Results 161 to 170 of about 20,988 (296)

Proceedings of the 2008 U.S. Geological Survey Karst Interest Group, Bowling Green, Kentucky, May 27-29, 2008 USGS Karst Interest Group USGS Scientific Investigations Report 2008-5023

open access: yes, 2008
Contents: Introduction and Acknowledgments -- Agenda. National Programs: Overview of National Park Service policies for cave and karst management / Dale Pate -- National Cave and Karst Research Institute: Partner for the USGS / Penelope J.
Kuniansky, Eve L.   +1 more
core  

Multidimensional Insights Into the Drivers of Aquatic CO2 Dynamics: A River–Reservoir–Wetland Aquatic Continuum Study Within a Semi‐Arid Region

open access: yesGeophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Evaluating multiple competing biotic and abiotic processes and how they interact with carbon dioxide (CO2) in aquatic systems, is critical to understanding regional and global carbon cycles. Here, we used an aquatic continuum of the Bahe watershed, within a semi‐arid region, to establish a comprehensive conceptual framework for identifying CO2
Mingyu Shao   +11 more
wiley   +1 more source

Effects of Different Land Use Types and Soil Depths on Soil Mineral Elements, Soil Enzyme Activity, and Fungal Community in Karst Area of Southwest China. [PDF]

open access: yesInt J Environ Res Public Health, 2022
Gong J   +12 more
europepmc   +1 more source

Proceedings of the 2002 U.S. Geological Survey Karst Interest Group, Shepherdstown, West Virginia August 20-22, 2002 USGS Karst Interest Group USGS Water-Resources Investigations Report 02-4174

open access: yes, 2002
Contents: Introduction and Acknowledgments -- Agenda.. Integrating Science: Overview of background resources on karst research emphasizing obscure and grey area documents / Barry F. Beck -- National Cave and Karst Research Institute-Progress in the
Kuniansky, Eve L.   +1 more
core  

Human impact on karst in southern Italy: a case study from the Murge plateau (Apulia) [PDF]

open access: yes, 2006
The Murge plateau is a morphostructural high of the Apulian foreland (southern Italy) and is characterised by karst morphology due to widespread outcrops of Cretaceous carbonate rocks. The natural landscape is typical of a low-relief karst very rich in
ANDRIANI, Gioacchino Francesco   +1 more
core  

Role of Unsaturated Zone on Aquifer Leakage–Assessed With Tidal Response

open access: yesGeophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Tidal response analysis is widely used to evaluate aquifer systems, but traditional models that neglect the unsaturated zone often underestimate groundwater leakage. This study develops a new analytical model for tidal analysis that incorporates unsaturated zone effects and explained leakage patterns that traditional models could not resolve ...
Guoliang Wang   +4 more
wiley   +1 more source

Mapping the Interannual Variability of Irrigated Area Using Categorical Sampling and Machine Learning

open access: yesGeophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Accurate irrigated area (IA) mapping is essential for hydrological and climate modeling. However, existing IA mapping approaches typically rely on persistently irrigated or non‐irrigated samples, which has reduced sensitivity to year‐to‐year IA variability.
Xin Tian   +8 more
wiley   +1 more source

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