Landslide & Coastal Erosion Risk Reduction at Oregon s Water/Wastewater Networks
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1 Landslide & Coastal Erosion Risk Reduction at Oregon s Water/Wastewater Networks Laura Gabel, RG (with Bill Burns, RG & Jonathan Allan, Ph. D) Oregon Department of Geology and Mineral Industries (541) Laura.Gabel@dogami.state.or.us
2 Overview Landslides Inventory - Evidence of historic & pre-historic landslides Susceptibility - Likelihood of future failure Projects: Bull Run Watershed City of Astoria Coast Range Watersheds Coastal erosion Low-lying areas prone to many coastal hazards Case studies: Port Orford, Curry County Cape Lookout State Park, Tillamook County Harbor, Curry County
3 Project: Bull Run Watershed
4 Project Overview Portland Water Bureau Funded DOGAMI Directly Tasks: Landslide Inventory Shallow Landslide Susceptibility Deep Landslide Susceptibility Primary Concerns: Structural damage to water system Sediment Special Paper 46
5 Previous Landslide Inventories = 249 Landslide Areas Cover ~5%
6 New Landslide Inventory = 1,068 Landslide Areas Cover ~15%
7 Previous Topo and Landslides
8 Fall Creek Lidar Topography
9 Fall Creek New Landslides
10 Historic / Pre-Historic Landslide Relationship
11
12 Deep Landslide Susceptibility Shallow Landslide Susceptibility
13 Project: City of Astoria
14 Project Overview FEMA Post Disaster Funds (December 2007 storm) Tasks: Landslide Inventory Shallow Landslide Susceptibility Deep Landslide Susceptibility Risk Analysis
15 History of Landslides Major slide in 2007 right near downtown Slides in the hills
16 Astoria - Air Photo Downtown
17 2m Lidar DEM Hillshade
18 1954 Landslide Inventory
19 Susceptibility (low, moderate, High) Shallow Landslide Susceptibility 55% High Deep Landslide Susceptibility 37% High
20 Results 120 landslides inside the city limits 83 are historic (<150 years old) 17 have recorded dates of movement and damage ( ) Open-File Report O-13-05
21 Project: Coast Range Watersheds EPA and DEQ Concerned about sediment in water DOGAMI collect lidar Map landslides North Fork Siuslaw Big Elk Creek
22 Results Landslides North Fork Siuslaw Previous Mapping: 9 Landslides in SLIDO (mostly 1974) Graham (1985) 11 slides and 25 debris flows (70s, 80s) : 40 landslides New Study 1,323 landslides cover 26% 97 shallow, 829 deep, 379 debris flow fans 698 are historic (~50%)
23
24 Results Landslides Big Elk Creek Previous Mapping: 37 Landslides in SLIDO (mostly 1973) : 139 landslides New Study 1,517 landslides cover 37% 105 shallow, 1,083 deep, 326 debris flow fans 402 are historic (~25%)
25 Open-File Report O-12-07
26 Chronic hazards Coastal erosion Winter storms Sea level rise Cascadia Subduction Zone Earthquake Dam failure Ground deformation Landslides Liquefaction Subsidence Tsunami Coastal hazards
27 Port Orford Secondary water source Flooding Remnant sewer drain field Lake can t drain OPRD canal ~$2 mil
28 (February 16, 1999)
29 June 1978 Cape Lookout State Park (Netarts Spit) Erosion November 1984 El Nino (Paul D. Komar Photos)
30 El Niño Erosion: La Niña 2/19/2016 Erosion
31 Cape Lookout State Park Drain fields #3 - LOST #2 - LOST Drain field #1 New drain field (approx location) Abandoned restroom site N
32 Harbor Water Issues Images from the State of Oregon s HUD NDRC application
33 Shoreline change Rockaway Beach (1997) Alsea Spit Gold Beach -300 ft ~260 ft -100 ft ft 2008 present Photos courtesy of Don Best, Best Impression
34 Looking forward: what can we expect? More extensive coastal inundation Increased coastal erosion (e.g. due to storm intensity and/or frequency, ENSO etc.) More severe storm surge flooding Saltwater intrusion into estuaries and freshwater aquifers Altered tidal ranges Changes in sedimentation patterns Impact to jetties & other coastal structures Note: These impacts will vary regionally as well as locally
35 Options for Hazard Mitigation Let nature take its course (i.e. do nothing!) Construct a conventional coastal engineering structure e.g. sea wall, rip rap revetment, or offshore breakwater Beach renourishment Construct a cobble berm/dynamic revetment Adopt coastal hazard setback (no build) zones Relocate further landward 2/19/2016
36 Coastal Hazard Mapping Two approaches: -Beaches (geometric model/quasi-deterministic) -Bluffs (geologic mapping, erosion rates, block failure widths + FOS) Broad Purpose: -Assist County planners with up-to-date knowledge of geologic hazards and with their land-use planning
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