When it comes to collecting sediments from lakes its all about having the right tools for the job. Working in remote areas of the tropics we tend to favour the Colinvaux-Vohnout corer; supplied by Vince Vohnout at Geo-core). The advantages of this system are:
- its light-weight nature (can be backpacked or donkeyed into field sites), and
- the cam system (which allows hammering to penetrate tough sediments).
With the right platform (two banana boats and an A-frame) we have manged to retrive c. 20 m of sediment from 20 m of water (c. 40 m of drill rod extended); Lake Pacucha, Peru (Hillyer et al., 2009). More typically we use two Avon Redstart inflatables and a platform following the design of Colinvaux et al. (1999).
Recent debate on the International Paleolimnology Association list server saw recommendations for a number of other systems.
I would be interested if anyone has any thoughts on the relative merits of these systems (or others) and there capabilities.
Photos and references below: