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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0378377402001245
Last checked: 05/30/2013
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Chanasyk, D. S.;
Mapfumo, E.;
Willms, W. |
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| Author Affiliation: | Chanasyk and Mapfumo: Department of Renewable Resources, University of Alberta, Edmonton, Alberta., Canada; Willms: Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta., Canada |
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| Title: | Quantification simulation of surface runoff from fescue grassland watersheds |
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| Source: | Agricultural Water Management. Vol. 59, No. 2, March 2003, p. 137-153. |
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| Publishing Information: | [Amsterdam]: Elsevier Scientific Pub. |
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| # of Pages: | 17 |
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| Keywords: | TIC Keywords: Surface runoff; Soil loss; Hydrology; Precipitation; Grasslands; Watersheds; Calibrations; Models; Grazing; Weather
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| Abstract/Contents: | "The topographic features of the foothills fescue grasslands in southern Alberta predispose them to runoff and soil loss via erosion. A study was conducted at Stavely Research Station, Alberta to determine the runoff from small grassland watersheds under three grazing intensities, viz. ungrazed (or control), heavy (2.4 animal unit months per hectare (AUM ha-1)) and very heavy (4.8 AUM ha-1) grazing. Total annual precipitation on 1998, 1999 and 2000 was 648, 399 and 263 mm, respectively. Surface runoff hydrographs indicated large summer storm runoff rates from heavy grazed compared to other watersheds, but large snow melt-induced runoff from very heavy compared to other watersheds, but large snow melt-induced runoff from very heavy grazed compared to other watersheds. Surface runoff rates measured from May and August ranged between 0 and 2.3 mm per day in 1998, 0-0.2 mm per day in 1999, and 0-0.07 mm per day in 2000. In all the years, the average rainfall runoff was <10% of average daily precipitation on all three watersheds. In 2000, snow melt-induced runoff was measured in March. Total surface runoff for this month was 0.07, 8.5 and 3.7 mm for ungrazed, heavy and very heavy watersheds, respectively. These accounted for 78, 96 and 92% of total annual runoff from ungrazed, heavy, and very heavy watersheds, respectively. Surface runoff for 1999 and 2000 was simulated using Soil Water Assessment Tool (SWAT), a continuous time distributed parameter model developed for ungaged basins. Model calibration was conducted using data of 1998 and parameters adjusted until the predicted and observed results were visibly close. Evaluation of the model was conducted using statistical criteria that included calculations of average error (AE), residual mean square (RMS), coefficient of residual mass (CRM) and modeling efficiency (EF), and comparing these statistics against optimal values. The evaluation indicated that the model under-predicted surface runoff from the watershed in both years." |
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| Language: | English |
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| References: | 27 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Chanasyk, D. S., E. Mapfumo, and W. Willms. 2003. Quantification simulation of surface runoff from fescue grassland watersheds. Agric. Water Manage. 59(2):p. 137-153. |
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| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0378377402001245
Last checked: 05/30/2013
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 494.5 W3 A34 |
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