Limnogeology Laboratory

 

Field equipment

 

ETH Limnogeology

ETH Climate Geology

Eawag Sedimentology

 

 

 

 


Geophysical surveying systems

 

Data interpretation:

We use SMT Kingdom Suite software to interpret our reflection seismic data: For more infos: http://www.seismicmicro.com

 

 


Pinger

 

The 3.5 kHz pinger system is a highly mobile system offering complete digital data storage options. It is mounted on an inflatable catamaran that is usually pushed in front of the boat.  Maximum penetration amounts to ~80 m, with a vertical resolution of ~10 cm.

 

Specifications:

GeoAcoustics 3.5 kHz 4-element pinger mounted on AIRE cataraft

GeoPulse Transmitter (Model 5430A)

Octopus Marine 360 Shallow Seismic Processor

SEG-Y data storage on Exabyte tape drive

Fugawi navigation software on PC laptop

EPC 1086 graphics recorder

Honda 1 kW generator

 

Example of a 3.5 kHz seismic section... (Lago Cardiel, Patagonia)

 

 Video of Grimselsee survey campaign ...


Airgun

 

The Bolt airgun offers a high-resolution seismic system operating between the frequencies of 100-500 Hz.  It is co-owned by the Institut Forel (Univ. of Geneva) and can be used in single channel (ETH streamer) or multichannel mode (Geneva streamer).  The seismic signal can penetrate up to 300 m into the sediments with vertical resolution of ~1 m.

 

Specifications:

Bolt 1in3 airgun operated at ~70 Mpa

Coltri compressor feeding air bottle

20-element single channel GeoPulse Hydrophone (Model 5110A)

GeoPulse Receiver (Model 5210A)

Octopus Marine 360 Shallow Seismic Processor

SEG-Y data storage on Exabyte tape drive

Fugawi navigation software on PC laptop

EPC 1086 graphics recorder

Honda 1 kW generator

 

 

 

Example of a 1 cu-inch airgun seismic section... (Lago Petén-Itza, Guatemala)

 


Side scan sonar system

 

A digital dual frequency (100/325 kHz) side scan sonar system allows acoustic imaging of the lake floor.  It is operated with an automatic winch and a 300 m-long steel cable.  Processing and mosaicing software produces lake floor maps showing morphological and compositional variations.

 

Example of side scan image of a mass flow in Lake Zurich ('Oberrieder Slide')

 

 


 

 

 

 

Coring systems:

 

 

Gravity short cores

 

Gravity cores with sealing lid closure

Maximum penetration ~2 m

 

 

 

 

 

 

 

 

 

 

 

 

 


Niederreiter piston cores

 

Percussion piston coring system

3 m long sections

Maximum penetration ~20 m

 

 

 

 

 

 

 

 

 

 

 


Kullenberg piston cores

 

Kullenberg-type piston coring system

up to 500 kg lead weight

up to 15 m long sections

Hydraulic winch with 7 mm Rotex steel cable (4 t maximum pull)

 

 

 

 

 

 

 

 

 

 

 


Vibrocores

 

Vibro coring system with pressured air

Air compressor

Aluminum liners/PVC liners

Max 6 m long sections (maximum penetration ~6 m)

 

 

 

 

 

 

 

 

 Video of vibrocoring camapign on frozen Grimsel lake....


 

 

 

 

Other field equipment:

 

Several CTD instruments, Niskin Bottles, single beam echosounders

 

 

 

ETH Limnogeology

ETH Climate Geology

Eawag Sedimentology