Session Programme Meeting Programme Personal Programme Search
Quick Search
Programme Groups
Great Debates
Union Symposia
Educational Symposia
Atmospheric Sciences
Climate: Past, Present, Future
Cryospheric Sciences
Energy, Resources and the Environment
Geochemistry, Mineralogy, Petrology & Volcanology
Geophysical Instrumentation
Hydrological Sciences
Magnetism, Palaeomagnetism, Rock Physics & Geomaterials
Natural Hazards
Nonlinear Processes in Geophysics
Ocean Sciences
Planetary and Solar System Sciences
Soil System Sciences
Solar-Terrestrial Sciences
Stratigraphy, Sedimentology and Palaeontology
Tectonics and Structural Geology
Medal Lectures
Key Note Lectures
Key Note Sessions
Division Business Meetings
Editorial Board Meetings
Townhall Meetings
Splinter Meetings
Union Meetings
  Information - HS39/SSS23 Dryland hydrology (co-organized by SSS) (co-listed in GM)

Event Information
In the characterisation of rivers for the EU Water Framework Directive, most of the small (10-100 km2) and some of the medium (100-1000 km2) basins in dry regions might be omitted because ephemeral or intermittent streams are considered 'not significant as water bodies for the WFD purposes' in the Provisional WFD Article 5 Report for the Jϊcar Pilot River Basin. The WFD thus would ignore approximately 30% of the area of southern Europe in assessing, managing and protecting water resources. Worldwide, over 250 million people and 100 countries suffer from degradation of soil and biodiversity in semi-arid lands, with severe consequences for water quality.

Following a successful first session in 2005, dryland hydrology remains a topic focused on improving our understanding of the distinctive hydrological processes in semi-arid areas, where Water, Sediment and Solute transfer is constrained by the absence of surface flow in the dry season, when all material is deposited on the bed or held in slow-moving subsurface waters. Because flow is less continuous than for humid areas, there are also less historic stream gauge and rainfall records for semi-arid areas, and the time required to obtain a reliable record is even longer. Coupled with storm frequency distributions that, in many areas, show more extreme behaviour in both time and space, the challenges of forecasting flash floods for both gauged and ungauged catchments is very severe.

Semi-arid areas typically have sparse vegetation cover and are consequently associated with many of the highest rates of sediment loss from the land. As the intensity of agriculture and density of population in southern Europe and other semi-arid areas continues to increase, sediment and solute loadings seem set to increase in parallel, and to accentuate existing water quality problems.

The response of dryland catchments deserves more attention from the hydrological community through the EGU. There is a less complete knowledge of semi-arid than of humid processes at all scales. Topics of particular interest within this session include:
• local runoff generation which is dominated by vertical exchanges, and by the co-evolution of vegetation and soils to create patchworks of sources and sinks
• connectivity of runoff pathways from hillslope to channel
• dynamics of channel and flood-plain exchanges within valley bottoms.
• seasonal (or rarer episodic) switches between a semi-arid and a more humid response, and the intricate dynamic of the switching transitions
• modelling dryland processes at a range of time and space scales, from long term water balance to flood, sediment and solute dynamics
• field and laboratory experimental data coupled to models for intra-bed transformation processes and first flush responses.
• implementation of sustainable catchment management for semi-arid areas.

Preliminary List of Solicited Speakers


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.

Back to Session Programme


©2002-2008 Copernicus Systems + Technology GmbH