The Autonomous Survey Platform (ASP) Calypso is an inflatable, remote controlled drone that can carry a wide range of sensors for hydrographic and environmental surveys.
The ASP is easy to transport and can be installed and operated by one person. Only a Peli Case and a backpack are required for transport.
The GraviProbe is a free fall impact instrument, analyzing the underwater sediment layers during intrusion. Under its own weight it accelerates and penetrates fluid and consolidated mud layers.
The geotechnical and density conditions of the soil layers are determining the probe’s dynamical behavior. The data acquired from on-board accelerometers, inclinometers and pressure sensors is feeding a dynamical model which determines the geotechnical parameters of the intruded medium (depth, undrained shear and).
As a result the GraviProbe is able to very accurately distinguish the depth of the fluid mud and consolidated mud layers, even in gassy environments.
The high sensor data acquisition rates of up to 2kHz in combination with a low drag housing results in the highest quality profiles at drop rates over 7 m/s. Due to its light weight the probe can be operated manually from a small vessel, platform or quay and is limiting the operational costs.
The GraviProbe Rheology provides tip resistance and shear strength. The GraviProbe Soil is similar to the GraviProbe Rheology but has a conus extension to penetrate hard an stiff sediment layers.
Developed to capture high quality geotechnical profiles of fluid and consolidated mud layers at maximum depths of 5500 meter.
The Deep Sea GraviProbe is a geotechnical profiling system for deep sea waters. The system’s cone is lowered in the underwater soft layers, analysing those layers during intrusion. Under its own weight it penetrates fluid and consolidated mud or sediment layers and measuring dynamic tip resistance as a Qc value. The data acquired from the cone, on-board accelerometers, inclinometers and pressure sensors is determining the geotechnical parameters of the intruded medium (Qc over depth). The system is capable of collecting data at 5500 m depths and has a static measurement resolution of 250 Pa. Its simplicity in use results in a rapid deployment and in a high data collection rate. In a single day data of more than 100 measurement points can be collected. The instrument is complementary with classic seabed CPT's and gathers shear strength information for seabed intrusion depths from 0 to 4 meter at operational depths from 1 to 5500m.
The DensX is a high accurate in situ mud density measurement system. It measures mud densities between 1.0 T/m³ and 1.5 T/m³ with an accuracy of 0.25 %. The technology is based on X-ray and is a direct measurement method. With a sampling speed of 10 Hz the system supports fast profiling. The X-ray technology does not suffer from strong legislation restrictions like radioactive density measurement systems. The system weighs 70 kg and is able to deeply intrude in soft sediment layers.
Along with the DensX comes a user friendly software that controls a fully automated winch. The software visualizes the density profile, the winch speed, the winch torque and the tilt of the DensX. When several density profiles are taken, the software generates a mud grid and interpolated dredging volume.
Today the DensX is applied in ports and access channels to characterize mud layers, to measure density based nautical bottom criteria and to prepare and evaluate dredging works. The accurate density measurement capability allows to determine precisely the ton dry weight of dredging material.
The DensX completes dotOcean’s product portfolio of underwater sediment characterization profilers and is complementary to rheological instruments as the GraviProbe.
dotOcean is currently developing an intelligent sounding pole (NL: "intelligente peilstok"). With this manual mud or sediment profiler it is possible to analyze underwater soil layers in small waterways and rivers by manually pushing the instrument in the soil. This results in a full profile of the soft underwater layer from fluid mud to the hard bottom. The instrument can measure cone penetration resistance in fluid mud and consolidated mud.
The ICone is equipped with a Bluetooth connection for real time visualization of measured data on a ruggedized tablet (included). Connection with standard GPS devices is supported or optionally an embedded highly accurate GPS can be installed.
With the collected data it is possible to constitute an accurate planning for dredging and maintenance of small waterways.