Contributions of streamflow variability, concentration-discharge shifts and forested wetlands to terrestrial-aquatic solute export in Precambrian Shield headwater catchments

Ecohydrology ◽  
2011 ◽  
Vol 5 (5) ◽  
pp. 596-612 ◽  
Author(s):  
Murray C. Richardson
Keyword(s):  
Forested Wetlands ◽  
Headwater Catchments ◽  
Precambrian Shield ◽  
Streamflow Variability

Wetlands and low‐gradient topography are associated with longer hydrologic transit times in Precambrian Shield headwater catchments

2019 ◽  
Vol 34 (3) ◽  
pp. 598-614 ◽  
Author(s):  
Daniel Lane ◽  
Colin P.R. McCarter ◽  
Murray Richardson ◽  
Chris McConnell ◽  
Tim Field ◽  
...  
Keyword(s):  
Headwater Catchments ◽  
Precambrian Shield ◽  
Transit Times

Chemical and Biological Changes in Nelson Lake, Ontario Following Experimental Elevation of Lake pH

1977 ◽  
Vol 12 (1) ◽  
pp. 213-232 ◽  
Author(s):  
N.D. Yan ◽  
W.A. Scheider ◽  
P.J. Dillon
Keyword(s):  
Heavy Metal ◽  
Lake Ontario ◽  
Background Concentrations ◽  
Precambrian Shield ◽  
Metal Levels ◽  
Zooplankton Communities ◽  
Shield Lakes

Abstract Intensive studies of Nelson Lake, a Sudbury area lake of intermediate pH ~5.7), were begun in 1975. The chemistry of the lake was typical of that of most PreCambrian Shield lakes except that low alkalinities and high sulphate concentrations were observed along with elevated heavy metal levels. After raising the pH of Nelson Lake to 6.4 by addition of Ca(OH)2 and CaCO3, the metals were reduced to background concentrations. Phytoplankton and Zooplankton communities, which at pH of 5.7 were typical of PreCambrian lakes, were not affected by the experimental elevation of lake pH.

EVALUATING THE NATURAL TRANSPORT PATHWAYS OF IODINE IN HEADWATER CATCHMENTS

2017 ◽  
Author(s):  
Kristina M. Gutchess ◽  
◽  
Shannon Garvin ◽  
Li Jin ◽  
Wanyi Lu ◽  
...  
Keyword(s):  
Transport Pathways ◽  
Headwater Catchments

THE NEORCHEAN RECORD OF THE CANADIAN PRECAMBRIAN SHIELD: NEW PERSPECTIVES FROM THE CRUST AND LITHOSPHERE

2020 ◽  
Author(s):  
Sally Pehrsson ◽  
◽  
John Percival ◽  
Bruce Eglington ◽  
Robert Berman ◽  
...  
Keyword(s):  
Precambrian Shield

scholarly journals Environmental Flow Assessment Considering Inter- and Intra-Annual Streamflow Variability under the Context of Non-Stationarity

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1737 ◽  
Author(s):  
Kang Ren ◽  
Shengzhi Huang ◽  
Qiang Huang ◽  
Hao Wang ◽  
Guoyong Leng
Keyword(s):  
Kendall Test ◽  
Environmental Flow ◽  
Mean Value ◽  
Test Method ◽  
Stationary Condition ◽  
Annual Streamflow ◽  
Riverine Ecosystems ◽  
Study Results ◽  
Wide Range ◽  
Streamflow Variability

A key challenge to environmental flow assessment in many rivers is to evaluate how much of the discharge flow should be retained in the river in order to maintain the integrity and valued features of riverine ecosystems. With the increasing impact of climate change and human activities on riverine ecosystems, the natural flow regime paradigm in many rivers has become non-stationary conditions, which is a new challenge to the assessment of environmental flow. This study presents a useful framework to (1) detect change points in runoff time series using two statistical methods (Mann-Kendall test method and heuristic segmentation method), (2) adjust data of the changed period against the original flow series into a stationary condition using a procedure of reconstruction; and (3) incorporate inter- and intra-annual streamflow variability with adjusted streamflow to evaluate environmental flow. The Jialing to Han inter-basin water transfer project was selected as the case study. Results indicate that a change point of 1994 was identified, revealing that the stationarity of annual streamflow series is invalid. The variations of reconstructed streamflow series are roughly consistent with original streamflow series, especially in the maximum/minimum values and rise/fall rates, but the mean value of reconstructed streamflow series is increased. The reconstructed streamflow series would further serve to eliminate the non-stationary of original streamflow, and incorporating the inter- and intra-annual variability would upgrade the ecosystem fitness. Selecting different criteria for the conservation of riverine ecosystems can have significantly different consequences, and we should not focus on the protection of specific objectives that will inevitably affect other aspects. This study provides a useful framework for environmental flow assessment and can be applied to a wide range of instream flow management approaches to protect the riverine ecosystem.

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