Sinkholes in the city of Hamburg—New urban shear-wave reflection seismic system enables high-resolution imaging of subrosion structures

CM Krawczyk, U Polom, S Trabs, T Dahm - Journal of Applied Geophysics, 2012 - Elsevier
The investigated roof region of a salt diapir in Hamburg, northern Germany, suffers sinkhole
activity that was accompanied lately by microseismic events in the Gross Flottbek quarter …

Comparison of saturated hydraulic conductivity estimated by surface NMR and empirical equations

U Singh, PK Sharma - Journal of Hydrology, 2023 - Elsevier
This study used eight empirical equations such as Kozeny-Carman (KC), Terzaghi, Hazen,
Slitcher, Kruger, Sauerbrei, NAVFACDM7, and Zamarin to estimate saturated hydraulic …

Despiking of magnetic resonance signals in time and wavelet domains

S Costabel, M Müller‐Petke - Near Surface Geophysics, 2014 - earthdoc.org
In this paper three different despiking methods for surface‐NMR data are investigated and
compared. Two of these are applied in the time domain: a threshold is determined that …

Estimation of water retention parameters from nuclear magnetic resonance relaxation time distributions

S Costabel, U Yaramanci - Water Resources Research, 2013 - Wiley Online Library
For characterizing water flow in the vadose zone, the water retention curve (WRC) of the soil
must be known. Because conventional WRC measurements demand much time and effort in …

[HTML][HTML] Geophysical investigation of a freshwater lens on the island of Langeoog, Germany–Insights from combined HEM, TEM and MRS data

S Costabel, B Siemon, G Houben, T Günther - Journal of Applied …, 2017 - Elsevier
A multi-method geophysical survey, including helicopter-borne electromagnetics (HEM),
transient electromagnetics (TEM), and magnetic resonance sounding (MRS), was conducted …

Model-based subtraction of spikes from surface nuclear magnetic resonance data

JJ Larsen - Geophysics, 2016 - library.seg.org
Surface nuclear magnetic resonance (surface NMR) has progressed significantly in recent
years due to advances in instrumentation. In particular, the introduction of multichannel …

Forward modeling steady-state free precession in surface NMR

MP Griffiths, D Grombacher, L Liu… - … on Geoscience and …, 2022 - ieeexplore.ieee.org
In efforts to map water at depth, steady-state free precession (SSFP) sequences promise to
rapidly increase data acquisition rates in the practice of surface nuclear magnetic resonance …

Advanced aquifer characterization for optimization of managed aquifer recharge

RG Maliva, R Herrmann, K Coulibaly, W Guo - Environmental Earth …, 2015 - Springer
Managed aquifer recharge (MAR) will play an increasingly important role in solving water
scarcity. The performance of MAR systems depends primarily upon local hydrogeology …

Noninvasive estimation of water retention parameters by observing the capillary fringe with magnetic resonance sounding

S Costabel, T Günther - Vadose Zone Journal, 2014 - Wiley Online Library
The magnetic resonance sounding (MRS) method is usually applied for delineation and
characterization of aquifer system stratification. Its unique property, distinct from other …

Joint application of a statistical optimization process and empirical mode decomposition to magnetic resonance sounding noise cancelation

R Ghanati, M Fallahsafari, MK Hafizi - Journal of Applied Geophysics, 2014 - Elsevier
The signal quality of Magnetic Resonance Sounding (MRS) measurements is a crucial
criterion. The accuracy of the estimation of the signal parameters (ie E 0 and T 2⁎) strongly …