Field site monitoring

Overview of monitoring approach in riparian zones

The field site monitoring approach will cover a wide range of physical and chemical processes within the soil-water interface. 

Each river scale has one temporal monitoring site and a further two one-off characterisation sites.

Field sites structure

Temporal monitoring is by:

  • Water table and temperature – Pressure transducers record water height (60 mins) above the base of the shallow borehole (set to chart datum a.s.l.), air and soil water temperature. 
  • Soil moisture - 1 m depth profile locations of soil moisture (monthly) using Delta-T survey probes via permanent access tubes, relating to initiation of soil water flows via soil hydraulic calibrations. 
  • River water height - Pressure transducer stage height (15 mins) for relating hydraulic gradients (hillslope-riparian-channel) and river flow through a rating relationship. 
  • Monthly soil solution – Suction cup lysimeters operated by vacuum pump are installed at three different depths at each of the groundwater sensors. 
  • Monthly river water samples – For nutrient analyses to compare with soils, characterise stream conditions and generate hydrochemical fluxes.
  • Redox/pH –  Installation of redox electrodes used to determine pH/Eh, as well as in-situ use of direct indicators of redox effects in soil profiles using IRIS oxides Fe and Mn coated paper films. 
Field sites monitoring
Conceptual representation of how types of field monitoring data is brought together to understand the soil physical and chemical conditions control nutrient solubility and potential for riparian zones to influence river exports.