Group on Earth Observation (GEO) Group on Earth Observation (GEO) Proposal:Proposal:

GNSS and InSAR for (Ground) Water GNSS and InSAR for (Ground) Water Resource Development and Drought Resource Development and Drought

MitigationMitigation

IGCP 565 Workshop 4, WITS, South Africa, 21 – 22 Nov 2011

A Mlisa and C Hartnady

Umvoto Africa, Cape Town, South Africawww.umvoto.com

To demonstrate the use of high-precision GNSS technology as a tool for groundwater resource monitoring and assessment

To demonstrate the use of high resolution radar satellite (SAR) imagery as a tool for groundwater resource monitoring and assessment

To develop the methodology for relating SAR image interpretation and GNSS measurements of natural or abstraction-induced surface deformation and conjunctive hydrogeological data in order to derive the in-situ, bulk elastic properties (e.g., skeletal compressibility) of an underlying confined fractured-rock aquifer

To build South African capacity to establish the technical infrastructure (e.g., telemetry systems) and implement the data-processing methods required for a pilot GNSS-for-Groundwater scheme

Access to radar imagery covering Oudtshoorn (DAGEOS) project area

Provision of approximately six new geodetic GPS receivers

Support for training and capacity building on GPS and radar data processing (e.g., GAMIT/GLOBK)

Funding for human resource and operational costs, Estimated total cost Euro 1 540 874 for a period of 3

years

Swartberg RangeSwartberg Range

Outeniqua RangeOuteniqua Range

Little KarooLittle Karoo

DAGEOS study areaDAGEOS study area

CAGE study areaCAGE study area

CoCT study areaCoCT study area

Overstrand study areaOverstrand study area

OudtshoornOudtshoorn

OudtshoornOudtshoornBlossomsBlossoms

15 km15 km

Hot springHot spring

Hot springHot spring

“To explore and quantify the deep artesian groundwater resource potential in the confined

fractured-rock aquifers of the Table Mountain Group (TMG) within a water stressed catchment through

the integrated application and further enhancement of structural-geological and

remote-sensing/geophysical methods”

(after Coetzee & Haelbich, 1983)

Artesian free-flow test Artesian free-flow test (July 2008)(July 2008)

Layflat hose with discharge in furrow ~5 m above wellhead

Monitoring SitesMonitoring Sites

~15 km~15 km

SAB Miller hops farmsSAB Miller hops farms

BlossomsBlossoms

GZ335GZ335

GZ337GZ337 DB7DB7

• 2 x cGPS receivers• 2 x field geodetic GPS

receivers• Gravity benchmark

campaigns• GPS levelling surveys

THANK YOU