Determination and assessment of phosphorus assimilation capacity applying Vollenweider approach for Hazar Lake

Year 2021, Volume: 9 Issue: Special 1, 72 - 81, 30.04.2021

Selma Ayaz , Mehmet Dilaver

https://doi.org/10.51354/mjen.889406

Abstract

 Eutrophication is a natural process for natural lakes and dams and the hydraulic retention time of this process is directly related to whether the assimilation capacity is exceeded depending on the current water quality and pressures consists of point and diffuse sources. Exceeding assimilation capacity is accepted good for biological productivity however this situation cannot be desired for water resources any time and preventive actions need to be taken to sustain good water quality. The Vollenweider OECD Method is a widely used and accepted approach in order to calculate current phosphorus loads for phosphorus limiting lakes and dams. In addition to OECD method, rational method is used frequently in calculating the flowrates via surface run-off after precipitation. In this study, the calculation of the assimilation capacity for phosphorus limiting lakes and dams using the Vollenweider Method and rational method for calculation of flowrates were applied for Hazar Lake’s Basin example. When the apply proposed approach Hazar Lake’s TP loading might be increased 3.7 times a year for desired oligotrophic upper boundary condition and 13.7 times a year for mesotrophic state boundary condition.

Keywords

Hazar Lake, Vollenweider method, phosphorus assimilation capacity

Supporting Institution

TC Orman ve Su İşleri Bakanlığı

Project Number

5128603

Thanks

This study was prepared within the scope of the project “Determination of Sensitive Areas and Water Quality Objectives for Turkish River Basin Districts” (2012–2015) conducted by the former Ministry of Forestry and Water Affairs/Directorate General for Water Management in collaboration with TUBITAK MRC Environment and Cleaner Production Institute. The authors thank the General Directorate of Water Management for financial support. The lake monitoring studies were carried out by Fırat University (Prof. Dr. Bülent Şen, Prof. Dr. Feray Sönmez and their team). The authors also thank TUBITAK MRC Environment and Cleaner Production Institute's laboratory staff and GIS team for their valuable support.

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