THE CHINOOK WIND EAST OF THE CANADIAN ROCKIES

1941 ◽  
Vol 19a (4) ◽  
pp. 57-66 ◽  
Author(s):  
H. L. Osmond
Keyword(s):  
Pressure Distribution ◽  
Short Distance ◽  
Rocky Mountain ◽  
Mountain Ridge ◽  
Canadian Rockies ◽  
Southern Alberta ◽  
Salient Features

The phenomenon known as the Chinook wind, which occurs in the foothills of the Canadian Rockies, has been investigated. A number of salient features of the Chinook have been established. The most important one is that of the pressure distribution associated with a Chinook. This involves the establishment of a pressure trough between two anticyclones, one on each side of the Rocky Mountain ridge. The location of this trough relative to the ridge is extremely important. In order that a strong Chinook occur, the trough must lie in the lee of the Rockies. It has been shown also that the region of the Chinook is in southern Alberta, extending a short distance east from the mountains.

Integrated prestack depth migration of vertical seismic profile and surface seismic data from the Rocky Mountain Foothills of southern Alberta, Canada

Geophysics ◽  
2003 ◽  
Vol 68 (6) ◽  
pp. 1782-1791 ◽  
Author(s):  
M. Graziella Kirtland Grech ◽  
Don C. Lawton ◽  
Scott Cheadle
Keyword(s):  
Seismic Data ◽  
Rocky Mountain ◽  
Velocity Model ◽  
Seismic Profile ◽  
Vertical Seismic Profile ◽  
Prestack Depth Migration ◽  
Data Set ◽  
Depth Migration ◽  
Southern Alberta ◽  
Vsp Data

We have developed an anisotropic prestack depth migration code that can migrate either vertical seismic profile (VSP) or surface seismic data. We use this migration code in a new method for integrated VSP and surface seismic depth imaging. Instead of splicing the VSP image into the section derived from surface seismic data, we use the same migration algorithm and a single velocity model to migrate both data sets to a common output grid. We then scale and sum the two images to yield one integrated depth‐migrated section. After testing this method on synthetic surface seismic and VSP data, we applied it to field data from a 2D surface seismic line and a multioffset VSP from the Rocky Mountain Foothills of southern Alberta, Canada. Our results show that the resulting integrated image exhibits significant improvement over that obtained from (a) the migration of either data set alone or (b) the conventional splicing approach. The integrated image uses the broader frequency bandwidth of the VSP data to provide higher vertical resolution than the migration of the surface seismic data. The integrated image also shows enhanced structural detail, since no part of the surface seismic section is eliminated, and good event continuity through the use of a single migration–velocity model, obtained by an integrated interpretation of borehole and surface seismic data. This enhanced migrated image enabled us to perform a more robust interpretation with good well ties.

Life histories, production, and microdistribution of two caddisflies (Trichoptera) in a Rocky Mountain stream

1986 ◽  
Vol 64 (12) ◽  
pp. 2706-2716 ◽  
Author(s):  
Gael A. Ogilvie ◽  
Hugh F. Clifford
Keyword(s):  
Life Histories ◽  
Larval Instar ◽  
Rocky Mountain ◽  
Annual Production ◽  
Mountain Stream ◽  
Prepupal Stage ◽  
First Order ◽  
Fine Particulate ◽  
Southern Alberta ◽  
Two Populations

This paper reports results of a 2-year study of the caddisflies Oligophlebodes zelti (Limnephilidae) and Neothremma alicia (Uenoidae) in a first-order Rocky Mountain stream of southern Alberta. The Oligophlebodes population had a univoltine cycle: eggs were oviposited in July and August and hatched in about 20 days, and the larvae grew rapidly during the remainder of the ice-free season. Larvae overwintered in the fourth larval instar and molted to the fifth instar the following spring. Pupation occurred in June, and adults started emerging in mid-July. Annual production for the O. zelti population was 116 mg∙m−2∙year−1. The Neothremma population had a 2-year cycle. Eggs apparently hatched after freeze-up. Larvae overwintered in the second instar. Most of the population achieved the third instar by the following July and the fourth instar by August, and spent the second winter in either the fourth or fifth instar. There was about a 3-week prepupal stage the following July and then emergence in July and August. Annual production for the N. alicia population was 103 mg∙m−2∙year−1. Oligophlebodes zelti and N. alicia larvae fed mainly on fine particulate organic matter and diatoms. Both O. zelti and N. alicia larvae were found on rocks only in fast water areas, but the two populations did not inhabit the same riffles. The riffles inhabited by O. zelti were wider with lower slopes and water velocities than riffles dominated by N. alicia larvae. Correlation analysis, using several parameters, indicated that total periphyton of the rocks might be a major factor accounting for O. zelti's distribution. The microdistribution of the N. alicia population was not correlated with any food source.

Regional Jointing in Southern Alberta

1973 ◽  
Vol 10 (12) ◽  
pp. 1769-1781 ◽  
Author(s):  
Elkanah A. Babcock
Keyword(s):  
Late Cretaceous ◽  
Rocky Mountains ◽  
Sedimentary Rock ◽  
Rocky Mountain ◽  
Complex Pattern ◽  
Basic Unit ◽  
Fold Belt ◽  
Appalachian Plateau ◽  
Southern Alberta ◽  
Orthogonal Systems

Regional joints in southern Alberta form patterns that persist over an area extending from the Rocky Mountain Foothills to the Saskatchewan border. These patterns persist vertically through a section of rocks ranging in age from Late Cretaceous to Late Paleocene.The basic unit of jointing is an orthogonal system consisting of two sets of extension fractures. Two or more orthogonal systems may be present at a given locality creating a complex pattern of joints. System I predominates and has sets trending approximately 65 °and 155°, or roughly normal and parallel to the Rocky Mountains. System II joints trend approximately 5 °and 95°, but swing about 15 °clockwise in the Drumheller area. A system having sets trending 45 °and 135 °is present near Medicine Hat.System I joints roughly parallel intermediate width (32-64 km) subsurface structural undulations described by Robinson et al. (1969). System II joints trend parallel and normal to the crest of the Sweet-grass Arch. Further study is needed to determine the age and origin of jointing.Regional joints in southern Alberta show similarities with regional joints in similar structural settings on the Appalachian Plateau and on the Central Oklahoma Plains. Within these areas orthogonal systems of regional joints trend normal and parallel to the adjacent fold belt over vast areas and through great thicknesses of sedimentary rock.

Evaluation of temporal consistency of snow depth drivers of a Rocky Mountain watershed in southern Alberta

2020 ◽  
Vol 34 (25) ◽  
pp. 4996-5012
Author(s):  
Kelsey Cartwright ◽  
Chris Hopkinson ◽  
Stefan Kienzle ◽  
Stewart B. Rood
Keyword(s):  
Snow Depth ◽  
Rocky Mountain ◽  
Temporal Consistency ◽  
Mountain Watershed ◽  
Southern Alberta

scholarly journals Conditions for caribou persistence in the wolf-elk-caribou systems of the Canadian Rockies

Rangifer ◽  
2007 ◽  
Vol 27 (4) ◽  
pp. 79 ◽  
Author(s):  
Mark Hebblewhite ◽  
Jesse Whittington ◽  
Mark Bradley ◽  
Geoff Skinner ◽  
Alan Dibb ◽  
...  
Keyword(s):  
National Parks ◽  
Prey Species ◽  
Rocky Mountain ◽  
Future Research ◽  
Population Estimates ◽  
Canadian Rockies ◽  
Wolf Predation ◽  
Inverse Density Dependence ◽  
Kill Rate ◽  
Numeric Response

Woodland caribou populations are considered threatened in Alberta and have declined in the Canadian Rocky Mountain National Parks of Banff and Jasper despite protection from factors causing caribou populations to decline outside of parks. Recent research emphasizes the importance of the numeric response of wolves to moose in moose-caribou-wolf systems to caribou persistence. Moose are rare in the Canadian Rockies, where the dominant ungulate prey for wolves is elk. Few studies have explored wolf-elk dynamics and none have examined implications for caribou. We used data collected in Banff to estimate the numeric response of wolves to elk from 1985 to 2005. Because no caribou kill-rate data exist for the Rockies, we explore the consequences of a range of hypothetical kill-rates based on kill-rates of alternate prey collected from 1985 to 2000 in Banff. We then multiplied the numeric response of wolves by the estimated caribou kill-rates to estimate the wolf predation response on caribou as a function of elk density. Caribou predation rates were inversely density dependent because wolf numbers depend on prey species besides caribou in multiple prey species systems. We then combined this simple wolf-elk-caribou model with observed demographic and population estimates for Banff and Jasper caribou from 2003-2004 and solved for the critical kill-rate thresholds above which caribou populations would decline. Using these critical kill-rate thresholds, Jasper caribou are likely to persist when wolf densities are below 2.1 - 4.3 wolves/1000km2 and/or when elk densities are below 0.015- 0.033 elk/km2. Thresholds for Banff caribou persistence are much lower because of inverse density dependence. Future research is needed on some of the necessary assumptions underlying our modeling including multi-prey wolf numeric responses, wolf kill-rates of caribou, caribou mortality by other predators, and spatial aspects of wolf-elk-caribou dynamics.

scholarly journals Nuptse & Lhotse Go to the Rockies by J. Asnong

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Lauren Wheeler
Keyword(s):  
Visual Experience ◽  
Reading Aloud ◽  
Rocky Mountain ◽  
Grizzly Bear ◽  
Canadian Rockies ◽  
Young Readers ◽  
Entry Points ◽  
Simple Language ◽  
Canadian Pacific Railway ◽  
Mountain Geography

Asnong, Jocey. Nuptse & Lhotse Go to the Rockies. Victoria, BC: Rocky Mountain Books, 2014. Print.Nuptse & Lhotse are sibling cats with a sense of adventure.  Finding inspiration in the Canadian Rockies, author and illustrator Jocey Asnong sends the cats on an adventure through the Canadian Rockies to help Mrs. Jasper find her missing cubs, Yoho and Kootenay.  The cats along with Mrs. Jasper travel through the scenic highlights of Mountain Parks, from the Valley of the Ten Peaks to Lake Louise, along the Canadian Pacific Railway tracks to the Spiral Tunnels and up to the Columbia Icefields, with a stop to ski along the way.The story is straightforward, with simple language that works for beginner readers or reading aloud. A map at the beginning situates the events of the story, a comparison of a teddy bear to a grizzly bear is lighthearted and informative, and a maze illustration works with the plot of finding the lost cubs and is a fun activity while reading. It is the illustrations that bring the story to life by combining pencil crayon drawings with collage to create a layered visual experience leaving something new to be discovered with each read. Seamlessly incorporated into the text and illustrations are aspects of mountain geography and culture.  This includes an explanation of the blue-green colour of the mountain lakes that is part of the cats’ stop in Lake Louise and homage to legendary mountain photographer Byron Harmon. These details make good entry points for further classroom learning and connect to a number of curriculum areas.The publisher, Rocky Mountain Books, is known for publications that celebrate mountain culture and Nuptse & Lhotse Go to the Rockies is an excellent addition to their growing catalogue for young readers. Highly recommended: 4 out of 4 starsReviewer: Lauren WheelerLauren Wheeler is a Program Lead at the Alberta Museums Association. When not assisting museums across Alberta, Lauren likes to explore and relax in her hometown of Canmore.

scholarly journals Canada’s Rocky Mountain Forests Are on the Move

Eos ◽  
2020 ◽  
Vol 101 ◽  
Author(s):  
Mara Johnson-Groh
Keyword(s):  
Rocky Mountain ◽  
Mountain Forests ◽  
Canadian Rockies

Using century-old surveying photos, scientists have mapped 100 years of change in the Canadian Rockies to document the climate-altered landscape.

EXPLORATION IN THE CANADIAN ROCKIES AND FOOTHILLS

1966 ◽  
Vol 3 (5) ◽  
pp. 713-723 ◽  
Author(s):  
L. F. Keating
Keyword(s):  
Oil And Gas ◽  
Rocky Mountain ◽  
Surface Mapping ◽  
Canadian Rockies ◽  
Reflection And Refraction ◽  
Basement Rocks ◽  
Refraction Seismic ◽  
Complex Structural ◽  
Central Montana ◽  
Main Deformation

The Canadian Rockies form the most easterly ranges of the Cordilleran system for a distance of more than 1 050 miles, from the Yukon border south into central Montana. They are bounded on the east by the Interior Plains and to the west by the Rocky Mountain Trench. The main deformation occurred during the Eocene, resulting in a system of stacked thrust plates which are restricted to the sedimentary section and do not involve the crystalline basement rocks. More than 100 miles of shortening in the sediments occurred as a result of this deformation.Exploration in this structural belt has resulted in an important oil- and gas- producing province, with the major reserves located in the southern Foothills. The vast amount of information that has been accumulated in the course of this exploration through surface mapping, drilling, and geophysical work has provided excellent structural detail over a large part of the area.Prospective structures are difficult to locate, and they require careful integration of all available geological and geophysical control. Reflection and refraction seismic methods have had considerable success in locating many of the presently producing fields and have provided information that is fundamental to our understanding of this complex structural belt.

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