الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 93 |  |  |
| | | from | 93 | | |
Abstract
Physical clogging of porous media plays an important role in controlling their hydraulic conductivity. This study investigates how uniformly graded medium-to-coarse sand in a reservoir’s bed performs in response to the inflow of turbid water with fine suspended sediments. Different particle sizes, water pressure heads, and sediment concentrations were experimentally simulated to cover a range of hydrologic conditions. A 1-D sand column was used with three-bed material sizes and three suspended particle sizes. Seven particle size ratios, four water pressure heads and three suspended sediment concentrations were tested. It was concluded that the relative hydraulic conductivity of the bed material decreases with the decrease of the ratio of sediments-to-bed particle sizes. Increasing the concentration of suspended sediments accelerates the rate of clogging, while bigger water pressure heads increase the depth of clogging. The study highlights how physical clogging affects the water balance in surface reservoirs, the groundwater recharge process using different recharge techniques (spreading methods using recharge basins and injection wells in vadose zone or directly into aquifers), and majority of on-farm irrigation methods where water is applied to the root zone from ground surface.