Sunrise Park and Beach Preliminary Engineering / Consulting Erosion - - PowerPoint PPT Presentation

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Sunrise Park and Beach Preliminary Engineering / Consulting Erosion - - PowerPoint PPT Presentation

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Lake Bluff Park District Sunrise Park and Beach Preliminary Engineering / Consulting Erosion Study June 17, 2019 Study Purpose Study is an Outgrowth of Erosion Impacts Caused by High Lake Levels Sand Losses Permanent Loss of Base

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Sunrise Park and Beach

Preliminary Engineering / Consulting Erosion Study

Lake Bluff Park District

June 17, 2019

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Study Purpose

Lake Bluff Beach Erosion Study 2

– Study is an Outgrowth of Erosion Impacts Caused by High Lake Levels

– Sand Losses

  • Permanent Loss of Base Clay that Underlies Sand
  • Beach Erosion
  • Protection of Bluffs

– Evaluate Preventative Measures that Address Current Damage and Anticipated Future Damage – Plan Now to Preserve the Beach Asset: Current High Water Lake Levels are similar to Historic Conditions in the 1970’s and 1980’s

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Beach Sand Loss

Lake Bluff Beach Erosion Study 3

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Beach Clay Foundation Soil Loss

Lake Bluff Beach Erosion Study 4

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Beach Condition Stressors

Lake Bluff Beach Erosion Study 5

– Wave Induced Beach Erosion in Surf Zone

Sand Erosion Clay Erosion

Normal Conditions – Sand Ebbs and Flows to & From Beach High Water Storm Conditions: *Sand Erosion Exposes Clay to Direct Wave Attack in Surf Zone

* Native Stiff Clay Loss is permanent * Deep Water Allows Larger Waves to Approach Bluff Toe

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Report Content

Lake Bluff Beach Erosion Study 6

– Project Introduction and Background – History of the Lake Bluff Park District’s Sunrise Beach – Existing Site Conditions Evaluation – Site Plan Analysis – Engineering Design for Selected Options

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Historic Beach and Bluff Damage

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Lake Bluff Beach Erosion Study 7

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Historic Damage & Restoration (Central Beach)

Lake Bluff Beach Erosion Study 8

– Restroom/Guard Building Erosion (1973\1975)

Looking North

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Historic Damage & Restoration

(Central Beach)

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  • Restroom/Guard Building

Erosion (1973\1975)

Looking South

Lake Bluff Beach Erosion Study

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Central Beach Restoration

Lake Bluff Beach Erosion Study 10

– 188’ Steel Groin Constructed (1976) - North Cell Breakwater Constructed (2000)

1998 Photograph 2017 Photograph

Restroom/Guard Building Eroded West Groin End

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Historic Damage & Restoration (North of Dog Beach)

Lake Bluff Beach Erosion Study 11

– Bluff Erosion (Early 1970’s)

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Restoration

(North of Dog Beach)

Lake Bluff Beach Erosion Study 12

  • - Armor Stone Revetment (Constructed 1988)
  • Successful Erosion Protection
  • Unusable Beach – Safety Concerns in Park

Setting

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Historic Damage & Restoration (South Beach)

Lake Bluff Beach Erosion Study 13

– Bluff Failure (1970’s)

Looking South from Parking Lot NSWRD South Beach Area Bluff Failure

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South Beach Restoration

Lake Bluff Beach Erosion Study 14

– Breakwater Constr. & Bluff Restoration (Constructed 1991)

2018 Photograph

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Recent Damage

Lake Bluff Beach Erosion Study 15

– South End Central Beach –

  • Beach and Clay Lakebed Erosion

– Central Beach North and South Cells

  • Beach and Lakebed Erosion

– Parking Lot & Groin Damage – South Beach Erosion

South Beach Parking Lot

South End Central Beach

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Recent Damage

Lake Bluff Beach Erosion Study 16

– South End Central Beach

  • Beach and Clay

Lakebed Erosion South End Central Beach

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Recent Damage

Lake Bluff Beach Erosion Study 17

Central Beach South Cell

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North Beach

Lake Bluff Beach Erosion Study 18

– Dog Beach–

  • Cobbles Dominate the Beach Surface
  • Rubble Pile

Lake Bed Erosion

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Recent Nearby Beach & Bluff Damage

Lake Bluff Beach Erosion Study 19

Lake Forest

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Recent Nearby Beach & Bluff Damage

Lake Bluff Beach Erosion Study 20

Lake Bluff

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Beach Formation & Erosion Factors

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Beach Condition Stressors

Lake Bluff Beach Erosion Study 22

– Lake Level Fluctuations (Monthly Average Lake Levels)

  • High Water allows larger waves to make it to shore without breaking and increases erosion potential

Record High Level Up to 6’ Fluctuation >>>High Water Period

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Beach Condition Stressors

Lake Bluff Beach Erosion Study 23

– Storm Surge (Wind Setup)

  • Wind Storms can cause up to 3.5’ or more of Lake Level Rise

Wave Storm 2.5’ Level Fluctuation Lake Michigan Level (October 2014 - 24 hour Storm)

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Beach Condition Stressors

Lake Bluff Beach Erosion Study 24

– Wave attack

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Beach Formation Dynamics!

Lake Bluff Beach Erosion Study 25

– Littoral Drift – Shoreline Character – Influence of Coastal Structures – Wave Climate – Beach Sand Sources:

  • Rivers
  • Ravines
  • Shoreline Erosion
  • Bluff Erosion
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Sunrise Beach Sand Formation Dynamics!

Lake Bluff Beach Erosion Study 26

– Littoral Drift – Shoreline Character – Influence of Coastal Structures – Wave Climate – Beach Sand Sources:

  • Rivers
  • Ravines
  • Shoreline Erosion
  • Bluff Erosion
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Existing Sunrise Beach Sand Formations

Lake Bluff Beach Erosion Study 27

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Existing Sunrise Beach - Geometry

Lake Bluff Beach Erosion Study 28

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Existing Sunrise Beach – Historic Beach Waterline Positions

Lake Bluff Beach Erosion Study 29

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Engineering Design for Selected Options

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Lake Bluff Beach Erosion Study 30

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Base Option

Lake Bluff Beach Erosion Study 31

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Base Option

Lake Bluff Beach Erosion Study 32

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Base Option - Comparison

Lake Bluff Beach Erosion Study 33

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Base Option – Opinion of Probable Cost

Lake Bluff Beach Erosion Study 34

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Expanded Base Option

Lake Bluff Beach Erosion Study 35

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Expanded Base Option

Lake Bluff Beach Erosion Study 36

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Expanded Base Option Comparison

Lake Bluff Beach Erosion Study 37

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Expanded Base Option- Opinion of Probable Cost

Lake Bluff Beach Erosion Study 38

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Base Option with Lakefill Expansion

Lake Bluff Beach Erosion Study 39

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Base Option with Lakefill Expansion

Lake Bluff Beach Erosion Study 40

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Base Option with Lakefill Expansion –

Section Options

Lake Bluff Beach Erosion Study 41

TALL TREE OPTION LOW LEVEL VEGETATION AND BERM

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Base Option with Lakefill Expansion - Comparison

Lake Bluff Beach Erosion Study 42

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Base Option with Lakefill Expansion- Opinion of Probable Cost

Lake Bluff Beach Erosion Study 43

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2013 Master Plan Island Breakwater Concept

Lake Bluff Beach Erosion Study 44

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Sunrise Park and Beach

Preliminary Engineering / Consulting Erosion Study

Lake Bluff Park District

June 7, 2019