OZCAR-RI H+ PLOEMEUR - GUIDEL CZO - France

Basic Information
Site Name
OZCAR-RI H+ PLOEMEUR - GUIDEL CZO
Short name
H+_PL
Country
France
Site Manager
Keywords
Abiotic Heterogeneity
Anthropogenic pressure
aquatic ecosystems
climate change
evapotranspiration
fractured media
groundwater
groundwater chemical tracing
groundwater flow
hydrogeophysics
reactivity
Site Description
The Ploemeur-Guidel observatory (Britanny, France) is focusing on surface-depth relationships in a fractured crystalline geological context and oceanic climate. It is built on 2 sub-sites, one highly anthropized, the other in natural state. In Ploemeur, groundwater has been pumped since 1991, supplying more than 1 million m3 of clean drinking water annual at a sustainable rate. Such high productivity is explained the specific fractured network in granite and micaschists, draining deep geological layers (~400 m). Extracted water quality is very good, with limited nitrate concentration, in a region that has been strongly affected by widespread pollution. Guidel site is in a similar, but natural context. Deep iron-rich groundwater is upflowing, creating surface and deep groundwater-dependent ecosystems, and feeding a classified coastal wetland. Both sites have a very dense equipment to study rapid to long-term surface-depth exchanges: a flux tower, unsaturated zone monitoring, a network of ~50 shallow (<10m) and deep boreholes (>80m), hydrochemical, temperature and deformation. An well-characterized fractured experimental site offers the possibility to conduct experiments to test innovative instruments and develop new methodologies
Last modified
2020-06-29 10:06:46
General Characteristics, Purpose, History
Site Status
Operational
Year Established
1991
Purpose
Ploemeur combines both monitoring and experimental objectives: (1) Develop innovative methods for imaging subsurface structure and flow in highly heterogeneous environments; (2) Investigate the aquifer vulnerability to climatic and anthropogenic pressures: (3) Study the environment’s chemical reactivity, and water quality as extraction proceeds; (4) Estime water residence time and travel time distributions; (5) Acquire the data necessary for testing and validating hydrogeologic modeling methods designed for fractured environments. Close interactions are maintained with the local water development board
Parameters
Photos
Ploemeur - pumped site

Ploemeur - pumped site

Guidel - iron-rich groundwater river mix to a surface water river

Guidel - iron-rich groundwater river mix to a surface water river

Tracing experiment (conservative, reactive, dissolved gazes)

Tracing experiment (conservative, reactive, dissolved gazes)

Granite outcrop on the sea shore - dense fracture network

Granite outcrop on the sea shore - dense fracture network

Natura 2000 lake directly fed by groundwater inflow

Natura 2000 lake directly fed by groundwater inflow

Stang Er Brunn - Experimental setup

Stang Er Brunn - Experimental setup

Large-scale geological model

Large-scale geological model

Geographic
Size
5000.00ha
Elevation (average)
20.00msl
Elevation (min)
0.00msl
Elevation (max)
60.00msl
Affiliation and Network Specific Information
Affiliation
ILTERThis site is a verified "ILTER" member.
LTER EuropeThis site is a verified "LTER Europe" member.
LTER France (CZO_EU_FR_204)This site is a verified "LTER France" member.
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