WERA VHF and Mobile System
Examples of WERA Current Maps of the river Loire estuary near St. Nazaire, France, at High Tide of 4.5 m (left) and Low Tide of 3.0 m (right)
As WERA is modular and broadband, it can be operated at very low frequencies to provide very long ranges or at the upper HF band (30 MHz) with a resulting range of 50 km. This product family is now extended by a VHF instrument operating up to 50 MHz providing very high resolution (down to 100 m range cell size) for ranges up to 20 km.
The very high operating frequency results in short arrays:
< 20 m for 8 antenna (beam forming mode)
< 3 m for 4 antenna (direction finding mode)
It is easy to install and can be part of a rapid deployment mobile unit housed in a van or trailer.
Such a mobile station has been recently installed for 2 months in France near the river Loire estuary close to St. Nazaire. Examples of the resulting current maps measured with a pair of 12 antenna, 43 MHz WERA systems are displayed in the images above.
A pair of stations is required to provide high quality 2-D vector maps. However, even a single station can provide 2-D current vectors but with reduced spatial resolution.
Any existing WERA HF system can be modified to operate in the lower VHF band up to 50 MHz at comparably low costs.
- Ship Traffic Management in Ports and Harbours.
- Coastal Engineering Applications: land based high resolution current and wave measurements around headlands or artificial coastal features
- Environmental Management and Protection: real time monitoring of advection of pollutants, oil spills, larvae in coastal waters, enclosed basins or harbours