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Characterization and modeling of pes...

Springer, Abraham E.

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Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer./
作者:	Springer, Abraham E.
面頁冊數:	234 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-10, Section: B, page: 4299.
Contained By:	Dissertation Abstracts International55-10B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9505298

Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer.
Springer, Abraham E.

Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer. - 234 p.

Source: Dissertation Abstracts International, Volume: 55-10, Section: B, page: 4299.

Thesis (Ph.D.)--The Ohio State University, 1994.

Two tracer tests were conducted at the Ohio Management Systems Evaluation Area near Piketon, Ohio, to characterize the fate and transport of reactive and nonreactive solutes in an agricultural setting. One test consisted of normal agricultural application of atrazine, alachlor, and nitrogen at land surface. The unattenuated transport of the solutes through the vadose zone to the 2.8 to 5.0 meter deep water table was traced with bromide. Between 70 and 118 percent of the total applied mass of bromide was observed in five sets of deep soil cores collected from September 1991 to February 1994. Less than 15 percent of the total applied mass of bromide was observed in the aquifer. Movement of bromide through the vadose zone was approximately 60 to 80 cm/yr.Subjects--Topical Terms:

516570
Geology.

Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer.
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100 1 $a Springer, Abraham E. $3 1940037
245 1 0 $a Characterization and modeling of pesticide fate and transport in a shallow unconfined aquifer.
300 $a 234 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-10, Section: B, page: 4299.
500 $a Adviser: E. Scott Bair.
502 $a Thesis (Ph.D.)--The Ohio State University, 1994.
520 $a Two tracer tests were conducted at the Ohio Management Systems Evaluation Area near Piketon, Ohio, to characterize the fate and transport of reactive and nonreactive solutes in an agricultural setting. One test consisted of normal agricultural application of atrazine, alachlor, and nitrogen at land surface. The unattenuated transport of the solutes through the vadose zone to the 2.8 to 5.0 meter deep water table was traced with bromide. Between 70 and 118 percent of the total applied mass of bromide was observed in five sets of deep soil cores collected from September 1991 to February 1994. Less than 15 percent of the total applied mass of bromide was observed in the aquifer. Movement of bromide through the vadose zone was approximately 60 to 80 cm/yr.
520 $a A separate tracer test was conducted to characterize the fate and transport of bromide, atrazine, and alachlor in the shallow groundwater system. Tracers were introduced into in a well screened at the water table and were transported under a natural hydraulic gradient. The distribution of bromide was used to calculate a longitudinal dispersivity of 9 cm over a distance of 1 m from the injection well and 140 cm over a distance of 5 m from the injection well. Laboratory and field tests indicated adsorption of atrazine and alachlor, despite the low organic-carbon content of the aquifer material. A mean laboratory-measured atrazine retardation factor of 2.4 and a mean field-measured atrazine retardation factor of 6.1 were calculated. A mean laboratory-measured alachlor retardation factor of 2.5 and a mean field-measured alachlor retardation factor of 7.1 were calculated. Although laboratory tests indicated the potential of the aquifer to degrade atrazine, no degradation products of atrazine were observed in the field.
520 $a A two-dimensional, variably-saturated flow and transport model was used to simulate bromide, atrazine, and alachlor transport in the aquifer. The calibrated model used flow and transport properties measured in the field and in the laboratory. The model simulated the small vertical flow components in the aquifer which limited of transport of agrichemicals at depth in the water table. Concentrations of pesticides were reduced as much as 98 percent after only 20 days of transport through 1 m of aquifer.
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650 4 $a Hydrology. $3 545716
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710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 55-10B.
790 1 0 $a Bair, E. Scott, $e advisor
790 $a 0168
791 $a Ph.D.
792 $a 1994
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9505298