Paper No. 97-3 TOWARDS  A MARINE LIMIT USING THE BRITISH COLUMBIA TERRAIN MAPPING DATABASE



Paper No. 97-3
Presentation Time: 8:40 AM

TOWARDS  A MARINE LIMIT USING THE BRITISH COLUMBIA TERRAIN MAPPING DATABASE


PAPER WITHDRAWN
The northern British Columbia Coast has a complex sea level history. Maximum sea levels range from 230m asl to sea level, with submerged surfaces in a forebulge zone. Terrain maps provide details of glaciomarine sediments and also deltas graded to sea level. The former provide minimum incursion elevations, and the latter depict temporary sea levels. Shoreline features such as beach ridges and wave-cut terraces are generally not shown on terrain maps, but these may be visible on detailed digital elevation models.

Depicting the marine limit is important for identifying possible areas of sensitive clays. Landslides in these sediments can occur without warning and travel long distances rapidly over very low gradients, placing populations and infrastructure at risk. Geohazards associated with glaciomarine deposits take on an increased importance with the number of gas and oil pipelines being proposed to traverse some of the coastal valleys of northwestern BC.

Session No. 97

T97. Landslides with Flow Characteristics: From Glaciomarine Sediment to Mountains with Degrading Permafrost
Monday, 20 October 2014: 8:00 AM-12:00 PM
Vancouver Convention Centre-West 213
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.251
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