Estimating phosphorus concentrations following alum treatment using apparent settling velocity

Lake and Reservoir Management
By:  and 

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Abstract

he apparent settling velocity (Vs) is a term used in empirical, steady-state, mass-balance lake models to represent the net phosphorus flux from the water column. The Vollenweider (1969) mixed-reactor lake model was rearranged and used to calculate Vs values for total phosphorus (TP) for three lakes treated with alum to reduce the internal flux of P to the water column (Delavan Lake, Wisconsin; Lake Morey, Vermont; and West Twin Lake, Ohio). An analysis of Vs values was conducted using data from these three lakes for both the pre- and post-alum treated conditions. Analysis of Vs values for both the pre- and post-alum conditions in Lake Morey and West Twin Lake resulted in a post-treatment mean Vs value of 7 ± 2.0 m·yr−1. The effect of the alum treatment, although short-lived in Delavan Lake, resulted in a mean post-treatment Vs value of 3.4 ± 0.3 m·yr−1. The consistency in the post-treatment Vs values in Lake Morey and West Twin Lake is used to demonstrate a predictive analysis method for water column TP concentrations in lakes following a successful treatment of the anoxic sediment area with alum. Additional pre- and post-alum in-lake and watershed loading data are needed to advance this concept into a management model.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Estimating phosphorus concentrations following alum treatment using apparent settling velocity
Series title Lake and Reservoir Management
DOI 10.1080/07438149909353949
Volume 15
Issue 1
Year Published 2009
Language English
Publisher North American Lake Management Society
Description 11 p.
First page 28
Last page 38
Country United States
State Ohio, Vermont, Wisconsin
Other Geospatial Lake Delevan, Lake Morey, West Twin Lake
Online Only (Y/N) N
Additional Online Files (Y/N) N