External Phosphorus Loading in New Lakes
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External Phosphorus Loading in New Lakes. / Kragh, Theis; Kolath, Thor; Kolath, Anja Svane; Reitzel, Kasper; Martinsen, Kenneth Thorø; Søndergaard, Martin; Hoffmann, Carl Christian; Baastrup-Spohr, Lars; Egemose, Sara.
In: Water, Vol. 14, No. 7, 1008, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - External Phosphorus Loading in New Lakes
AU - Kragh, Theis
AU - Kolath, Thor
AU - Kolath, Anja Svane
AU - Reitzel, Kasper
AU - Martinsen, Kenneth Thorø
AU - Søndergaard, Martin
AU - Hoffmann, Carl Christian
AU - Baastrup-Spohr, Lars
AU - Egemose, Sara
N1 - Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022
Y1 - 2022
N2 - The water quality of lakes is highly dependent on external phosphorus (P) loading. The vast external loadings from sewage and other wastewater discharge that European lakes have historically received have been dramatically reduced today by improved wastewater treatment. Gaining knowledge of the catchment characteristics that influence external P-loading should enable predictions of the achievable water quality of lakes. In this study, we tested this proposition. Data from 90 new Danish lakes show no apparent relationship between the mean summer P-concentration and the size or land use of the catchments. The external P-loading and resulting annual P-concentration were further investigated on a representative subset of 12 of the new lakes, using six methods. Three of the methods used empirical estimates of P-transport from catchments, based on the national average P-transport, runoff-dependent P-transport, and crop-dependent P-transport, and the other three methods used different empirical models tested on the lakes. External P-loading was reliably predicted by several of the methods. The predictions of the annual P-concentration were highly dependent on the inclusion of annual runoff. However, the predicted P-concentrations were generally overestimated, most pronounced for the nutrient-poor and most recently established lakes. In these lakes, internal P-loading was found to be the most important factor in predicting achievable water quality.
AB - The water quality of lakes is highly dependent on external phosphorus (P) loading. The vast external loadings from sewage and other wastewater discharge that European lakes have historically received have been dramatically reduced today by improved wastewater treatment. Gaining knowledge of the catchment characteristics that influence external P-loading should enable predictions of the achievable water quality of lakes. In this study, we tested this proposition. Data from 90 new Danish lakes show no apparent relationship between the mean summer P-concentration and the size or land use of the catchments. The external P-loading and resulting annual P-concentration were further investigated on a representative subset of 12 of the new lakes, using six methods. Three of the methods used empirical estimates of P-transport from catchments, based on the national average P-transport, runoff-dependent P-transport, and crop-dependent P-transport, and the other three methods used different empirical models tested on the lakes. External P-loading was reliably predicted by several of the methods. The predictions of the annual P-concentration were highly dependent on the inclusion of annual runoff. However, the predicted P-concentrations were generally overestimated, most pronounced for the nutrient-poor and most recently established lakes. In these lakes, internal P-loading was found to be the most important factor in predicting achievable water quality.
KW - catchment analysis
KW - diffuse P-loading
KW - internal P-loading
KW - lake establishment
KW - lake eutrophication
KW - P-transport modeling
KW - point sources
U2 - 10.3390/w14071008
DO - 10.3390/w14071008
M3 - Journal article
AN - SCOPUS:85127536526
VL - 14
JO - Water
JF - Water
SN - 1462-897X
IS - 7
M1 - 1008
ER -
ID: 304870605