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Geochemical mass-balance in a small forested watershed in southwestern Pennsylvania

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Abstract

An intensive hydrologic investigation of the North Fork Bens Creek Watershed on Laurel Hill in southwestern Pennsylvania was made during 1984-85. Precipitation was sampled weekly, and stream water was sampled monthly and during selected storms for discharge and chemical composition. The watershed is underlain by sandstone and sandy shale consisting of quartz, feldspar, muscovite, chlorite, calcite, and kaolinite. Watershed chemical flux for the sum of Ca++, Mg++, Na+, and K+ shows that solutes from wet deposition account for 19 to 21 percent of the load in runoff from the watershed. Cation exchange and weathering account for the net changes in the chemistry of streamflow. Alteration of orthoclase, muscovite, chlorite, and albite to kaolinite accounts for 36 percent of the neutralization of H+ resulting from precipitation input and carbonic-acid weathering. Dissolution of calcite accounts for 34 percent of H+ neutralization. Dissolution of aluminum-bearing minerals in the soil matrix accounts for 25 percent of H+ neutralization.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Geochemical mass-balance in a small forested watershed in southwestern Pennsylvania
ISBN:
0872628116
Year Published:
1991
Language:
English
Publisher:
Publ by ASCE
Publisher location:
New York, NY, United States
First page:
516
Last page:
523
Conference Title:
Proceedings of the 1991 National Conference on Irrigation and Drainage
Conference Location:
Honolulu, HI, USA
Conference Date:
22 July 1991 through 26 July 1991