Catalalogue de l'ORE OMERE
INRAE - GC
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Contents of trace metals in water (rain, run off, underground waters ) on the Roujan catchment area.
Regular sampling of surface water, rainwater or groundwater is carried out in the Roujan catchment area. These samples are sampled and analysed in order to assess the content of trace metals in the waters of the basin.
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The main crop is the vine. The site is strongly anthropised (network of ditches, terraced slopes, etc.). The climate is sub-humid Mediterranean with a prolonged dry season. The average annual rainfall is around 650 mm and the average annual ETP (Penman) is 1090 mm. The basic hydro-meteorological equipment, in place since May 1992, consists of a network of 9 rain gauges and 4 pluviographs, a device for measuring water table heights (14 sites), a device for measuring flows, suspended matter and pesticides at the outlets of the catchment area and of two plots with different cultivation routes and a network of 8 stations for measuring soil water content and water potential. Roujan was part of the reference catchment area network of the Network Observation Service Used for Hydrology Research created by the GIP Hydrosystème.
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Isotope analysis of groundwater, rainfall and surface water in the Roujan watershed area. Samples of rainfall accumulated over a day or an event as well as instantaneous samples of runoff and groundwater are sent to a specialized laboratory to determine their oxygen 18 and deuterium contents.
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Pesticide contents are determined on the suspended matter extracted by filtration (0,7µm) in runoff water. Contents allow quantification of particula transport of pesticides and allow too compare it to solute transport.
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Geological map of the Roujan catchment area ( 1/5000 scale), modified from the official BRGM geological map (1/50000 printed map number 1015)
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The groundwater temperature is measured at different points in the Roujan catchment. In Roujan site, the groundwater is shallow with a free surface water table rising and falling in the soil and subsoil layers. The measurements are made at different points in the catchment with piezometers. A piezometer is a perforated PVC tube at its base installed in the soil through a borehole. In every piezometer, the groundwater temperature is monitored at high frequency (~15') with autonomous and automatic temperature probe integrating acquisition units. Through the OMERE data portal accessible from this website, the data can be downloaded from an interactive map.
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The physico-chemical parameters measured in the Roujan basin and accessible via the data portal concern the measurement of elements such as pH, redox potential, temperature and conductivity, carried out during sampling in the basin.
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Water sampling in rain, runoff and undergroundwater are performed on the fields and send to a specialized laboratory to quantify major elements contents (Ca, Mg, Na, K, SO4, PO4, HCO3, NO3) ( FILTRATION ???. PH ??? ? EC, ???)