Ground-water quality and flow in a shallow glaciofluvial aquifer impacted by agricultural contamination

被引:14
作者
Kehew, AE
Straw, WT
Steinmann, WK
Barrese, PG
Passarella, G
Peng, WS
机构
[1] ENVIROL TECHNOL INC,KALAMAZOO,MI 49001
[2] SOIL & MAT ENGN INC,PLYMOUTH,MI 48170
[3] CNR,IRSA,I-70126 BARI,ITALY
[4] DELL ENGN INC,HOLLAND,MI 49424
关键词
D O I
10.1111/j.1745-6584.1996.tb02030.x
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Prairie Ronde fan, a discrete glaciofluvial deposit in southwestern Michigan, contains a productive but highly vulnerable unconfined aquifer used for irrigation, municipal, and domestic supply, A comprehensive hydrogeological study of the aquifer delineated shallow, local flow systems that interact with ponds and wetlands on the fan surface, overlying a deeper intermediate/regional flow system extending to the base of the glacial drift, Ground water within the shallow flow systems contains tritium concentrations indicative of a post-bomb age and is heavily impacted by nonpoint source contamination, Nitrate commonly exceeds drinking water standards in the shallow flow system, Although no continuous physical barrier separates the two flow systems, the deeper flow system is generally lacking in tritium as well as nonpoint source contaminants derived from surface land uses, High capacity pumping from the deeper flow system, however, will likely draw contaminants downward from the shallow flow system, Background-water quality in the aquifer is controlled by equilibrium with calcite and slight undersaturation with respect to dolomite, No spatial trends in major ions were observed, suggesting that carbonate mineral equilibrium is achieved rapidly in the vadose zone and further chemical evolution along ground-water flow paths is minimal, Iron concentrations are highly variable in the aquifer and not correlated with depth, Recharge from lakes and wetlands is a significant cause of elevated iron concentrations in the shallow flow systems.
引用
收藏
页码:491 / 500
页数:10
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