بررسي اثرات متقابل غلظت مواد معلق در آب و نوع پوشش خاك بر ميزان نفوذپذيري حوضچه هاي نفوذ (در طرح هاي تغذيه مصنوعي )

Investigation On Variations Of Permeability Rate In Artificial Recharge Basins Due To Mixed Effects Of Different Soil Mattes And Density Of Water Suspended Particles

Clogging is one of the main disadvantages of artificial recharge projects. This situation is occurred because of high density of suspended solids in flooded water used in these projects. This paper investigates the effects of different soil mattes on infiltration rate of recharge basins. in a test site near the river Kan (north west of Tehran) 12 pools were built and variations of permeability rate for three different soil mattes (composite, gravel inverse filter and cotton wastages) with three different suspended solid densities were investigated. In the first step, it was observed that soil with gravel inverse filter had higher infiltration rate. Also, both gravel inverse filter and cotton wastages mattes showed higher permeability rate after sedimentation. In the last step, after removing 5 cm of the soil top layer, a higher infiltration rate was observed for compost mat, in comparison with the other two covers. As expected, the higher the density of suspended solids, the permeability rate was lesser.