Poster Number 331
See more from this Division: Topical Sessions
See more from this Session: Sigma Gamma Epsilon Undergraduate Research (Posters)
Abstract:
Baseline data consisting of bolthead-to-rock surface distances were collected and georeferenced with GPS to create an initial dataset from which to compare future measurements. A specially designed micrometer Rock Erosion Meter (REM) (Allred, 2004) was utilized to measure the lowering of rock surfaces adjacent to the bolts. This measuring tool was built from a Brown and Sharp 608 model micrometer by Allred. The carbide-tipped measuring rod is able to able to measure depths between 25.4-76.2 mm from the rock bolt head. Comparative studies in southern southeast on karst surfaces in Alexander terrane carbonates have yielded dissolution rates ranging from 31 mm/ka in forested terrains to 38 mm/ka in alpine settings. Runoff from acid peat bogs produced dissolution rates of 1.66 m/ka, which are amongst the highest rates in the world. We anticipate much lower rates for the weathering of newly deglaciated, mostly siliclastic rocks in the Juneau Area. Measurements will be repeated through time across this bolt array.
See more from this Division: Topical Sessions
See more from this Session: Sigma Gamma Epsilon Undergraduate Research (Posters)