Bed-material transport rate derived from delta progradation in a small alpine basin, Fitzsimmons Creek, coast mountains, British Columbia

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2001
Authors/Contributors
Abstract
A sediment budget was determined for Fitzsimmons Creek in order to assess the long-term bed-material efflux from a high-energy, debris-flow dominated alpine stream in the Coast Mountains of British Columbia. The primary component of the thesis (Part1) examines the long-term bed-material transport rate from morphologic data, sonar bathymetry, and ground-penetrating radar surveys of the fan-delta built by Fitzsimmons Creek and recorded on sequential aerial photography for the period 1947-1999. The average annual bed-material transport rate is 1.60 ± 0.28 104 Mg yr-1 for the 52-year period, with a range of 2.20 x 104 Mg yr1 for decadal estimates. Considerable temporal variability of the average bed-material efflux is evident over the 52-year record. The length of time required to measure a stable average annual bed-material transport rate in this particular system appears to be not less than 50 years. A secondary component of the thesis (Part 2) examines the total sediment budget based on direct measurements of bed-material accumulated in the fan-delta and estimates of suspended-sediment over the 52-year period. The long-term minimum specific sediment yield is 0.57 ± 0.14 Mg km-2 day-1 based on direct measurements and the estimate of the specific sediment yield for this system is 0. 90 ± 0 .48 Mg km- 2 day-1. A significant proportion of the total sediment load (averaging 49% over the 52-years) is deposited as bed-material in Fitzsimmons Creek's fan-delta.
Document
Copyright statement
Copyright is held by the author.
Permissions
The author granted permission for the file to be printed and for the text to be copied and pasted.
Scholarly level
Supervisor or Senior Supervisor
Thesis advisor: Hickin, E.J.
Language
English
Member of collection
Attachment Size
Pelpola_.pdf 7.4 MB