Burgess, Ryan Oliver - Characterizing Recharge to Fractured Bedrock in a Temperate Climate...

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This thesis has been submitted to the Library for purposes of graduation, but needs to be audited for technical details related to publication in order to be approved for inclusion in the Library collection.
Summer 2017
Degree type: 
Department of Earth Sciences
Senior supervisor: 
Diana Allen
Thesis title: 
Characterizing Recharge to Fractured Bedrock in a Temperate Climate
Given Names: 
Ryan Oliver
Fractured bedrock aquifers can have large seasonal water table fluctuations due to their low storage capacity. This study uses a land surface – subsurface model, MIKE SHE, to investigate the spatial and seasonal rainfall-runoff-recharge dynamics on Gabriola Island, in a temperate region of British Columbia, Canada. The model results suggest that recharge averages 20% of the annual precipitation, occurring dominantly over 70% of the island, typically at higher elevation. Perennial seepage areas are simulated over 4% of the island, and are generally confined to breaks in slope in low topography areas. The high water table in late fall to early spring causes both seepage and saturated overland flow to contribute to more runoff. Increases in precipitation due to climate change leads to increased runoff (+36% to +40%) and recharge (+8% to +10%) relative to today. Recharge changes are most significant in winter (+13% to +16%), compared to summer (-3% to -4%).
MIKE SHE; groundwater recharge, fractured rock, integrated model, temperate climate, climate change
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