Estimating phosphorus concentrations following alum treatment using apparent settling velocity
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |