Experimental design and protocol

The general design is to:

  • before the dry period, select 2 IRES (of course, more if you can/want, there are no upper limits) you know or have been studied before (in case of braided rivers, please, contact us for adapting the protocol). If possible, prioritize the selection of the 2 IRES based on the existence of flow gauging stations nearby (within the IRES or the catchment, at a distance < 200 km) with long-term hydrological time-series available.
  • select one representative reach per IRES. The reach length will be defined as 10 times the average active channel width to ensure consistent sampling effort across IRES and to cover a representative area. The active channel is defined here as the area of inundated and exposed bed sediments between established edges of perennial, terrestrial vegetation and/or abrupt changes in slope.
  • measure the environmental variables required (details here).
  • during the dry period, collect the different CPOM type falling/growing in the dry active channel as well as biofilms/algal mats and riverbed sediments in a standardized way (details here).
  • back to the lab, process the collected material (details here).
  • ship subsamples to IRSTEA (details here).

We will then process these multiple samples consistently and contact you for associated joint publications and follow up.