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The deposition, diagenesis and recycle of sedimentary phosphorus in a hypereutrophic lake.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The deposition, diagenesis and recycle of sedimentary phosphorus in a hypereutrophic lake./
作者:	Penn, Michael Robert.
面頁冊數:	1 online resource (234 pages)
附註:	Source: Dissertations Abstracts International, Volume: 56-10, Section: B.
Contained By:	Dissertations Abstracts International56-10B.
標題:	Freshwater ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9513850click for full text (PQDT)
ISBN:	9798208388921

The deposition, diagenesis and recycle of sedimentary phosphorus in a hypereutrophic lake.
Penn, Michael Robert.

The deposition, diagenesis and recycle of sedimentary phosphorus in a hypereutrophic lake. - 1 online resource (234 pages)

Source: Dissertations Abstracts International, Volume: 56-10, Section: B.

Thesis (Ph.D.)--Michigan Technological University, 1994.

Includes bibliographical references

This dissertation describes the development of a long-term, linked sediment and water column model for total phosphorus (TP) in hypereutrophic lakes. The model was developed in parallel with an extensive field monitoring and laboratory experimental program. The model treats the water column as a completely mixed system coupled with one homogeneous sediment layer as the depositional area of the lake. A simplified phosphorus (P) cycle is incorporated in the model including: settling of TP from the water column and deposition to the sediments, diagenesis (defined here as the transformation of particulate P to dissolved P within the sediments) and subsequent diffusion (release) to the water column. Field measurements of deposition and sediment release of P over the annual cycle were used for model validation. The model is applied to simulate the extent and time-course of the recovery of Onondaga Lake (Syracuse, NY) to proposed remediation measures such as wastewater effluent diversion. Sequential chemical extractions were performed on both sediment and seston P. A method is presented to estimate the labile, or exchangeable, P fraction of the TP which is ultimately subject to diagenesis, and diagenetic rate constants which are utilized in the model. From sediment profiles two distinct forms of labile P were apparent: (1) "fast" labile P with a rate constant of 4.8 yrˉ¹ (half life of 0.1 year) within the uppermost ~2 cm of the sediment representing freshly deposited P, and (2) "slow" labile P with a rate constant of 0.1 yrˉ¹ (half life of 7 years) throughout the sediment to a depth of ~30 cm, below which all sediment P was refractory. Lake and sediment response is ultimately governed by "slow" diagenesis. Deterministic model simulations of wastewater effluent diversion predict that summer epilimnetic TP concentrations in the lake will decrease from ~63 μgP.Lˉ¹ to ~35 μgP.Lˉ¹ within one year due to the >60% reduction in external TP loading, reaching a steady-state concentration of 29 μgP.Lˉ¹ in ~30 years. Monte Carlo analyses incorporating variability in tributary flows and TP loads were performed to predict probabilities of meeting water quality goals.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798208388921Subjects--Topical Terms:

600668
Freshwater ecology.
Subjects--Index Terms:

eutrophicationIndex Terms--Genre/Form:

542853
Electronic books.

The deposition, diagenesis and recycle of sedimentary phosphorus in a hypereutrophic lake.
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502 $a Thesis (Ph.D.)--Michigan Technological University, 1994.
504 $a Includes bibliographical references
520 $a This dissertation describes the development of a long-term, linked sediment and water column model for total phosphorus (TP) in hypereutrophic lakes. The model was developed in parallel with an extensive field monitoring and laboratory experimental program. The model treats the water column as a completely mixed system coupled with one homogeneous sediment layer as the depositional area of the lake. A simplified phosphorus (P) cycle is incorporated in the model including: settling of TP from the water column and deposition to the sediments, diagenesis (defined here as the transformation of particulate P to dissolved P within the sediments) and subsequent diffusion (release) to the water column. Field measurements of deposition and sediment release of P over the annual cycle were used for model validation. The model is applied to simulate the extent and time-course of the recovery of Onondaga Lake (Syracuse, NY) to proposed remediation measures such as wastewater effluent diversion. Sequential chemical extractions were performed on both sediment and seston P. A method is presented to estimate the labile, or exchangeable, P fraction of the TP which is ultimately subject to diagenesis, and diagenetic rate constants which are utilized in the model. From sediment profiles two distinct forms of labile P were apparent: (1) "fast" labile P with a rate constant of 4.8 yrˉ¹ (half life of 0.1 year) within the uppermost ~2 cm of the sediment representing freshly deposited P, and (2) "slow" labile P with a rate constant of 0.1 yrˉ¹ (half life of 7 years) throughout the sediment to a depth of ~30 cm, below which all sediment P was refractory. Lake and sediment response is ultimately governed by "slow" diagenesis. Deterministic model simulations of wastewater effluent diversion predict that summer epilimnetic TP concentrations in the lake will decrease from ~63 μgP.Lˉ¹ to ~35 μgP.Lˉ¹ within one year due to the >60% reduction in external TP loading, reaching a steady-state concentration of 29 μgP.Lˉ¹ in ~30 years. Monte Carlo analyses incorporating variability in tributary flows and TP loads were performed to predict probabilities of meeting water quality goals.
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653 $a nutrient cycling
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