Sediment Yield in Salmon Creek After Decommissioning Logging Roads, Northern Humboldt County, California PDF Download
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Author: Malia S.B. Gonzales Publisher: ISBN: Category : Erosion Languages : en Pages : 167
Book Description
Salmon Creek watershed is located in the Headwaters Forest Reserve in northern California and is known for the ecological value of its old-growth redwood forest, high biodiversity, and sensitive habitat for endangered species. The Bureau of Land Management primarily manages the Reserve. The land-use history of the Upper Salmon Creek watershed includes extensive timber harvest and road development. Watershed restoration in the Upper Salmon Creek watershed started in 2000 with the primary goal for the Reserve to protect and recover ecologic diversity and threatened native species. Since then, of the 23 miles, 13.5 miles of logging roads and 101 stream crossings have been decommissioned and treated, with 2 miles maintained, 2.4 miles passively restored, and 5.1 miles still requiring assessment. The restoration work is focused on long term reduction in sediment delivery from erosional sites that have historically degraded water quality in the Salmon Creek watershed. A stream monitoring station is located in the Upper Salmon Creek watershed that uses a turbidity threshold sampling protocol based on turbidity, stage, and temperature. The objective is to evaluate the data collected from Water Year (WY) 2012 to 2019 to assess the sediment yield in the watershed. The field and laboratory data collected at the stream monitoring station were used to further understand the relationships between hydrology, sediment transport, and land-use, and to estimate sediment load from WY 2012 to 2019. Additionally, two precipitation-monitoring stations were installed in the Upper Salmon Creek watershed during WY 2019, to provide a more spatially representative rainfall data set.
Author: Malia S.B. Gonzales Publisher: ISBN: Category : Erosion Languages : en Pages : 167
Book Description
Salmon Creek watershed is located in the Headwaters Forest Reserve in northern California and is known for the ecological value of its old-growth redwood forest, high biodiversity, and sensitive habitat for endangered species. The Bureau of Land Management primarily manages the Reserve. The land-use history of the Upper Salmon Creek watershed includes extensive timber harvest and road development. Watershed restoration in the Upper Salmon Creek watershed started in 2000 with the primary goal for the Reserve to protect and recover ecologic diversity and threatened native species. Since then, of the 23 miles, 13.5 miles of logging roads and 101 stream crossings have been decommissioned and treated, with 2 miles maintained, 2.4 miles passively restored, and 5.1 miles still requiring assessment. The restoration work is focused on long term reduction in sediment delivery from erosional sites that have historically degraded water quality in the Salmon Creek watershed. A stream monitoring station is located in the Upper Salmon Creek watershed that uses a turbidity threshold sampling protocol based on turbidity, stage, and temperature. The objective is to evaluate the data collected from Water Year (WY) 2012 to 2019 to assess the sediment yield in the watershed. The field and laboratory data collected at the stream monitoring station were used to further understand the relationships between hydrology, sediment transport, and land-use, and to estimate sediment load from WY 2012 to 2019. Additionally, two precipitation-monitoring stations were installed in the Upper Salmon Creek watershed during WY 2019, to provide a more spatially representative rainfall data set.
Author: Raymond Martin Rice Publisher: ISBN: Category : Erosion Languages : en Pages : 20
Book Description
The effect of logging and roadbuilding on erosion and sedimentation are analyzed by comparing the North Fork and South Fork of Caspar Creek, in northern California. Increased sediment production during the 4 years after road construction, was 326 cu yd/sq mi/yr-80 percent greater than that predicted by the predisturbance regression analysis. The average sediment load during the 3 years of logging increased by 957 cu yd/sq mi/yr-275 percent greater than the predicted values. Although the erosion or sediment increases do not appear to be degrading site quality, average turbidity levels in the South Fork exceeded water quality standards.
Author: Mary A. Raines Publisher: ISBN: Category : Erosion Languages : en Pages : 0
Book Description
A sediment budget constructed for the Grouse Creek basin in northern California provides information on the sources and timing of sediment production to aid land managers in understanding the effects of logging impacts in a sensitive watershed. The sediment budget yields a sediment production rate of 1,750 t/km2/yr for a 29-year period. This rate is among the highest for such disturbed forested basins in the Pacific Northwest. Approximately 40 percent of the Grouse Creek basin, which is bisected by regional structural features that have created zones of weak and altered rock, has been logged in the last 35 years. Sediment production is dominated by mass wasting and is concentrated in areas of geologic instability and logging and during major storms. Over 86 percent of all sediment was produced by landsliding, with 71 percent of landslide volumes generated during a six-year period that includes the flood of December 1964. Ninety-three percent of all sediment volumes were generated during the 15-year period from 1960 to 1975 that included four major storm events, the completion of 74 percent of basin logging activity and 80 percent of road building. Landsliding in old growth was found to be spatially related to erosion in managed areas. Sediment produced in logged and roaded areas increased the frequency of streamside landsliding in some downstream, unmanaged areas by channel aggradation and lateral corrosion of the streambanks. The remainder of sediment produced from erosion of streambanks, bare hillslopes, and roads is less than 14 percent of the total sediment production. However, as landsliding decreased after 1975, the relative importance of hillslope erosion and road-related erosion increased. Erosion rates from roads are 20 to 140 times the erosion rates in the unmanaged areas and 7 to 34 times those in logged areas. Erosion processes in Grouse Creek were found to differ by stream order. Debris torrents and streambank erosion dominate in second and third-order channels, whereas streamside landsliding was more frequent in fourth through sixth-order streams. An estimate of the increase in stored sediment indicates 27 percent of the sediment introduced to stream channels during the 29-year period of the study is still in the system.
Author: Raymond Martin Rice Publisher: ISBN: Category : Erosion Languages : en Pages : 0
Book Description
The effect of logging and roadbuilding on erosion and sedimentation are analyzed by comparing the North Fork and South Fork of Caspar Creek, in northern California. Increased sediment production during the 4 years after road construction, was 326 cu yd/sq mi/yr-80 percent greater than that predicted by the predisturbance regression analysis. The average sediment load during the 3 years of logging increased by 957 cu yd/sq mi/yr-275 percent greater than the predicted values. Although the erosion or sediment increases do not appear to be degrading site quality, average turbidity levels in the South Fork exceeded water quality standards.
Author: Kevin J. Noone Publisher: Newnes ISBN: 0124076610 Category : Science Languages : en Pages : 372
Book Description
Managing Ocean Environments in a Changing Climate summarizes the current state of several threats to the global oceans. What distinguishes this book most from previous works is that this book begins with a holistic, global-scale focus for the first several chapters and then provides an example of how this approach can be applied on a regional scale, for the Pacific region. Previous works usually have compiled local studies, which are essentially impossible to properly integrate to the global scale. The editors have engaged leading scientists in a number of areas, such as fisheries and marine ecosystems, ocean chemistry, marine biogeochemical cycling, oceans and climate change, and economics, to examine the threats to the oceans both individually and collectively, provide gross estimates of the economic and societal impacts of these threats, and deliver high-level recommendations. Nominated for a Katerva Award in 2012 in the Economy category State of the science reviews by known marine experts provide a concise, readable presentation written at a level for managers and students Links environmental and economic aspects of ocean threats and provides an economic analysis of action versus inaction Provides recommendations for stakeholders to help stimulate the development of policies that would help move toward sustainable use of marine resources and services
Author: Malia S.B. Gonzales
Author: Malia S.B. Gonzales
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