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Masaki Hayashi  - - - 
Top co-authors See all
Yukiyoshi Iwata

122 shared publications

NARO

Alain Pietroniro

71 shared publications

Tomoyoshi Hirota

48 shared publications

NARO Hokkaido Agricultural Research Center

Chris Holmden

33 shared publications

John J. Gibson

27 shared publications

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Publication Record
Distribution of Articles published per year 
(2004 - 2016)
Total number of journals
published in
 
12
 
Publications See all
Article 0 Reads 16 Citations Hydrology of Prairie Wetlands: Understanding the Integrated Surface-Water and Groundwater Processes Masaki Hayashi, Garth van der Kamp, Donald O. Rosenberry Published: 14 July 2016
Wetlands, doi: 10.1007/s13157-016-0797-9
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Wetland managers and policy makers need to make decisions based on a sound scientific understanding of hydrological and ecological functions of wetlands. This article presents an overview of the hydrology of prairie wetlands intended for managers, policy makers, and researchers new to this field (e.g., graduate students), and a quantitative conceptual framework for understanding the hydrological functions of prairie wetlands and their responses to changes in climate and land use. The existence of prairie wetlands in the semi-arid environment of the Prairie-Pothole Region (PPR) depends on the lateral inputs of runoff water from their catchments because mean annual potential evaporation exceeds precipitation in the PPR. Therefore, it is critically important to consider wetlands and catchments as highly integrated hydrological units. The water balance of individual wetlands is strongly influenced by runoff from the catchment and the exchange of groundwater between the central pond and its moist margin. Land-use practices in the catchment have a sensitive effect on runoff and hence the water balance. Surface and subsurface storage and connectivity among individual wetlands controls the diversity of pond permanence within a wetland complex, resulting in a variety of eco-hydrological functionalities necessary for maintaining the integrity of prairie-wetland ecosystems.
Article 0 Reads 0 Citations Geologically controlled bi-directional exchange of groundwater with a hypersaline lake in the Canadian prairies Echange ... Laurence R. Bentley, Masaki Hayashi, Elena P. Zimmerman, Chr... Published: 03 February 2016
Hydrogeology Journal, doi: 10.1007/s10040-016-1368-0
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Conference 0 Reads 0 Citations WATERSHED-SCALE STUDY OF GROUNDWATER RECHARGE IN THE CANADIAN PRAIRIES Masaki Hayashi, Igor Pavlovskii, Saskia L. Noorduijn, Amir N... Published: 01 January 2016
GSA Annual Meeting in Denver, Colorado, USA - 2016, doi: 10.1130/abs/2016am-283938
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Article 0 Reads 3 Citations Community-Based Groundwater Monitoring Network Using a Citizen-Science Approach Kathleen E. Little, Masaki Hayashi, Steve Liang Published: 30 March 2015
Groundwater, doi: 10.1111/gwat.12336
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Water level monitoring provides essential information about the condition of aquifers and their responses to water extraction, land‐use change, and climatic variability. It is important to have a spatially distributed, long‐term monitoring well network for sustainable groundwater resource management. Community‐based monitoring involving citizen scientists provides an approach to complement existing government‐run monitoring programs. This article demonstrates the feasibility of establishing a large‐scale water level monitoring network of private water supply wells using an example from Rocky View County (3900 km2) in Alberta, Canada. In this network, community volunteers measure the water level in their wells, and enter these data through a web‐based data portal, which allows the public to view and download these data. The close collaboration among the university researchers, county staff members, and community volunteers enabled the successful implementation and operation of the network for a 5‐year pilot period, which generated valuable data sets. The monitoring program was accompanied by education and outreach programs, in which the educational materials on groundwater were developed in collaboration with science teachers from local schools. The methodology used in this study can be easily adopted by other municipalities and watershed stewardship groups interested in groundwater monitoring. As governments are starting to rely increasingly on local municipalities and conservation authorities for watershed management and planning, community‐based groundwater monitoring provides an effective and affordable tool for sustainable water resources management.
Article 0 Reads 7 Citations Watershed-scale response of groundwater recharge to inter-annual and inter-decadal variability in precipitation (Alberta... Masaki Hayashi, Christopher R. Farrow Published: 15 August 2014
Hydrogeology Journal, doi: 10.1007/s10040-014-1176-3
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Groundwater recharge sets a constraint on aquifer water balance in the context of water management. Historical data on groundwater and other relevant hydrological processes can be used to understand the effects of climatic variability on recharge, but such data sets are rare. The climate of the Canadian prairies is characterized by large inter-annual and inter-decadal variability in precipitation, which provides opportunities to examine the response of groundwater recharge to changes in meteorological conditions. A decadal study was conducted in a small (250 km2) prairie watershed in Alberta, Canada. Relative magnitude of annual recharge, indicated by water-level rise, was significantly correlated with a combination of growing-season precipitation and snowmelt runoff, which drives depression-focussed infiltration of meltwater. Annual precipitation was greater than vapour flux at an experimental site in some years and smaller in other years. On average precipitation minus vapour flux was 10 mm y−1, which was comparable to the magnitude of watershed-scale groundwater recharge estimated from creek baseflow. Average baseflow showed a distinct shift from a low value (4 mm y−1) in 1982–1995 to a high value (15 mm y−1) in 2003–2013, indicating the sensitivity of groundwater recharge to a decadal-scale variability of meteorological conditions.
Article 0 Reads 9 Citations Geophysical imaging and thermal modeling of subsurface morphology and thaw evolution of discontinuous permafrost Alastair F. McClymont, Masaki Hayashi, Laurence R. Bentley, ... Published: 01 September 2013
Journal of Geophysical Research: Earth Surface, doi: 10.1002/jgrf.20114
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[1] Despite our current understanding of permafrost thaw in subarctic regions in response to rising air temperatures, little is known about the subsurface geometry and distribution of discontinuous permafrost bodies in peat‐covered, wetland‐dominated terrains and their responses to rising temperature. Using electrical resistivity tomography, ground‐penetrating radar profiling, and thermal‐conduction modeling, we show how the land cover distributions influence thawing of discontinuous permafrost at a study site in the Northwest Territories, Canada. Permafrost bodies in this region occur under forested peat plateaus and have thicknesses of 5–13 m. Our geophysical data reveal different stages of thaw resulting from disturbances within the active layer: from widening and deepening of differential thaw features under small frost‐table depressions to complete thaw of permafrost under an isolated bog. By using two‐dimensional geometric constraints derived from our geophysics profiles and meteorological data, we model seasonal and interannual changes to permafrost distribution in response to contemporary climatic conditions and changes in land cover. Modeling results show that in this environment (1) differences in land cover have a strong influence on subsurface thermal gradients such that lateral thaw dominates over vertical thaw and (2) in accordance with field observations, thaw‐induced subsidence and flooding at the lateral margins of peat plateaus represents a positive feedback that leads to enhanced warming along the margins of peat plateaus and subsequent lateral heat conduction. Based on our analysis, we suggest that subsurface energy transfer processes (and feedbacks) at scales of 1–100 m have a strong influence on overall permafrost degradation rates at much larger scales.