Tribe, Selina | DOOR - DOuglas Open Repository

Photograph

Person Preferred Name

Selina Tribe

Position

Faculty Member

Email/Contact

tribes@douglascollege.ca

Department

Earth and Environmental Sciences

Science and Technology

Status

current

Affiliation Date

2017

PhD (Simon Fraser University)
MSc (University of British Columbia)
BSc (University of British Columbia)

Douglas College Faculty Member since 2017.

Selina is a Professional Geoscientist with 25 years experience mapping rocks and landforms on Earth, and as far afield as Mars. She has consulted on numerous mineral exploration and resource development projects throughout the Americas. Selina is active in mineral exploration in British Columbia and serves on the board of Sego Resources Inc. She is the Chair of Women in Engineering and Geoscience, a division of Engineers and Geoscientists British Columbia. She has authored online technical courses, scholarly papers, maps, and articles on various aspects of earth science. She mentors junior geologists and students interested in science. Selina is a co-investigator with fellow faculty member Lisa Smith (Anthropology & Sociology) on a research project entitled, ‘Menstruate, Advocate, Repeat.’ This project examines the menstrual equity movement in Canada and explores the orientation and experience of advocates and activists. She played an important role in getting free menstrual supplies into school restrooms across British Columbia, and continues to lead the efforts on policy change around menstrual equity throughout Canada. The Menstrual Research Group will have an online archive in DOOR that seeks to highlight menstruation activism and political advocacy in Canada, in the past and present.

Related Works

Post-secondary periods: Access to menstrual supplies on campus and impacts on students

Digital Document

<p>The present study, one of the first of its kind in Canada, documents existing access to menstrual supplies at a Canadian mid-size post-secondary institution, and the impacts on students’ capacity to pursue an education. The study consists of a complete audit of all campuses and near-campus facilities in the Fall of 2019, and a survey of 370 students between March 2020 and July 2020. Study results show that existing availability on campus of disposable single-use tampons and pads is inadequate, problematic, and expensive. Dispensers do not work or cannot be found, campus stores charge high prices and overtax the items, and it is a long walk off-campus to buy from the nearest store. Study participants reported unexpected periods and menstrual spills, leaks, and stains on a frequent basis. Students report resorting to make-shift, ad hoc solutions in order to remain on campus, such as using toilet paper as a temporary pad. Some participants reported academic penalties, missing class, or leaving campus to go home due to lack of menstrual supplies. Overall, existing menstrual supplies on campus reflect outdated societal expectations for menstruation to be managed at the individual level. Poor availability of menstrual supplies on campus is a barrier to full participation in post-secondary education and campus life. Study results indicate the need for post-secondary institutions to classify menstrual products as ‘essential’ items to be included in restrooms, in line with toilet paper, hand soap, hand- drying facilities, sanitary bins, and urinals. This approach would equalize the support and convenience of restrooms for both sexes and eliminate the need for students to take money or their own supplies into the restroom. Providing support for menstruation on campus will help all people who menstruate as they pursue higher learning.</p>

Geomorphic evidence for Tertiary drainage networks in the southern Coast Mountains, British Columbia

Digital Document

Tertiary drainage networks are reconstructed by mapping drainage anomalies and valley trends on shaded-relief maps of the southern Coast Mountains (NTS 92 G, H, I, J). Geological and structural relationships provide age constraints for the valleys. In the vicinity of Gold Bridge, ancestral Bridge River and Seton River flowed northeast sometime between latest Cretaceous and Eocene time. Strike-slip faulting along the Yalakom and Fraser faults diverted the rivers to the southeast during Eocene time. Lillooet River valley crosscut and captured the headwaters of the ancestral Bridge and Seton rivers. Geomorphic evidence indicates an ancestral Fraser River did not flow south along the trace of the Fraser Fault until sometime after Eocene strike-slip faulting. A dendritic network of streams developed throughout the region in Miocene time, and incised during late Miocene-Pliocene regional uplift.

Physiography and Tertiary base levels in the southern Interior Plateau and adjacent areas, southwestern British Columbia

Digital Document

Geomorphology, valley-fill geology, and drainage anomalies indicate that a suite of early Tertiary and older valleys occurs in the study area. Eocene relief and base level of the North Thompson River valley were the same as today,1000m and400mrespectively.The valley predates the middle Eocene. TheThompson River from Kamloops to Martel follows the trend of a broad Eocene valley and is inset 125 to 350 m below the sub-Eocene unconformity. The Thompson River valley from Martel to Lytton and the Nicola, Nahatlatch, and Stein river valleys define a branching, north-flowing drainage pattern that post dates the Eocene Fraser Fault. The Nicola Lake valley is probably Paleocene to Eocene. A former drainage divide existed along the Fraser River valley between Anderson River and Hell's Gate. Base level was about 500 m higher in the Miocene than in the Eocene.

Temporal changes in the geographic distribution, elevation, and potential origin of the Martian outflow channels

Digital Document

Presented at the Lunar and Planetary Institute Workshop, November 15-17, 1993, Houston, Texas. Observational evidence of outflow channel activity on Mars suggests that water was abundant in the planet's early crust. However, with the decline in the planet's internal heat flow, a freezing front developed within the regolith that propagated downward with time and acted as a thermodynamic sink for crustal H2O. One result of this thermal evolution is that, if the initial inventory of water on Mars was small, the cryosphere may have grown to the point where all the available water was taken up as ground ice. Alternatively, if the inventory of H2O exceeds the current pore volume of the cryosphere, then Mars has always possessed extensive bodies of subpermafrost groundwater. We have investigated the relative age, geographic distribution, elevation, and geologic setting of the outflow channels in an effort to accomplish the following: (1) identify possible modes of origin and evolutionary trends in their formation; (2) gain evidence regarding the duration and spatial distribution of groundwater in the crust; and (3) better constraint estimates of the planetary inventory of H2O.

The role of aerial photograph interpretation in natural hazard and risk assessment

Digital Document

Presented at the <a href="https://event.asme.org/IPC"> International Pipeline Conference </a>, October 4–8, 2004, Calgary, Alberta, Canada. <p>Aerial photograph interpretation is an accurate and economical method of assessing terrain conditions and natural hazards affecting pipelines and other linear facilities. Completed in advance of vehicle and helicopter-based reconnaissance, it provides a comprehensive site overview that cannot be obtained at ground level. Aerial photograph interpretation helps construct and confirm preliminary hazard and stream-crossing inventories, understand hazard mechanisms, and estimate hazard volume and activity. Time series photo interpretation uses several sets of aerial photographs taken of the same area in different years to track changes in terrain, stream patterns and land-use over time. In addition, aerial photographs are superior navigation tools in the field. These points are illustrated using examples from pipelines in British Columbia and Alberta. This work will be of interest to managers of pipelines throughout western Canada, and to those involved with pipeline route selection through mountainous regions.

Simulations of cobble structure on a gravel streambed

Digital Document

We present a two‐dimensional, time independent, kinematic simulation of a gravel streambed that models impacts between clasts as elastic collisions without momentum transfer between discrete, circular disks. The prototype bed forms that we seek to simulate are the “stone cells” observed in Harris Creek, south central British Columbia. The basic algorithm causes simulated stones to cluster into longitudinal structures that resemble such gravel bed forms as imbricate clusters and cluster bed forms. A modified algorithm incorporating programming rules such as stone rotation, entrainment probability inversely proportional to stone size, and the shielding effects of neighbors causes simulated stones to cluster into structures that resemble transverse ribs. Trials incorporating the rotation rule, with or without additional rules, produce a cobble structure most similar to the prototype. Of all the parameters in the simulation, the number of stones seems to have the most control on the development of an extended surface structure.

Computer simulations of cobble structure on a gravel stream bed

Digital Document

In Harris Creek, a gravel bed river in southcentral British Columbia, the large stones protruding from the surface armour of the bed are arranged as curvilinear ridges oriented at varying angles to the flow, defining a net-like surface structure. A computer simulation, using various rules governing the entrainment and deposition of stones, was written to reproduce these structures. The working hypothesis for the simulation is that the patterns are the result of the mutual interaction of stones as they are mobilized into the flow and collide with downstream obstacles. An opposing hypothesis would be that the pattern being imposed on the stones by the flow. A statistical algorithm was developed to identify cobble ridges and their orientations and to allow a comparison between the simulation results and the real example. Simulations using different sized stones in a bed with 10% of its area covered by stones produce flow-parallel, linear clusters resembling cluster bedforms. Simulations using a more densely populated bed, up to 25% covered area, produce a variety of gravel bedforms including cluster bedforms, transverse ribs, some trending at oblique orientations, and arcuate ridges. These results indicate that the magnitude of the stone population influences the suite of bedforms that emerge. Cluster bedforms may be the result of obstacles to the downstream movement of stones in a sparsely populated bed. Furthermore, cluster bedforms may be nuclei from which oblique ridges develop out of excess sediment. Finally, simulations in which large stones are rarely entrained and travel shorter distances than small stones, produce structures very similar to those found in Harris Creek.

Cenozoic drainage history of southern British Columbia

Digital Document

The author has placed restrictions on the PDF copy of this thesis. The PDF is not printable nor copyable. If you would like the SFU Library to attempt to contact the author to get permission to print a copy, please email your request to summit-permissions@sfu.ca.

Eocene paleo-physiography and drainage directions, southern Interior Plateau, British Columbia

Digital Document

A map of reconstructed Eocene physiography and drainage directions is presented for the southern Interior Plateau region, British Columbia south of 53°N. Eocene landforms are inferred from the distribution and depositional paleoenvironment of Eocene rocks and from crosscutting relationships between regional-scale geomorphology and bedrock geology of known age. Eocene drainage directions are inferred from physiography, relief, and base level elevations of the sub-Eocene unconformity and the documented distribution, provenance, and paleocurrents of early Cenozoic fluvial sediments. The Eocene landscape of the southern Interior Plateau resembled its modern counterpart, with highlands, plains, and deeply incised drainages, except regional drainage was to the north. An anabranching valley system trending west and northwest from Quesnel and Shuswap Highlands, across the Cariboo Plateau to the Fraser River valley, contained north-flowing streams from Eocene to early Quaternary time. Other valleys dating back at least to Middle Eocene time include the North Thompson valley south of Clearwater, Thompson valley from Kamloops to Spences Bridge, the valley containing Nicola Lake, Bridge River valley, and Okanagan Lake valley. During the early Cenozoic, highlands existed where the Coast Mountains are today. Southward drainage along the modern Fraser, Chilcotin, and Thompson River valleys was established after the Late Miocene.

Just flow: laying a foundation for menstrual research

Video

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