Understanding the Thermal Regime of Rivers Influenced by Small and Medium Size Dams in Eastern Canada

2016 ◽  
Vol 32 (10) ◽  
pp. 2032-2044 ◽  
Author(s):  
A. Maheu ◽  
A. St-Hilaire ◽  
D. Caissie ◽  
N. El-Jabi
2016 ◽  
Vol 73 (12) ◽  
pp. 1885-1897 ◽  
Author(s):  
Audrey Maheu ◽  
André St-Hilaire ◽  
Daniel Caissie ◽  
Nassir El-Jabi ◽  
Guillaume Bourque ◽  
...  

Various studies have helped gain a better understanding of the thermal impacts of dams on a site-specific basis, but very few studies have compared the thermal impacts of varying types of dams within the same region. In this study, we conducted a regional-scale assessment of the impacts of dams on the thermal regime of 13 medium-size rivers in eastern Canada. The objectives of this study were to identify features of the thermal regime of rivers that are predominantly impacted by dams and to compare the impacts associated with different types of regulation (run-of-river, storage, peaking). The thermal regime of regulated and unregulated rivers was characterized using 15 metrics that described the magnitude, frequency, duration, timing, and rate of change of water temperature. Results indicate that storage and peaking dams impounding at least 10% of the median annual runoff generally (i) reduced the magnitude of water temperature variation at seasonal, daily, and subdaily timescales and (ii) increased the monthly mean water temperature in September. This regional assessment offers important insight regarding a generalized pattern of thermal alteration by dams, and this information could be used to guide biological monitoring efforts in regulated rivers.


1991 ◽  
Vol 194 (4) ◽  
pp. 357-361 ◽  
Author(s):  
Antonio Correia ◽  
F. Walter Jones

2008 ◽  
Vol 2008 (1) ◽  
pp. 453-457
Author(s):  
Alain Lamarche ◽  
Pierre Samson

ABSTRACT The effectiveness of spill response organizations to handle incidents much depends on the use of well trained personnel and specialized equipment. Knowing where equipment is located, and ensuring that it is ready to use and in good working order are both vital to the planning and management of a response. It is with these goals and concerns that the Eastern Canada Response Corporation (ECRC) recently decided to update its computerized equipment inventory and maintenance system. An analysis showed that commercially equipment maintenance support systems were not well adapted to the general maintenance processes and tasks used within the organization, were too complex and were not flexible enough. For this reason, an entirely new system was created to support the management of equipment maintenance. The system was developed using Microsoft Access, with a file server architecture allowing many users to access each of 6 regionally maintained equipment databases. A simple internet based mechanism was developed to enable merging of each of the database for consultation for inventory purposes. Some of the functions included:– Support for the planning of each of 4 types of maintenance, including preventive, license renewal, safety inspections and enhancements or repairs;– A simple mechanism allowing the user to indicate that a piece of equipment is located within another piece of equipment.– The capacity to associate lists of accessories to pieces of equipment– Storage and retrieval of predefined maintenance processes description Support was also provided to the planning of equipment repair or enhancements through the production of itemized and dated tasks lists. Some other additional features included: the management of equipment names, to prevent proliferation of names for essentially similar pieces of equipment; the inclusion of a “query-by-example” mechanism for equipment search; and the capacity to export any or all data to a spreadsheet, in order to enable flexible analysis and planning. The system was also designed in a way to make it easy to upgrade to a database server architecture, should the need arise. The approach used for the system development and implementation would be applicable to any small to medium size response organization.


1993 ◽  
Vol 23 (3) ◽  
pp. 18-35
Author(s):  
Ian M. Gomme ◽  
Mary P. Hall ◽  
Terry J. Murphy

This paper reports the initial findings of a survey (N=388) conducted in Winter 1991 focusing on the quality of the academic experience for Arts and Science students at a medium size post-secondary institution in eastern Canada. Our purposes are: 1) to set out the context in which undergraduates conduct their academic work, 2) to document what their experience entails, and 3) to present some of their perceptions of the higher education process. While most students have vocational goals in mind, they are also keenly interested in acquiring a solid general education. Undergraduates attend most of their classes, are heavily committed to completing their programs, and work quite diligently in pursuit of their goals in the face of what many of them consider to be heavy workloads. They are not, however, completely satisfied with the services that they receive in return for their tuition fees and for Canadians' tax dollars. While satisfaction levels vary with the type of services provided, it is clear that there does exist substantial room in which institutions can make improvements. Specifically, our data suggest that the primary goals of universities seeking to better the undergraduate experience should be to encourage more effective teaching and its evaluation, to reduce class sizes, to increase formal and informal interaction among faculty members and students, to improve the quality of academic advising, and to support the creation of more equitable financial assistance programs for students.


2000 ◽  
Author(s):  
N. Esmen ◽  
T. Hall ◽  
D. Johnson ◽  
R. Lynch ◽  
M. Phillips ◽  
...  

2020 ◽  
Vol 643 ◽  
pp. 197-217 ◽  
Author(s):  
SME Fortune ◽  
SH Ferguson ◽  
AW Trites ◽  
B LeBlanc ◽  
V LeMay ◽  
...  

Climate change may affect the foraging success of bowhead whales Balaena mysticetus by altering the diversity and abundance of zooplankton species available as food. However, assessing climate-induced impacts first requires documenting feeding conditions under current environmental conditions. We collected seasonal movement and dive-behaviour data from 25 Eastern Canada-West Greenland bowheads instrumented with time-depth telemetry tags and used state-space models to examine whale movements and dive behaviours. Zooplankton samples were also collected in Cumberland Sound (CS) to determine species composition and biomass. We found that CS was used seasonally by 14 of the 25 tagged whales. Area-restricted movement was the dominant behaviour in CS, suggesting that the tagged whales allocated considerable time to feeding. Prey sampling data suggested that bowheads were exploiting energy-rich Arctic copepods such as Calanus glacialis and C. hyperboreus during summer. Dive behaviour changed seasonally in CS. Most notably, probable feeding dives were substantially shallower during spring and summer compared to fall and winter. These seasonal changes in dive depths likely reflect changes in the vertical distribution of calanoid copepods, which are known to suspend development and overwinter at depth during fall and winter when availability of their phytoplankton prey is presumed to be lower. Overall, CS appears to be an important year-round foraging habitat for bowheads, but is particularly important during the late summer and fall. Whether CS will remain a reliable feeding area for bowhead whales under climate change is not yet known.


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