Browsing by Author "Muhammetoglu, A"

Now showing 1 - 5 of 5

Citation - WoS: 4
Citation - Scopus: 5
Assessment of Nitrogen Excess in an Agricultural Area Using a Nitrogen Balance Approach
(I W A Publishing, 2005) Muhammetoglu, H; Muhammetoglu, A; Soyupak, S
A pilot study has been initiated to develop an approach for quantification of nitrogen excesses from agricultural activities that involve greenhouse farming in Kumluca Plain, Turkey. Detailed calculations utilizing the nitrogen balance method (NBM) were carried out at nine different locations within the plain over a time period of one year. The major contributing factors and governing operative mechanisms taken into consideration were nitrogen application rates both as organic and chemical fertilizers, irrigation water to application practices, and nitrogen uptake by plants. The adopted approach yielded valuable information such as plant nitrogen uptake efficiencies, excess nitrogen, leaching rates and leachate nitrogen concentrations. Further, a site specific multiple linear regression model has been developed to estimate the ratio (N-leachate/N-groundwater) as a function of independent variables: farming age, excess nitrogen application and SEEPAGE Index Number. The negative sign of the model parameters implies that the ratio (N-leachate/N-groundwater) decreases as values of the independent variables increase. The adopted approach and the obtained results can beneficially be applied to similar sites to establish basic parameters of irrigation and fertilizer application operations.
Citation - WoS: 5
Citation - Scopus: 3
Evaluation of Efficiencies of Diffuse Allochthonous and Autochthonous Nutrient Input Control in Restoration of a Highly Eutrophic Lake
(I W A Publishing, 2002) Muhammetoglu, A; Muhammetoglu, H; Soyupak, S
Mogan Lake is an important recreational area for Metropolitan Ankara-Turkey. It is a shallow eutrophic lake with a dense growth of macrophytes. The main contributors of nutrients and other pollutants to the lake are the creeks carrying the runoff water from the watershed and upland farming land, in addition to the domestic and industrial wastewater discharges from a nearby town and industries. Hydrodynamic and water quality modeling techniques were used to determine the optimum management schemes for the lake restoration and diffuse pollution control. Management scenarios were devised and tested to control allochthonous and autochthonous nutrient inputs to the lake. Phosphorus and nitrogen load reductions were the main test elements for the control of allochthonous nutrient inputs. The scenario analysis revealed that reduction of phosphorus and nitrogen loads from diffused sources will have a marginal effect on controlling eutrophication if macrophyte growth is left uncontrolled. Scenarios employing macrophyte harvesting and sediment dredging have been evaluated for autochthonous nutrient input control. Sediment dredging alone has been shown to yield the most favorable conditions for water quality improvement in Mogan Lake. Further, control of diffuse pollution was an essential final step to achieve an acceptable long-term sustainable water quality improvement in the lake.
Citation - WoS: 26
Citation - Scopus: 31
Impact Assessment of Different Management Scenarios on Water Quality of Porsuk River and Dam System - Turkey
(Springer, 2005) Muhammetoglu, A; Muhammetoglu, H; Oktas, S; Ozgokcen, L; Soyupak, S
Porsuk Dam Reservoir (PDR), which is located on Porsuk River, is the main drinking water resource of Eskisehir City-Turkey. Both the river and the reservoir are under the threat of several domestic and industrial point sources and land-based diffuse pollution. The river water quality is very poor with high concentrations of nitrogen and phosphorus compounds at the entrance to Porsuk Reservoir. The reservoir shows symptoms of a hypertrophic lake. The expected responses of the whole river and reservoir system under different pollution control scenarios were estimated to develop plausible water quality management strategies. The adopted scenarios assumed different levels of treatment for the major domestic point sources that include conventional treatment and tertiary treatment. The contemporary Turkish Allowable Discharge Limits (ADLs) and the best available technology choices were the investigated treatment options for the major industries. The expected improvements of water quality characteristics under the management scenario options have been estimated by means of mathematical models. The model choices were the QUAL2E for the river and BATHTUB for the reservoir. Recommendations for different levels of treatment were derived in order to improve the water quality both within the river and in the reservoir.
Citation - WoS: 3
Citation - Scopus: 3
Modeling Chlorine Decay in Drinking Water Distribution Network: Case Study of Antalya, Turkey
(Parlar Scientific Publications (p S P), 2005) Tiryakioglu, O; Muhammetoglu, A; Muhammetoglu, H; Soyupak, S
The well known hydraulic and water quality network simulation model, EPANET, is applied to the drinking water distribution network of Baris District in Antalya City, Turkey. Nine measurement and sampling stations were chosen to represent the study area. The water pressure at the pumping station was recorded during the field measurements while two different sets of water samples were analyzed in the field for chlorine residual at all the stations. Additional water samples were collected at some stations and analyzed for many physical, chemical and biological water quality parameters. Moreover, the bottle chlorine bulk decay coefficient was determined in the lab as 4.3434 day(-1). The two different field measurement sets are used to calibrate and verify the model. The calibration process resulted in a wall reaction coefficient equal to 0.025 m day(-1). In addition to predicting the chlorine residual levels along the network, the model also predicts many hydraulic characteristics such as pressure, velocity and flow rates in the network.
Citation - WoS: 11
Vulnerability of groundwater to pollution from agricultural diffuse sources: a case study
(I W A Publishing, 2002) Muhammetoglu, H; Muhammetoglu, A; Soyupak, S
Kumluca, near Antalya in Turkey, is an important plain with its intensive agricultural activities employing greenhouses. The chemical fertilizer application practices caused excessive increases of the nitrogen, phosphorus and salinity within groundwater. A study has been initiated to assess the present state of the groundwater pollution problem of Kumluca Plain. A total of nine measurement and sampling stations have been selected to represent different depths groundwater table, different types of agricultural activities and different soil types. The magnitudes of the parameters: temperature, salinity and conductivity, nitrate, nitrite, ammonia, orthophosphate and fecal coliform were determined for groundwater. Soil samples collected from the stations have been analyzed for several parameters such as texture, total salinity, total nitrogen, and total phosphorus. The measurement and analyses results of the groundwater showed wide spatial variations depending on factors such as the quality of irrigation water, depth groundwater, soil characteristics, type and age of agriculture and hydrology. Groundwater vulnerabilities to pollution have been analyzed using the SEEPAGE Model approach. Furthermore the soil, aquifer and groundwater characteristics, which will be utilized to establish "cause" and "effect" relationships in future, have been clarified.