Silt Probe – High Resolution Sediment Profiler (HRSP)
Sediments beginning with a density of 1.2 g/cm³ are generally deemed a navigation hindrance and are therefore removed. In dredging territories that have a lot of silt accumulation, so-called nautical bottom cannot always be detected due to ‘fluid mud’ that is above the nautical bottom. Fluid mud is navigable for ships and because of this, must not be dredged. The HRSP can prove which of the dense horizons is appropriately measured and how much of the additional nautical depth contains fluid mud. As solid mud can become liquid via sediment conditioning, the sediment profiler can contribute to an effective monitoring of sediment conditioning methods, thereby allowing opportunity to examine successful/ unsuccessful practices. The complete water column and all of the silt horizons are fed through vertically and are scanned with the ultrasound to analyze and determine the density and the rheological yield stress. Its high sampling rate enables a spatial measurement resolution, so that the very thin silt/mud deposits can be tracked and measured. This is, for example, very important here where the dredging activities stir up contaminated sediment and drift it away. Echosounder makes analyzing the dispersion and amount of this ‘fluffy‘ dredging residual not possible.