Late Cretaceous Ammonites And Other Non-Rudist Mollusks From Costa Rica And Their Paleoecology, 2025 University of New Mexico
Late Cretaceous Ammonites And Other Non-Rudist Mollusks From Costa Rica And Their Paleoecology, Esteban David Lopez-Murillo
Earth and Planetary Sciences ETDs
The Nicoya region in northwestern Costa Rica contains a rich record of Upper Cretaceous fossiliferous sediments, which have received variable levels of study over the past several decades. In particular, rudists from these deposits have been well-characterized, however, the non-rudist ammonite, gastropod, and bivalve fauna have received much less attention. However, this area is particularly important because the Nicoya region was attached to the southernmost tip of North America, making it a unique crossroad between the western Tethys (Caribbean) and Pacific Oceans. Here I present a detailed investigation of these rocks and their fauna between the Late Campanian to Early …
Investigating The Thermal Stratification Patterns Of A Shallow Polymictic Boreal Shield Lake And The Effectiveness Of Models In Predicting Shallow Lake Thermal Profiles, 2025 Wilfrid Laurier University
Investigating The Thermal Stratification Patterns Of A Shallow Polymictic Boreal Shield Lake And The Effectiveness Of Models In Predicting Shallow Lake Thermal Profiles, Matthew Roberts
Theses and Dissertations (Comprehensive)
Thermal stratification is a core process of lakes which plays a critical role in shaping the ecological dynamics of lakes, influencing major processes like nutrient cycling and oxygen availability. For shallow polymictic lakes, thermal stratification patterns present some unique differences due to the complex and variable nature of these lakes. In this thesis, I examined thermal stratification in a shallow polymictic lake in northwestern Ontario during the ice-free season of 2019 to investigate the frequency, duration, and driving factors of thermal stratification. The lake underwent 146 separate stratification events, with a median duration of 2 hours per event, with a …
Geomorphic Evolution Of St. Augustine Inlet, St. Johns County, Florida, 2024 Florida Institute of Technology
Geomorphic Evolution Of St. Augustine Inlet, St. Johns County, Florida, Kristen Becker
Theses and Dissertations
Tidal inlets interrupt longshore sediment transport, influencing adjacent beach morphology and allowing the exchange of water and sediment between the open oceans and protected back barrier bay. Inlets evolve through a combination of natural processes and are highly dynamic zones where sediment exchanges cause shifting shoreline positions nearby and create new morphological features. Barrier islands/beaches that are close in proximity to inlets evolve and are an important natural feature that dissipates wave energy and protects inland areas. Both natural and anthropogenic processes that affect barrier islands will be investigated during this study, including storm activity, waves, wind, water level, and …
Testing For Patterns Of Deformation From The Yellowstone Hotspot Along The Gallatin River, Sw Montana, 2024 Utah State University
Testing For Patterns Of Deformation From The Yellowstone Hotspot Along The Gallatin River, Sw Montana, Jack Willard
All Graduate Theses and Dissertations, Fall 2023 to Present
Yellowstone has fascinated humans for thousands of years. Geologists have addressed many of the region’s mysteries, including the underlying mantle hotspot, the chain of calderas tracking the motion of the North American Plate over this hotspot, and the risks posed by the super volcano. However, the way that the hotspot impacts regional tectonics and topography remains under-studied. Influential previous work recognized the Yellowstone Crescent of High Terrain (YCHT), an arc of high topography around the Yellowstone Plateau with limbs extending to the west and south into central Idaho and northern Utah. The YCHT is also hypothesized to be the pattern …
Geochemical Evidence Of Drying During The 4.2 Ka Event In Sediment Cores From The Yucatán Peninsula, Mexico, 2024 Missouri University of Science and Technology
Geochemical Evidence Of Drying During The 4.2 Ka Event In Sediment Cores From The Yucatán Peninsula, Mexico, Derek K. Gibson, Jonathan Obrist-Farner, Alex Correa-Metrio, Alejandra Rodriguez-Abaunza, Carlos Castañeda-Posadas
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Tropical hydroclimate variability during the Middle and Late Holocene was investigated using geochemical indicators of local-scale precipitation and evaporation preserved in sediment cores from two sites in the Mexican Yucatán Peninsula. Scanning X-Ray fluorescence spectroscopy data show generally decreasing precipitation trends during the Early and Middle Holocene. During the transition between the Middle and Late Holocene, geochemical evidence of reduced watershed erosion and increased evaporation indicate that a centennial-scale drying event impacted the region between 4.3 and 4.0 ka (kilo-anum; thousand years before present). These findings suggest that the 4.2 ka drying event, which has been previously recorded in Europe, …
Characterizing Unconserved Shallow Wetlands In Lamoure County, North Dakota, 2024 Murray State University
Characterizing Unconserved Shallow Wetlands In Lamoure County, North Dakota, Nathan Watson
Scholars Week
Prior to modern agriculture, the plains of North and South Dakota were once a mixed grass prairie with millions of small ponds and wetlands. These wetlands provide summer breeding habitat for countless numbers of migrating bird species. Through the work of conservation organizations and Federal agencies, many of these wetlands have been restored across the Dakotas, Prairie Minnesota, and Iowa. This project focused on locating a county in an area of critical breeding habitat that has had, thus far, limited restoration of these small wetlands and determing their extent and quality using a Geographic Information System (GIS).
The study area …
Assessing Climate Change-Induced Drought In Abu Dhabi, 2024 United Arab Emirates University
Assessing Climate Change-Induced Drought In Abu Dhabi, Salem Anwar Alblooshi
Thesis/ Dissertation Defenses
This thesis examines trends of drought related to climate change in a region within the Abu Dhabi Emirate through advanced remote sensing and statistical trend analysis techniques. To analyze long-term trends in temperature, precipitation, evapotranspiration, and groundwater levels, we use Google Earth Engine (GEE) as our primary data extraction and analysis tool, covering the years from 2002 to 2016. Evaluation of MODIS Land Surface Temperature data indicated a statistically significant warming trend each month, with rates reaching as high as 0.1°C/year. Although precipitation patterns revealed significant variability without any major trends, evapotranspiration values showed a predictable increase, especially during the …
Rabbit Control: Warren And Harbourage Destruction, 2024 Department of Primary Industries and Regional Development, Western Australia
Rabbit Control: Warren And Harbourage Destruction, Department Of Primary Industries And Regional Development, Western Australia
Biosecurity factsheets
If correctly and appropriately undertaken, the destruction of rabbit warrens, or modification of the habitat so it becomes less favourable to rabbits, can be an important and effective part of reducing the impacts of rabbits.
Destruction of warrens can improve the overall effectiveness of rabbit control programs, even though many rabbits live and shelter above-ground under bushes, and in scrub). If undertaken properly, the ripping of rabbit warrens can often provide a relatively permanent and long-term benefit. Similarly, removing or modifying other forms of rabbit-harbourage (for example, removing rock piles) can help, particularly in semi-urban areas or on smallholdings.
Rabbit Fencing To Protect Crops And Pastures, 2024 Department of Primary Industries and Regional Development, Western Australia
Rabbit Fencing To Protect Crops And Pastures, Department Of Primary Industries And Regional Development, Western Australia
Biosecurity factsheets
This factsheet outlines the use of fencing to protect crops and pasture from rabbits.
Rabbits cause an estimated loss of $217 million each year to Australian agricultural production and cause significant environmental damage. In Western Australia (WA), areas of native vegetation, particularly on sandy ridges that would otherwise be subject to wind erosion, have been retained on farms. Bush remnants are a major refuge habitat for rabbits, which can cause considerable damage to nearby pastures and crops. A measure of rabbit control can be achieved by poisoning around bush remnants in late summer or autumn, prior to seeding. To be …
Excavated Tanks (Farm Dams), 2024 Department of Primary Industries and Regional Development, Western Australia
Excavated Tanks (Farm Dams), Department Of Primary Industries And Regional Development, Western Australia
Natural resources factsheets
Guidelines and information for planning, legal requirements, design, construction and management of excavated tanks for water storage on farm.
Excavated tanks (farm dams) provide effective water storage wherever surface water run-off can be harvested for livestock, crop spraying, irrigation and domestic use on rural properties.
Excavated tanks for rainfall storage are common in the southern agricultural areas of WA.
Well-designed and constructed dams are farm assets, safe and require little maintenance.
Poor design and construction can lead to poor water harvesting and storage, excessive costs, downstream erosion and risks to property and people.
DPIRD recommends that excavated tanks should be …
Pumping Groundwater For Salinity Control In Wa, 2024 Department of Primary Industries and Regional Development, Western Australia
Pumping Groundwater For Salinity Control In Wa, Department Of Primary Industries And Regional Development, Western Australia
Natural resources factsheets
DPIRD recommends that groundwater pumping is used as part of an integrated water and salinity management program.
Groundwater pumping can lower local water tables, recover land for production and reduce the spread of local salinity or to protect high value assets at risk, such as townsites, roads or railway lines. Pump water can be discharged to safe disposal points or used on farm for desalination.
The Impact Of Rock Glaciers On Alpine Lakes, 2024 Huron University College, Canada
The Impact Of Rock Glaciers On Alpine Lakes, Chad Dickson
Undergraduate Student Research Internships Conference
This presentation details our field work in the Uinta Mountains, Utah, to collect water and sediment samples from alpine lakes adjacent to rock glaciers. These samples will be crucial to analyze the impact of climate change on alpine catchments, as these ostensibly pristine lakes are impacted by nitrate exported in glacial meltwater.
Evaluating Indoor Air Quality In Residential Environments: A Study Of Pm2.5 And Co2 Dynamics Using Low-Cost Sensors, 2024 The University of Texas Rio Grande Valley
Evaluating Indoor Air Quality In Residential Environments: A Study Of Pm2.5 And Co2 Dynamics Using Low-Cost Sensors, Kabir Bahadur Shah, Dylan Kim, Sai Deepak Pinakana, Mkhitar A. Hobosyan, Armando Montes, Amit U. Raysoni
School of Earth, Environmental, and Marine Sciences Faculty Publications and Presentations
Indoor air quality (IAQ) poses a significant public health concern, and exposures to high levels of fine particulate matter (PM2.5) and carbon dioxide (CO2) could have detrimental health impacts. This study focused on assessing the indoor air pollutants in a residential house located in the town of Mission, Hidalgo County, South Texas, USA. The PM2.5 and CO2 were monitored indoors: the kitchen and the bedroom. This investigation also aimed to elucidate the effects of household activities such as cooking and human occupancy on these pollutants. Low-cost sensors (LCSs) from TSI AirAssure™ were used in this study. They were deployed within …
Table Of Contents, 2024 China Coal Technology and Engineering Group (CCTEG)
Rock Bursts Induced By Thick-Hard Roof With Compound Key Strata: Mechanisms And Technical Modes For Prevention, 2024 CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Rock Bursts Induced By Thick-Hard Roof With Compound Key Strata: Mechanisms And Technical Modes For Prevention, Zheng Kaige, Yuan Liang, Zhang Pingsong, Wang Lintao
Coal Geology & Exploration
Objective Thick-hard roofs serve as the key factor inducing disasters such as rock bursts and mining-induced earthquakes in coal mines. These disasters are especially serious in the case of coal seam roofs with compound key strata. Hence, there is an urgent need to reveal the mechanisms behind the rock bursts induced by thick-hard roofs with compound key strata and to develop technical modes for the prevention and control of these rock bursts. Methods Using methods including physical simulation experiments on similar materials and mechanical analysis, this study developed methods for identifying roofs with compound key strata and for non-synergistic breaking …
Fracturing Characteristics Of Significantly Thick Overburden Inducing Mine Earthquakes And The Stress-Triggering Mechanisms Of The Mine Earthquakes, 2024 School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China; Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining and Technology, Xuzhou 221116, China
Fracturing Characteristics Of Significantly Thick Overburden Inducing Mine Earthquakes And The Stress-Triggering Mechanisms Of The Mine Earthquakes, Dou Linming, Cao Anye, Yang Yao, He Hu, Yang Yaoxin, Bai Xianxi, Gu Qianyue, Li Songhui, Fu Xiangchao, Gu Yingshi, Wu Zhen, Zhang Di
Coal Geology & Exploration
Objective Frequent mine earthquakes that cause surface seismaesthesia, induced by the fracturing of significantly thick overburden in deep coal mining, are identified as the most severe challenge to the efficient production of mining areas. There is an urgent need to overcome the current difficulty caused by mine earthquakes induced by significantly thick overburden, which feature high frequency and challenging prevention and control. Methods Using such mine earthquakes occurring in a certain fully mechanized mining face adjacent to goaves in the Khujirt mining area in Ordos, Inner Mongolia Autonomous Region, as an example, this study (1) analyzed the evolutionary patterns of …
Mechanisms Behind Mine Earthquake-Induced Dynamic Instability Of Thick Top Coals In High-Stresses Roadways, 2024 Key Laboratory of Safe and Effective Coal Mining, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, China
Mechanisms Behind Mine Earthquake-Induced Dynamic Instability Of Thick Top Coals In High-Stresses Roadways, Zhou Kunyou, Dou Linming, Cao Anye, Ma Yankun, Kan Jiliang, Li Jiazhuo, Ma Xiaotao
Coal Geology & Exploration
Objective Thick top coals are common in roadways excavated along the bottom of thick coal seams. Mine earthquakes along the mining face can exert dynamic loading on thick top coals in roadways, prone to induce the dynamic instability of thick top coals and even roof fall-rock burst compound disasters. Therefore, there is an urgent need to explore the mechanisms behind the dynamic instability of thick top coals in roadways under dynamic loading induced by mine earthquakes. Methods This study investigated a roadway of deep thick top coals in the Binchang mining area, Shaanxi. Specifically, this study analyzed the dynamic instability …
Mechanism Of Thrust Fault Slip Under The Disturbance Of Stress Waves Induced By Coal Mining, 2024 School of Mine Safety, North China Institute of Science and Technology, Langfang 065201, China
Mechanism Of Thrust Fault Slip Under The Disturbance Of Stress Waves Induced By Coal Mining, Zhang Ningbo, Xu Qianhai, Ouyang Zhenhua, Li Yizhe, Shi Qingwen, Qin Hongyan, Yi Haiyang
Coal Geology & Exploration
Objective The seismic sources, such as roof collapse and artificial blasting, in coal mining may induce stress waves, which will cause the surrounding faults lose its stability and thus cause the dynamic disasters such as rockbursts etc. Methods The propagation law of stress waves in the fracture structure and the evolution characteristics of friction energy under the action of stress waves were studied through dynamic photoelastic experiment, numerical simulation and theoretical analysis based on the thrust fault F16 in Henan Yima mining area. Meanwhile, the disturbance law of the location of seismic source and energy to the slip of thrust …
Advances In Research On The Evolution Of Trans-Scale Discontinuous Structures During The Creeps Of Strongly Disturbed Coals, 2024 Deep Mining and Rockburst Research Institute, CCTEG Chinese Institute of Coal Science, Beijing 100013, China; State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo 454003, China; State Key Laboratory of Intelligent Coal Mining and Strata Control, Beijing 100013, China
Advances In Research On The Evolution Of Trans-Scale Discontinuous Structures During The Creeps Of Strongly Disturbed Coals, Zhang Liang, Wang Laigui, Ren Ting, Li Xiangchun, Gao Ke, Li Haitao, Zhao Shankun
Coal Geology & Exploration
Objective and Methods Disasters associated with surrounding rocks in roadways, such as time-dependent deformation failure and creep-induced rock bursts, severely threaten deep mines in China. These disasters, coupled with the impacts of deep mining and structural changes, render it urgent to explore the evolutionary patterns of trans-scale discontinuous structures during the creeps of strongly disturbed coals. This study systematically reviews the scale effects of coals' mechanical properties, the discontinuous structures and multi-physics field effects of coals, and the long-term stability, creep evolutionary patterns, and mechanical models of coals. It highlights the close correlation between discontinuous structures (including their fractures and …
Sedimentary Environments, Mechanical Properties, And Rock Burst Risk Identification Of Overburden In Deep Mines, 2024 School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Sedimentary Environments, Mechanical Properties, And Rock Burst Risk Identification Of Overburden In Deep Mines, Qiao Wei, Cheng Xianggang, Dou Linming, He Hu, Meng Xiangsheng, Ren Yangyang, Xiao Chong, Cai Jin
Coal Geology & Exploration
Objective Disaster risk identification and prediction serve as a prerequisite for disaster control. An engineering geological environment is identified as the fundamental condition inducing dynamic disasters like rock bursts in mines. Exploring the sedimentary genetic mechanisms of engineering geological environments holds great significance for predicting rock burst risks. Methods With the Gaojiapu Coal Mine in the Binchang mining area, Shaanxi Province, as a case study, this study analyzed the engineering geological characteristics of rock masses under different sedimentary microfacies. Furthermore, it explored the deformation and failure characteristics of rocks in different sedimentary environments, along with the energy release patterns of …