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At sites where petrochemical releases have occurred comparatively recently (i.e., over the last 20 years), explicit age-dating is a viable approach. However, differentiating among multiparty contamination at sites with several decades of history may mandate a different allocation strategy, especially when there is an uncoordinated body of environmental data. At a location where a refinery operated for 11 months during World War II, and which has been used as a fuel distribution terminal over the ensuing 60 years, regulatory interest was triggered in 1997 when a sheen was detected discharging into the adjacent Yukon River. Our investigation combined disparate forensic tools with data visualization software to establish...
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According to the Koppen -Geiger climate classification, Hokkaido and central to southern Alaska are located at near southrn and northern borders of the subarctic region, respectively. River basins in Hokkaido and Alaska receive similar climatological and hydrological conditions of summer to autumn rainfall, winter snowfall and spring snowmelt. Here, hydrological characteristics of the Saromabetsu river basin (area, 277.0 km super(2)) and the Oikamanai river basin (area, 62.0 km super(2)) in Hokkaido are compared with those of the Tanana river basin (area, 6.6310 super(4) km super(2)) in Alaska. Hourly time series of river discharge, Q, and suspended sediment concentration, C, in runoff events offers the relationship...
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The characteristics of sediment discharge in the Yukon River, Alaska were investigated by monitoring water discharge, water turbidity and water temperature. The river-transported sediment, 90 wt.% or more, consists of silt and clay (grain size less than or equal to 62.5 mum), which probably originated in the glacier-covered mountains mostly in the Alaska Range. For early June to late August 1999, we continuously measured water turbidity and temperature near the estuary and in the middle of Yukon River by using self-recording turbidimeters and temperature data loggers. The water turbidity (ppm) was converted to suspended sediment concentration (SSC; mg/l) of river water, using a relation between simultaneous turbidity...
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Disinfection by-products (DBP) are formed when natural organic matter (NOM) in water reacts with a disinfectant, usually chlorine. DBPs are a health risk element and regulated under the Safe Drinking Water Act. A study was conducted to evaluate the characteristics of NOM that contribute to DBPs in 17 different drinking water systems in Alaska. In order to determine the nature of the organic matter contributing to DBPs, DBP formation potential was compared with standard water quality parameters such as UV-254, color and dissolved organic carbon (DOC), as well as pyrolysis-gas chromatography/mass spectrometry (GC/MS). Results showed strong correlations between UV-254 and DBP formation potential for all waters studied....
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We reconstructed late Holocene fluctuations of Kluane Lake in Yukon Territory from variations in bulk physical properties and carbon and nitrogen elemental and isotopic abundances in nine sediment cores. Fluctuations of Kluane Lake in the past were controlled by changes in climate and glaciers, which affected inflow of Slims and Duke rivers, the two largest sources of water flowing into the lake. Kluane Lake fluctuated within a narrow range, at levels about 25 m below the present datum, from about 5000 to 1300 cal yr BP. Low lake levels during this interval are probably due to southerly drainage of Kluane Lake to the Pacific Ocean, opposite the present northerly drainage to Bering Sea. Slims River, which today is...
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The Tlikakila River is located in Lake Clark National Park and Preserve and drains an area of 1,610 square kilometers (622 square miles). Runoff from the Tlikakila River Basin accounts for about one half of the total inflow to Lake Clark. Glaciers occupy about one third of the basin and affect the runoff characteristics of the Tlikakila River. As part of a cooperative study with the National Park Service, glacier changes and runoff characteristics in the Tlikakila River Basin were studied in water years 2001 and 2002.
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During the 2012 field season, the Central Alaska Network (CAKN) Stream Monitoring Program made 130 site visits to 58 unique stream sites across the network (Figure 1), with each site being sampled one to five times from early May through late September. The data collected included instantaneous water chemistry, stream flow, water chemistry samples, macroinvertebrates, benthic diatoms, stable isotope samples, habitat data and environmental DNA samples. Continuous year-round temperature monitoring at 23 sites across the network is ongoing. At the request of DENA staff, the Stream Monitoring Program collected water chemistry, metals, invertebrates and diatoms from 7 sites in the Kantishna Hills. Active layer depth...
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This report contains water-quality and sediment-quality data from samples collected in the Yukon River Basin from March through September during the 2005 water year (WY). Samples were collected throughout the year at five stations in the basin (three on the main stem Yukon River, one each on the Tanana and Porcupine Rivers). A broad range of physical, chemical, and biological analyses are presented. This is the final report in a series of five USGS Open-File Reports spanning five WYs, from October 2000 through September 2005. The previous four reports are listed in the references (Schuster, 2003, 2005a, 2005b, 2006). Water-quality and sediment-quality data from samples collected on the Yukon River and selected...
map background search result map search result map Cottonwood Creek Ecological Assessment Multi-trophic resilience of boreal lake ecosystems to forest fires Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido Characteristics of sediment discharge in the subarctic Yukon River, Alaska A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Effects of Spatial Aggregation of Initial Conditions and Forcing Data on Modeling Snowmelt Using a Land Surface Scheme Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring Water and sediment quality in the Yukon River basin, Alaska, during water year 2005 Glacial History and Runoff Components of the Tlikakila River Basin, Lake Clark National Park and Reserve, Alaska High-energy sedimentary processes in Kluane Lake, Yukon Territory Restoration Evaluation—Fish Passage Final Report Lake Lucile Sediment Quality Sampling: Spatial Extent of Impaired Sediment due to Outfall Stormwater Inputs. Final Report for: Alaska Department of Environmental Conservation Impacts and prognosis of natural resource development on aquatic biodiversity in Canada's boreal zone Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years Use of Geochemical Forensics to Determine Release Eras of Petrochemicals to Groundwater, Whitehorse, Yukon Wrangell - St. Elias National Park and Preserve : Alaska : Water resources scoping report CAKN Stream Monitoring Program 2012 Field Season Report Lake Lucile Sediment Quality Sampling: Spatial Extent of Impaired Sediment due to Outfall Stormwater Inputs. Final Report for: Alaska Department of Environmental Conservation Effects of Spatial Aggregation of Initial Conditions and Forcing Data on Modeling Snowmelt Using a Land Surface Scheme Use of Geochemical Forensics to Determine Release Eras of Petrochemicals to Groundwater, Whitehorse, Yukon Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska High-energy sedimentary processes in Kluane Lake, Yukon Territory Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years Glacial History and Runoff Components of the Tlikakila River Basin, Lake Clark National Park and Reserve, Alaska Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring Multi-trophic resilience of boreal lake ecosystems to forest fires Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido Wrangell - St. Elias National Park and Preserve : Alaska : Water resources scoping report Restoration Evaluation—Fish Passage Final Report CAKN Stream Monitoring Program 2012 Field Season Report Characteristics of sediment discharge in the subarctic Yukon River, Alaska Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions Water and sediment quality in the Yukon River basin, Alaska, during water year 2005 A positive correlation between photoperiod and development rate in summer species of Odonata could help to make emergence date appropriate to latitude: a testable hypothesis Impacts and prognosis of natural resource development on aquatic biodiversity in Canada's boreal zone