Evaluation of selected satellite remote sensing methods for application to characterization of New Zealand aquifers

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Zemansky, G.M.; Westerhoff, R. 2013 Evaluation of selected satellite remote sensing methods for application to characterization of New Zealand aquifers. Lower Hutt, N.Z.: GNS Science. GNS Science report 2013/28 123 p.

Abstract: The work reported herein was originally funded by the Ministry for Science and Innovation (MSI), now Ministry for Business, Innovation and Employment (MBIE), as part of GNS Science’s SMART aquifer characterisation (SAC) project. This document reports on the evaluation of selected satellite remote sensing methods for potential application to characterization of aquifers in New Zealand. The following five methods were evaluated as proposed under the SAC project: 1. Application of satellite gravimetry to determine change in total water storage over time using data from the gravity recovery and climate experiment (GRACE) satellite. 2. Satellite differential synthetic aperture radar (InSAR) measurements of change in land elevation over time to determine subsidence or uplift from groundwater abstraction or recharge, respectively, in order to estimate change in groundwater storage and aquifer properties using data from various satellites. 3. Evaluation of the spatial distribution of (groundwater) rainfall recharge based on the difference between precipitation (P) and evapotranspiration (ET) estimated from satellite data (P - ET). 4. Using thermal infrared (TIR) satellite imagery to evaluate zones of groundwater inflow to streams based on stream temperature. 5. Utilisation of satellite remote sensing capability to estimate soil moisture (relevant to method three above), both as part of P-ET and by itself. (auth)