GPR as a regional geomorphic mapping tool: shoreline accretion/erosion along the columbia river littoral cell

摘要

Over the past century, the shoreline along the Columbia River littoral cell (southwest Washington to northwest Oregon) has been substantially accretional. Recently, however, the growth trend has slowed throughout the region and has reversed in at least one area (Grays Harbor jetties), yielding the potential for costly damages. The large study area and the lack of longterm (prehistoric) shoreline change data, created the need for a regional subsurface database. Therefore, an extensive ground penetrating radar (GPR) survey was conducted to study prehistoric and historic barrier accretion and erosion.