Between August 2026 and January 2027 we're measuring greenhouse gas (N2O and CO2) emissions from the dry gravel bars in braided rivers. 

Why? If gravel bars do emit these gases they are likely to comprise a significant portion of the whole-river emissions footprint because gravel bars make up the majority of braided rivers surface area. We need to figure out if, and how much, gravel bars are emitting greenhouse gases so that we can identify any climate feedback loops that might be created by changing flows, channel structures, vegetation, and temperatures.  

How? By burying special gas permeable tubing at different depths under the gravel. Once the samplers are installed any CO2 or N2O in the gravel will slowly diffuse into our samplers. We'll then be able to come back periodically to measure what's accumulated in our samplers. We have installed up to 16 samplers in eight of Canterbury's braided rivers. So if you come across any of our site markers please just leave them where they are! But if you notice a potential issue with our samplers - or would like any more information about our research - please don't hesitate to get in touch.