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      Daley, Steven (2021-04)
      Ice roads are a common type transportation corridor in regions of the circumpolar north that traverse frozen rivers, lakes, and other bodies of water. This report reviews the existing literature that is relevant to the design, construction, operation, and maintenance of ice roads in the circumpolar north. It begins with a compact review of ice formation in river and lakes with an emphasis on those aspects that are relevant to ice roads: ice cover formation and growth, the various types of ice, ice decay, and breakup. Next it addresses bearing capacity, the ability of the ice cover to support a load. The current approach for determining the bearing capacity combines an approach based on elastic plate theory with a conservative failure criterion and uses empirical coefficients based on observations. An important point here is that selection of a coefficient value is, in effect, selection of a risk level for use of the ice road. The approaches used by Canadian provinces and territories is reviewed along with their approach to the range of risk levels. The construction of ice roads is then described. Ice road construction involves setting the ice road widths, increasing the ice cover thickness, if necessary, through snow clearing and flooding of the ice cover, and installing signage. The hazards that can affect the integrity of the ice road and safe operation of vehicles, and the controls that can be put into place to remediate or prevent the hazards from occurring are then discussed. Finally, an ice road risk management framework is described. The Risk Management Framework allows the operators of the ice road a means of balancing the needs and requirements of the ice road users and the resources available to the operators at an acceptable risk level.
    • Design and Operation of Ice Roads

      Daley, Steven; Connor, Billy; Garron, Jessica; Stuefer, Svetlana; Belz, Nathan; Bjella, Kevin (2022-12)
      This manual provides for the safe and efficient design, construction, maintenance, and operation of ice roads over freshwater. As such, it provides the parties responsible for the ice road guidelines for ensuring the safe operation of the ice road including route selection, minimum ice thicknesses, repair strategies, maximum vehicle weights and speed, and proper signage. The information provided in the manual represents best practices compiled from existing literature and from those who have experience working on ice roads. While every scenario cannot be foreseen, the information contained in this manual should provide sufficient knowledge to extrapolate safe solutions which are not explicitly covered here.
    • Alaska Earthquake Center Quarterly Technical Report October-December 2023

      Ruppert, Natalia (2024-02-16)
      This series of technical quarterly reports from the Alaska Earthquake Center (AEC) includes detailed summaries and updates on Alaska seismicity, the AEC seismic network and stations, field work, our social media presence, and lists publications and presentations by AEC staff. Multiple AEC staff members contribute to this report. It is issued in the following month after the completion of each quarter Q1: January-March, Q2: April-June, Q3: July-September, and Q4: October-December. The first report was published for January-March, 2021.
    • 2023 Alaska Seismicity Summary

      Ruppert, Natalia; McFarlin, Heather (2024-02-01)
      The Alaska Earthquake Center reported 45,546 seismic events in Alaska and neighboring regions in 2023. The largest earthquake was a magnitude 7.2 event that occurred on July 16 in the Alaska Peninsula region. It was a late aftershock of the 2020 M7.8 Simeonof Earthquake. Other strong earthquakes include the October 16 M6.4 and December 21 M6.1 earthquakes in the Andreanof Islands region of the Aleutian Islands. The largest earthquake in mainland Alaska, magnitude 5.4, occurred in the lower Cook Inlet region on March 19. We continued to monitor ongoing activity within the 2018 M7.1 Anchorage, 2018 M6.4 Kaktovik, 2018 M7.9 Offshore Kodiak, 2020 M7.8 Simeonof, and 2021 M8.2 Chignik aftershock sequences, the Purcell Mountains earthquake swarm, and the Wright Glacier cluster northeast of Juneau. All aftershock sequences continued to slow down compared to the previous years.
    • Laboratory and field testing of the Knudsen bowl concentrator

      Mark Anthony, Michael Richard; Johansen, Nils I.; Walsh, Daniel E.; Bandopadhyay, Sukumar (1995-08)
      During 1985 and 1986 both laboratory and field test work were conducted to study the operating parameters of the Knudsen bowl concentrator. In the past, some miners have attempted to use these bowls in Alaska, but have not been able to operate them profitably, because of the lack of accurate operating information. This study carefully examined different operating parameters of the Knudsen bowl and their effect on bowl capacity and recovery of gold. The results of the laboratory study were field tested at EVECO’s placer gold operation near Fox, Alaska. The testing showed that for a continuous feed operation the recovery of 48x65 mesh gold decreases when the feed size is over 1/8 inch or the feed rate is over 2 cubic yards per hour. The Knudsen bowl's operating characteristics would make it a logical choice as a secondary concentrator.
    • Aquatic habitat of the Tiekel River, southcentral Alaska, and its utilization by resident Dolly Varden (Salvelinus malma)

      Martin, Donald C. (1988-05)
      The Tiekel River is a third order stream in southcentral Alaska and contains stream-resident Dolly Varden (Salvelinus malma) that are small in size. The purpose of this project was to compile baseline aquatic habitat data, determine which habitats were the most important to the Dolly Varden and should be protected from future development, and develop management recommendations. Habitat data suggested that the Tiekel River drainage contained a wide variety of habitats that could fulfill the life requirements for a number of fish species. Habitat suitability index graphs were constructed for the important habitat variables and should be used in the planning of future habitat alterations to assure that habitat quality does not suffer. The beaver ponds were found to have a greater probability of producing large fish than the stream habitats. Fish size was positively correlated with August water temperatures and chlorophyll a concentrations.
    • Growth patterns of juvenile sockeye salmon in different thermal environments of Alaskan lakes

      Edmundson, Jim A. (1997-12)
      Rearing conditions imposed on juvenile salmonids in lakes are important determinants of freshwater growth patterns. In Alaska, sockeye salmon (Oncorhynchus nerka) nursery lakes exhibit a wide range in thermal characteristics. Compared to clear lakes, stained lakes are warmer and have longer growing seasons, whereas glacial lakes are colder and have shorter growing seasons. In stained lakes, a shallow thermocline restricts most of the heat to the surface layers. Deep mixing in glacial lakes, concomitant with meltwater intrusion, keep much of the water column near 4 °C. Mean depth accounts for 77% of the among-lake variation in the seasonal average water temperature (TS). Length of growing season is dependent on latitude and altitude; however, water temperature is not. Taken together, the factors TS, zooplankton biomass, and sockeye fry density accounted for 70% of the variation in age-1 sockeye smolt size. This limnological information can be included in stock-recruit models of sockeye salmon to improve assessments for management.
    • Effects of calcium magnesium acetate on small ponds in interior Alaska

      Rea, Caryn L. (1986-09)
      Deicing winter roads with chlorides has been common practice in northern areas. Corrosion of vehicles, structures, and pavements has resulted in damage, and roadside vegetation and public water supplies have been severely impacted by heavy salt usage. Calcium magnesium acetate (CMA) was identified as a promising alternative to chloride salts. This research focused on the effects on planktonic algae and bacteria in small ponds, to help assess the environmental acceptability of CMA in Alaska. The most serious consequence resulting from CMA was a dissolved oxygen concentration decrease, partly attributable to increased bacteria populations utilizing oxygen during degradation of acetate. Algal biomass recovered toward the end of the summer indicating that the algae may be utilizing some of the carbon dioxide being released by the bacteria. Rapid turnover times of acetate by bacteria in the fall and continued low dissolved oxygen indicated that some of the acetate was being recycled.
    • Seasonal changes in body mass and composition of northern red-backed voles (Clethrionomys rutilus) in interior Alaska

      Zuercher, Gerald Lawrence (1995-12)
      Northern red-backed voles (Clethrionomys rutilus) undergo a pronounced annual cycle in body mass: highest in summer, lowest in winter. I trapped voles throughout 1994 to determine how body composition and relative size of body components contributed to this cycle. Seasonal changes in body mass were primarily due to changes in body water and lean dry matter. Total body fat was low throughout the year, peaking in spring and early summer. Relative ash content was lowest in early summer. Most body components declined in dry mass and percent water during autumn, with skeletomuscular components contributing most to loss of body mass. Most body components declined in proportion to declines in body mass, but a few components declined proportionally greater than or less than body mass. Total Body Electrical Conductivity (TOBEC) of live voles explained 94% of the variation in lean mass and body water, but accuracy of fat estimates was poor.
    • Dynamics of a super-population of dolly varden in the Chiniak Bay system, Kodiak Island, Alaska

      Whalen, Mary E. (1993-05)
      A weir was operated at Buskin Lake, Kodiak Island, Alaska in the spring of 1990, 1991 and 1992 to study the stock structure of a super­population of Dolly Varden (Salvelinus malma) in Chiniak Bay. In 1991, Jolly-Seber estimates of abundance (60,585) and survival (29.3%) were higher than the weir estimates of 30,725 and 6.3%. Growth parameter estimates were 0.23 for the Brody coefficient and 522 mm as the largest fish in the population. Age 4-7 fish dominated the spring emigration from Buskin Lake. Dolly Varden found in the fall at the American and Olds rivers and Buskin Lake constitute the main spawning stocks for the Chiniak Bay super-population at 3,375, 2,669 and 3,711 fish respectively in 1991. A dynamic pool model used in conjunction with Relative Stock Density was effective in detecting increases in length-specific exploitation of larger fish, but not for detecting increasing fishing mortality in the mature stock.
    • Effects of military overflights on habitat use and selection by female Dall's sheep, Yukon-Tanana uplands, Alaska

      Wendling, Bradley R. (2008-12)
      "My objective was to assess the potential effects of military overflights on home range size, movement rates, habitat use, and habitat selection of female Dall's sheep (Ovis dalli) during 2-week sequential periods, April-July, 1999-2002. I examined sheep in 2 study areas overlain with designated military training airspace within the Yukon-Tanana uplands, Alaska. I examined the effects of study area, year, and sequential time period on: 1) mean home range size, 2) mean minimum hourly distance traveled by sheep, and 3) mean use and selection ratios for the habitat variables of elevation, slope, terrain ruggedness, aspect, and landcover class. Mean number of daily military sorties within sequential periods was used as a covariate in all analyses. I assessed habitat selection at 3 successive spatial scales defined as: 1) the regional geographical range of female Dall's sheep in the Yukon-Tanana uplands, 2) study areas (defined as the distribution of sheep within a localized area), and 3) selection within individual 2-week home ranges. Sheep home range size, movement rates, habitat use and selection ratios at the scale of region and study area differed between study areas, among years within study areas, and among sequential time periods within years within study areas, but did not vary in relation to military overflight intensity. I detected an effect of sorties on selection ratios at the home range scale; however, sorties explained <4% of the residual variation in these variables. I conclude that increases in intensity of military training operations during Major Flying Exercises (MFE's) over the Yukon-Tanana uplands were a relatively insignificant source of variance in activity and habitat use compared to the effects of seasons, years, and study areas"--Leaf iii
    • Human impacts on brown bears at Pack Creek, Admiralty Island, Alaska

      Warner, Susan H. (1987-05)
      Human disturbance of brown bears (Ursus arctos) was studied at Pack Creek on Admiralty Island in Southeast Alaska during 1983 and 1984. The Pack Creek watershed is closed to bear hunting. Use of the area by bear-watchers is increasing. Instantaneous scan sampling was used to observe bears at a control area with negligible human activity and at the popular Pack Creek area. Six bears were radio-collared to assess movements away from Pack Creek. Bears were crepuscular in the two areas. Individuals that were highly tolerant of visitors used the Pack Creek area during the mid-day period of high visitor use more than other bears. Over 80% of the observations of Pack Creek bears were of females, suggesting that visitor use may differentially affect sexes. Food-conditioned bears showed boldness that could cause undesirable incidents. Except for occasional sallies, Pack Creek females remained within the watershed. Males frequented several watersheds.
    • Effects of placer gold mining on stream macroinvertebrates of interior Alaska

      Wagener, Stephen Mitchell (1984-12)
      Placer gold mining is an economically and politically important industry in Alaska which can have major impacts on the water quality of streams. To determine the effect of placer mining on benthic macroinvertebrates we determined water quality characteristics and sampled benthic invertebrates in nine hydrologicalIy similar and proximally located streams. Sampled streams ranged from unmined control streams to heavily mined streams. Placer mining caused increases in turbidity, settleable solids, percent substrate embeddedness, nonfilterable residue, and total recoverable arsenic, lead, zinc, and copper. Placer mining decreased invertebrate density and biomass. Substrate embeddedness and turbidity were the best predictive descriptors of reduced invertebrate density and biomass. Invertebrate communities in mined streams usually contained higher proportions of collector-gatherers, and lower proportions of crawlers, shredders, filter-feeders, predators, and oligochaetes compared to unmined streams.
    • Photosynthetic response of phytoplankton to changing light intensity in a southcentral Alaskan lake

      Vaught, Kyle Douglas (1989-12)
      Little fresh-water work has been done (compared with published ma­rine studies) using photosynthesis-irradiance (P-I) curves to determine photosynthetic response of natural assemblages of phytoplankton to light above and below thermal stratification structures. Limnological data including physical, chemical, and algal taxonomy and biomass were collected through the summers of 1985 and 1986 at Wasilla Lake, Alaska (approximately 61oN., 148oW.). Algal photosynthesis­irradiance relationships were also determined through the summer of 1986 by means of P-I curves. P-I curve light-limited initial slope (a) was ≈2.5 times higher in phytoplankton populations at 6 m than those in the wind-mixed zone when populations were separated by thermal stratification. Wasilla Lake’s trophic status was estimated to fall between mesotrophic and eutrophic classifications. Phytoplankton in Wasilla Lake were found to require approximately 4-5 days to best adapt to a changing light environment.
    • The morphology and chemistry of two willow species in relation to moose winter browsing

      Suter, Suzanne M. (1992-12)
      This study examines the interaction between moose (Alces alces gigas) and winter dormant willows (Salix alaxensis and Salix pulchra) in Alaska, emphasizing the impact of moose browsing on the forage produced by willow. In a two year field study, plant responses were examined with clipping treatments designed to simulate browsing by moose. The plant responses examined included biomass production, plant architecture, and concentration of plant tannins. Forage selection by moose in the study area is also addressed. Results suggest that a plant response of increased growth, decreased chemical defense, and redistribution of new biomass may explain the pattern of repeated browsing of plants by moose. The responses of clipped plants indicate that moose improve the quality of their willow hosts by browsing and repeated browsing negatively affects carbon reserves of willows. Among and within plant variation in tannin content was also examined among 5. alaxensis trees. Observations are related to within and among tree measurements of growth rate.
    • Marbled murrelet distribution and abundance in relation to the marine environment

      Speckman, Suzann G. (1996-08)
      I examined the effects of the physical variables season, time of day, tide stage, sea surface temperature, and weather and the biological variables phenology and productivity on Marbled Murrelet (Brachyramphus marmoratus) abundance and distribution in Auke Bay and Fritz Cove, Alaska. I surveyed murrelets daily from the shore and a small boat from May through August, 1992 and 1993, and evaluated the impacts of murrelet abundance patterns on a monitoring strategy. I also examined the breeding biology, behavior, and social structure of Marbled Murrelets in an effort to gauge the effects of declining populations on their daily activities, such as foraging and courtship behavior of adults, and foraging strategies of juveniles. I found significant effects of year, season, time of day, and tide stage on Marbled Murrelet numbers at sea that have important implications for designing monitoring surveys to assess changes in Marbled Murrelet populations in Alaska and elsewhere.
    • Distribution, abundance, and quality of forage within the summer range of the central Arctic caribou herd

      Smith, Michael D. (1996-12)
      Distribution, abundance, and quality of summer forage available to caribou (Rangifer tarandus granti) of the Central Arctic Herd were determined in July and August, 1989 -1990. Plant cover, an index of available biomass, was measured at three sites within 50 km of the arctic coast. In general, plant cover increased with distance from the coast. Cover of forbs and evergreen shrubs was higher at inland sites (P < 0.001), whereas cover of willows (Salix spp.) was highest at the coastal site (P < 0.001). Higher plant cover inland is largely attributable to a greater proportion of drier habitats. Differences in forage quality among sites, however, were small and inconsistent. I conclude that by feeding inland during insect-free periods, caribou realize a net energy benefit, because of higher plant biomass, higher proportion of drier habitat, and greater species diversity than coastal areas.
    • Evaluation of Arctic grayling enhancement: a cost per survivor analysis

      Skaugstad, Calvin Loren (1989-05)
      Age-O Arctic grayling Thymallus arcticus were stocked as sac fry and fingerlings in lakes in interior and south central Alaska to evaluate cost per survivor at age 1. When sac fry, 4-g, and 6-g fingerlings were stocked in the same lakes in 1986, estimates of the mean rate of survival at age 1 were 0.08, 0.63, and 0.75. The differences were significant. The mean costs per survivor at age 1 were $1.58, $0.24, and $0.21. The differences were significant between sac fry and both sizes of fingerlings. However, the difference was not significant between 4-g and 6-g fingerlings. When sac fry and 4-g fingerlings were stocked in different lakes in 1986 and again in 1987, estimates of the mean rate of survival to age 1 were 0.11 and 0.34. The difference was significant. The mean costs per survivor at age 1 were $0.82 and $0.70. The difference was not significant. I recommend stocking 4-g fingerlings because they require less rearing in a hatchery than 6-g fingerlings and the cost per survivor is usually less than that for sac fry.
    • Effects of placer mining sedimentation on Arctic graying of interior Alaska

      Simmons, Rodney C. (1984-05)
      During summer 1982 and 1983, I assessed the effects of placer mining sedimentation on Arctic grayling, Thymallus arcticus, in the headwaters of the Birch Creek and Chatanika River drainages, northeast of Fairbanks, Alaska. In each drainage I compared the differences between two streams near their confluence, one that was undisturbed and one with mining activity upstream. Although many age-0 and adult grayling used unmined streams for summer habitat, I found no grayling in the mined streams except during periods of migration. Apparently, grayling consistently chose clearwater streams for summer residence. Caged fish studies demonstrated that if grayling could not escape from streams carrying mining sediments, they would suffer direct, chronic effects, including gill damage, dietary deficiencies, and slowed maturation. The indirect effects of sedimentation on grayling populations, through loss of summer habitat for feeding and reproduction, are more severe than the direct ones.
    • Seasonal distribution and winter habitat use by Sitka black-tailed deer in the Prince William Sound region, Alaska

      Shishido, Neil (1986-05)
      Intensity of winter use of a variety of forest stands by deer (Odocoileus hemionus sitkensis) was measured. Information on vegetation, timber type, and topography was collected to find relationships between deer use and habitat variables. Seasonal use of forest stands by deer is best described in terms of: basal area of trees, amount of deer forage (Vaccinium spp. and Coptis aspleniifolia)r deviation in crown closure, and timber volume. Information from radio-collared deer indicated high use of forest habitat, particularly during winter. Alpine areas received more use than any other habitat during summer. South-facing slopes were used more often than other aspects across all seasons. Average winter home range size was 160 ha, significantly smaller than the spring average (282 ha). Most radio-collared deer made seasonal elevational movements within a single drainage. Retention of high timber volume, old growth forest is recommended to maintain preferred deer habitat in Prince William Sound.