Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Subsidence hazard (3)
- Karst (2)
- Karst breakdown mechanisms (2)
- Karst subsidence (2)
- Speleogenesis (2)
-
- Ural region (2)
- Case breakdown (1)
- Cave breakdown (1)
- Collapse dolines (1)
- Collapse sinkhole (1)
- Engineering classification of karst (1)
- Gypsum caves (1)
- Gypsum karst (1)
- Karst subsidence hazard (1)
- Karst subsidence hazard assessment (1)
- Karst types (1)
- Karstological monitoring (1)
- Medvedova konta pothole (1)
- Motorway construction in karst (1)
- Potash mine (1)
- Russia (1)
- Sinkholes (1)
- Southern Italy (1)
- Stability appraisal (1)
- Subsidence (1)
- Subsidence hazard assessment (1)
- Unroofed caves (1)
Articles 1 - 30 of 34
Full-Text Articles in Entire DC Network
Innovatively Saving The Future Of Transportation: Small Aircraft Transportation System (Sats), Jocelyn Nickerson, Brent Bowen, Russell Smith, Scott Tarry, Massoum Moussavi
Innovatively Saving The Future Of Transportation: Small Aircraft Transportation System (Sats), Jocelyn Nickerson, Brent Bowen, Russell Smith, Scott Tarry, Massoum Moussavi
Journal of Public Transportation
The aviation industry is a rapidly changing entity of the world’s economy. Millions of travelers consistently choose aviation as their mode of transportation because it is reliable, time-efficient, and safe. However, high demand has led to delays, cancellations, and gridlock. As the need for efficient travel options increases, passengers will look for other avenues of travel. Fortuitously, the National Aeronautics and Space Administration (NASA) and its partners are developing a unique and innovative alternative to this problem. The solution, known as the Small Aircraft Transportation System (SATS), will likely change the face of general aviation (GA) as it is known …
Transit Itinerary Calculation On The Web: Based On A Transit User Information System, Martin Trépanier, Robert Chapleau, Bruno Allard
Transit Itinerary Calculation On The Web: Based On A Transit User Information System, Martin Trépanier, Robert Chapleau, Bruno Allard
Journal of Public Transportation
Transit path calculation is not yet widely available on transit authority websites. This is because the calculation of complete transit itineraries requires the integration of underlying components such as Geographic Information Systems (GIS) and operational database and, unlike a simple road application, involves a complex transportation network. In this article, a hybrid algorithm based on heuristics and optimization is presented for the calculation of urban transit itineraries including information on pedestrian access and egress paths, route sequences, schedules, and stops. The use of the Transit User Information System (TUIS) to support the calculations is emphasized. The TUIS uses the Totally …
Applicability Of Bus Rapid Transit To Corridors With Intermediate Levels Of Transit Demand, Graham N. Carey
Applicability Of Bus Rapid Transit To Corridors With Intermediate Levels Of Transit Demand, Graham N. Carey
Journal of Public Transportation
Bus Rapid Transit (BRT) has the potential to bridge the gap between conventional rubber-tired transit operations and rail systems. Based on relatively low-cost, proven technology, BRT is gaining acceptance in many communities around the world that are endeavoring to provide high-quality transit service. While proposed applications of this new mode vary considerably, some conditions may be more appropriate than others. This article explores, from the point of view of the practitioner, some of the benefits and drawbacks of BRT.
Detection Range Setting Methodology For Signal Priority, Peter Koonce, John Ringert, Tom Urbanik, Willie Rotich, Bill Kloos
Detection Range Setting Methodology For Signal Priority, Peter Koonce, John Ringert, Tom Urbanik, Willie Rotich, Bill Kloos
Journal of Public Transportation
A significant amount of delay to transit vehicles in urban areas is caused by traffic signals. Implementation of signal priority has the potential to reduce control delay caused by traffic signals. The implementation of these systems requires engineering studies that address both transit and traffic signal operations. A comprehensive program requires coordination between the transit agency and the transportation department to address needs of both agencies and users. The City of Portland and the Tri-County Metropolitan Transportation District of Oregon (Tri-Met) have been working on a program that exhibits the elements of such an effort. This article details the efforts …
Ottawa And Brisbane: Comparing A Mature Busway System With Its State-Of-The-Art Progeny, Sean Rathwell, Stephen Schijns
Ottawa And Brisbane: Comparing A Mature Busway System With Its State-Of-The-Art Progeny, Sean Rathwell, Stephen Schijns
Journal of Public Transportation
Brisbane, Australia’s new South East Busway, which opened in 2000–2001, is one of the most technologically-advanced Bus Rapid Transit (BRT) systems in the world. It represents the “state-of-the-art” in busway design, infrastructure, and operations management. The South East Busway and various other Brisbane busway initiatives are modeled on Ottawa, Canada’s transitway system. Since commencement of operation in the early 1980s, Ottawa’s network of bus-only roadways and stations has transformed the community into one of the most transit-friendly centers in North America.
The Engineering Classification Of Karst With Respect To The Role And Influence Of Caves, Tony Waltham
The Engineering Classification Of Karst With Respect To The Role And Influence Of Caves, Tony Waltham
International Journal of Speleology
The engineering classification of karst defines various complexities of ground conditions, in terms of the hazards that they provide to potential construction. Karst is divided into five classes (from immature to extreme). The three key parameters within the classification are caves (size and extent), sinkholes (abundance and collapse frequency) and rockhead (profile and relief). As one component of karst, caves are a hazard to foundation integrity, though natural surface collapses over caves are extremely rare. A cave roof is normally stable under engineering loading where the roof thickness is greater than 70% of the cave width. Construction can proceed over …
Karst Breakdown Mechanisms From Observations In The Gypsum Caves Of The Western Ukraine: Implications For Subsidence Hazard Assessment, Alexander Klimchouk, Vjacheslav Andrejchuk
Karst Breakdown Mechanisms From Observations In The Gypsum Caves Of The Western Ukraine: Implications For Subsidence Hazard Assessment, Alexander Klimchouk, Vjacheslav Andrejchuk
International Journal of Speleology
The term karst breakdown is employed in this paper to denote the totality of processes and phenomena of gravitational and/or hydrodynamic destruction of the ceiling of a karst cavity and of the overlying sediments. It refers not only to the existence of a surface subsidence (collapse) feature but, first of all, to the “internal” (hidden in the subsurface) structures that precede development of a surface form. This study reports and discusses the results of direct mapping and examination of breakdown structures in the gypsum karst of the Western Ukraine, at the level of their origin, i.e. in caves. The accessibility …
Mechanisms Of Karst Breakdown Formation In The Gypsum Karst Of The Fore-Ural Region, Russia (From Observations In The Kungurskaja Cave), Vjacheslav Andrejchuk, Alexander Klimchouk
Mechanisms Of Karst Breakdown Formation In The Gypsum Karst Of The Fore-Ural Region, Russia (From Observations In The Kungurskaja Cave), Vjacheslav Andrejchuk, Alexander Klimchouk
International Journal of Speleology
The fore-Ural is a classical region of intrastratal gypsum karst. The intensive development of karst in the Permian gypsums and anhydrites causes numerous practical problems, the subsidence hazard being the most severe. Mechanisms of karst breakdown formation were studied in detail in the Kunguskaya Cave area. The cave and its setting are characteristic to the region and, being a site of detalied stationary studies for many years, the cave represents a convenient location for various karst and speleological investigations. Breakdown structures related to cavities of the Kungurskaya Cave type develop by two mechanisms: gravitational (sagging and fall-in of the ceilings …
Collapse Dolines And Deflector Faults As Indicators Of Karst Flow Corridors, France Šušteršič
Collapse Dolines And Deflector Faults As Indicators Of Karst Flow Corridors, France Šušteršič
International Journal of Speleology
The paper concerns collapse dolines, which appear to be one of the best-defined surface karst phenomena. Despite this appearance, one may find quite different views in the literature, and some of the aspects of their morphogenesis have been overlooked completely. Among these aspects the most obvious is the question of the ongoing development of the closed depression. Five of the most common collapse doline types found in Slovenia are considered in terms of general systems theory, leading to a conclusion that cave roof collapse remains the crucial event in a collapse doline’s development. However, the collapse event itself may be …
Collapse Above The World's Largest Potash Mine (Ural, Russia), Vjacheslav Andrejchuk
Collapse Above The World's Largest Potash Mine (Ural, Russia), Vjacheslav Andrejchuk
International Journal of Speleology
This paper reports the results of the study of a huge collapse that occurred in June 1986 within the area of the 3rd Berezniki potash mine (the Verkhnekamsky potash deposit, Ural). Processes that took place between the first appearance of a water inflow through the mine roof and the eventual collapse are reconstructed in detail. The origin and development of a cavity that induced the collapse are revealed. Two factors played a major role in the formation of the collapse: the presence of a tectonic fold/rupture zone with in both the salt sequence and the overburden (the zone of crush …
Karstology And The Opening Of Caves During Motorway Construction In The Karst Region Of Slovenia, Martin Knez, Tadej Slabe
Karstology And The Opening Of Caves During Motorway Construction In The Karst Region Of Slovenia, Martin Knez, Tadej Slabe
International Journal of Speleology
The nature of karst makes constructing a roadway across karst areas a complex task, which is why karstologists take part in motorway construction across Slovenia’s karst. Working with planners, karstologists select the best route on the basis of preliminary research. Then they carry out regular karstological monitoring of the construction, to study newly discovered karst phenomena, mostly caves, and also help builders overcome the challenges of karst in a way that will preserve nature as much as possible. During the recent construction of a section of motorway, more than three hundred caves were encountered within a sixty-kilometre stretch of road. …
Karst Subsidence In South-Central Apulia, Southern Italy, Marco Delle Rose, Mario Parise
Karst Subsidence In South-Central Apulia, Southern Italy, Marco Delle Rose, Mario Parise
International Journal of Speleology
Subsidence in the karst of Apulia (Southern Italy), one of the classical karst areas of Italy, is described in this paper. The carbonate rocks that make up the geological structure of the Apulia region are affected by subsidence, which is of different type and intensity depending upon geological, topographical, and hydrogeological conditions. In particular, we discriminate between inland subsidence and coastal subsidence. Inland subsidence is generally restricted to the presence of individual cavities, either empty or partly or totally filled with deposits produced by dissolution of soluble rocks underground. Locally, such subsidence can cause severe effects on anthropogenic structures above. …
Wild Plant Classification In Little Dixie : Variation In A Regional Culture, Justin M. Nolan
Wild Plant Classification In Little Dixie : Variation In A Regional Culture, Justin M. Nolan
Journal of Ecological Anthropology
This study examines the relation between folk expertise and wild plant classification in Little Dixie, a seven-county vernacular cultural region in central Missouri. A successive pile-sort task was administered to ten local wild plant "experts" and ten "novices" of Euro-American descent to investigate how ethnobotanical knowledge influences the cognitive construction of folk taxonomies. The results indicate that experts categorize plants according to utilitarian features (e.g., edibility, medicinal value) and morphology (e.g., herbs, trees) while novices rely almost exclusively on morphological traits. While the classification strategies of experts and novices are substantially different, a single categorization system is common to both …
An Earlier Report Of The Exotic Northern Curly-Tailed Lizard In Martin County, Florida, Henry T. Smith, Richard M. Engeman
An Earlier Report Of The Exotic Northern Curly-Tailed Lizard In Martin County, Florida, Henry T. Smith, Richard M. Engeman
Florida Field Naturalist
No abstract provided.
Subsidence Hazards In Different Types Of Karst: Evolutionary And Speleogenetic Approach, Alexander Klimchouk
Subsidence Hazards In Different Types Of Karst: Evolutionary And Speleogenetic Approach, Alexander Klimchouk
International Journal of Speleology
The typology of karst, based on distinguishing the successive stages of general hydrogeological evolution, between which major boundary conditions and the overall circulation pattern change considerably, gives a natural clue, properly to classify and tie together karst breakdown settings, speleogenetic styles and breakdown development mechanisms. Subsidence hazards vary substantially between the different karst types so that classifying individual karst according to typology can provide an integrated general assessment. This provides a useful basis for selection and realization of region- and site-specific assessment schemes and management strategies. Intrastratal karst types, subjacent karst in particular, are most potent in generating subsidence problems. …
A Recent Record Of The Kirtland’S Warbler In Florida, Kurt Radamaker, Cindy Radamaker
A Recent Record Of The Kirtland’S Warbler In Florida, Kurt Radamaker, Cindy Radamaker
Florida Field Naturalist
No abstract provided.
Stability Appraisal Of The Medvedova Konta Pothole, Jože Kortnik
Stability Appraisal Of The Medvedova Konta Pothole, Jože Kortnik
International Journal of Speleology
Until 1956 the underground details of areas around Pokljuka were practically unknown due to the area’s non-karstic outward appearance. However, the presence of karst phenomena on this Alpine plain is undoubtedly indicated, primarily by the absence of a surface drainage network. A mathematical model was made of the Medvedova konta pothole, in which two different sets of material properties were used, corresponding to the Triassic limestone that forms the bedrock under the greater part of Pokljuka. The model simulates the gradual thinning of the ceiling of the underground hall, from the surface downwards, until its collapse. The paper presents a …
Behavioral And Other Human Ecologies: Critique, Response And Progress Through Criticism, Bruce Winterhalder
Behavioral And Other Human Ecologies: Critique, Response And Progress Through Criticism, Bruce Winterhalder
Journal of Ecological Anthropology
This paper has three goals: (1) to define the anthropological subfield of human behavioral ecology (HBE) and characterize recent progress in this research tradition; (2) to address Joseph's (2000) critique of HBE from the perspective of an advocate of that field; and (3) to suggest features that make for effective criticism of research traditions. (1) HBE attempts to understand intra- and inter-societal diversity in human behavior as the product of species-wide adaptive goals which must be realized in highly diverse, socio-environmental circumstances. Theoretically, HBE draws selectively from neo-Darwinism and its cultural-evolutionary analogs, from micro-economics, and from elements of formal decision …
Florida’S New Method Of Evaluating Rare Species: A Report By The Conservation Committee Of The Florida Ornithological Society With Emphasis On A Proposed Reclassification Of The Red-Cockaded Woodpecker, James Cox, R. Todd Engstrom, Ann Paul, Eric Stolen, Eugene Stoccardo
Florida’S New Method Of Evaluating Rare Species: A Report By The Conservation Committee Of The Florida Ornithological Society With Emphasis On A Proposed Reclassification Of The Red-Cockaded Woodpecker, James Cox, R. Todd Engstrom, Ann Paul, Eric Stolen, Eugene Stoccardo
Florida Field Naturalist
No abstract provided.
The Purple Martin By Robin Doughty And Rob Fergus, Charles R. Brown
The Purple Martin By Robin Doughty And Rob Fergus, Charles R. Brown
Florida Field Naturalist
No abstract provided.
Reply To Winterhalder's Behavioral And Other Human Ecologies: Critique, Response And Progress Through Criticism, Suzanne Joseph
Reply To Winterhalder's Behavioral And Other Human Ecologies: Critique, Response And Progress Through Criticism, Suzanne Joseph
Journal of Ecological Anthropology
No abstract provided.
Additional 16th Century Bird Reports From Florida, David W. Johnston
Additional 16th Century Bird Reports From Florida, David W. Johnston
Florida Field Naturalist
No abstract provided.
Creative Collaboration: A Partial Primer For The Social Intellect, Felice S. Wyndham
Creative Collaboration: A Partial Primer For The Social Intellect, Felice S. Wyndham
Journal of Ecological Anthropology
No abstract provided.
Long Dispersal Of A Red-Cockaded Woodpecker In Central Florida, Laura Lowery, Jennifer Perkins
Long Dispersal Of A Red-Cockaded Woodpecker In Central Florida, Laura Lowery, Jennifer Perkins
Florida Field Naturalist
No abstract provided.
Double-Crested Cormorant Attempting To Eat A Bird, John H. Michael Jr.
Double-Crested Cormorant Attempting To Eat A Bird, John H. Michael Jr.
Florida Field Naturalist
No abstract provided.
Agonistic Behavior In The Swallow-Tailed Kite, W. Boyd Blihovde
Agonistic Behavior In The Swallow-Tailed Kite, W. Boyd Blihovde
Florida Field Naturalist
No abstract provided.
Distribution, Population Status, And Documentation Of Exotic Parrots In Broward County, Florida, Bill Pranty, Susan Epps
Distribution, Population Status, And Documentation Of Exotic Parrots In Broward County, Florida, Bill Pranty, Susan Epps
Florida Field Naturalist
No abstract provided.
Distribution, Abundance, And Breeding Biology Of Potential Cowbird Hosts On Sanibel Island, Florida, John W. Prather, Alexander Cruz
Distribution, Abundance, And Breeding Biology Of Potential Cowbird Hosts On Sanibel Island, Florida, John W. Prather, Alexander Cruz
Florida Field Naturalist
No abstract provided.
An Empirical Exploration Of Bus Travel Times And Dwell Times In A Highly Competitive Exclusive Busway, Daniel A. Rodriguez, Arturo Ardila
An Empirical Exploration Of Bus Travel Times And Dwell Times In A Highly Competitive Exclusive Busway, Daniel A. Rodriguez, Arturo Ardila
Journal of Public Transportation
Busway transit has reemerged as a cost-effective transportation alternative for providing urban mobility. This article examines the operational characteristics of an exclusive busway svstem with high passenger ridership and subject to the competitive forces of individual operators. Results of a running time model suggest that the increase in running time associated with an additional passenger movement is low but that the delay imposed by recurrent vehicle deceleration and acceleration related to frequent stops is high. Frequent vehicle stops reduce fuel efficiency, increase pollution, reduce travel time, and decrease productivity. Results of several specifications of dwell-time regression models indicate that established …