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Papers by İdris Bahçeci

Turkish Journal of Agriculture and Forestry, 2008

Performance assessment (PA) of irrigation and drainage systems has been an important area of rese... more Performance assessment (PA) of irrigation and drainage systems has been an important area of research and debate in recent years. The present study was carried out to determine some performance parameters of sprinkler irrigation systems. Thirty- eight subunits (lateral) were monitored and assessed in the Konya Basin of Turkey. Sprinkler nozzle-pressure, flow rate, and their variations, and the amount of irrigation water were determined. Application and distribution uniformity, irrigation adequacy, and characteristics of system design and application were analyzed. Christensen Uniformity coefficient (CUC) and distribution uniformity (DU) values were between 41% and 88%, and between 18% and 81%, respectively. Variation in pressure and flow rates, and the use of different sprinkler parts in the same system were the main causes of the observed heterogeneity. It was concluded that by reducing lateral spacing the water distribution pattern, such as CUC and DU, could improve significantly ...

Bu calismada, Konya-Cumra Ovasindaki yuzeyalti drenaj sistemleri izlenerek drenaja neden olan faz... more Bu calismada, Konya-Cumra Ovasindaki yuzeyalti drenaj sistemleri izlenerek drenaja neden olan fazla suyun kaynaklari, dren akislari, su tablasinin duzeyi ve yil icerisindeki alcalip yukselmesi irdelenmistir. Sistemde en yuksek dren bosalimlari bugday sulama donemi olan nisan ve mayis aylarinda olmustur. Drenaja neden olan fazla suyun kaynaginin sulamalar oldugu, yagislarin dren akislarina etkisinin daha az oldugu belirlenmistir. Dren akislarinin (q a ) ortalama ve medyan degerleri 1.1-2.80 ve 0.33-2.80 mm gun -1 , arasinda degismistir. Bugday sulama doneminde dren akislari tasarimlamada ongorulen q t =3.0 mm/gun degerinden genellikle yuksek bulunmustur. Ortalama taban suyu derinlikleri 128-157 cm, medyan degerler ise 133 ve 162 cm arasinda degismistir. Asiri islakligin gostergesi olarak su tablasinin toprak yuzeyine 30 cm yukselme olasiligi %1.0-6.0, kok bolgesi olarak varsayilan 100 cm'ye yukselme olasiligi ise %20-58.5 arasinda degismistir. Drenaj siddet faktoru (α) 0.35-0.40 ...

With respect to the expansion of waterlogging and salinity increase in irrigated areas of Turkey,... more With respect to the expansion of waterlogging and salinity increase in irrigated areas of Turkey, this study was conducted to monitor and assess the effects of a subsurface drainage system on salt leaching in the Harran plain. The field experiment was carried out near Akcakale province, in Şanliurfa, from 2001 to 2004. The subsurface drainage system reduced the salinity by about 80% in the topsoil (20 cm depth), at the end of the experimental period. Winter precipitation had no significant effect on salt leaching. A statistically significant relationship was found between the amount of drainage water and the salt leaching (R2 = 0.970). An exponential relationship was further detected between drainage water (Ddw)/soil depth (Ds) vs. remaining salt/initial salt values (C/C0) (R2 = 0.764). Copyright © 2008 John Wiley & Sons, Ltd.

Irrigation and Drainage, 2008

Agricultural Water Management, 2006

Soil salinity and water logging are unavoidable processes in areas under excessive use of ground ... more Soil salinity and water logging are unavoidable processes in areas under excessive use of ground water and poor irrigation management. This study was undertaken to simulate the effect of different drain depths on the amount of drainage water, root zone salinity, and depth of water table in the Konya-Ç umra Plain, Turkey. SaltMod model was tested with data collected from the Karkın pilot area. Effects of current irrigation-drainage practices on root zone salinity and drain discharge rate were evaluated. Data such as drain discharge, soil salinity, water table depth, and soil properties were collected. The soil salinity was not high in the test area, but there were commonly high water table and high salinity in the plain. The average soil salinity in the root zone decreased from 2.90 to 2.3 dS m À1 at the end of 4 year period. Simulation results indicated that the leaching efficiency is 0.7 and natural drainage is 0.120 m/year in the test area. When drain depth is considered to be as 1.20 m, 80% of the soils would have a salinity with electrical conductivity (EC) less than 2.72 and 2.71 dS m À1 for the first and second seasons, at the end of 10 year period. The drain depth in the test area was about 1.5 m. However, the assumed depth of 1.2 m appeared to be feasible.

Agricultural Water Management, 2006

Soil salinity and water logging are unavoidable processes in areas under excessive use of ground ... more Soil salinity and water logging are unavoidable processes in areas under excessive use of ground water and poor irrigation management. This study was undertaken to simulate the effect of different drain depths on the amount of drainage water, root zone salinity, and depth of water table in the Konya-Ç umra Plain, Turkey. SaltMod model was tested with data collected from the Karkın pilot area. Effects of current irrigation-drainage practices on root zone salinity and drain discharge rate were evaluated. Data such as drain discharge, soil salinity, water table depth, and soil properties were collected. The soil salinity was not high in the test area, but there were commonly high water table and high salinity in the plain. The average soil salinity in the root zone decreased from 2.90 to 2.3 dS m À1 at the end of 4 year period. Simulation results indicated that the leaching efficiency is 0.7 and natural drainage is 0.120 m/year in the test area. When drain depth is considered to be as 1.20 m, 80% of the soils would have a salinity with electrical conductivity (EC) less than 2.72 and 2.71 dS m À1 for the first and second seasons, at the end of 10 year period. The drain depth in the test area was about 1.5 m. However, the assumed depth of 1.2 m appeared to be feasible.

Turkish Journal of Agriculture and Forestry, 2008

Performance assessment (PA) of irrigation and drainage systems has been an important area of rese... more Performance assessment (PA) of irrigation and drainage systems has been an important area of research and debate in recent years. The present study was carried out to determine some performance parameters of sprinkler irrigation systems. Thirty- eight subunits (lateral) were monitored and assessed in the Konya Basin of Turkey. Sprinkler nozzle-pressure, flow rate, and their variations, and the amount of irrigation water were determined. Application and distribution uniformity, irrigation adequacy, and characteristics of system design and application were analyzed. Christensen Uniformity coefficient (CUC) and distribution uniformity (DU) values were between 41% and 88%, and between 18% and 81%, respectively. Variation in pressure and flow rates, and the use of different sprinkler parts in the same system were the main causes of the observed heterogeneity. It was concluded that by reducing lateral spacing the water distribution pattern, such as CUC and DU, could improve significantly ...

Bu calismada, Konya-Cumra Ovasindaki yuzeyalti drenaj sistemleri izlenerek drenaja neden olan faz... more Bu calismada, Konya-Cumra Ovasindaki yuzeyalti drenaj sistemleri izlenerek drenaja neden olan fazla suyun kaynaklari, dren akislari, su tablasinin duzeyi ve yil icerisindeki alcalip yukselmesi irdelenmistir. Sistemde en yuksek dren bosalimlari bugday sulama donemi olan nisan ve mayis aylarinda olmustur. Drenaja neden olan fazla suyun kaynaginin sulamalar oldugu, yagislarin dren akislarina etkisinin daha az oldugu belirlenmistir. Dren akislarinin (q a ) ortalama ve medyan degerleri 1.1-2.80 ve 0.33-2.80 mm gun -1 , arasinda degismistir. Bugday sulama doneminde dren akislari tasarimlamada ongorulen q t =3.0 mm/gun degerinden genellikle yuksek bulunmustur. Ortalama taban suyu derinlikleri 128-157 cm, medyan degerler ise 133 ve 162 cm arasinda degismistir. Asiri islakligin gostergesi olarak su tablasinin toprak yuzeyine 30 cm yukselme olasiligi %1.0-6.0, kok bolgesi olarak varsayilan 100 cm'ye yukselme olasiligi ise %20-58.5 arasinda degismistir. Drenaj siddet faktoru (α) 0.35-0.40 ...

With respect to the expansion of waterlogging and salinity increase in irrigated areas of Turkey,... more With respect to the expansion of waterlogging and salinity increase in irrigated areas of Turkey, this study was conducted to monitor and assess the effects of a subsurface drainage system on salt leaching in the Harran plain. The field experiment was carried out near Akcakale province, in Şanliurfa, from 2001 to 2004. The subsurface drainage system reduced the salinity by about 80% in the topsoil (20 cm depth), at the end of the experimental period. Winter precipitation had no significant effect on salt leaching. A statistically significant relationship was found between the amount of drainage water and the salt leaching (R2 = 0.970). An exponential relationship was further detected between drainage water (Ddw)/soil depth (Ds) vs. remaining salt/initial salt values (C/C0) (R2 = 0.764). Copyright © 2008 John Wiley & Sons, Ltd.

Irrigation and Drainage, 2008

Agricultural Water Management, 2006

Soil salinity and water logging are unavoidable processes in areas under excessive use of ground ... more Soil salinity and water logging are unavoidable processes in areas under excessive use of ground water and poor irrigation management. This study was undertaken to simulate the effect of different drain depths on the amount of drainage water, root zone salinity, and depth of water table in the Konya-Ç umra Plain, Turkey. SaltMod model was tested with data collected from the Karkın pilot area. Effects of current irrigation-drainage practices on root zone salinity and drain discharge rate were evaluated. Data such as drain discharge, soil salinity, water table depth, and soil properties were collected. The soil salinity was not high in the test area, but there were commonly high water table and high salinity in the plain. The average soil salinity in the root zone decreased from 2.90 to 2.3 dS m À1 at the end of 4 year period. Simulation results indicated that the leaching efficiency is 0.7 and natural drainage is 0.120 m/year in the test area. When drain depth is considered to be as 1.20 m, 80% of the soils would have a salinity with electrical conductivity (EC) less than 2.72 and 2.71 dS m À1 for the first and second seasons, at the end of 10 year period. The drain depth in the test area was about 1.5 m. However, the assumed depth of 1.2 m appeared to be feasible.

Agricultural Water Management, 2006

Soil salinity and water logging are unavoidable processes in areas under excessive use of ground ... more Soil salinity and water logging are unavoidable processes in areas under excessive use of ground water and poor irrigation management. This study was undertaken to simulate the effect of different drain depths on the amount of drainage water, root zone salinity, and depth of water table in the Konya-Ç umra Plain, Turkey. SaltMod model was tested with data collected from the Karkın pilot area. Effects of current irrigation-drainage practices on root zone salinity and drain discharge rate were evaluated. Data such as drain discharge, soil salinity, water table depth, and soil properties were collected. The soil salinity was not high in the test area, but there were commonly high water table and high salinity in the plain. The average soil salinity in the root zone decreased from 2.90 to 2.3 dS m À1 at the end of 4 year period. Simulation results indicated that the leaching efficiency is 0.7 and natural drainage is 0.120 m/year in the test area. When drain depth is considered to be as 1.20 m, 80% of the soils would have a salinity with electrical conductivity (EC) less than 2.72 and 2.71 dS m À1 for the first and second seasons, at the end of 10 year period. The drain depth in the test area was about 1.5 m. However, the assumed depth of 1.2 m appeared to be feasible.