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切換: 標籤 | MARC模式 | ISBD

Evaluating morphology-driven hyporhe...

Fanelli, Rosemary M.

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Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream./
作者:	Fanelli, Rosemary M.
面頁冊數:	82 p.
附註:	Adviser: Laura Lautz.
Contained By:	Masters Abstracts International45-05.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1442461

Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream.
Fanelli, Rosemary M.

Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream. - 82 p.

Adviser: Laura Lautz.

Thesis (M.S.)--State University of New York College of Environmental Science and Forestry, 2007.

Keywords. Hyporheic exchange; in-stream obstructions; temperature; biogeochemistrySubjects--Topical Terms:

545717
Biogeochemistry.

Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream.
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245 1 0 $a Evaluating morphology-driven hyporheic exchange and subsurface biogeochemical cycling in a semi-arid stream.
300 $a 82 p.
500 $a Adviser: Laura Lautz.
500 $a Source: Masters Abstracts International, Volume: 45-05, page: 2434.
502 $a Thesis (M.S.)--State University of New York College of Environmental Science and Forestry, 2007.
520 $a Keywords. Hyporheic exchange; in-stream obstructions; temperature; biogeochemistry
520 $a Hyporheic exchange, enhanced by complex streambed morphology, can influence the type and rate of biogeochemical cycling in the subsurface. These processes chemically alter water passing temporarily through the subsurface, which eventually returns to the surface channel. I instrumented two 20 m long reaches, each containing a small log dam, with in-stream minipiezometers and temperature data loggers to simultaneously observe pore water geochemistry and streambed temperature dynamics in order to assess the degree of biogeochemical cycling induced by the log dams. Upstream of the dams, low permeability sediments supported enhanced hyporheic anaerobic cycling. Downstream of the dams, the subsurface was oxygen-rich and supported nitrification. Groundwater upwelling was observed further downstream at the bottom of the riffle. Assessing types and rates of subsurface biogeochemical cycling may be facilitated by coupling streambed temperature measurements with hyporheic water geochemistry, and can aid in understanding how hyporheic exchange contributes to overall stream biogeochemistry.
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650 4 $a Hydrology. $3 545716
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