Resources Research Institute
Wave energy flanking from neighboring sea wall
Wave energy at vertical sea wall
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Littoral zone vegetation provides wave attenuation.
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
…uses plants, plant products and special techniques to protect soil surface and create structure within the soil to withstand erosive forces.
Overarching concept of any bioengineering technique is the reintroduction of deep-rooted native plants, creating a system that mimics naturally stable shorelines.
Bioengineered shoreline erosion control: NOT for the faint‐hearted!
Fetch = Maximum uninterrupted distance across the lake from your location * Water Depth
Wind Speeds
Other factors
Depends on:
Wisconsin On-line Erosion Calculator
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
12 inches
Laketypes
Source: Four Townships Water Resources Council
How high does the water get?
Intensity and frequency can vary from year to year. Factors include:
•Freeze/thaw expansion and contraction•Lack of snow cover
•and/or…•Spring ice-out (break-up)
•Rate of warm up•Orientation of site to spring winds
Ice action along the shoreline
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 2: Understanding the Shoreline
Shapes and reshapes natural shorelines Ice ridges:◦ Lakes and shorelines come to a dynamic equilibrium◦ Removal of ice ridge give the lake the ‘advantage’ Result is shoreline recession
Water Table
Natural Shoreline Landscapes on Michigan Inland LakesWorkshop for Property OwnersChapter 4: Design Ideas
High Impact Lake Front Landscape. (Source: MSU Extension)
Lake Front Landscape integrating a more manicured approach with buffers. (Source: MSU Extension)
Lakefront Landscape: different approach. The upland and aquatic zones are outlined. (Source: MSU Extension)
Video: Restoration of a low to moderate energy shoreline
property
Natural shorelines can preserve and/or restore ecological benefits to our lakes.
Photo: Jane Herbert
Questions?
Shoreline and Shallow Conference: Challenges and Successes
March 11, 2015Kellogg Center, MSU
Huron River Watershed Council
MSU Extension
How do we evaluate the Health of a Stream and its watershed?
Riverine Components
(Instream Flow Council)
Water Quality
(US EPA)
HydrologyThe study of water. Hydrology generally focuses on the distribution of water and interaction with the land surface and underlying soils and rocks.
Natural systems were built and are maintainedby different magnitudes of discharge occurring over time and space. (Hill et al. 1991)
Fluvial Geomorpholgy'... the branch of science that studies the landforms associated with river channels and the processes that form them..' (Kellerhals and Church 1989)
Pattern(plan view)
Radius of Curvature
ProfileRiffle
Pool
General Stream Bed Slope
Main ChannelPoint BarFloodplainDimension(cross-section)
Dimension, Pattern, Profile, & Floodprone WidthYield 4 ratios used for stream reach classification
2. W/D ratio = WidthbkfDepthmean
3. Sinuosity = Channel LengthValley Length
4. Slope = Elevation differenceChannel length
1. Entrenchment Ratio = Flood-Prone WidthBankfull Width
All of these ratiosdefine how a streamand its valley handlethe energy of flowingwater, sediment, anddebris
Meandering reduces the slope, or steepness, of a stream (or a road)
PATTERN
Pages 4‐39 to 4‐47
Pattern and Profile are Intimately Linked
Pattern
Profile
Comparison of “designed” channel dimensions and pattern with a natural channel.
where: is the specific weight of the
fluid, D is the mean depth, and S is the water surface slope.
Sheer stress
(Rosgen)
Shape of channel affects sediment transport
Ditches are designed to transport water more quickly.
But ditches are inefficient attransporting sediment.
Natural, meandered channelsare the most efficient at transporting both water andsediment
Stream Stability
“Ability of a stream to transport the water & sedimentof its watershed in such a manner as to maintain itsdimension, pattern, and profile, over time, withouteither aggrading or degrading.”
Rosgen and Silvey, 1996
Connectivity
(Instream Flow Council)
Lateral Connectivity
Longitudinal Connectivity
Biology
Habitat•Depth•Velocity•Substrate – bottom material•Cover – hiding
•Avoid being eaten•Eat others (ambush)
Questions?