Fieldwork

Primarily fieldwork undertaken for the DOMAINE project is undertaken for work package 1 (WP1). The WP1 primary objectives are to determine;

  • 1) The origins and rates of DOC, DON and DOP flux to aquatic ecosystems from catchment sources, relative to total C, N and P flux as they vary in time and space in relation to atmospheric inputs, catchment character, hydrological function and the extent of nutrient enrichment;
  • 2) The magnitude and character of DOC, DON and DOP instream as they vary in relation to source character, season, hydromorphology, inorganic nutrient flux behaviours, microbial activity and biological production.

In order to complete these aims we have adopted a source to sea sampling framework in both the Hampshire Avon (Figure 1) and Conwy (Figure 2) catchments, along gradients of nutrient enrichment and geochemical character, with samples collected from all potential contributing areas and then in-stream, through sampling and sensor deployment. Catchments will be monitored over a three year period (2015-2018). To achieve the aims of WP1 DOMAINE have invested in suite of in-stream monitoring equipment, provided by Wavelength Environmental including:

  • ♦ Hydrolab series 5 multi-parameter sonde for the determination of; temperature, pH, dissolved oxygen, conductivity and turbidity,
  • ♦ SUNA V2 (Submersible Ultraviolet Nitrate Analyser),
  • ♦ Wet Labs ECO single channel fluorometer for the determination of Chlorophyll-a fluorescence (an indicator of active phytoplankton biomass and chlorophyll concentrations),
  • ♦ Wet Labs ECO-CDOM single channel fluorometer for the determination of organic matter fluorescence (ex/em:370/460 nm),
  • ♦ Hach Lange SD900 portable water samplers,
  • ♦ Hach Lange FL900 area velocity flow logger.

In-situ measurements at 15 minute intervals are recorded with three monitoring stations deployed per catchment and live data streams are available to view on this website under the data tab or by clicking here. In addition to high temporal resolution in-stream monitoring, daily and weekly samples are collected and returned to the University of Bristol for analysis of total oxidised nitrogen, nitrate, nitrite, ammonium, urea, organic and particulate nitrogen, phosphorus, organic and particulate phosphorus and organic carbon concentrations. In addition further analyses are conducted including the collection of UV and fluorescence spectra.

 Figure 1. Monitoring stations across the Hampshire Avon catchment

Figure 1. Monitoring stations across the Hampshire Avon catchment

 

 

 Figure 2. Monitoring stations across the Conwy catchment

Figure 2. Monitoring stations across the Conwy catchment