Options for Managing Coastal Erosion. Presentation by: Ashley Sprague
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1 Options for Managing Coastal Erosion Presentation by: Ashley Sprague
2 Shoreline stabilization methods Armouring - Boulders/rockwalls most common method of erosion control in Nova Scotia Concerns: - Accelerate erosion - Impact coastal processes - Cut off sediment supply - Access
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7 Soft approaches Fewer people using this approach Range of native, salt tolerant species Benefits: - Allows coast to function naturally - Habitat, water quality benefits Concerns: - High energy systems
8 Before you build Consider a vegetated setback
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10 Living shorelines: An alternative approach Aim to optimize natural functions of the shoreline, while reducing erosion risk Upland area + intertidal zone + shallow water habitat = combined protection benefits
11 Integrated Coastal Management Natural shorelines are dynamic, interconnected and provide many functions Any action has the potential to adversely affect ecosystem services onsite and on larger scale All elements of the shoreline should be considered simultaneously when making a decision
12 How do we decide? Decision tree Different sites require different solutions Factors considered: -Level of bank erosion, bank height -Presence of vegetation, marsh, beach -Wave energy/exposure -Water depth
13 Decision Tree Principles 1) Shorelines should be left in their natural condition unless erosion has the potential to result in significant loss of property 2) Preserve and enhance natural shoreline elements where possible; and 3) Where impacts are unavoidable, locate erosion control treatments where they will have the least overall impact to ecosystem function
14 Fetch Distance across open water over which wind blows and waves are generated Fetch and water depth influence wave height and energy
15 Banks Level of erosion? (low or high) Forested shoreline? Bank height - < 30 feet- Maintain vegetation and prevent large tree falls - > 30 feet - Grade bank and use good upland management practices to prevent further erosion
16 Bank grading - Reduce the steepness of a slope (allow for wave run-up and improve vegetation growing conditions) Before After
17 Presence of a Marsh? Roots and grass stems provide erosion protection Wider marshes = more wave reduction and protection < 15 ft - encourage growth > 15 ft - maintain marsh Can t force it
18 Marsh Restoration Before After
19 Marsh Expansion A low fetch (< ½ mile) can provide ideal wave conditions for marsh expansion Fill may be needed May require fibre log until roots from the plants are fully established
20 Marsh Sill Higher fetch areas Low-profile stone structure, allows marsh formation /restoration placement depends on bank height, water depth and bottom type
21 Beaches - Nourishment
22 Beaches - Breakwaters An off-shore structure to deflect force of incoming waves and contain sand beach May be needed in actively eroding areas
23 Living Shorelines in Nova Scotia EAC Future project Property assessments with expert team Identify and implement alternative methods Monitor resiliency
24 Overland erosion More high intensity rainfall events Increased area of impervious surfaces High volume and rate of runoff Can lead to erosion issues
25 Stormwater Management Approach to reducing runoff volume, rate and pollutant load Best Management Practices aim to work with natural systems to promote infiltration, evaporation and water capture/reuse Slow it, spread it, sink it Bioretention area
26 Individual Property Level Reduce impervious surfaces Encourage water infiltration, capture and reuse Opportunities: driveways, rooftops, lawns, plant trees Rain barrel Costco.ca Rain garden N
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28 Neighbourhood Opportunities: parking lots, streets, buildings Vegetated islands Bioswale
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30 Take home messages There are options for shoreline stabilization all will have impacts Allow coast to do the work: - Maintain existing vegetation - Consider options before attempting shoreline hardening Working with neighbours will benefit everyone Blog
31 Resources Decision Tree Manual: Contact: Ashley Sprague, Restoration Coordinator Phone:
Karen A. Duhring Marine Advisory Scientist Center for Coastal Resources Management Virginia Institute of Marine Science College of William & Mary
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