For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high in the water and makes the water unclear. Therefore, the usual laser, infrared, or ultrasonic depth measurement does not doe to high sediment contents. The range of distance between where a device could be mounted and the bed is 15-30 cm. I appreciate if someone could advise me any device that could measure a short distance through sedimented water.

Thanks in advance, Mohammad

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high in the water and makes the water unclear. Therefore, the usual laser, infrared, or ultrasonic depth measurement does not doe to high sediment contents. The range of distance between where a device could be mounted and the bed is 15-30 cm. What kind of device can measure a short distance through sedimented water?