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Inverse modeling of interbed storage parameters using land subsidence observations, Antelope Valley, California

Hoffmann, J. und Galloway, D. L. und Zebker, H. A. (2003) Inverse modeling of interbed storage parameters using land subsidence observations, Antelope Valley, California. In: Eos Trans. AGU, 84(46), Fall Meeting Suppl.. AGU Fall Meeting, San Francisco, December 1-5, 2003.

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Kurzfassung

Land subsidence above subsurface reservoirs has been observed in many locations all over the world. The observed surface displacements accompany reservoir pressure changes induced by the resource exploitation or management. In recent years satellite radar interferometry (InSAR) has increasingly complemented or replaced traditional methods for detecting and characterizing the surface displacement field above reservoirs. We have used land-subsidence observations from repeatedly surveyed benchmarks and InSAR in Antelope Valley, Mojave Desert, California to estimate interbed storage parameters controlling the subsidence in a previously calibrated regional ground-water flow and subsidence model (MODFLOW). Using the non-linear parameter estimation program UCODE, we have estimated compaction time constants varying spatially from $3.8$ to $285$ years. A linear estimation of the inelastic skeletal storage coefficients yielded values between $0$ and $0.09$. We found that subsidence observations over long time periods were necessary to constrain the large compaction time constants in Antelope Valley. Because historical subsidence data cannot yet be provided by space-geodetic techniques such as InSAR the time-constant estimates in our model were constrained primarily by observations from benchmarks. Incorporating the resulting parameter estimates into the MODFLOW ground-water flow and subsidence model significantly improved the agreement between simulated and observed subsidence, whereas the model-simulated aquifer heads proved to be very insensitive to our modifications of the interbed storage parameters. Both the accuracy of the estimated parameters and the resulting models' ability to predict subsidence over short time periods is hampered by the fact that the simulated hydraulic heads are often not representative of the actual aquifer hydraulic heads. These errors constitute the primary limitation of the approach presented here.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2004, monograph_id=Abstract G41A-05,
Titel:Inverse modeling of interbed storage parameters using land subsidence observations, Antelope Valley, California
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hoffmann, J.NICHT SPEZIFIZIERT
Galloway, D. L.NICHT SPEZIFIZIERT
Zebker, H. A.NICHT SPEZIFIZIERT
Datum:2003
Erschienen in:Eos Trans. AGU, 84(46), Fall Meeting Suppl.
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
American Geophysical Union, NICHT SPEZIFIZIERT
Status:veröffentlicht
Stichwörter:aquifer system compaction, InSAR
Veranstaltungstitel:AGU Fall Meeting, San Francisco, December 1-5, 2003
Veranstalter :American Geophysical Union
HGF - Forschungsbereich:keine Zuordnung
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:keine Zuordnung
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:06 Jan 2010 12:21

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