Title: Interactions between groundwater and surface water at river banks and the confluence of rivers. 
Resource Type: document --> technical publication --> journal article 
Country: EU Projects 
Year: 2004 
Availability: Journal of Hydrology 288: 312-326 
Author 1/Producer: Lambs, L. 
Author / Producer Type: EC Project 
Article Weblink (=direct link): http://www.sciencedirect.com/science?_ob=PublicationURL&_toc ...  
Format (e.g. PDF): HTML 
EUGRIS Keyword(s): Contaminated land-->Wider impacts / sustainability-->Environmental
Contaminated land-->Wider impacts / sustainability-->Sustainable / green remediation
Water resources and their management -->Stresses, quality and ecological status
Water resources and their management -->Water resources and their management Overview
Short description: The origin and mixing of water in the streamside corridor were studied in detail: the development of riparian woodland often reflects the evolution of hydrological events. River water levels and topography are the main sources of exchange between groundwater and river water through the riverbank. On the Garonne River bank field site downstream of Toulouse, the mixing of these two waters is variable, and depends mainly on the river level and the geographical position. The output of the groundwater into the river water is not diffuse on a large scale, but localised. At the confluence of two rivers, the water-mixing area is more complex because of the presence of a third source of water. In this situation, groundwater supports the hydrologic pressure of both rivers until they merge, this pressure could influence its outflow. Two cases will be presented. The first is the confluence of the Garonne and the Ariège Rivers in the south-west of France, both rivers coming from the slopes of the Pyrénées mountains. Localised groundwater outputs have been detected about 200 m before the confluence. The second case presented is the confluence of the Ganges and the Yamuna Rivers in the north of India, downstream of the city of Allahabad. These rivers are the two main tributaries of the Ganges, and both originate in the Himalayas. A strong stream of groundwater output was measured at the point of confluence. 
Link to Project(s): FLOBAR2 Floodplain Biodiversity and Restoration
Submitted By: Dr Stefan Gödeke WhoDoesWhat?      Last update: 29/06/2007