Suspended sediment is a natural part of river systems and plays an essential role in structuring the landscape, creating ecological habitats and transporting nutrients. It is also a common management problem, where alterations to sediment quantity and quality negatively impact ecological communities, increase flood hazard and shorten the lifespan of infrastructure. To address these challenges and develop appropriate sustainable management strategies, we need a thorough understanding of sediment sources, pathways and transport dynamics and the drivers that underlie spatial and temporal variability in suspended sediment transport in rivers. However, research to date has not sufficiently addressed the temporal complexity of sediment transport processes, which is limiting our ability to disentangle the hydro-meteorological, catchment, channel and anthropogenic drivers of suspended sediment transport in rivers. This review critically evaluates previously published work on suspended sediment dynamics to demonstrate how the interpretation of sediment sources and pathways is influenced by the temporal scale and methodology of the study. To do this, the review (i) summarizes the main drivers of temporal variation in suspended sediment transport in rivers; (ii) critically reviews the common empirical approaches used to analyze and quantify sediment sources and loads, and their capacity to account for temporal variations; (iii) applies these findings to recent case studies to illustrate how method and timescale affect the interpretation of suspended sediment transport dynamics; and finally (iv) synthesizes the findings of the review into a set of guidelines for a multi-timescale approach to sediment regime characterization. By recognizing a priori that study design and temporal scale have an impact on the interpretation of SS dynamics and employing methods that address these issues, future research will be better able to identify the drivers of suspended sediment transport in rivers, improve sediment transport modelling, and propose effective, sustainable solutions to sediment management problems

Preliminary results of the UK Urban Flood Resilience research consortium are presented and discussed, with the work being conducted against a background of future uncertainties with respect to changing climate and increasing urbanization. Adopting a whole systems approach, key themes include developing adaptive approaches for flexible engineering design of coupled grey and blue-green flood management assets; exploiting the resource potential of urban stormwater through rainwater harvesting, urban metabolism modelling and interoperability; and investigating the interactions between planners, developers, engineers and communities at multiple scales in managing flood risk. The work is producing new modelling tools and an extensive evidence base to support the case for multifunctional infrastructure that delivers multiple, environmental, societal and economic benefits, while enhancing urban flood resilience by bringing stormwater management and green infrastructure together.

Urban flood management is increasingly expected to be multifunctional to integrate with the existing functioning of cities. Locally, this led to the development of sustainable urban water drainage designs, while at larger scales, blue‐green or water‐sensitive cities are considered as examples for how cities should function. Upscaling local designs to city‐scale flood resilience is not straightforward, however, due to the complexity of physical infrastructure and socio‐economic interactions within urban systems and requires “system‐of‐systems” thinking. To this end, we introduce the concept “interoperability” to guide transition from local multifunctionality to city‐scale multisystem flood management, through actively managing connections between infrastructure systems to convey, divert, and store flood water. While flood management is already based on these connections, interoperability is about explicitly emphasising them to explore and create opportunities to facilitate the integration of systems for flood management. The main research need arising from this conceptualisation is to determine how spatial data on infrastructure, environment, and social characteristics in urban areas can serve as a basis to identify opportunities and barriers for interoperability. By introducing interoperability and the research needs arising from it, a framework is created to facilitate and encourage practical thinking and discussion about system integration in urban flood management.