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Soil
Samplers for suspended sediment - Delft bottle & Arnhem type
04.31 Suspended load sampler, Delft bottle
This sampler is used to measure suspended sediment transport in rivers and other watercourses, from the surface down to 0.1 m above the river bottom. The sediment containing water flows through a bottle shaped sampler. The shape of the sampling body induces a low pressure at the rear face in such a way, that the water enters the nozzle of the sampler with almost the same velocity as the undisturbed flow. The sharp decrease of the velocity in the wide sampling chambers causes the sediment material to settle there.
04.32 Bed-load transport meter, Arnhem
This sampler is used to measure bed-load of coarse sand and fine gravel in rivers and other watercourses. The streamlined sampler is mounted in a frame and consists of a mouth followed by a basket of fine wire meshing (width of the mesh 300 mm). The sharp decrease of the velocity in the wide sampling chambers causes the sediment material to settle there. A tail fin mounted on the frame keeps the sampler in up-stream direction. The results of the measurements are influenced by the shape of the bed (ridges, dunes, flat beds, etc.). For a successful measurement knowledge of the relief of the bed is essential. The sampler can be discharged on board using the sample trough.
This sampler is used to measure suspended sediment transport in rivers and other watercourses, from the surface down to 0.1 m above the river bottom. The sediment containing water flows through a bottle shaped sampler. The shape of the sampling body induces a low pressure at the rear face in such a way, that the water enters the nozzle of the sampler with almost the same velocity as the undisturbed flow. The sharp decrease of the velocity in the wide sampling chambers causes the sediment material to settle there.
04.32 Bed-load transport meter, Arnhem
This sampler is used to measure bed-load of coarse sand and fine gravel in rivers and other watercourses. The streamlined sampler is mounted in a frame and consists of a mouth followed by a basket of fine wire meshing (width of the mesh 300 mm). The sharp decrease of the velocity in the wide sampling chambers causes the sediment material to settle there. A tail fin mounted on the frame keeps the sampler in up-stream direction. The results of the measurements are influenced by the shape of the bed (ridges, dunes, flat beds, etc.). For a successful measurement knowledge of the relief of the bed is essential. The sampler can be discharged on board using the sample trough.
