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Showing 1 to 18 of 18 for “"Karst system"”.
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Hydrochemistry in an Alpine Karst System, Sequoia and Kings Canyon National Parks, California
… data from 2001 through 2003 from an alpine karst spring located at 2,500 m amsl in Sequoia National Park, California to reveal detailed chemical parameters of this karst system. The data show a system with a pronounced spring run-off, extended periods of base flow quiescence, storm responses …
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Relationships Between Landscape, Spatial Scale, and Stream Water Chemistry in a Subtropical Karst System
Natural factors such as climate, geology, topography, and vegetation regulate biogeochemical processes that dictate important river characteristics, including surface water chemistry (Allan, 2004). Converting natural vegetation for urban and agricultural land use can alter water chemistry, creating …
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Fate and Transport of E. coli Through Appalachian Karst Systems
Karst waters serve as important water sources in rural Appalachia and are well-connected to surface waters, making them susceptible to anthropogenic contamination, including by fecal indicator bacteria which represent a public health risk. This work designed and implemented a watershed-scale …
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Analysis of Effects of Urbanization on Spring Geochemistry and Sediment for a Karst Aquifer in Valley Creek Basin, Chester County, Pennsylvania
… County, southeastern Pennsylvania, is an urban karst system. Four springs within the Elbrook Formation and two springs in the Ledger Dolomite have been monitored for suspended sediment, baseflow water chemistry, and storm response. Data from previous studies at two rural sites, Nolte in …
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The springshed and potential recharge areas for the Downtown Salado Spring Complex, Salado, Texas.
… of the Edwards (BFZ) Aquifer is a complex, karst system experiencing increases in groundwater demand and environmental stresses in response to a growing population. This study delineated the Salado Springshed under baseflow conditions and identified significant recharge zones by analyzing …
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Water Quality Impacts from Agricultural Land-Use in the Karst Groundwater Basin of Qingmuguan, Chongqing, China
Karst regions are composed of soluble rock, often limestone, which leads to the formation of fissures, sinkholes and water flow conduits such as caves. Pollutants in karst waters tend to be quickly directed and concentrated into these subsurface conduits. As a result of this and other factors, …
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Seismic Expressions of Paleokarst
<p>Paleokarst are characterized by epigene and/or hypogene processes in their formation and hold significant numbers of hydrocarbons and other natural resources. This dissertation examines worldwide seismic expression of paleokarst; and specifically, the characterization of paleokarst reservoirs …
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Storm Response and Water Balance of Temperate Rainforest Karst Watersheds: Tongass National Forest, Alaska
… Alaska contains 2,176 square kilometers of karst. As part of the evolving Tongass Land Management Plan, research into the function of karst systems is crucial in understanding how forest management affects not only karst areas but also surrounding ecosystems. Dye trace and water balance …
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Evaluating the Effectiveness of Regulatory Stormwater Monitoring Protocols on Groundwater Quality in Urbanized Karst Regions
… the United States today, particularly in urban karst settings. In these settings, the use of karst features and injection wells for stormwater management results in virtually untreated water being directed into the karst aquifer. Currently, no policies exist specifically to provide water quality …
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Sources of CO<sub>2</sub> Controlling the Carbonate Chemistry of the Logsdon River, Mammoth Cave, Kentucky
… Turnhole Bend Drainage basin of the Mammoth Cave System. The Logsdon River system has provided a unique opportunity to examine the geochemical evolution of a stream flowing through a major karst conduit that can be traversed for 10 km. This study examines CO<sub>2</sub> inputs at the upstream …
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Geochemistry of cave pools in the Guadalupe Mountains, NM : implications for geomicrobiology
… pools align along NE and NW structures in the karst system. The intersection of Permian structures and Cenozoic related structures provide pathways for infiltrating water. Water samples were collected from 19 new cave pools; the results were integrated with published geochemistry from 192 cave …
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Assessing landscape and seasonal controls on CO2 fluxes in a karst sinkhole
Karst landscapes can serve as carbon sinks when carbon dioxide (CO2) reacts with water to form carbonic acid, which then weathers carbonate rocks. However, CO2 can also move through the subsurface via gas diffusion, a process that is not well-understood in karst systems. This study focused on …
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Geophysical Imaging of Karst Features in Missouri
… waves (MASW) and boring data were used to map karst related features in Missouri in order to understand karst processes better in Missouri. Previous works on karst in Missouri were mostly surficial mapping of bedrock outcrops and joints, which are not enough to define the internal structure of …
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Using Nutrients, Sediment, Ions, Isotopes, and Hydrograph Separation to Quantify Conduit-Dominated Recharge Processes in a Trinity Aquifer Site: Cave Without a Name
… for sampling waters transported through a karst system because they integrate basin-wide sources ranging from fast flow in conduits to slow flow through the bedrock matrix. Although numerous studies have monitored cave streams to characterize these process, most have infrequent sampling …
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Speleothem Palaeoclimatology in the Maya Lowlands of Northwestern Yucatán, Mexico
… at both caves of origin, and the ability of the karst system at the site of Tzab06-1 to transmit and record seasonal climate change is confirmed. This work provides new records with which spatiotemporally high-resolution analysis of human-climate-environment interactions in the Terminal Classic …
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The influence of vicariance and dispersal on the diversification and evolution of springtails (collembola)
… obligate ecological associations offer simple systems to evaluate biogeographical hypotheses and also provide an ecological context to test the effects and consequences of specialization on patterns of diversity. In Chapter 1, I identify and compare spatial and temporal patterns of molecular …
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Geochemistry of karst deposits in Borneo detailing hydroclimate variations in the Warm Pool across the late Pleistocene
Variability in the tropical ocean-atmospheric system causes global scale climate anomalies, most evident in the El Niño-Southern Oscillation’s coupled climate feedbacks. Despite being an area of high interest, many questions still remain regarding the west Pacific warm pool’s response to external …
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The invisible problem of microplastics and microfibres in karst systems and aquifers: a multidisciplinary approach
L'abstract è presente nell'allegato / the abstract is in the attachment