An Investigation Of Potential For Groundwater Contamination From Pesticide Leaching In Soils Near The Buffalo River Of Clay County Minnesota
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Author | : Srinivas Repala |
Publisher | : |
Total Pages | : 188 |
Release | : 1994 |
Genre | : Buffalo River Watershed (Minn.) |
ISBN | : |
Download An Investigation of Potential for Groundwater Contamination from Pesticide Leaching in Soils Near the Buffalo River of Clay County, Minnesota Book in PDF, Epub and Kindle
Author | : James R. Stark |
Publisher | : |
Total Pages | : 58 |
Release | : 1987 |
Genre | : Groundwater |
ISBN | : |
Download Ground-water and soil contamination near two pesticide-burial sites in Minnesota Book in PDF, Epub and Kindle
Author | : United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight |
Publisher | : |
Total Pages | : 528 |
Release | : 1989 |
Genre | : Drinking water |
ISBN | : |
Download Contamination of Ground Water by Pesticides Book in PDF, Epub and Kindle
Author | : Elizabeth G. Nielsen |
Publisher | : |
Total Pages | : 48 |
Release | : 1987 |
Genre | : Agricultural chemicals |
ISBN | : |
Download The Magnitude and Costs of Groundwater Contamination from Agricultural Chemicals Book in PDF, Epub and Kindle
Author | : R.P. Scorza Junior |
Publisher | : |
Total Pages | : 468 |
Release | : 2002 |
Genre | : |
ISBN | : |
Download Pesticide Leaching in Macroporous Clay Soils Book in PDF, Epub and Kindle
The presence of macropores (i.e. shrinkage cracks, earthworm and root channels) in the unsaturated zone can enhance pesticide leaching to groundwater and therefore increase the risk of groundwater contamination. In this thesis, experimental and modeling approaches were used to obtain a better understanding of the processes that affect pesticide leaching in cracked clay soils at the field scale. A field experiment (1.2 ha) was conducted to study the movement of water and bromide, and of two pesticides with contrasting mobility (bentazone and imidacloprid). A rapid breakthrough of bromide and pesticides in drain water and groundwater was observed, which is a strong evidence for preferential transport in this soil. Two pesticide leaching models were tested using the data from the field experiment: (i) the chromatographic flow model PEARL and (ii) the preferential flow model MACRO. The calibration of PEARL indicated that a large dispersion length was necessary to simulate bromide leaching in this soil correctly, which implies a large non-uniformity of solute transport. This calibration worked well for the mobile pesticide bentazone but not for imidacloprid, which is moderately adsorbed. So the solute transport in this cracked clay soil could not be described with the convection-dispersion equation even after increasing the dispersion length. The bulk of bentazone leaching was underestimated with MACRO although it simulated the leaching of imidacloprid reasonably well. The fast transport of all substances via macropore flow could be simulated well with MACRO although calibration of some sensitive and difficult to measure parameters was necessary. Considering that preferential flow may depend on the processes at the soil surface, a model that simulates water infiltration, overland flow, macropore flow and water storage at soil surface was developed. Simulations revealed that macropores at the soil surface can receive water before the maximum water storage at soil is reached. Therefore, the frequently used assumption that overland flow only starts after the maximum water storage at soil surface is attained can lead to underestimation of macropore flow for short showers.
Author | : |
Publisher | : |
Total Pages | : 72 |
Release | : 1999 |
Genre | : Groundwater |
ISBN | : |
Download Distribution of Major Herbicides in Ground Water of the United States Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 44 |
Release | : 1987 |
Genre | : Groundwater |
ISBN | : |
Download Evaluating Potential Groundwater Contamination from Contaminated Soils Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 112 |
Release | : 1986 |
Genre | : Groundwater |
ISBN | : |
Download State Program Briefs Book in PDF, Epub and Kindle
Author | : Thomas J. Tague |
Publisher | : |
Total Pages | : 128 |
Release | : 1994 |
Genre | : |
ISBN | : |
Download An Assessment of the Potential Pesticide Contamination of Groundwater Utilizing the Surface Soil and Leachp Models Book in PDF, Epub and Kindle
Author | : American Water Resources Association. Spring Symposium |
Publisher | : |
Total Pages | : 756 |
Release | : 1995 |
Genre | : Water conservation |
ISBN | : |
Download Water Conservation in the 21st Century Book in PDF, Epub and Kindle