Darren B. Sjogren

• University of Calgary

Planimetric change was measured on daily hydrographs over two meltwater seasons using time‐lapse images of the proglacial, gravel, braided, Sunwapta River, Canada. Significant planimetric change occurred on 10–15 days per year. Area of planimetric change correlated with peak and total daily meltwater hydrograph discharge. A clear threshold discharg...

Remote sensing applied to river monitoring adds complementary information useful for understanding the system behaviour. In this paper, we present a method for visual stage gauging and water surface width measurement using a ground-based time-lapse camera and a fully automatic image analysis algorithm for flow monitoring at a river cross section of...

Remote sensing applied to river monitoring adds complementary information useful to understand the system behavior. In this paper we present a visual stage gauging and width measurement method using a ground-based time-lapse camera and a fully automatic image analysis algorithm for flow monitoring at a river cross-section of a steep bouldery channe...

A devastating flood occurred in southern Alberta on June 19, 2013, from greater than normal snowfalls in the Rocky Mountains and excess precipitation during the early spring that left soils saturated and unable to absorb any additional precipitation. This flood was Canada's most costly natural disaster, with five to six billion Canadian dollars in...

Meltwater is an important part of the glacier system as it can directly influence ice sheet dynamics. Although it is important that ice sheet models incorporate accurate information about subglacial meltwater processes, the relative inaccessibility of contemporary ice sheet beds makes direct investigation challenging. Former ice sheet beds contain...

Prior studies have shown that the morphology of glacial valleys demonstrates a significant degree of regularity in cross-section form, although no such analysis has been undertaken for the Canadian Rockies. Our study area, located in Kananaskis, Alberta, Canada, covers approximately 150 km2 and is characterized by high mountain relief, with elevati...

Eskers are the casts of ice-walled tunnels and are a common landform within the footprint of the last Laurentide Ice Sheet (LIS). Over crystalline bedrock eskers are relatively long and ubiquitous; they are shorter and less common over sedimentary bedrock. Assuming that glaciers overriding sedimentary bedrock necessarily produce deforming beds, thi...

Spatially discontinuous meltwater channel networks on the Canadian Prairies are usually interpreted as having formed subaerially in front of the retreating Laurentide ice sheet. Evidence in the Coronation–Spondin scabland, east-central Alberta, supports an alternative formation by progressive channelization of a subglacial sheetflow of water. The s...

Gimbarzevsky (1988) collected an exceptional landsliding inventory for Haida Gwaii, British Columbia that included over 8,000 landsliding vectors covering an area of approximately 10,000 km2. This database was never published in the referred literature, despite its regional significance. It was collected prior to widespread application of GIS techn...

Gimbarzevsky (1988) collected an exceptional landsliding inventory for the Haida Gwaii, British Columbia (formerly called the Queen Charlotte Islands). This data base includes more than 8 000 landsliding vectors, with an areal coverage of about 10 000 km2. Unfortunately, this landsliding inventory was never published in the referred literature, des...

Subglacial landforms across various scales preserve the history of movement, deposition and erosion by the last great ice sheets and their meltwater. The origin of many of these landforms is, however, contentious. In this chapter these forms are described both individually and as suites that make up entire landscapes. Their interpretations are disc...

Micromorphology has recently been applied more in analyzing glacial sediments at a microscopic level. It provides additional information and details that may help to explain glacial processes in areas where macro- scale observations cannot yield sufficient information. However, the process of interpreting thin sections has been very subjective, and...

hummocks;deposition;glaciation;recessional moraines;meltwater erosion

Glaciers are powerful agents of erosion that can broaden and deepen valley floors, steepen valley sides and enhance local relief. The objective of this research is to analyze downvalley patterns in valley cross-section profiles in the Canadian Rocky Mountains to infer information about controls on glacial valley genesis. This study focuses on the B...

The ability to characterize the geometry and lithology of Quaternary sediments is important to scientists who investigate groundwater movement, geoarchaeology, materials prospecting ( e. g., gravel), environmental contamination and remediation, and paleoenvironmental studies. Often these studies are restricted by the limited information attainable...

Recent research has identified differences in processes contributing to suspended sediment concentration (SSC) dynamics in proglacial streams between High Arctic and alpine catchments, but does not examine processes explicitly linked to the periglacial environment. Three glacierized basins were studied: Austre Brøggerbreen and Midre Lovénbreen, Sva...

In high latitudes, recent research has demonstrated that both thermo-erosion and temperature dependence influence sediment release into fluvial systems. An analysis of proglacial suspended sediment concentration (SSC) dynamics is presented for three glacierized basins: cold-based Austre Brøggerbreen (Svalbard), polythermal Midre Lovénbreen (Svalbar...

Two exceptional mass wasting inventories (Rood, 1984; Gimbarzevsky, 1988) have been collected and analyzed for the Queen Charlotte Islands, British Columbia. These islands are located about 80 km off the coast of British Columbia, have a mild, wet climate and are seismically active. These factors contribute to a high frequency of landsliding. The G...

At some time close to the Last Glacial Maximum (LGM) high-energy, subglacial, Laurentide, meltwater flows eroded a series of discontinuous tunnel channels into the northeastern flanks of the Porcupine Hills and adjacent parts of the high plains near Nanton, Stavely and Claresholm. Discrete channel segments, kilometers long, up to about 1km wide, an...

Glaciated terrains in east-central Alberta and south-central Michigan contain channels that have hummocks and transverse ridges separating depressions along their floors. This association imparts a linked pothole appearance. Similar channels are often interpreted as tunnel channels or subaerial channels, partly filled with sediment from a subsequen...

The landscape in Alberta, Canada, is dominated by a single province-wide landscape unconformity. This unconformity is marked by erosional fluted and hummocky terrain, which cuts into all local bedrock and sediment. Sedimentology, geomorphology and topography all indicate erosion by enormous volumes of water that flowed under the Laurentide Ice Shee...

Submitted to the Faculty of Graduate Studies and Research in partial fulfilment of the requirements for the degree of Master of Science, Department of Earth and Atmospheric Sciences. Thesis (M.Sc.)--University of Alberta, 1999.

Evidence of late Wisconsin subglacial megafloods includes fields of giant flutings, drumlins, tunnel channels, and scoured bedrock tracts. Scoured tracts are marked by channeled scabland, water-eroded depressions (s forms), and postglacial development of solonetzic (saline clay pan) soils on Cretaceous bedrock. Belts of hummocky terrain and small z...

The northern prairie region of North America is characterized by undulating terrains with very low regional gradient, underlain by clay-rich glacial tills. The soils derived from clay-rich tills have very low permeability when they are frozen. As a result a large amount of snowmelt runoff is generated over frozen ground. Numerous depressions on the...

The large inventory of mass wasting data collected by Gimbarzevsky (1988) for the Queen Charlotte Islands, British Columbia is an exceptional data base. The archipelago is located approximately 80 km off the coast of British Columbia and is seismically active, having the potential for earthquakes of large magnitude. The climate is mild, wet (1300 t...