Performance of Shallow Subsurface Drains in Glacial Till Soils

1968 ◽  
Vol 11 (2) ◽  
pp. 0214-0217
Author(s):  
E. Rapp
Keyword(s):  
Glacial Till ◽  
Shallow Subsurface ◽  
Subsurface Drains

Shallow Subsurface Drains to Reduce Nitrate Losses from Drained Agricultural Lands

2003 ◽  
Author(s):  
M.R. Burchell II ◽  
R.W. Skaggs ◽  
G.M. Chescheir ◽  
J.W. Gilliam ◽  
L.A. Arnold
Keyword(s):  
Agricultural Lands ◽  
Shallow Subsurface ◽  
Nitrate Losses ◽  
Subsurface Drains

SHALLOW SUBSURFACE DRAINS TO REDUCE NITRATE LOSSES FROM DRAINED AGRICULTURAL LANDS

2005 ◽  
Vol 48 (3) ◽  
pp. 1079-1089 ◽  
Author(s):  
M. R. Burchell II ◽  
R. W. Skaggs ◽  
G. M. Chescheir ◽  
J. W. Gilliam ◽  
L. A. Arnold
Keyword(s):  
Agricultural Lands ◽  
Shallow Subsurface ◽  
Nitrate Losses ◽  
Subsurface Drains

The Effect of Shallow Subsurface Drains on Nitrate-N and Phosphorus Losses from Drained Agricultural Lands

2005 ◽  
Author(s):  
C.A. Pool ◽  
R.W. Skaggs ◽  
G.M. Chescheir ◽  
J.W. Gilliam ◽  
M.R. Burchell II
Keyword(s):  
Agricultural Lands ◽  
Shallow Subsurface ◽  
Nitrate N ◽  
Subsurface Drains ◽  
Phosphorus Losses

Conjectures, Hypotheses, and Theories of Drumlin Formation (In memory of Stanislaw Baranowski)

1981 ◽  
Vol 27 (97) ◽  
pp. 503-505 ◽  
Author(s):  
Ian J. Smalley
Keyword(s):  
Shear Strength ◽  
Pore Water ◽  
Stress Level ◽  
Critical Stress ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Glacial Till ◽  
Forming Process ◽  
Stress Levels

AbstractRecent investigations have shown that various factors may affect the shear strength of glacial till and that these factors may be involved in the drumlin-forming process. The presence of frozen till in the deforming zone, variation in pore-water pressure in the till, and the occurrence of random patches of dense stony-till texture have been considered. The occurrence of dense stony till may relate to the dilatancy hypothesis and can be considered a likely drumlin-forming factor within the region of critical stress levels. The up-glacier stress level now appears to be the more important, and to provide a sharper division between drumlin-forming and non-drumlin-forming conditions.

scholarly journals Integrated magnetotelluric and seismic investigation of Cenozoic graben structure near Obrzycko, Poland

2021 ◽  
Author(s):  
Adam Cygal ◽  
Michał Stefaniuk ◽  
Anna Kret
Keyword(s):  
Seismic Data ◽  
Geophysical Methods ◽  
Geological Structure ◽  
Data Sets ◽  
Low Velocity ◽  
Shallow Subsurface ◽  
Geophysical Model ◽  
Novel Approach ◽  
Loose Deposits ◽  
Static Corrections

AbstractThis article presents the results of an integrated interpretation of measurements made using Audio-Magnetotellurics and Seismic Reflection geophysical methods. The obtained results were used to build an integrated geophysical model of shallow subsurface cover consisting of Cenozoic deposits, which then formed the basis for a detailed lithological and tectonic interpretation of deeper Mesozoic sediments. Such shallow covers, consisting mainly of glacial Pleistocene deposits, are typical for central and northern Poland. This investigation concentrated on delineating the accurate geometry of Obrzycko Cenozoic graben structure filled with loose deposits, as it was of great importance to the acquisition, processing and interpretation of seismic data that was to reveal the tectonic structure of the Cretaceous and Jurassic sediments which underly the study area. Previously, some problems with estimation of seismic static corrections over similar grabens filled with more recent, low-velocity deposits were encountered. Therefore, a novel approach to estimating the exact thickness of such shallow cover consisting of low-velocity deposits was applied in the presented investigation. The study shows that some alternative geophysical data sets (such as magnetotellurics) can be used to significantly improve the imaging of geological structure in areas where seismic data are very distorted or too noisy to be used alone

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