Evaluating Subsurface Parameterization to Simulate Hyporheic Exchange: The Steinlach River Test Site

Ground Water ◽  
2019 ◽  
Vol 58 (1) ◽  
pp. 93-109 ◽  
Author(s):  
Reynold Chow ◽  
Jeremy Bennett ◽  
Jürnjakob Dugge ◽  
Thomas Wöhling ◽  
Wolfgang Nowak
Keyword(s):  
Test Site ◽  
Hyporheic Exchange ◽  
River Test

Sensitivity of Simulated Hyporheic Exchange to River Bathymetry: The Steinlach River Test Site

Ground Water ◽  
2018 ◽  
Vol 57 (3) ◽  
pp. 378-391 ◽  
Author(s):  
Reynold Chow ◽  
Hao Wu ◽  
Jeremy P. Bennett ◽  
Jürnjakob Dugge ◽  
Thomas Wöhling ◽  
...  
Keyword(s):  
Test Site ◽  
Hyporheic Exchange ◽  
River Test

A lithospheric velocity anomaly beneath the Shagan river Test Site. Part 2. Imaging and inversion with amplitude transmission tomography

1992 ◽  
Vol 82 (2) ◽  
pp. 999-1017
Author(s):  
K. L. McLaughlin ◽  
J. R. Murphy ◽  
B. W. Barker
Keyword(s):  
Fourier Transforms ◽  
Test Site ◽  
Small Scale ◽  
Projection Operators ◽  
Order Partial Differential Equation ◽  
Linear Inversion ◽  
Discrete Fourier Transforms ◽  
Velocity Anomaly ◽  
Inversion Procedure ◽  
River Test

Abstract A linear inversion procedure is introduced that images weak velocity anomalies using amplitudes of transmitted seismic waves. Using projection operators from geometrical ray theory, an image of an anomaly is constructed from amplitudes recorded at arrays of receivers using arrays of sources. The image is related to the velocity anomaly by a second-order partial-differential equation that is inverted using 2-D discrete Fourier transforms. As an example of the inversion procedure, magnitude residuals for European stations recording Shagan River explosions are used to image the deep lithospheric anomaly beneath the Shagan River test site described in Part 1. This formal inversion analysis confirms the existence of a small-scale lateral heterogeneity located 50 km west-northwest of the test site at a probable depth between 80 and 100 km and indicates that it is consistent with a deterministic 1.5% peak-to-peak (or 0.5% rms) velocity anomaly with a scale length of about 3 km. 3-D dynamic raytracing is then used to verify that the inferred laterally varying structure produces amplitude fluctuations consistent with observations.

Shallow Velocity Structure at the Shagan River Test Site in Kazakhstan

2001 ◽  
Vol 158 (11) ◽  
pp. 2017-2039 ◽  
Author(s):  
J. L. Bonner ◽  
D. C. Pearson ◽  
W. S. Phillips ◽  
S. R. Taylor
Keyword(s):  
Velocity Structure ◽  
Test Site ◽  
Shallow Velocity Structure ◽  
River Test

Assessing hyporheic exchange and associated travel times by hydraulic, chemical, and isotopic monitoring at the Steinlach Test Site, Germany

2013 ◽  
Vol 69 (2) ◽  
pp. 359-372 ◽  
Author(s):  
Karsten Osenbrück ◽  
Thomas Wöhling ◽  
Dennis Lemke ◽  
Nina Rohrbach ◽  
Marc Schwientek ◽  
...  
Keyword(s):  
Test Site ◽  
Hyporheic Exchange ◽  
Travel Times

A lithospheric velocity anomaly beneath the Shagan river test site. Part 1. Detection and location with network magnitude residuals

1992 ◽  
Vol 82 (2) ◽  
pp. 980-998
Author(s):  
B. W. Barker ◽  
J. R. Murphy
Keyword(s):  
Test Site ◽  
P Wave ◽  
Depth Range ◽  
Back Projection ◽  
Lateral Variation ◽  
Velocity Anomaly ◽  
Large Samples ◽  
P Wave Velocity ◽  
Close Proximity ◽  
River Test

Abstract Large samples of teleseismic P-wave data recorded from Shagan River under-ground explosions have been systematically analyzed in an attempt to understand the causes of mb variability observed for these explosions. Results of these analyses indicate that large (>0.5 magnitude unit) differences in station-corrected mb residuals between explosions in close proximity are associated with changes in the near-source P-wave propagation paths to teleseismic distances. Back projection of the mb residuals from seismic stations in continental Europe into the P-wave initiation area near the source reveals the existence of an anomalous volume of material located about 50 km northwest of the test site, apparently at a depth of about 100 km. This anomalous volume defocuses energy out of paths to certain stations and redirects this energy into the paths to other stations and is associated with no detectable travel-time anomaly. This anomalous volume most likely corresponds to some relatively sharp lateral variation in physical properties, in particular P-wave velocity, at this depth. The estimated lateral dimension of the anomaly is only on the order of 5 km, which would make it one of the smallest deterministic features ever isolated at this depth range.

Magnitude Estimation and Cross-Modal Matching of Lingual Vibrotactile and Auditory Sensation

1989 ◽  
Vol 32 (3) ◽  
pp. 698-702 ◽  
Author(s):  
Daniel Harris ◽  
Donald Fucci ◽  
Linda Petrosino
Keyword(s):  
Auditory Stimulus ◽  
Magnitude Estimation ◽  
Sensory Processing ◽  
Test Site ◽  
Systematic Investigation ◽  
Thenar Eminence ◽  
Stimulus Range ◽  
Psychophysical Scaling ◽  
Scaling Methods ◽  
Response Biases

The present experiment was a preliminary attempt to use the psychophysical scaling methods of magnitude estimation and cross-modal matching to investigate suprathreshold judgments of lingual vibrotactile and auditory sensation magnitudes for 20 normal young adult subjects. A 250-Hz lingual vibrotactile stimulus and a 1000-Hz binaural auditory stimulus were employed. To obtain judgments for nonoral vibrotactile sensory magnitudes, the thenar eminence of the hand was also employed as a test site for 5 additional subjects. Eight stimulus intensities were presented during all experimental tasks. The results showed that the slopes of the log-log vibrotactile magnitude estimation functions decreased at higher stimulus intensity levels for both test sites. Auditory magnitude estimation functions were relatively constant throughout the stimulus range. Cross-modal matching functions for the two stimuli generally agreed with functions predicted from the magnitude estimation data, except when subjects adjusted vibration on the tongue to match auditory stimulus intensities. The results suggested that the methods of magnitude estimation and cross-modal matching may be useful for studying sensory processing in the speech production system. However, systematic investigation of response biases associated with vibrotactile-auditory psychophysical scaling tasks appears to be a prerequisite.

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