EGU General Assembly 2007
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  Information - HS23 Hydrological, chemical and biological processes in rivers and riparian zones (co-listed in BG & GM)

Event Information
The hydrology and ecology of riparian zones are very much related to the broad variety of processes at the interface between terrestrial and aquatic systems. The hydrological and hydro-chemical dynamics in riparian zones and floodplains can be strongly determined by complex interactions between surface waters and the groundwater. Exchange fluxes between groundwater and surface waters often control the floodplain water balance and river discharge as well as the composition of nutrients and pollutions in both groundwater and surface waters. These fluxes can therefore have an important impact on the chemical and ecological status of connected freshwater ecosystems. Due to its own natural nutrient attenuation capacity many riparian zones represent buffer strips of high ecological importance. However, in some cases they may also act as sources of nutrient pollution.
The physical and chemical streambed characteristics have a strong impact on the transport of water and chemicals along the groundwater surface water interface in freshwater ecosystems. Metabolism of redox sensitive elements and natural attenuation processes within the mixing zone of groundwater and surface waters can be significant for stream and groundwater chemical conditions and thus also for the surface water and groundwater quality and ecological status.

Substantial research has been done in the last years in order to investigate the spatial and temporal pattern of exchange processes and dynamics, the natural regulation functions of floodplains due to retention and natural attenuation of nutrients and pollutants.

This session solicits papers with a focus on the application of:

i) innovative experimental methods for the investigation of the temporal and spatial pattern of the physical streambed and floodplain properties and its implications for the exchange fluxes between groundwater and surface waters as well for the floodplain hydro-dynamics
ii) studies investigating the role of groundwater surface water exchanges for the retention and natural attenuation functions of nutrients and pollutants within the surface water, the streambed and the floodplain
iii) advanced and novel model developments and applications taking into account the impact of groundwater surface water interactions on floodplain water balance, river discharge and (ground)water chemistry
iv) impact studies focussing on the importance of groundwater surface water interactions for floodplain and surface water ecology
v) integrative approaches which try to generalise and upscale local knowledge about the implications of groundwater surface water interactions and incorporate this knowledge into management and risk assessment frameworks in regard to the European Water Framework Directive.

Preliminary List of Solicited Speakers
Roy Haggerty (Dept. of Geosciences, Oregon State University, US)
Chris Soulsby & Iain Malcolm (Dep. of Geography and Environment, University of Aberdeen, UK; FRS Freshwater Laboratory, Faskally, Pitlochry, UK)
J.S. Richardson (University of British Columbia, Department of Forest Sciences, Vancouver, BC, Canada)

Co-Sponsorship

General Statement
The information contained hereafter has been compiled and uploaded by the Session Organizers via the "Organizer Session Form". The Session Organizers have therefore the sole responsibility that this information is true and accurate at the date of publication, and the conference organizer cannot accept any legal responsibility for any errors or omissions that may be made, and he makes no warranty, expressed or implied, with regard to the material published.



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