Water Stewardship Information Sources
| ID | 685 |
|---|---|
| Citation | Fuller, T. 2002. Sediment coring at Swansea Point fan delta, Mara Lake, British Columbia - Application of a coring method to determine historical debris flow events. Technical Report 003. BC Ministry of Forests and Range. |
| Organization | FLNRO |
| URL | http://www.for.gov.bc.ca/hfd/pubs/Docs/Tr/Tr003/Fuller.pdf |
| Abstract/Description or Keywords | A large landslide fl owed down Hummingbird Creek to Mara Lake in July 1997. Archival research and historical map and air photo investigations suggested that other fl ood or debris fl ow events have occurred since the mid-1930s. The community of Swansea Point and Highway 97A are located on this fan delta. There is a need to determine magnitude and frequency of debris fl ows impacting alluvial fans in the southern Interior of British Columbia and this offers one example. Sediment coring with a modifi ed Livingstone corer was used in Mara Lake to obtain metre-long cores around the perimeter of the fan. Cores were logged and measured for magnetic susceptibility. Samples from one core were analyzed for geochemical signatures. No dating of the cores has been done but Cesium137, Lead210, and radiocarbon dating could be applied to this material. Features that are interpreted as debris fl ows entering Mara Lake are thin layers of woody debris and sediment with coarser than average grain size. Magnetic susceptibility shows discrete ﾓeventsﾔ in several of the cores. Lake sediment sampling for effects of natural disturbance and forest development on fan deltas show promise for deciphering historical changes in sediment input. These sedimentation events may be related to seasonal fl ooding, landslides, fi re, or forest development. geomorphology, landslide, debris flow |
| Information Type | article |
| Regional Watershed | Shuswap |
| Sub-watershed if known | Hummingbird Creek |
| Aquifer # | |
| Comments | |
| Project status | complete |
| Contact Name | Ted Fuller |
| Contact Email | [email protected] |