Download or read book Transport of Bedload Sediment and Channel Morphology of a Southeast Alaska Stream written by Margaret A. Estep and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport of Bedload Sediment and Channel Morphology of a Southeast Alaska Stream written by Margaret A. Estep and published by . This book was released on 1985 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bedload Sediment Transport and Channel Morphology of a Southeast Alaskan Stream written by Margaret A. Estep and published by . This book was released on 1982 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted at portions of Trap Bay Creek, a medium-sized third-order stream on Chichagof Island, Southeast Alaska, to 1) quantify short-term sediment transport and channel morphology changes, 2) relate measured sediment transport rates to the major hydrologic parameters that appeared to determine the mechanisms of sediment transport, and 3) evaluate how bedload transport can influence channel morphology. Morphologic characteristics were evaluated by means of plani-metric surveys and cross-sectional measurements made in July and August of 1980 and August of 1981. Bedload and suspended sediment data were collected during the Fall of 1980 along with data on streamflow and precipitation. Morphologic evaulations indicated that the stream is a dynamic system and that it appeared to be widening and aggrading during 1980-81. Large organic debris, especially fallen trees, are important in stream morphology, especially above the zone of tidal influence. The tides, as well as human activity, probably contributed to recent morphological changes in lower reaches of the channel. Problems involved in processing suspended sediment samples resulted in a limited amount of suspended sediment data. However, data that were collected from one point on the stream indicated that suspended sediment concentrations were low, usually less than 5 mg·1−1, and did not exceed 90 mg·1−1 during an approximate 2 to 5-year return interval storm event. Under average storm conditions, therefore, suspended sediment transport appears to be supply limited and constitutes a small portion of total sediment transport. Bedload sediment samples were collected from a short pool-riffle study reach during a total of ten storms with streaflow ranging from 0.01 to 1.26 m3·s−1·km−2. Bedload sediment transport ranged from 3.9 to 4400 kg·hr−1, with peak transport rates occurring during peak streamflow. Regression relationships were developed between bedload transport, gravel-sized inorganic bedload transport, coarse particulate organic matter transport, two particle size diameter classes (D50 and D90), and stream discharge during the ten storms. This analysis revealed that total inorganic- bedload transport was more strongly related to discharge than was transport of the large size category, coarse particulate organic matter transport tended to be more strongly related to streamflow than bedload discharge, and that neither of the particle size diameters had any consistent relationship to streaflow. Bedload transport during the ten storms was further evaluated in terms of the sampling sites that were used, i.e. riffles above and below a depositional area approximately 20 m in length. Transport tended to be greater, in terms of amount transported, at the upper riffle for most of the storm events. The opposite was true during the largest storm of the season and a storm which occurred a week later. It may be that bedload sediment is transported past the upper riffle by lesser magnitude events and is temporarily stored in the pool. Transport out of the pool requires events of greater magnitude. Supply limitations also appear to determine bedload transport in Trap Bay Creek.
Download or read book Sediment Transport in the Tanana River in the Vicinity of Fairbanks Alaska 1977 written by William W. Emmett and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ice Bedload Transport and Channel Morphology on the Upper Kuparuk River written by Jeffrey Albert Oatley and published by . This book was released on 2002 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this study was to quantify the impact of bottom ice on sedimentation processes at a study site on the Upper Kuparuk River, in Northern Alaska. The approach taken was to use the Meyer-Peter and Mueller (1948) and Parker (1990) equations to determine bedload rating curves at four cross sections within the study reach, and to apply these rating curves to the ten year flow history of the study site to determine the total potential bedload transport that was suppressed during snowmelt runoff. In conjunction with this analysis, a tracer rock study was performed at the study site. During the first two years of the project, the field study yielded little bedload transport information, as there were no competent flows during this time. However, the storm of record occurred in August 02 2002, which provided an opportunity to observe the geomorphic response to a major event, to estimate an average bedload transport rate based on the virtual velocity of the recovered tracer rocks, and to compare the predictive methods to the tracer data based calculations. The results suggest that the potential bedload transport (500 m3) over the ten-year flow history is comparable to the amount of transport that occorred during the extreme event of August 2002 (870 m3), and that the suppression of bedload transport, due to an ice covered bed surfaces, likely affects the morphology and sediment supply of the river"--Leaf iii.
Download or read book Sediment Transport in the Tanana River Near Fairbanks Alaska 1982 written by Philip E. Harrold and published by . This book was released on 1983 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Note PNW written by and published by . This book was released on 1985 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Technical Report WO written by and published by . This book was released on 1975 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the Pacific Northwest Forest and Range Experiment Station written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1985 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment Transport in the Tanana River Near Fairbanks Alaska 1977 79 written by Robert L. Burrows and published by . This book was released on 1981 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the Pacific Northwest Research Station written by Pacific Northwest Research Station (Portland, Or.) and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Technical Report RM written by and published by . This book was released on 1989 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphology Hydraulics and Sediment Transport of an Ice covered River written by Cold Regions Research and Engineering Laboratory (U.S.) and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This initial study of the ice-covered Tanana River, near Fairbanks, Alaska, attempted to 1) establish field methods for systematic and repetitive quantitative analyses of an ice-covered river's regime, 2) evaluate the instruments and equipment for sampling, and 3) obtain the initial data of a long-term study of ice cover effects on the morphology, hydraulics and sediment transport of a braided river. A methodology was established, and detailed measurements and samplings, including profiling by geophysical techniques, were conducted along cross sections of the river. A small, portable rotary drill rig equipped with a 356-mm (14-in.) ice auger was used to cut large diameter holes in the ice cover for through-the-ice measurements. Portable heat sources and a heated shelter were required to continuously thaw and dry equipment for the repetitive measurements. Measurements included ice cover thickness, water level, water depth, temperature, flow velocity, suspended load and bed load, frazil ice distribution and bed material composition. Remotely gathered data included apparent resistivity and subsurface radar profiling. The various techniques, sampling gear and problems encountered during use in the subfreezing cold are described in detail in this report.
Download or read book Sediment Transport Characteristics of Selected Streams in the Susitna River Basin Alaska written by J. M. Knott and published by . This book was released on 1987 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a summary and discussion of sediment and hydraulic data collected at selected sites in the Susitna River basin between proposed damsites and Cook Inlet. The data were collected in a cooperative program between the Alaska Power Authority and U.S. Geological Survey for the planning of large-scale hydroelectric development on the upper Susitna River.
Download or read book Large Woody Debris and Channel Morphology of Undisturbed Streams in Southeast Alaska written by E. George Robison and published by . This book was released on 1987 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characteristics and interactions of the riparian stand, large woody debris (LWD), and channel morphology were examined on five undisturbed, low gradient streams in southeast Alaska. One first-, two second-, one third-, and one fourth-order streams were studied. Stream morphology variables were measured systematically at fixed intervals of three to ten feet depending on stream size: 50-foot intervals were used for riparian forest measurements. The percentage of alder comprising the riparian forest increased with stream size. The first- and second-order streams had alder comprising approximately 8% of the total basal area whereas, the fourth-order stream had 25 Likewise, the percentage of LWD pieces consisting of alder increased from 129 in the two smallest first and second-order streams to 319 in the fourth-order stream. These findings, along with inspection of air photos indicate a alternating 1'one sided" alder corridor exists along the largest stream. The proportion of large woody debris pieces with rootwads in the channel increased from 2 and 6% in the two smallest first- and second-order streams to 32° in the fourth-order stream indicating the largest stream has recruited LWD from bank cutting and/or lateral channel migration. LWD oriented perpendicular (900) to general stream flow was relatively frequent for all streams. No significant (alpha=0.05) linear relationship was found (r2
Download or read book Alaska Pulp Corporation Long term Timber Sale Contract Analysis area 12 Kuiu Island written by and published by . This book was released on 1989 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
