Ecological Impacts of the Landslide Manipulations at the McWay Slide, Big Sur Coast, and Management Recommendations

Contents

A1. Summary of Findings

A2. Introduction

A3. Background

A3.1. Movement of Sediment through the Marine Environment

A3.2. Ecological Effects of Landslides and Debris Disposal

A3.3. Habitat Burial

A3.4. Suspended Sediment Plumes

A3.5. Sand Scour of Rocky Habitats

A3.6. Landslide Debris Disposal Options Along Highway One

A4. Recommendations for Best Management Practices

A4.1. Landslide Prevention/ Landslide Stabilization

A4.2. Landslide Debris Disposal

A4.3. Monitoring

Section B Technical Report

B1. Study Area

B2. Physical Studies

B2.1. Seafloor Mapping, Bathymetry and Side Scan Sonar

B2.1.1. Methods

B2.1.1.1. Bathymetry

B2.1.1.2. Survey Preparation and Data Collection

B2.1.1.3. Data Processing, Analysis, and Map Production

B2.1.1.4. Side Scan Sonar

B2.1.2. Results

B2.1.3. Discussion

B2.2. Grain Size Analysis of Sediments

B2.2.1. Methods

B2.2.1.1. Sieve Analysis

B2.2.1.2. Hydrometer Analysis

B2.2.1.3. Data Analysis

B2.2.2. Results

B2.2.2.1 Intertidal

B2.2.2.2 Subtidal

B2.2.3. Discussion

B2.3. Plumes

B2.3.1. Methods

B2.3.2. Results

B2.3.3. Discussion

B2.4. Beach Profile

B2.4.1. Methods

B2.4.2. Results

B2.4.3. Discussion

B2.5. Slide Recession

B2.5.1. Methods

B2.5.2. Results

B2.5.3. Discussion

B2.6. Aerial Photographs

B2.6.1. Methods

B2.7. Bedload Transport

B2.7.1. Methods

B2.7.2. Results

B2.7.3. Discussion

B2.8. Rainfall

B2.8.1. Methods

B2.8.2. Results

B2.8.3. Discussion

B3. Biological Surveys

B3.1. Subtidal Pinnacle and Kelp Forest Communities

B3.1.1. Methods

B3.1.2. Video Transects

B3.1.3. Video Quadrats

B3.2. Photoquadrats

B3.2.1. Results

B3.2.2. Discussion

B3.3. Terrestrial Vegetation

B3.3.1. Methods

B3.3.2. Results

B3.3.3. Discussion

B3.4. Hazard Survey Studies

B3.4.1. Methods

B3.4.1.1. Hazard Site Selection

B3.4.2. Results

B3.4.3. Discussion

B4. Acknowledgements

B5. References

List of Figures

List of Tables

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