Gully recharge rates and debris flows: A combined numerical modeling and field-based investigation, Haida Gwaii, British Columbia

Geomorphology ◽  
2017 ◽  
Vol 278 ◽  
pp. 252-268 ◽  
Author(s):  
Yvonne E. Martin ◽  
E.A. Johnson ◽  
Olga Chaikina
Keyword(s):  
British Columbia ◽  
Numerical Modeling ◽  
Debris Flows ◽  
Haida Gwaii ◽  
Recharge Rates

Observations and Numerical Modeling of the 2012 Haida Gwaii Tsunami off the Coast of British Columbia

2014 ◽  
Vol 172 (3-4) ◽  
pp. 699-718 ◽  
Author(s):  
Isaac V. Fine ◽  
Josef Y. Cherniawsky ◽  
Richard E. Thomson ◽  
Alexander B. Rabinovich ◽  
Maxim V. Krassovski
Keyword(s):  
British Columbia ◽  
Numerical Modeling ◽  
Haida Gwaii

Antiproliferative, Immunostimulatory, and Anti-Inflammatory Activities of Extracts Derived from Mushrooms Collected in Haida Gwaii, British Columbia (Canada)

2019 ◽  
Vol 21 (7) ◽  
pp. 629-643 ◽  
Author(s):  
Gurbind S. Deo ◽  
Jatinder Khatra ◽  
Sukhpreet Buttar ◽  
Wai Ming Li ◽  
Linda E. Tackaberry ◽  
...  
Keyword(s):  
British Columbia ◽  
Haida Gwaii ◽  
Anti Inflammatory

U-PB DETRITAL ZIRCON ANALYSIS OF THE QUEEN CHARLOTTE GROUP, HAIDA GWAII, BRITISH COLUMBIA

2017 ◽  
Author(s):  
Cameron Dorsey ◽  
◽  
William A. Matthews ◽  
Bernard Guest ◽  
Stephen M. Hubbard
Keyword(s):  
British Columbia ◽  
Detrital Zircon ◽  
Haida Gwaii

Collector’s Note: Amethyst from Haida Gwaii, British Columbia, Canada

2021 ◽  
Vol 96 (5) ◽  
pp. 460-463
Author(s):  
Mark Mauthner ◽  
Jack Whittles
Keyword(s):  
British Columbia ◽  
Haida Gwaii

Loon abundance and behaviour over four decades at a remote ecological reserve on Haida Gwaii, British Columbia, Canada

2021 ◽  
Vol 135 (1) ◽  
pp. 28-38
Author(s):  
Thomas Reimchen ◽  
Sheila Douglas
Keyword(s):  
British Columbia ◽  
Gasterosteus Aculeatus ◽  
Evolutionary Ecology ◽  
Inverse Correlation ◽  
Gavia Immer ◽  
Haida Gwaii ◽  
Average Wind Speed ◽  
The North ◽  
Common Loons ◽  
Ecological Reserve

Early studies (1976–1982) of the Drizzle Lake Ecological Reserve on Haida Gwaii, British Columbia focussed on the endemic Giant Threespine Stickleback (Gasterosteus aculeatus) and their predators. These surveys showed daily visits to the small lake (110 ha) by up to 59 adult non-breeding Common Loon (Gavia immer), an important stickleback predator and up to 19 breeding and non-breeding adult Red-throated Loon (Gavia stellata), which leave daily to forage in nearby marine waters. We continued loon surveys for 17 additional years (1983–1989, 2011–2020) and found that aggregations of non-breeding Common Loons occurred annually on the lake during July with maximum daily numbers of 78–83 individuals in 1987, 2018, and 2020 and a large increase from 2011 to 2020. We did not detect any relationship of these differences with the Pacific Decadal Oscillation but a significant inverse correlation with average wind speed. Average yearly numbers of Red-throated Loons declined by 50% from 1976 to 1989 and have remained low, with lowest numbers (<2) occurring in 2017. Two Red-throated Loon nesting territories on the lake were occupied from 1976 to 1995, with chicks occurring in 24 of 36 nests, but no successful nesting was observed on the lake over the last decade. The relative decline of Red-throated Loon in this reserve is similar to that reported in Arctic and Subarctic surveys of the species in the north Pacific and northern Europe. We discuss the implications for the evolutionary ecology of the sticklebacks and the conservation of the ecological reserve.

Numerical modeling of post-earthquake debris flows

2014 ◽  
pp. 1811-1815
Author(s):  
Z Dai ◽  
Y Huang ◽  
H Cheng ◽  
Q Xu ◽  
K Sawada ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Debris Flows

scholarly journals Investigation of the Effects of Surrounding Media on the Distributed Acoustic Sensing of Helically-Wound Fiber-Optic Cable with Application to the New Afton Deposit, British Columbia

2020 ◽  
Author(s):  
Sepidehalsadat Hendi ◽  
Mostafa Gorjian ◽  
Gilles Bellefleur ◽  
Christopher D. Hawkes ◽  
Don White
Keyword(s):  
British Columbia ◽  
Numerical Modeling ◽  
Analytical Model ◽  
Field Data ◽  
Fiber Optic ◽  
Incident Angle ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing ◽  
Straight Fiber

Abstract. Fiber optic sensing technology has recently become popular for oil and gas, mining, geotechnical engineering, and hydrogeology applications. With a successful track record in many applications, distributed acoustic sensing using straight fiber optic cables has become a method of choice for seismic studies. However, distributed acoustic sensing using straight fiber optic cables is not able to detect off-axial strain, hence a helically wound cable design was introduced to overcome this limitation. The helically wound cable field data in New Afton deposit showed that the quality of the data is tightly dependent on the incident angle (the angle between the ray and normal vector of the surface) and surrounding media. We introduce a new analytical two-dimensional approach to determine the dynamic strain of a helically wound cable in terms of incident angle in response to elastic plane waves propagating through multilayered media. The method can be used to quickly and efficiently assess the effects of various materials surrounding a helically wound cable. Results from the proposed analytical model are compared with results from numerical modeling obtained with COMSOL Multiphysics, for scenarios corresponding to a real installation of helically wound cable deployed underground at the New Afton mine in British Columbia, Canada. Results from the analytical model are consistent with numerical modeling results. Our modeling results demonstrate the effects of cement quality, and casing installment on the quality of the helically-wound cable response. Numerical modeling results and field data suggest that, even if reasonably effective coupling achieved, the soft nature of the rocks in these intervals would result in low fiber strains for the HWC. The proposed numerical modeling workflow would be applied for more complicated scenarios (e.g., non-linear material constitutive behaviour, and the effects of pore fluids). The results of this paper can be used as a guideline for analyzing the effect of surrounding media and incident angle on the response of helically wound cable, optimizing the installation of helically wound cable in various conditions, and to validate boundary conditions of 3-D numerical model built for analyzing complex scenarios.

Late Pleistocene age, size, and paleoenvironment of a caribou antler from Haida Gwaii, British Columbia

2019 ◽  
Vol 56 (6) ◽  
pp. 688-692 ◽  
Author(s):  
Rolf W. Mathewes ◽  
Michael Richards ◽  
Thomas E. Reimchen
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Vegetation Cover ◽  
Coniferous Forest ◽  
Bone Collagen ◽  
Haida Gwaii ◽  
Terrestrial Vertebrates ◽  
Mis 3 ◽  
Basal Portion ◽  
Marine Isotope Stage 3

The basal portion of a fossil caribou antler from Graham Island is the only evidence of large terrestrial vertebrates older than the Fraser (late-Wisconsin) glaciation on Haida Gwaii. This antler has been radiocarbon dated three times by different laboratories and all ages fall within the mid-Wisconsin Olympia Interglaciation (Marine Isotope Stage 3, MIS 3). We suggest that the latest date, using ultrafiltration of bone collagen, is closest to the true age at 43 200 ± 650 years BP (48 200 – 45 200 cal BP). Previous paleoecological analysis from Graham Island reconstructed a vegetation cover during MIS 3 consisting of mixed coniferous forest with nonforested openings, similar to cool subalpine forests of today. These conditions are consistent with environments that support woodland caribou and the related extinct Dawson caribou. Morphometric comparison of antlers from woodland and Dawson caribou suggest that they are more similar than previously interpreted and raise questions about the inferred differences between the mainland and island subspecies.

scholarly journals Numerical modeling of the debris flows runout

2017 ◽  
Vol 140 ◽  
pp. 03002 ◽  
Author(s):  
Francesco Federico ◽  
Chiara Cesali
Keyword(s):  
Numerical Modeling ◽  
Debris Flows
Sign in / Sign up

Export Citation Format

Share Document