The effect of water storages on temporal gravity measurements and the benefits for hydrology [Elektronische Ressource] / by Noah Angelo Benjamin Creutzfeldt

Benjamin Creutzfeldt

Informations

• Publié par: universitat_potsdam
• Publié le: 01 janvier 2010
• Nombre de lectures: 35
• Langue: English
• Poids de l'ouvrage: 14 Mo

Extrait

The effect of water storages
on temporal gravity measurements
and the benefits for hydrology
Benjamin CreutzfeldtInstitute of Earth and Environmental Sciences
The effect of water storages
on temporal gravity measurements
and the benefits for hydrology
Cumulative dissertation
for the degree of
Doctor of Natural Sciences (Dr. rer. nat.)
in Geoecology
submitted to the
Faculty of Mathematics and Natural Sciences
at the University of Potsdam, Germany
by
Noah Angelo Benjamin
Creutzfeldt
Referees:
Bruno Merz, University of Potsdam, Germany
Michel Van Camp, Royal Observatory of Belgium, Belgium
Markus Weiler, Albert-Ludwigs-University of Freiburg, Germany
Submitted: April 2010
Defended: October 2010
Published: Novemver 20010






















































Published online at the
Institutional Repository of the University of Potsdam:
URL http://opus.kobv.de/ubp/volltexte/2010/4857/
URN urn:nbn:de:kobv:517-opus-48575
http://nbn-resolving.org/urn:nbn:de:kobv:517-opus-48575 V
Contents V
List of figures VII
List of tables IX
Abstract XI
Zusammenfassung XII
Acknowledgement XIII
Chapter 1: Introduction, motivation
and objective 1
1.1 Geophysical importance 3
1.2 Hydrological importance 3
1.3 Gravity and the relation to hydrology 4
1.4 Objective 6
1.5 Tasks and structure 6
Chapter 2: Simulating the influence of water storage changes on the superconducting
gravimeter of the Geodetic Observatory Wettzell, Germany. 7
2.1 Introduction 10
2.2 Study area 11
2.3 Method 11
2.4 Results and discussion 14
2.5 Conclusions 20
Chapter 3: Measuring the effect of local water storage changes on in-situ gravity
observations: Case study of the Geodetic Observatory Wettzell, Germany 21
3.1 Introduction 24
3.2 Study area 25
3.3 Snow storage 27
3.4 Top soil and soil storage 27
3.5 Groundwater storage 29
3.6 Saprolite storage 30
3.6.1 Deep percolation 303.6.2 Groundwater recharge 323.6.3 Water storage change in the saprolite zone 33
3.7 Gravity and water storage change 33
3.7.1 SG residuals 333.7.2 Gravity response 343.7.3 Comparison of gravity response and SG residuals 35
3.8 Discussion 37
3.9 Conclusions 38
Chapter 4: Reducing local hydrology from high precision gravity
measurements: A lysimeter-based approach 41
4.1 Introduction 44
4.2 Data and method 44VI CONTENTS
4.2.1 Data 444.2.2 Lysimeter-based approach 464.2.3 Other approaches for comparison 47
4.2.4 Large-scale hydrological gravity effect 47
4.3 Results and discussion 484.3.1 Lysimeter-based approach 48
4.3.2 Comparison to other approaches 484.3.3 Comparison to the large-scale hydrological gravity effect 51
4.4 Conclusions 52
Chapter 5: The benefits of gravimeter observations for modelling
water storage changes at the field scale 55
5.1 Introduction 58
5.2 Study area and data 59
5.2.1 Study area 595.2.2 Gravity data 595.2.3 Meteorological data 60
5.2.4 Hydrological / water storage data 61
5.3 Hydrological modelling 615.3.1 Model structure 61
5.3.2 Gravity response 635.3.3 Assessment of model performance 63
5.4 Results and discussion 64
5.4.1 Model evaluation 645.4.2 Model validation 665.4.3 Water storage changes 68
5.5 Conclusions 68
Chapter 6: Discussion, conclusions
and outlook 71
6.1 Summary of achievements 73
6.2 Discussion and directions of further research 74
6.2.1 Simulating the gravity signal 746.2.2 Gravity measurements for hydrology 746.2.3 The near field problem 75
6.2.4 Transferability to other gravity measurement sites 756.2.5 Spatiotemporal variability of water storages 766.2.6 Hydrological modeling and temporal gravity data 77
6.3 Concluding outlook 78
6.4 Conclusion 78
References 79VII
List of figures
Figure 1.1: Geophysical phenomena and the related processes which cause variations of the Earth’s
gravity field at a range of characteristic space-time scales. 3
Figure 1.2: Terrestrial water cycle with main water storages and hydrological processes. 4
Figure 1.3: Objective and structure of the study