Title

Potential mitigation regarding geologic hazards: US Highway 101, Beverly Beach State Park, central Oregon Coast

Date

5-30-2013 11:30 AM

Location

Health and Wellness Center (HWC) Room 105

Department

Earth Science

Session Chair

Jeff Myers

Session Title

Earth Science Senior Seminar Research: Geological Hazards Impacting US 101 at Beverly Beach, Oregon, and their Mitigation

Faculty Sponsor(s)

Jeff Myers

Presentation Type

Presentation

Abstract

The rocks and geologic structure of the central Oregon coast contribute to the steady soil creep and landslides which distort Highway 101 into an ever changing, roller coaster drive near Beverly Beach State Park. Mitigation of stability problems which are caused by coastal erosion in the area, the hydrology, as well as the stratigraphy and sedimentology of the Astoria Formation and overlying terraces, present challenges to keeping the highway from slipping further west. Mitigation approaches that could stabilize Hwy 101 are governed by land-use and beach protection regulations passed during the 1967, 1972, and 1977 legislative sessions. From pinning the formation to moving the roadbed, this presentation examines sites in the Oregon Coast Range with similar hazards, and their effectiveness in reducing earth movement. Examination of these may reveal a strategy, or combination thereof, that could prove to be successful in keeping Hwy 101 together.

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May 30th, 11:30 AM

Potential mitigation regarding geologic hazards: US Highway 101, Beverly Beach State Park, central Oregon Coast

Health and Wellness Center (HWC) Room 105

The rocks and geologic structure of the central Oregon coast contribute to the steady soil creep and landslides which distort Highway 101 into an ever changing, roller coaster drive near Beverly Beach State Park. Mitigation of stability problems which are caused by coastal erosion in the area, the hydrology, as well as the stratigraphy and sedimentology of the Astoria Formation and overlying terraces, present challenges to keeping the highway from slipping further west. Mitigation approaches that could stabilize Hwy 101 are governed by land-use and beach protection regulations passed during the 1967, 1972, and 1977 legislative sessions. From pinning the formation to moving the roadbed, this presentation examines sites in the Oregon Coast Range with similar hazards, and their effectiveness in reducing earth movement. Examination of these may reveal a strategy, or combination thereof, that could prove to be successful in keeping Hwy 101 together.