Results 51 to 60 of about 228 (134)

Stratigraphic evidence for modern‐like glacier extents in south‐central Alaska within the last glacial period (MIS 3)

Boreas, Volume 55, Issue 2, Page 476-502, April 2026.
The last (Wisconsinan) glacial period was punctuated in North America by two glacial maxima, known as the Early and Late Wisconsinan glaciations. In Alaska, these maxima and their subsequent retreats have been the object of dating efforts to reconstruct local climatic events and compare them to global trends.
Bruno Belotti, Elizabeth J. Cassel, Timothy C. Bartholomaus, Michael G. Loso, Michael S. Christoffersen, John W. Holt   +5 more
wiley   +1 more source

High-resolution transient electromagnetic inversion method based on regression tree and gramian constraint

Frontiers in Earth Science
The conventional one-dimensional (1D) inversion of transient electromagnetic method (TEM) data is widely used for subsurface resistivity imaging; however, its vertical resolution is often limited by electromagnetic diffusion and inversion non-uniqueness,
Qiping Jiang, Weihua Yao, Ping Li, Ping Li, Xueyang Sun, Chao Su   +5 more
doaj   +1 more source

Groundwater Temperature Processes and Patterns: Implications for Stream Thermal Regimes

WIREs Water, Volume 13, Issue 2, March/April 2026.
Shallow groundwater temperatures are controlled by ground surface temperatures and are influenced by climate change and land cover changes. Deeper groundwater temperature is constant year‐round, making it cooler (warmer) in the summer (winter) than surface water, and exhibits a lagged response to surface warming.
Barret L. Kurylyk, Christa Kelleher, Dylan J. Irvine, Hayden A. Tackley, Jason A. Leach, Bethany T. Neilson, Victor F. Bense   +6 more
wiley   +1 more source

Advances in research on borehole geophysical exploration and associated equipment for advance detection of underground water hazards in coal mines

Meitian dizhi yu kantan
BackgroundDeep coal mining is facing increasingly complex hidden disaster-causing factors, including faults, collapse columns, water accumulation in goaves, confined water in coal seam floors, and hydraulically conductive fracture zones. In this context,
Qiang WU, Xianhui WANG, Donghui YANG, Wenhao XIAO, Zhuangjie CUI, Han CHEN, Zhen SHENG, Yifan ZENG   +7 more
doaj   +1 more source

Forward Modeling Analysis in Advanced Exploration of Cross-Hole Grounded-Wire-Source Transient Electromagnetic Method

Applied Sciences
To address the challenge of accurately detecting hidden water inrush hazards ahead of working faces, a cross-hole transient electromagnetic (TEM) method utilizing a grounded-wire source is proposed.
Jiao Zhu, Zhihai Jiang, Maofei Li, Zhonghao Dou, Zhaofeng Gao   +4 more
doaj   +1 more source

Investigating surface-borehole transient electromagnetic responses from veined orebodies considering induced polarization effects

Meitian dizhi yu kantan
ObjectiveThe observational data derived using the surface-borehole transient electromagnetic (TEM) method tend to feature complex curve morphologies, a problem posing significant challenges to data processing and interpretation.
Jianhui LI, Yao WANG, Wenchuang WANG, Shaojian XIE, Siwei ZHU   +4 more
doaj   +1 more source

A method for advance detection of underground concealed water hazards in coal mines based on borehole transient electromagnetic method and vector synthesis

Meitian dizhi yu kantan
BackgroundThe advance detection of underground concealed water hazards in coal mines is crucial to ensuring the safe and efficient roadway tunneling. The borehole transient electromagnetic (TEM) method allows for long-distance advance detection. However,
Tao FAN, Yue HAO, Ping LI, Rui ZHAO, Zaibin LIU, Liang MA, Peng LI, Junsheng YAN   +7 more
doaj   +1 more source

Application of long-distance tunneling and detection for advance detection in excavation using shield tunneling machines

Meitian dizhi yu kantan
Objective and MethodDuring the rapid excavation process using shield tunneling machines in coal mines, the advance detection of concealed geological anomalies encounters challenges of limited space and insufficient accuracy.
Chao CHEN, Ping LI, Wei LI, Rong WEI
doaj   +1 more source

Three-Dimensional Borehole–Surface TEM Forward Modeling with a Time-Parallel Method

Applied Sciences
The three-dimensional borehole-to-surface transient electromagnetic (BSTEM) method plays a critical role in resolving subsurface conductivity structures under complex geological conditions.
Sihao Wang, Hui Cao, Ruolong Ma
doaj   +1 more source

Advances in research and future prospects of borehole geophysical prospecting technology for coal mines

Meitian dizhi yu kantan
Background Borehole geophysical prospecting technology for coal mines integrates the advantages of both drilling and geophysical prospecting. Accordingly, multiple critical advances have been achieved in its applications to the technologies and equipment
Ping LI, Rong WEI, Tao FAN, Rui ZHAO, Bici JIANG, Xiaochao TIAN, Bingchun WANG   +6 more
doaj   +1 more source