Towards a catchment to coast understanding of the transport of material between land and the coastal

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Agriculture

Beaver Reintroduction

Peatland Restoration

Managed Realignment

Seagrass

Warming, Acidification, Deoxygenation

Towards a catchment to coast understanding of the transport of material between land and the coastal sea

Andy Rees (apre@pml.ac.uk)

& Keila Guillen Onate

(kgu@pml.ac.uk)

AgZero+ Project in Tamar catchment (2022-27)
PML

2017-2018 River Tamar monthly at Gunnislake

Tamar estuary quarterly between Calstock and ~Devils Point

2019-2020

River Tamar Catchment, monthly sampling at:

Tamar - North Tamerton, Druxton, Horsebridge, Gunnislake, Saltash; Ottery -

Ham Mill Bridge; Inny - Treburly; Lyd – Lifton; Tavy – Hill Bridge, Denham Bridge; Walkham – Merrivale; Plym – Cadover

Bi-monthly sampling of estuary between Calstock and ~Devils Point

2020 – 2022

River Tamar Catchment, monthly sampling at:

Tamar - Gunnislake, Saltash, Devils Point; Tavy – Hill Bridge; Colly Brook – Peter Tavy; Walkham – Merrivale; Plym – Cadover Previous

during LOCATE project
sampling
Location River LATITUDE LONGITUDE GRID REF. OSGB HEALE BRIDGE/Boldford Carey 50.6710536 -4.316145 SX359863 TETCOTT Claw 50.74782 -4.37279 SX327969 LIFTON Lyd 50.640785 -4.279321 SX389848 NEW BRIDGE Lynher 50.487987 -4.331225 SX 347679 HAM MILL BRIDGE Ottery 50.657628 -4.3441 SX345868 DENHAM BRIDGE Tavy 50.49077 -4.148188 SX477679 N TAMERTON Tamar 50.751557 -4.385717 SX319974 GUNNISLAKE Tamar 50.52866 -4.212261 SX433723 CALSTOCK Tamar 50.49576 -4.20672 SX435685 COTEHELE Tamar 50.491229 -4.223043 SX423680 HALTON QUAY Tamar 50.467929 -4.236367 SX413655 CARGREEN Tamar 50.442684 -4.203831 SX435627 SALTASH Tamar 50.40728 -4.205775 SX433587 DEVILS POINT Tamar 50.359945 -4.167329 SX459533
sampling positions
AgZero+
Catchment – annual means
Tamar

Mean (± 1sd) nitrate at Gunnislake (2017 – 2022)

X nitrate at Gunnislake 2021

nitrate at Saltash 2021

Nitrate variability
Temperature, Salinity, Conductivity, Oxygen, Nitrate, Nitrite, Ammonium, Phosphate, Silicate, CDOM, DOC, DIC, Alkalinity, Carbon Dioxide, pH, Nitrous Oxide, Methane, Particulate Carbon, Particulate Nitrogen, Suspended Solids, Bacteria, Algae, DNA/RNA
Tamar Catchment May 2022 to August 2023
– 50 year nitrate trend
Gunnislake

Farmland – Pond & Tussock

Holding back the flow!

Upstream

Within enclosure

Upstream

Within enclosure

Incoming tide

Outgoing tide

Incoming tide

Outgoing tide

Beaver enclosure

Wetland 100µM = 1.4 mg/L – N 1.0µM = 0.031 mg/L - P
Calstock

Vis4Sea Objectives.

• The project will build a cohesive Open Data Cube to facilitate the use of in situ sampling, automated sensor network and multi-source, multi-sensor satellite data for monitoring the water quality in Plymouth Sound, UK and the Fitzeroy River, Australia.

• Optical, machine and deep learning algorithms will be applied to the satellite data to facilitate the generation of novel water quality parameters to address specific environmental case studies on the effect of sewage, agricultural and heavy metal effluent on intertidal surfaces and seagrasses.

• The output will be a freely available to stakeholders to facilitate the monitoring and management of water quality and carbon sequestration in the Plymouth Sound and Fitzeroy River catchments.

In situ samples

Integrating multi-source data to ADIAS.

Multisensor, resolution satellite data

Buoy data

Optical SPM products

Autonomous vehicles

Open data cube

Optical sensors

(mg/m 3 )
SPM

Vis4Sea ODC data.

High resolution EO data

Validation – Chl-a

CERTO MSI v2 60m

Chl-a (mg/m3), 2020-Sept-21

Validation – TSM

CERTO MSI v2 60m

TSM (g/m3), 2020-Sept-21

Trade-offs analysis between farmland and coastal zones

What?

• What are the trade-offs between farmland and coastal ecosystem services and their beneficiaries (Stakeholders)?

• How can these trade-offs change with the implementation of net zero+ innovations in farms?

Why?

• To identify winners and losers under current farming practices, and to evaluate the role of net zero+ innovative farming practices in mitigating trade-offs.

How?

• Under a participatory approach, workshops will be used to identify tradeoffs and the stakeholders’ preferences over ecosystem services being traded off among farming and coastal social-ecological systems.

Current stage

• Preparing workshops with researchers and professionals working in the Tamar Catchment.

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