Investigation of non-point source pollution potential in the watershed of porsuk dam reservoir

Küçük, Elif
The achievement of good water quality status depends not only on point source control, but also on minimizing the contribution of non-point sources on pollution. Although non-point source pollution includes numerous components, agriculture has been considered as the primary activity responsible from deterioration in the quality of water resources. In this thesis, a hypothetical assessment was conducted to assess the relative impacts of different agricultural practices on the Watershed of the Porsuk Dam Reservoir (PDR). For this purpose, geographic information system (GIS) integrated Soil Water Assessment Tool (ArcSWAT2009) was used. Model performance was evaluated via Nash-Sutcliffe (NSE) and absolute percent deviation between simulated and observed yearly average flow values. Following manual calibration process, vulnerable areas for phosphorus transport were determined for ten different agricultural practice scenarios. These scenarios were developed to understand the effects of varying fertilizer and irrigation rates, land use changes and point source phosphorus loads on “soluble mineral forms of phosphorus transported by surface runoff into reaches” (SOLP). The most effective management scenario in terms of reduction in SOLP loads was determined as the combination of 50% and 20% decrease in fertilizer and irrigation rates, respectively. The corresponding decrease in the overall SOLP load to the PDR was calculated as 40%. In this scenario, mostly fertilizer reduction was effective in SOLP reduction. The most critical sub-basin that is responsible for the considerable SOLP load was determined. Moreover, other sub-basins which can be considered as the high concern areas within the watershed to control SOLP loads were identified.


Rehabilitation of water supply systems
Toğrul, Nevzat; Merzi, Nuri; Department of Civil Engineering (2015)
Management of water supply systems by an economic and efficient way is a significant issue for water authorities. Selection and operation of water supply elements appropriately to satisfy water need affects the energy consumption of the system. This study aims to constitute a long term rehabilitation plan for water supply elements (only storage tanks, pumps and transmission line pipes are in the scope of the study). A case study has been performed on N8.3 pressure zone of Ankara water distribution network. ...
Modelling the temporal variation in snow-covered area derived from satellite images for simulating/forecasting of snowmelt runoff in Turkey
Tekeli, AE; Akyurek, Z; Sensoy, A; Sorman, AA; Sorman, U (Informa UK Limited, 2005-08-01)
Monitoring the change of snow-covered area (SCA) in a basin is vitally important for optimum operation of water resources, where the main contribution comes from snowmelt. A methodology for obtaining the depletion pattern of SCA, which is based on satellite image observations where mean daily air temperature is used, is applied for the 1997 water year and tested for the 1998 water year. The study is performed at the Upper Euphrates River basin in Turkey (10 216 km(2)). The major melting period in this basin...
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...
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.
Estimation of river flow by artificial neural networks and identification of input vectors susceptible to producing unreliable flow estimates
Kentel Erdoğan, Elçin (Elsevier BV, 2009-09-15)
Reliable river flow estimates are crucial for appropriate water resources planning and management. River flow forecasting can be conducted by conceptual or physical models, or data-driven black box models. Development of physically-based models requires an understanding of ail the physical processes which impact a natural process and the interactions among them. Since identification of the relationships among these physical processes is very difficult, data-driven approaches have recently been utilized in h...
Citation Formats
E. Küçük, “Investigation of non-point source pollution potential in the watershed of porsuk dam reservoir,” M.S. - Master of Science, Middle East Technical University, 2013.