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The University of Southampton
Geography and Environmental Science

Research project: IRIS – The Integrated Rivers Instrument System - Dormant - Dormant

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Iris represents a major development in measuring key hydraulic processes within British rivers.

The IRIS frame

Iris was deployed in 2001 to measure hydraulic processes within a bedrock channel in upland England as part of a study of the turbulence and mixing processes beneath standing waves for a range of discharge conditions. Future plans for IRIS include the study of low-frequency turbulence and suspended sediment dynamics in lowland floodplain rivers.

Designed by technical staff at the Proudman Oceanographic Laboratory for river use, the Iris frame will withstand high current speeds and deployment in water of several metres depth. Readily deployed from a jib or cable Iris can also be used for estuarine or coastal studies that use research vessels with integral booms and jibs.

A single command module synchronizes the temporal sampling of the instrumentation. The synchronized instruments, logging to three ruggedised laptops, consist of:

  • two Nortek Vector ADV field flow meters, which can be raised and lowered to selected heights above the bed
  • two 2D Valeport 15cm diameter annular ECM's
  • pitch and roll sensors and pressure transducers
  • Nortek aquadopp velocity profiler
  • acoustic backscatter system (ABS) for determining profiles of suspended sediments

Additional equipment, with dedicated logging capability, includes non-invasive ultrasonic water surface sensors, a string of 16 Campbell thermistors, Scufa III submersible fluorometer with internal data logging for dye dilution surveys, additional Valeport discoidal heads, six 1D Ott ECM's configured in a vertical array and a roving Nortek Vector ADV.

Related research groups

Earth Surface Dynamics
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