Results 1 to 10 of about 9,012 (266)

Characterizing Total Phosphorus in Current and Geologic Utah Lake Sediments: Implications for Water Quality Management Issues

open access: yesHydrology, 2018
Utah Lake is highly eutrophic with large phosphorous inflows and a large internal phosphorous reservoir in the sediment. There are debates over whether this phosphorous is from geologic or more recent anthropologic sources. This study characterizes total
Hani Yousef Abu-Hmeidan   +2 more
exaly   +3 more sources

Regime shift to extensive valley glaciations over High Mountain Asia during the Early-Middle Pleistocene [PDF]

open access: yesNature Communications
In contrast to the well-established onset of Northern Hemisphere high-latitude glaciation at ~2.7 Ma, the timing and drivers of the intensified glaciation over High Mountain Asia (HMA) remain elusive, as glacial geologic evidence within this region is ...
Qing Yan   +8 more
doaj   +2 more sources

Near surface sediments introduce low frequency noise into gravity models

open access: yesApplied Computing and Geosciences, 2023
3D geologic modeling and mapping often relies on gravity modeling to identify key geologic structures, such as basin depth, fault offset, or fault dip.
G.A. Phelps, C. Cronkite-Ratcliff
doaj   +1 more source

Rapid estimation of minimum depth-to-bedrock from lidar leveraging deep-learning-derived surficial material maps

open access: yesApplied Computing and Geosciences, 2023
Previously glaciated landscapes often share similar surficial characteristics, including large areas of exposed bedrock, blankets of till deposits, and alluvium-floored valleys. These materials play significant roles in geologic and hydrologic resources,
William Odom, Daniel Doctor
doaj   +1 more source

Burial and Denudation Alter Microbial Life at the Bottom of the Hypo‐Critical Zone

open access: yesGeochemistry, Geophysics, Geosystems, 2023
How subsurface microbial life changed at the bottom of the kilometers‐deep (hypo) Critical Zone in response to evolving surface conditions over geologic time is an open question.
Jennifer McIntosh   +8 more
doaj   +1 more source

Cost-effective mapping of benthic habitats in inland reservoirs through split-beam sonar, indicator kriging, and historical geologic data. [PDF]

open access: yesPLoS ONE, 2014
Because bottom substrate composition is an important control on the temporal and spatial location of the aquatic community, accurate maps of benthic habitats of inland lakes and reservoirs provide valuable information to managers, recreational users, and
Erik R Venteris, Cassandra J May
doaj   +1 more source

Utilizing Remote Sensing and Lithostratigraphy for Iron and Clay Minerals Mapping in the North of Aswan Area, Egypt [PDF]

open access: yesDelta Journal of Science, 2022
Araba, Gilf and Abu Ballas formations contain clay and iron sediments are detected by the processing techniques to the remote sensing data of Landsat-8 OLI/TIRS.
Ola Ghobara   +4 more
doaj   +1 more source

Viruses of sulfur oxidizing phototrophs encode genes for pigment, carbon, and sulfur metabolisms

open access: yesCommunications Earth & Environment, 2023
Viral infections modulate bacterial metabolism and ecology. Here, we investigated the hypothesis that viruses influence the ecology of purple and green sulfur bacteria in anoxic and sulfidic lakes, analogs of euxinic oceans in the geologic past.
Poppy J. Hesketh-Best   +6 more
doaj   +1 more source

Wirkungen des pleistozänen kaltzeitlichen Klimas, insbesondere des Bodenfrostes, in den Sedimenten des östlichen Ostfalen (Raum Hannover - Wolfsburg - Helmstedt -Bad Harzburg - Salzgitter-Bad - Hannover) - Teil 1 [PDF]

open access: yesEiszeitalter und Gegenwart, 1996
In this first part of the publication - a second part especially about ice-wedges and aeolian processes will follow in the next year - the abundant form inventory of diversified periglacial solifluction layers, of horizons of gelifraction, of ...
K.-U. Brosche
doaj   +1 more source

Evaluation of Erodibility of Formations in the Khangah-Sorkh Watershed (Urmia) Using a Rain Simulator [PDF]

open access: yesپژوهش‌های آبخیزداری, 2020
Erosion is one of the major causes of waste of water and soil. Perhaps the main reason for failure to control erosion is the weakness of knowledge and recognition of this phenomenon. Due to the great value of soil and the subsequent problems arising from
Zaher Alizadeh   +2 more
doaj   +1 more source

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