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Identification of Critical Regions for Water Quality Monitoring with Respect to Seasonal and Annual Water Surplus

Show simple item record Fallow, David J. Brown, D. Murray Parkin, Gary W. Lauzon, John D. Wagner-Riddle, Claudia 2010-07-05T20:59:04Z 2010-07-05T20:59:04Z 2003-05-31
dc.description Application of Simultaneous Heat and Water (SHAW) model to climatic data and several soil types. en
dc.description.abstract The variability in seasonal and annual surplus water in seven regions of Ontario is estimated and analyzed in this publication. Surplus water is that water resulting from precipitation that runs off the land surface or drains through the soil profile eventually reaching the groundwater table. Surplus water as either runoff or deep drainage may carry pollutants that could lead to surface water or groundwater contamination. Knowledge of the timing, amount and form of surplus water in a given region of Ontario would assist in the prediction of when surface water and groundwater are more susceptible to contamination. For example, this information could potentially be used by farmers as related to nutrient management practices. A one-dimensional, deterministic model that simulated water flow in soil, including plant uptake, evapotranspiration, and freeze/thaw conditions was used to estimate the water surpluses. This model, referred to as the Simultaneous Heat and Water (SHAW) model, was applied to daily climate data from January 1, 1954 to December 31, 2001 for recording sites in seven climate regions: Emo, Harrow, Guelph, Kapuskasing, Mount Forest, Ottawa and Smithfield. A corn crop and the typical soil profile conditions for each region, with the hydraulic properties for the typical soil were used as inputs for the model. To differentiate between the effects of soil type and climate on the components of the water balance, a second model run for all sites using an Embro silt loam profile was performed. The seasons were divided into winter (December, January, February and March); spring (April and May); summer (June, July and August); and fall (September, October and November). There were significant differences in average annual and seasonal water surpluses among the seven regions. The variability from year to year was significant. Most of the annual surplus water occurred in the winter and spring seasons, and in some years the surplus exceeded the precipitation in the spring season. The latter would be due to winter snow accumulations lasting into the spring season before melting. Deep drainage exceeded runoff at four of the seven sites for the typical soil profile in the region and at three of the sites for an Embro soil profile. Of the three sites where runoff exceeded deep drainage for the typical soil profile, the difference was most pronounced at Kapuskasing, because of the disproportionate snow melt in the spring season. Deep drainage was relatively small at Emo and Harrow, actually becoming negative on an annual basis for the Embro soil profile caused by greater upward water movement into the 1.25 m profile. Due to the adjustments to the lower boundary water content and soil temperature conditions in this work, soil type had an influence on the water balance that was not apparent in our previous work. The most critical regions for monitoring water surplus occur in the snow belt region east of Lake Huron and in areas where sandy soils predominate as shown for Smithfield. en
dc.description.sponsorship Innovation and Risk Management Branch, Ontario Ministry of Agriculture, Food and Rural Affairs; and Pioneer Hi-Bred Limited. en
dc.language.iso en en
dc.publisher Dept. of Land Resource Science, OAC University of Guelph Guelph, Ontario N1G 2W1 en
dc.relation.ispartofseries Land Resource Science Technical Memo.;2003-1
dc.subject Soil Water en
dc.subject Evapotranspiration en
dc.subject Deep drainage en
dc.subject Runoff en
dc.title Identification of Critical Regions for Water Quality Monitoring with Respect to Seasonal and Annual Water Surplus en
dc.type Technical Report en
dc.contributor.affiliation School of Environmental Sciences
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dcterms.relation Fallow, D.J., D.M. Brown, G.W. Parkin, J.D. Lauzon and C. Wagner-Riddle. 2003. Identification of Critical Regions for Water Quality Monitoring with Respect to Seasonal and Annual Water Surplus. University of Guelph. Department of Land Resource Science. Tech. Memo No. 2003-1. 149 pp.

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