• How drama in Kodiak motivated my teaching

      Fogle, Tamie Everton (2004-08)
      In order to help myself overcome several frustrations which had arisen in my secondary classroom, I began looking for teaching techniques that would motivate both myself and my students. The Kodiak Island Borough School District Inservice trainings led me to the use of drama as an instructional tool. In order to understand how drama and theatre differed, I began my research with a phenomenological study of the directorial staff for the play Peter Pan. That research showed me that I needed more information about how the drama techniques could be applied. Therefore, I conducted semi-structured depth interviews with seven teachers who had also attended the training in order to compare how they had utilized drama techniques in their classrooms. I discovered an amazing variety in the types of drama these teachers used as well as the ways that they applied their knowledge to their teaching practices.
    • How much does a man cost? A dirty, dull, and dangerous application

      Hatfield, Rebecca A.; Taylor, Karen; DeCaro, Peter; Carlson, Cameron (2017-05)
      This study illuminates the many abilities of Unmanned Aerial Vehicles (UAVs). One area of importance includes the UAV's capability to assist in the development, implementation, and execution of crisis management. This research focuses on UAV uses in pre and post crisis planning and accomplishments. The accompaniment of unmanned vehicles with base teams can make crisis management plans more reliable for the general public and teams faced with tasks such as search and rescue and firefighting. In the fight for mass acceptance of UAV integration, knowledge and attitude inventories were collected and analyzed. Methodology includes mixed method research collected by interviews and questionnaires available to experts and ground teams in the UAV fields, mining industry, firefighting and police force career field, and general city planning crisis management members. This information was compiled to assist professionals in creation of general guidelines and recommendations for how to utilize UAVs in crisis management planning and implementation as well as integration of UAVs into the educational system. The results from this study show the benefits and disadvantages of strategically giving UAVs a role in the construction and implementation of crisis management plans and other areas of interest. The results also show that the general public is lacking information and education on the abilities of UAVs. This education gap shows a correlation with negative attitudes towards UAVs. Educational programs to teach the public benefits of UAV integration should be implemented.
    • How oil prices impact the labor market: empirical evidence from Alaska

      Bocklet, Johanna; Baek, Jungho; Wright, Christopher; Little, Joseph (2016-05)
      The present paper uses a linear autoregressive distributed lag (ARDL) approach in order to test for symmetric effects of oil price changes on employment in the oil-industry and employment in non-oil industries in Alaska. The ARDL model allows for the examination of short and long-run effects of employment by changes in crude oil prices, interest rate and personal income. Using quarterly data over the period 1987-2015, the long run results show strong positive correlation of crude oil prices and oil-industry employment and negative correlation between crude oil prices and employment in the non-oil industry in Alaska, supporting the sectoral shift hypothesis. Furthermore, interest rates significantly impact employment in both economic sectors, in the short and in the long run. While a higher interest rate leads to job creation in the oil-industry, it causes job destruction in the non-oil industry.
    • How religious and spiritual information is infused throughout counselor education programs

      Conway, Kathryn; Gifford, Valerie; Renes, Susan; Ollhoff, Tim (2020-05)
      Many counseling clients want the religious and spiritual aspects of themselves acknowledged and incorporated into their therapy sessions. As such, counselors must gain competence in addressing religious and spiritual issues with clients. What is uncertain is whether counselor education programs address religious and spiritual issues consistently and adequately. The following text is a thematic literature review synthesizing research related to the question, “How is religious and spiritual information infused throughout counselor education programs?” Review of the research reveals incredible variability between counselor education programs, and a paucity of religious and spiritual content delivered to counseling students, suggesting that religious and spiritual topics must be more consistently addressed throughout counselor education programs.
    • How The Devils Went Deaf: Ethnomycology, Cuisine, And Perception Of Landscape In The Russian North

      Yamin-Pasternak, Sveta; Schwitzer, Peter (2007)
      Arctic tundra is rich mushroom country and a number of high latitude fungi species can potentially be used as food. Different regions often play host to many of the same or similar mushroom varieties. Yet, people's attitudes toward the same mushrooms---and mushrooms in general---vary widely both in temporal and geographical senses. The given work presents a study in ethnomycology---a field of inquiry concerned with human beliefs and practices associated with mushrooms, carried out in the Bering Strait area of Chukotka, Russia. Once avoided by the Native people living on the Russian and American sides of the Bering Strait, wild mushrooms are now considered to be deliciously edible among the Yupiit and Chukchi of Chukotka. In addition to its dietary contribution, mushroom gathering is also valued as a social, spiritual, and recreational activity which cultivates particular relationships between the people and the land. Prior to the influences of the mushroom-loving Russian cuisine, Yupik people in Chukotka regarded mushrooms as "devil ears," while the Chukchi largely viewed them as reindeer food unfit for human consumption. As an ethnographic study of a single commodity, this thesis examines past and present meanings of mushrooms in Chukotka, exploring local beliefs, practices, and knowledge associated with their use. It shows that the transformations in Yupik and Chukchi ideas about mushrooms are deeply connected with multiple aspects of social change taking place in Chukotka during and after the Soviet period.
    • How to disappear completely (and never be found)

      Mata, R. (2005-05)
      'How To Disappear Completely (And Never Be Found)' is a collection of six short stories that explore the theme of disappearance. The disappearance in each story works as a metaphor for the character's condition : the failure to act upon a definitive moment, the realization that everything is about to be lost, the inability to reverse an action. Another important theme that emerges is the way in which children are the unwitting victims of these characters' failures. How To Disappear Completely (And Never Be Found) uses a variety of narrative styles, from magic realism to fragmentation of stories within stories, as means of rendering the subjective reality of the characters in each story,
    • How to guide: implementing place based learning into the classroom

      Howard, Elisha (2017-12)
      New teachers to rural Alaska may have a difficult time integrating place-based education into their classroom while still using the mandated curriculum provided by their school district. Teachers may also have a hard time relating to their students because they are new to the community and culture. There are limited resources to help teachers learn how to implement place-based education into the curriculum given. Therefore, a how-to guide would be helpful to rural Alaska teachers. This how-to guide will include: Part I. Before Instruction, Part II. Adapting Instruction, Part III. Finding Resources, and Part IV. After the Lessons: Assessments.
    • Human and ecological responses to the Northern White River Ash eruption

      Smith, Holly A.; Reuther, Joshua; Bigelow, Nancy; Clark, Jamie (2020-05)
      The White River Ash northern lobe (WRAn) volcanic eruption deposited a blanket of tephra (volcanic ash) along the Yukon-Alaska border ~1625 cal BP (calibrated years before present). Currently, there has been limited investigation into the effect of this natural disaster on the environment and local hunter-gatherer populations. This research seeks to analyze and explore the potential ecological and cultural responses to the WRAn event. To address this question, paired archaeological and palynological studies bracketing the WRAn were conducted. Excavations at the Forty Mile/Ch'ëdä Dëk Territorial Historic Site in the Yukon (LcVn-2) revealed a multicomponent site including cultural deposits dating to approximately 1500 and 2000 years ago, with a band of WRAn ash separating them. The focus of the project was to identify similarities and differences in artifactual and faunal assemblages and feature types between cultural occupations pre- and post-tephra deposition that could indicate variations in site use, hunting practices, and tool manufacture. A decadal-scale pollen analysis spanning ~80 years before and after the WRAn tephra fall was conducted on a lake core collected near Eagle, Alaska, to explore the potential environmental impacts of the tephra deposition on the landscape. Results from this project suggest that the WRAn eruption did not create a prolonged negative environmental or cultural impact. At the study location, which experienced at least ~1 cm of tephra deposition, there is a prompt reoccupation of the Forty Mile Site, with multiple subsequent occupations, displaying a resilient population that was able to adapt to the fluctuating environmental surroundings. Similarly, the pollen displays a period of ~5 years of reduced influx and productivity, followed by spikes of abundance before returning to pre-eruptive comparable levels ~35 years after the WRAn. In this thesis, I argue that no hiatus in cultural occupation occurs following the WRAn tephra deposition and the archaeological assemblage displays characteristics in accordance with general cultural transitions occurring in southwestern Yukon and interior Alaskan archaeology.
    • Human impacts to fire regime in Interior Alaska

      DeWilde, La'ona (2003-12)
      A thorough analysis of human impacts on interior Alaska's fire regime demonstrates that human activities have effects in populated areas. Two approaches were used to determine impacts: I examined three regions with very different populations, and also one large region to analyze suppression, ignition, and vegetation interactions. The Fairbanks Region, with a large human population and an extensive road system, differs from two other regions with low human populations and few roads. In the Fairbanks Region, humans have impacted fire regime by causing more fires in certain fuel types and doubling the length of the fire season. The Fairbanks Region, with a higher level of suppression than the other two regions, has less area of land burn, even after controlling for fuel type and a higher number of human ignitions. In areas designated for high protection, there is less area burned and more human caused starts. For interior Alaska as a whole, human ignitions and suppression have only a minor effect on fire regime, and climate strongly influences the total area burned. However, in populated areas and areas designated for high protection, human ignitions account for most of the area burned, and less area bums overall due to suppression.
    • Human social dynamics multi agent system

      Nudson, Oralee N.; Nance, Kara; Hay, Brian; Newman, David (2009-05)
      Current political and economic events are placing an emphasis on energy production and consumption more than ever before. This leads to the necessity for continued research with power distribution systems and factors influencing system operation. The Human Social Dynamics Multi Agent System (HSDMAS) is a project contributing to the study of power distribution networks. By examining power failures as a string of related events while incorporating intelligent learning agents representing human factors, the HSDMAS takes a unique approach towards the understanding and prevention of large scale power failures by coupling a probabilistic model of load-dependent cascading failure, CASCADE, with a dynamic power systems model, OPA. The HSDMAS project focuses on improving and optimizing the performance of the CASCADE and OPA models individually, then develops an interactive multi- layer, multi-agent system modeling power transmission and human factors represented by utility optimization.
    • Human well-being in recreation: an investigation of the expectancy-valence theory

      Harrington, Andrew M. (2011-05)
      Over the past 50 years, numerous approaches exploring the recreation experience have offered a multitude of concepts and terminology, resulting in a debate over which best represent recreation behavior. This study adopts one of these approaches, the motivational approach, and explores its underpinning theory, expectancy-valence; addresses its limitations presented in the literature; and investigates the potential for the integration with other approaches. A modified analytic induction methodology was applied to address five hypotheses developed to address study questions. Longitudinal, qualitative data were collected through two separate interviews one week apart with 16 individuals that captured their thoughts regarding their recreation activities. A codebook was developed and a kappa statistic revealed an acceptable (K = 0.61 to 0.80) level of inter-coder reliability. Codes were developed based on constructs from the expectancy-valence framework prior to examining the transcripts. Evidence of these codes in the transcripts provided support for the theory. Consistent with modified analytic induction, some hypotheses were confirmed, while one was modified when evidence to the contrary was found. Further examination of the data revealed the potential for integration of other approaches.
    • Human-bear interactions in the North Slope oilfields of Alaska (USA): characteristics of grizzly bear sightings and use of infrared for bear den detection

      Pedersen, Nils J. S.; Brinkman, Todd J.; Shideler, Richard T.; Brainerd, Scott; Lindberg, Mark (2019-05)
      Minimizing unsafe human-bear (Ursus spp.) interactions in the North Slope oilfields of Alaska (USA) requires knowledge of where they occur and methods to prevent them. My research goals were to characterize the spatial and temporal dynamics of grizzly bear (U. arctos) sightings during the non-denning season around industrial infrastructure in the North Slope oilfields over the past 25 years (Chapter 2), and to evaluate the efficacy of forward-looking infrared (FLIR) systems to detect grizzly bears and polar bears (U. maritimus) in their winter dens (Chapter 3). I used reports (n = 2,453) of summer grizzly bear sightings collected by oilfield security officers from 1990-2014 to estimate how the spatial distribution of sightings for food-conditioned (FC) and natural food (NF) bears changed following restriction of bear access to anthropogenic food waste (to be known hereafter as "treatment") in 2001. I found that concentrations of FC bear sightings shifted toward the landfill with medium-low effect (Hedges' g = 0.41), one of the only remaining areas with available food waste, after the treatment. The treatment also decreased NF bear sighting distances to landfill with low effect (Hedges' g = 0.15). My findings suggested that grizzly bear access to food waste should be prevented to minimize negative human-bear interactions and that an active bear reporting system facilitates adaptive management of human-bear interactions. During the winter, grizzly bears and pregnant female polar bears enter dens in areas that overlap anthropogenic activity. FLIR techniques have been used to locate occupied dens by detecting heat emitted from denned bears. However, the effects of environmental conditions on den detection have not been rigorously evaluated. I used a FLIR-equipped Unmanned Aircraft System (UAS) to collect images of artificial polar bear (APD) and grizzly bear (AGD) dens from horizontal and vertical perspectives from December 2016 to April 2017 to assess how odds of detection changed relative to den characteristics and environmental conditions. I used logistic regression to estimate effects of 11 weather variables on odds of detection using 291 images. I found that UAS-FLIR detected APDs two times better than AGDs, vertical perspective detected 4 times better than horizontal, and that lower air temperatures and wind speeds, and the absence of precipitation and direct solar radiation increased odds of detection for APDs. An increase of 1°C air temperature lowered the odds of detection by 12% for APD, and 8% for AGDs, but physical den characteristics such as den snow wall thickness determined detectability of AGDs. UAS-FLIR surveys should be conducted on cold, clear days, with calm winds and minimal solar radiation, early in the denning season. UAS-FLIR detectionof bear dens can be effective but should be confirmed by a secondary method.
    • A humble guest: a phenomenological exploration of success and competence in rural Alaskan mental health care

      Herman, Daniel John; Gifford, Valerie M.; Whipple, Jason; David, Eric John; Swift, Joshua (2018-12)
      Objective: Rural communities in Alaska face a long list of mental health disparities that are exacerbated by the other challenging factors inherent within the rural context. Rural Alaskan mental health care providers are faced with the tremendous task of providing clinically and culturally competent care to underserved and marginalized populations, with limited personal and professional resources, all while balancing the needs of the community, their own personal boundaries, and the pressure of remaining accountable to the larger system of professional ethics and guidelines. The aim of this study was to explore, identify, and understand from the perspective of rural Alaskan providers what it means to be successful and competent mental health care providers in rural Alaska. The ultimate goal of this study was to develop a deeper understanding of what being successful and competent means from the perspective of providers who have been successful in rural Alaskan practice. Methods: This study utilized an exploratory qualitative methodology grounded in the interpretive/constructivist paradigm. Semi-structured interviews were used to explore the perspectives of 12 mental health providers who have practiced successfully and competently with rural Alaskan patients. Furthermore, a phenomenological-hermeneutic approach was applied in order to work collaboratively with participants to reach a deeper understanding of mental health care success and competence in a rural Alaskan context. Results: Ten contextual themes and 27 subthemes emerged from the interviews that illuminate the experience of success and competence as experienced by rural Alaskan mental health care providers. The implications of this study serve to deepen the current understanding of what it means to practice in rural Alaska with communities and Indigenous people. Furthermore, the findings provide a culture and context specific understanding of success and competence that will help current providers, employers, and communities to better serve rural Alaskan people. The findings contribute to the literature by promoting a salient perspective of practice that is within a context of mental health that is generally disregarded, overlooked, and rarely considered.
    • Humpback whale (Megaptera novaeangliae) entanglement in fishing gear in northern southeastern Alaska

      Neilson, Janet L. (2006-05)
      The prevalence of non-lethal entanglements of humpback whales (Megaptera novaeangliae) in fishing gear in northern southeastern Alaska (SEAK) was quantified using a scar-based method. The percentage of whales assessed to have been entangled ranged from 52% (minimal estimate) to 71% (conditional estimate) to 78% (maximal estimate). The conditional estimate is recommended because it is based solely on unambiguous scars. Eight percent of the whales in Glacier Bay/Icy Strait acquired new entanglement scars between years, although the sample size was small. Calves were less likely to have entanglement scars than older whales and males may be at higher risk than females. The temporal and spatial distribution of commercial fisheries is complex and difficult to correlate with these results. The percentage of whales with entanglement scarring is comparable to the Gulf of Maine where entanglement is a substantial management concern. Consequently, SEAK humpback whale-fisheries interactions may warrant a similar level of scrutiny.
    • Humpback whale habitat use patterns and interactions with vessels at Point Adolphus, Southeastern Alaska

      Koehler, Nicole (2006-12)
      Humpback whales at Point Adolphus, in southeastern Alaska, are faced with the challenge of maximizing their energy gain from feeding and minimizing energy losses that can occur due to disturbance by vessel traffic. Point Adolphus is unique because of abundant prey resources that attract high concentrations of humpback whales during the summer and high levels of vessel activity. Using scan sampling and focal behavior observation sessions data were collected from an elevated shore station on the northern coast of Chichagof Island in 2001. Humpback whale numbers peaked during early ebb tide. Whales were distributed west during ebbing tides and east during flooding tides. During flood tides, humpback whales exhibited non-directional movement. Differences in humpback whale numbers, distribution and movement patterns in relation to tide appeared related to small-scale fronts and headland wake effects associated with Point Adolphus. Overall, humpback whale swimming speeds were faster when the number of vessels present was greater and distance to the nearest vessel was smaller. However, responses of individual whales differed. Humpback whales at Point Adolphus appear to have developed strategies to exploit predictable times to feed which are tidally-induced and practice short-term avoidance strategies that may reduce the effects of vessel traffic.
    • Humpback whales and humans: a multi-disciplinary approach to exploring the whale-watching industry in Juneau, Alaska

      Teerlink, Suzanne F.; Horstmann, Larissa; Witteveen, Briana; Mueter, Franz; DeMaster, Doug; Beaudreau, Anne (2017-05)
      A booming whale-watching industry in Juneau, Alaska is leading to complicated resource management challenges. Juneau's growing commercial whale-watching industry includes over 60 vessels and generates more than $25 million in annual revenue. As this industry has increased, so too have concerns for the welfare of humpback whales (Megaptera novaeangliae) exposed to this vessel traffic. However, we lack a fundamental understanding of long-term impacts, if any, that vessel disturbance has on humpback whales. Further, we have insufficient data on local abundance and seasonal attendance of humpback whales that are necessary to detect potential future changes. The aim of this project is to investigate Juneau area humpback whales and their interactions with whale-watching tourism to set a foundation for sustainable management of this resource and industry. To reach this objective, three studies were employed. 1) Methods for monitoring humpback whale population parameters through a citizen science program were developed and tested. Photo-identification data were collected on whale-watching platforms and compared to data from dedicated surveys to objectively evaluate the citizen science data collection methods and identify biases. 2) Physiological markers were evaluated for signs of a chronic stress response in blubber of Juneau-area humpback whales compared with humpback whales from other areas in Alaska with far less vessel traffic. The concentrations of several steroid hormones, including cortisol, were measured from biopsy samples and used to infer a relative cumulative stress response in whales exposed to Juneau's tourism fleet. 3) Community perceptions toward Juneau's whale-watching industry and humpback whale management were collated to consider stakeholder concerns and suggestions for local humpback whale management. Participants were given the opportunity to share their perspectives on humpback whale welfare, community considerations and concerns, and recent and proposed management changes that affect the whale-watching industry. I found that citizen science data can produce reliable estimates of abundance, especially with sufficient effort. I did not find evidence for increased stress response in Juneau-area humpback whales and argue that this indicates habituation in these animals. Respondents in our survey generally supported Juneau's whale-watching industry, but expressed concerns for the vessel crowding and the welfare of humpback whales in this area. This project combines multiple scientific disciplines to tackle the initial steps necessary in understanding the complex interaction between humans and humpback whales near Juneau, and in making management decisions that ensure a sustainable future for Juneau's humpback whales and the whale-watching industry that relies on them.
    • Hunters like skewness, not risk: evidence of gambling behaviors in the Alaska hunting permit lottery

      Lane, Brock; Little, Joseph; Greenberg, Joshua; Baek, Jungho (2018-05)
      In Alaska, hunting permits are distributed by traditional lottery. The absence of a preference point system means that applicants have little invested in their applications, and there are a variety of fallback hunting opportunities. Not unlike a jackpot-style state lottery, the cost to play is low relative to the potential prize winnings. These factors may cause risk-averse or risk-neutral individuals to exhibit a preference for positive skewness in their bets. Analysis in this paper is focused on four prevalent game species: moose, dall sheep, mountain goat, and bison. Pooled Ordinary Least Squares regression models were constructed to predict permit application levels as a function of various hunt characteristics, qualities, and restrictions. Permit descriptions are provided to applicants in a published document called the drawing supplement, which is the primary source of data for this study. Additional hunter-reported data is obtained from the Alaska Department of Fish and Game website. A comparison of calculated permit values and private ranch hunting opportunities validates many of the observations drawn from the models. Permit values are also used to fit a cubic model of bettor utility. Even when awarded prizes are not monetary, applicants exhibit a preference for positive skewness and aversion from risk that is typically associated with gambling.
    • Hybrid Electric Power Systems In Remote Arctic Villages: Economic And Environmental Analysis For Monitoring, Optimization, And Control

      Agrawal, Ashish N.; Wies, Richard (2006)
      The need for energy-efficient and reliable electric power in remote arctic communities of Alaska is a driving force for research in this work. Increasing oil prices, high transportation costs for fuels, and new environmental standards have forced many utilities to explore hybrid energy systems in an attempt to reduce the cost of electricity (COE). This research involves the development of a stand-alone hybrid power system model using MATLABRTM SimulinkRTM for synthesizing the power system data and performing the economic and environmental analysis of remote arctic power systems. The hybrid model consists of diesel electric generators (DEGs), a battery bank, a photovoltaic (PV) array, and wind turbine generators (WTGs). The economic part of the model is used to study the sensitivity analysis of fuel cost and the investment rate on the COE, the life cycle cost (LCC) of the system, and the payback time of the system. The environmental part of the model calculates the level of various pollutants including carbon dioxide (CO2), nitrogen oxides (NOx), and the particulate matter (PM10). The environmental analyses part of the model also calculates the avoided cost of various pollutants. The developed model was used to study the economics and environmental impacts of a stand-alone DEG system installed at the University of Alaska Fairbanks Energy Center, the wind-diesel-battery hybrid power system installed at Wales Village, Alaska, and the PV-diesel-battery hybrid power system installed at Lime Village, Alaska. The model was also used to predict the performance of a designed PV-wind-diesel-battery system for Kongiganak Village. The results obtained from the SimulinkRTM model were in close agreement with those predicted by the Hybrid Optimization Model for Electric Renewables (HOMER) software developed at National Renewable Energy Laboratory (NREL).
    • Hydroclimate in Eurasia from the Arctic to the Tropics

      Majhi, Ipshita; Bhatt, Uma S.; Zhang, Xiangdong; Molders, Nicole; Walsh, John; Krishnamurthy (2018-05)
      Hydrometeorology in Eurasia connects the Arctic with lower latitudes through exchanges in moisture and teleconnections influencing climate variability. This thesis investigates the role of dams on the Kolyma basin, of precipitation and temperature change on a pristine permafrost lined basin of the Yana, and of changing snow cover over Eurasia on the Indian Monsoon. These three pieces of work illustrate different aspects of a changing climate that impact Eurasian hydrometeorological variations. The Kolyma is one of the large rivers which flows into the Arctic Ocean where there has been a large winter increase and summer decrease in flow over the 1986-2000 period. Winter months are characterized by low flow while summer months by high flow. Reservoir regulation was identified as the main cause of changes in the discharge pattern, since water is released in winter for power generation and stored in summer for flood control. The overall discharge to the Arctic Ocean has decreased for Kolyma basin, despite the increase during winter. This study documents how human activities (particularly reservoirs) impact seasonal and regional hydrological variations. The Yana Basin is a small pristine basin that has experienced minimal human impact and is ideal for investigating the role of climate variability on discharge. The precipitation discharge and temperature discharge analysis for Ubileinaya suggests that increased precipitation and higher temperatures resulted in higher discharge, but other parameters also come into play since greater precipitation does not always yield higher discharge. Overall our analysis for this station has increased our understanding of natural basins and how the climate variables like precipitation and temperature play a role. Recent increases in May-June Indian monsoon rain fall were investigated in the context of Eurasian snow cover variations since the onset of the monsoon has long been linked to Himalayan snow cover. Himalayan snow cover and depth have decreased and this study argues that this is the driver of increased rainfall during May-June, the pre-monsoon and early monsoon period. In addition, there has been an increase in snow water equivalent in Northern part of Eurasia and decrease in Southern part, suggesting that the anomalies are large-scale. Storm track analysis reveals an increase in the number of storms in northern and a decrease in southern Eurasia. The large-scale Eurasian snow increases have been shown by other studies to be linked to Arctic sea ice decline. The direct linkage between fall Arctic sea ice decline and an increase in May-June Indian monsoon rainfall is proposed in this work but the exact climate mechanism is tenuous at this point. This study is focused on understanding changing Arctic rivers and the connection of the Arctic with the Indian monsoon. Our study has shed some light into the connection between the Arctic and the tropics. This study could benefit from modeling study where we could have case study with and without sea ice to understand better how that could impact the monsoon and the hydrological cycle in the present and the future. Better understanding of the mechanism would help us take steps towards better adaptation policies.
    • Hydrodynamics of downstream pointed guidevanes: a case study of the Hess Creek meander bend realignment

      Lai, Alexandre W. (2011-12)
      The hydrodynamics of downstream pointed guidevanes installed to realign an eroding meander bend upstream of the Trans- Alaska Pipeline bridge is studied. The bridge is located at Hess Creek, 137 km north of Fairbanks, Alaska. Effect of the downstream pointed vanes on bed form, erosion, longitudinal and transverse slopes, three dimensional velocity profiles, flow patterns, and other hydraulic parameters for high and low flows are compared and analyzed. Six years after installation of the vanes the realigned thalweg remains in its original design location. The longitudinal bed profile changed from a dominant continuous pool typical of natural meander bends on gravel stream beds to a series of pool riffles. However, there is minimal change in maximum scour depth between post and pre installation of the vanes. Secondary or transverse current patterns which cause scour or erosion on the outer bank are severely disrupted due to interference caused by the vanes. There is a consistent weak counter current in reaches between the vane stems due to flow separation caused by expansion of flow area. This condition was more dominant during low flows when the vanes were not completely submerged. From the tip of the vanes to the inner bank a more dominant transverse and streamwise current was measured. Location of the original eroding outer bank remains unchanged since installation of the vanes. This indicates that the vanes have to this point effectively realigned the meander bend and arrested additional lateral movement of the meander.