Investigation of light attenuation in Lake Eymir

Atiker, Selen
Light penetration and attenuation has significant impact on the water quality of lakes. Algal activity, which is important for the levels of several water quality parameters, is dependent on light penetration besides availability of nutrients. In this study, change in light penetration and attenuation in Lake Eymir was studied. The relationships of extinction coefficient (ke), and water quality parameters were investigated. The effect of ke on Chl-a over nutrients were investigated. The water quality parameters measured were; total suspended solid (TSS), phosphate, ammonium, nitrate, photosynthetically active radiation (PAR), chlorophyll-a (Chl-a), Secchi disk depth and lake Depth. The measurements were conducted at five different stations in Lake Eymir. Secchi disk, PAR and lake depth measurements were done on site, while TSS, Chl-a and phosphate analyses were done in laboratory, using standard methods. Nitrate and ammonium analyses were conducted through laboratory kits. Linear and non-linear regression models of ke and Chl-a were developed to understand their relationships with the the measured parameters, using XLSTAT software. Analyses of the data at sampling stations revealed that Station 2 and 3 were the most representative stations in general. The model results indicated that ke is as important as nutrients for Chl-a abundance. Secchi disk and Chl-a are the most correlated parameters with ke. Moreover Secchi disk depth is nonlinearly correlated with ke, while linearly correlation is present between Chl-a and ke.


SOYUPAK, S; Gökçay, Celal Ferdi; YERLI, S; ERDEN, S; AKBAY, N; CILESIZ, AF (1994-03-01)
Water quality properties and trophic status of Keban Dam Reservoir have been assessed in detail. The dissolved oxygen contours exhibited somewhat unusual behaviour of temporarily established intermediate layers of low dissolved oxygen concentrations. The phytoplankton species were identified and their composition was evaluated. The reservoir is eutrophic in general terms. However, lotic and limnetic zones of the reservoir have shown different trophic status.
Spatial data analysis for monitoring and prediction of selected water quality parameters in reservoirs: Porsuk Dam reservoir case
Yenilmez, Firdes; Aksoy, Ayşegül; Düzgün, H. Şebnem; Department of Environmental Engineering (2014)
In the design of a water quality monitoring network, selection of water quality sampling locations is crucial to adequately represent the water quality of the water body when high costs of analyses and field work are taken into account. In this study, a new approach was proposed to identify the representative water quality sampling locations in reservoirs and lakes using geostatistical tools for estimation of spatial distribution of selected water quality parameters. To do so, kernel density estimation (KDE...
Evaluation of eutrophication control strategies for the Keban Dam reservoir
Soyupak, S; Mukhallalati, L; Yemisen, D; Bayar, A; Yurteri, C (1997-04-15)
The reservoir of the Keban Dam in eastern Anatolia is a very deep and large water body subject to significant seasonal water level fluctuations within a given hydrological year. At the present time, different sections of the reservoir have different trophic status and the upper portion of the reservoir, in particular, is eutrophic. In this regard, there is a need for the assessment of alternative strategies to be implemented for phosphorus and thus eutrophication control in this segment of the reservoir. In...
Modeling the water quality of lake eymir using artificial neural networks (ann) and adaptive neuro fuzzy inference system (anfis)
Aslan, Muhittin; Aksoy, Ayşegül; Department of Environmental Engineering (2008)
Lakes present in arid regions of Central Anatolia need further attention with regard to water quality. In most cases, mathematical modeling is a helpful tool that might be used to predict the DO concentration of a lake. Deterministic models are frequently used to describe the system behavior. However most ecological systems are so complex and unstable. In case, the deterministic models have high chance of failure due to absence of priori information. For such cases black box models might be essential. In th...
Assessment of seawater intrusion in a coastal aquifer by using correlation, principal component, and factor analyses
Karahanoğlu, Nurkan (Wiley, 1997-05-01)
Hydrogeochemical characterization of the Erzin Plain coastal aquifer has been accomplished in this research to investigate the spatial and transient behavior of its water quality. The aquifer is located along the Mediterranean coast and forms one of the most productive aquifers in Turkey. Chemical analyses of groundwater samples collected from the aquifer during 1964-1968 (128 samples), May 1993 (30 samples), October 1993 (37 samples), and June 1994 (20 samples) constitute the available groundwater quality ...
Citation Formats
S. Atiker, “Investigation of light attenuation in Lake Eymir,” M.S. - Master of Science, Middle East Technical University, 2012.