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Articles 52261 - 52290 of 59400
Full-Text Articles in Entire DC Network
Gypsum Karst Of The World: A Brief Overview, Alexander Klimchouk, Paolo Forti, Anthony Cooper
Gypsum Karst Of The World: A Brief Overview, Alexander Klimchouk, Paolo Forti, Anthony Cooper
International Journal of Speleology
Short description of caves and karsts in gypsum of different parts of the World.
Gypsum Karst In The United States, Kenneth S. Johnson
Gypsum Karst In The United States, Kenneth S. Johnson
International Journal of Speleology
Gypsum is one of the most soluble of common rocks; it is dissolved readily to form caves, sinkholes, disappearing streams, and other karst features that typically are found in limestones and dolomites. The four basic requirements for gypsum karst to develop are: (1) a deposit of gypsum; (2) water, unsaturated with CaSO4 (3) an outlet for escape of dissolving water; and (4) energy to cause water to flow through the system. Gypsum deposits are present in 32 of the 48 conterminous United States, and they underlie about 35-40% of the land area; they are reported in rocks of every …
Gypsum Karst Of Great Britain, Anthony H. Cooper
Gypsum Karst Of Great Britain, Anthony H. Cooper
International Journal of Speleology
In Great Britain the most spectacular gypsum karst development is in the Zechstein gypsum (late Permian) mainly in north-eastern England. The Midlands of England also has some karst developed in the Triassic gypsum in the vicinity of Nottingham. Along the north-east coast, south of Sunderland, well-developed palaeokarst, with magnificent breccia pipes, was produced by dissolution of Permian gypsum. In north-west England a small gypsum cave system of phreatic origin has been surveyed and recorded. A large actively evolving phreatic gypsum cave system has been postulated beneath the Ripon area on the basis of studies of subsidence and boreholes. The rate …
Gypsum Karst Of France, Michel Chardon, Jean Nicod
Gypsum Karst Of France, Michel Chardon, Jean Nicod
International Journal of Speleology
Many small and scattered areas of gypsum karst are present in France. They occur in the plains and plateaux (Paris, Lorraine, Provence) as well as in the mountains, especially the Alps. Typical gypsum karst landforms are well developed and widespread, but underground cavities are scarce, despite much exploration and the apparent existence of subsurface waterflow. The Alps and Provence contain the largest karstic areas.
The Gypsum Karst Of Italy, Paolo Forti, Ugo Sauro
The Gypsum Karst Of Italy, Paolo Forti, Ugo Sauro
International Journal of Speleology
Gypsum karst has been studied in Italy since the last decades of the l9th Century. In 1917 the geographer Olinto Marinelli published “Fenomeni carsici delle regioni gessose d’Italia”, a fundamental synthesis of the early research. He distinguished 56 different morpho-karstic gypsum units and/or areas, which are all different in size and character, and described them, paying special attention to their surface morphology and hydrology. Marinelli listed all the main gypsum units and only a few secondary outcrops were overlooked. After Marinelli’s synthesis, except for some discussion of archaeological caves, only a few papers about gypsum karst and environment were published …
Gypsum Karst Of The Eastern-European Plain, Vjacheslav Andrejchuk, Alexander Klimchouk
Gypsum Karst Of The Eastern-European Plain, Vjacheslav Andrejchuk, Alexander Klimchouk
International Journal of Speleology
Description of karst in the Eastern European Plain, comprising the following regions: Baltic, Timansky, Pinego-Severodvinsky, Volgo-Kamsky, Pre-Ural, Pre-Caspian, Donetsk and Podol'sko Bukovinsky.
Gypsum Karst In The Western Ukraine, Alexander Klimchouk
Gypsum Karst In The Western Ukraine, Alexander Klimchouk
International Journal of Speleology
The great gypsum karst of the Western Ukraine, which is associated with Miocene (Badenian) gypsum, provides the worlds foremost examples of intrastratal gypsum karst and speleogenesis under artesian conditions. Differential neotectonic movements have resulted in various parts of the territory displaying different types (stages) of intrastratal karst, from deep-seated, through subjacent, to entrenched. Internal gypsum karstification proceeded mainly under confined hydrogeological conditions. While such development still continues in part of the territory, other parts exhibit entrenched karst settings. Huge relict maze cave systems have been explored here, five of which are currently the longest known gypsum caves in the world. …
Gypsum Karst Of The Baltic Republics, Bernardas Paukstys, Vytautas Narbutas
Gypsum Karst Of The Baltic Republics, Bernardas Paukstys, Vytautas Narbutas
International Journal of Speleology
The Baltic Republics of Estonia, Latvia and Lithuania have karst areas developed in both carbonate and gypsiferous rocks. In the north, within the Republic of Estonia, Ordovician and Silurian limestones and dolomites crop out, or are covered by glacial Quaternary sediments. To the south, in Latvia and Lithuania, gypsum karst is actively developing in evaporites of Late Devonian (Frasnian) age. Although gypsum and mixed sulphate-carbonate karst only occupy small areas in the Baltic countries, they have important engineering and geo-ecological consequences. Due to the rapid dissolution of gypsum, the evolution of gypsum karst causes not only geological hazards such as …
Gypsum Karst Of The Pre-Ural Region, Russia, Vjacheslav Andrejchuk
Gypsum Karst Of The Pre-Ural Region, Russia, Vjacheslav Andrejchuk
International Journal of Speleology
Description of the gypsum karst of the pre-Ural region in Russia, with special emphasis on speleogenesis.
Gypsum Karst In The South Of The Siberian Platform, Russia, Yuri Trzcinski
Gypsum Karst In The South Of The Siberian Platform, Russia, Yuri Trzcinski
International Journal of Speleology
Description of gypsum karst in Siberia.
Dissolution Of Gypsum From Field Observations, Alexander Klimchouk, Franco Cucchi, Jose Maria Calaforra, Sergey Aksem, Furio Finocchiaro, Paolo Forti
Dissolution Of Gypsum From Field Observations, Alexander Klimchouk, Franco Cucchi, Jose Maria Calaforra, Sergey Aksem, Furio Finocchiaro, Paolo Forti
International Journal of Speleology
The paper reports the results of field measurements of gypsum dissolution in various countries (Ukraine, Spain, Italy and others) and in different environments (river waters, precipitation, vadose zone, unconfined aquifer, perched cave lakes, ephemeral streams in caves, confined aquifer, cave air).
The Typology Of Gypsum Karst According To Its Geological And Geomorphological Evolution, Alexander Klimchouk
The Typology Of Gypsum Karst According To Its Geological And Geomorphological Evolution, Alexander Klimchouk
International Journal of Speleology
Definition of karst in gypsum and explanation of different types of karst in gypsum: intrastratal, exposed, covered, buried, exumed and palaeokarst.
Environmental Problems In Gypsum Karst Terrains, Alexander Klimchouk, Vjacheslav Andrejchuk
Environmental Problems In Gypsum Karst Terrains, Alexander Klimchouk, Vjacheslav Andrejchuk
International Journal of Speleology
Description of environmental problems in gypsum karst areas, especially of the effects related to human impacts that are unique to gypsum karst systems or most commonly occur herein. The paper deals with pollution (oil, radioactive substances and fertilizers), mining activity, underground water abstraction, construction of dams and reservoirs, collapse and subsidence hazards giving examples of former Soviet Union.
Gypsum Karst Of Germany, Stephan Kempe
Gypsum Karst Of Germany, Stephan Kempe
International Journal of Speleology
Description of gypsum karst and caves in Germany.
Some Examples Of Gypsum Karsts And The More Important Gypsum Caves In Spain, Jose Maria Calaforra, Antonio Pulido-Bosch
Some Examples Of Gypsum Karsts And The More Important Gypsum Caves In Spain, Jose Maria Calaforra, Antonio Pulido-Bosch
International Journal of Speleology
Spain possesses some of the most important examples of gypsum karst in Europe, in terms of the extent and variety of the gypsiferous outcrops. These are divided into gypsum belonging to the Triassic, Palaeogene and Neogene epochs, each of which displays different lithological and structural aspects. Some of Spain’s most significant gypsum karsts, from the speleological standpoint, are described, and these share a common characteristic of all supporting the development of large caves. Reference is made to the geomorphology, hydrogeology and hydrochemistry of the gypsum karsts of Sorbas, Vallada and Gobantes-Meliones, which provide significant examples of intrastratal karst, speleogenesis by …
Gypsum Karst In China, Lu Yaoru, Anthony H. Cooper
Gypsum Karst In China, Lu Yaoru, Anthony H. Cooper
International Journal of Speleology
The Peoples Republic of China has the largest gypsum resources in the world and a long history of their exploitation. The gypsum deposits range in age from Pre-Cambrian to Quaternary and their genesis includes marine, lacustrine, thermal (volcanic and metasomatic), metamorphic and secondary deposits. The gypsum is commonly associated with other soluble rocks such as carbonates and salt. These geological conditions, regional climate differences and tectonic setting strongly influence the karstification process resulting in several karst types in China. Well developed gypsum palaeokarst and some modem gypsum karst is present in the Fengfeng Formation (Ordovician) gypsum of the Shanxi and …
How Rigid Is The Stable Interior Of The North American Plate?, Timothy H. Dixon, Ailin Mao, Seth Stein
How Rigid Is The Stable Interior Of The North American Plate?, Timothy H. Dixon, Ailin Mao, Seth Stein
School of Geosciences Faculty and Staff Publications
We analyze data from eight permanent GPS stations broadly distributed through the interior of the North American plate, and use the resulting velocities to estimate an Euler vector describing motion of “stable” North America as a single rigid plate. The site velocities fit the single plate model with a mean residual of 1.3 mm/yr. The residuals do not appear to reflect post-glacial rebound, and tests for differential motion between eastern and western North America at the New Madrid seismic zone show no resolvable motion within uncertainties. The residuals likely reflect observational error, and thus our estimate of the stability of …
Resource Notes-Academic Year 1995-96
Resource Notes-Academic Year 1995-96
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Resource News-Summer 1996
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Registered Irrigation Wells In Nebraska-Summer 1995, Mack Ann, Jim Weir, Jennifer Sharpe
Registered Irrigation Wells In Nebraska-Summer 1995, Mack Ann, Jim Weir, Jennifer Sharpe
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Regional Hydrogeologic Summaries From Domestic Water-Well Quality In Nebraska -- Hat Creek-White River Drainage Basin, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Regional Hydrogeologic Summaries From Domestic Water-Well Quality In Nebraska -- Hat Creek-White River Drainage Basin, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Regional Analysis Of Rural Domestic Well-Water Quality -- Missouri River Lowlands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Regional Analysis Of Rural Domestic Well-Water Quality -- Missouri River Lowlands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Regional Analysis Of Rural Domestic Well-Water Quality -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Regional Analysis Of Rural Domestic Well-Water Quality -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Regional Analysis Of Rural Domestic Well-Water Quality -- North Central Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Regional Analysis Of Rural Domestic Well-Water Quality -- North Central Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- East Central Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside
Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- East Central Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Geology Of The Liquid Propane Gas Storage Facility Near Greenwood, Nebraska, R. R. Burchett
Geology Of The Liquid Propane Gas Storage Facility Near Greenwood, Nebraska, R. R. Burchett
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Resource News-Winter 1995-96
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Domestic Well-Water Quality In Rural Nebraska, D. C. Gosselin, J. Headrick, X. H. Chen, S. Summerside, R. Tremblay, K. Bottger
Domestic Well-Water Quality In Rural Nebraska, D. C. Gosselin, J. Headrick, X. H. Chen, S. Summerside, R. Tremblay, K. Bottger
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
Vegetative Filter Strip Design For Grassed Areas Treated With Animal Manures, Dwayne R. Edwards, Tommy C. Daniel, Philip A. Moore Jr.
Vegetative Filter Strip Design For Grassed Areas Treated With Animal Manures, Dwayne R. Edwards, Tommy C. Daniel, Philip A. Moore Jr.
Biosystems and Agricultural Engineering Faculty Publications
Vegetative filter strips (VFS) are a low-cost management option that have been demonstrated to be effective in reducing runoff transport of fertilizer constituents applied to grassed areas (pasture or meadow). Runoff quality studies involving fertilizers applied to grassed areas suggest that VFS can be designed by assuming that (1) only infiltration is responsible for pollutant removal, (2) the first post-application runoff event is most important from a water quality perspective (enabling a design event approach), and (3) no pollutant build-up that degrades VFS performance will occur. The purpose of this study was to develop a VFS design algorithm for grassed …
Quality Of Runoff From Four Northwest Arkansas Pasture Fields Treated With Organic And Inorganic Fertilizer, Dwayne R. Edwards, Tommy C. Daniel, John F. Murdoch, Philip A. Moore Jr.
Quality Of Runoff From Four Northwest Arkansas Pasture Fields Treated With Organic And Inorganic Fertilizer, Dwayne R. Edwards, Tommy C. Daniel, John F. Murdoch, Philip A. Moore Jr.
Biosystems and Agricultural Engineering Faculty Publications
Long-term land application of animal manures, even at agronomic rates, can promote accumulation of soil phosphorus (P) which can, in turn, contribute to increased P loadings to downstream waters. The objective of this study was to assess the soil and runoff effects of replacing animal manure as a soil amendment with inorganic fertilizer (ammonium nitrate, NH4NO3) on fields that had been treated previously with animal manures. Runoff from two pairs of small fields (0.57 to 1.46 ha) was sampled from September 1991 to April 1994. All fields had been treated previously with animal manures; after runoff …