This project considers issues of connectivity in relation to sediment transport in fluvial systems, with a particular focus on networks containing bedrock-alluvial channels. A key aspect of this project will be consideration of what forms the fundamental units of a network, and how this can be considered across different scales. The network units that will be investigated are sediment grains, channel bars, exposed bedrock and river reaches. The key question is to what extent an understanding of the structure of these units is necessary to understand sediment fluxes at larger scales. The project will use both field data and numerical modelling. A range of field techniques (e.g. terrestrial laser scanning, structure-from-motion) will be used to collect nested datasets to quantify the structure of these units within one or more UK or international river networks. Field monitoring will also be undertaken to establish sediment mobility within these units. Numerical modelling of network-scale sediment fluxes with varying levels of process representation will be undertaken to address the identified objectives.