Tidal marshes are valuable coastal ecosystems that are threatened by global climate warming and the resulting sea level rise. Whether they drown or continue to exist, depends on the trapping of sediments that builds up the land surface. Tidal channel networks, which typically occur within tidal marshes, are the major supply routes for sediments towards the marshes and hence are expected to affect the capacity of marshes to keep up with sea level rise by sediment trapping. The development and evolution of tidal channel networks and the sediment trapping are locally determined by so-called bio-geomorphic interactions between plants, water flow and sediment transport. However, the effect of different environmental variables on channel network formation remains poorly understood. In this research, we investigated the impact of spatio-temporal plant colonization patterns by means of flume experiments. Four scaled landscape scale experiments were conducted in the Metronome tidal facility, a unique flume that tilts periodically to generate tidal currents. Two control experiments without vegetation, a third experiment with a channel-fringing vegetation colonization pattern, and a fourth with patchy vegetation colonization pattern. Seeds were distributed by water in the channel-fringing experiment, while a manual sowing method was used to obtain laterally expanding circular patches in the patchy experiment. Our results show that vegetation and their respective colonization pattern affect channel network formation both on a landscape scale and local scale. More extensive and effective channel networks are found in vegetation experiments. These results indicate that channel-fringing or patchy recruitment strategies might produce landscapes that are more resilient to sea level rise.
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RBINS Staff Publications 2024
he 2016 Arctic Observing Summit Conference Statement (www.arcticobservingsummit.org) confirms the need for continued development of a globally connected data and information system of systems. Following on developments during the IPY and further evolved over a series of workshops and publications, the polar data community has been working together towards practical, useful, stable, and interoperable infrastructures to support Arctic research and communities. The Arctic community identified interoperability as a foundational goal and theme. Interoperability can be defined as properties of data and information systems that allow them to connect to, and share with, other information products or systems in the present or future without unintended restrictions. However, interoperability is far more than an exercise in engineering. A truly interoperable, globally connected polar data system is a socio-technical system that crosses many scales and knowledge domains. Although developing an interoperable system is complex and challenging, significant progress is being made. In November of 2016, 60 representatives from 17 countries and more than 15 polar data organizations and initiatives participated in the Polar Connections Interoperability Workshop. Based on a pre-workshop analysis and survey, several themes were used to organize the meeting activities: Data discovery and services. Representing Indigenous Knowledge, Community Based Monitoring, and the social sciences. Virtual Research Environments and Cloud computing. Governance and sustainability. Capacity building (cross-cutting). During the workshop, participants. Recognized that many remaining challenges are social rather than technical, such as supporting human networks, promoting standards, and aligning policy with implementation; Confirmed the need for interoperable, federated data discovery and identified existing systems to address this need; Identified key data services and models in support of priority goals; Enhanced models for engaging Indigenous people(s); Initiated connections to global data and information communities for broader interoperability and engagement, including RDA, ESA, and others. We conclude by summarizing outcomes to date, benefits to researchers and communities and proposing next steps.
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RBINS Staff Publications 2017
