The Experts below are selected from a list of 25692 Experts worldwide ranked by ideXlab platform
Mohammad Safeeq - One of the best experts on this subject based on the ideXlab platform.
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disentangling effects of Forest Harvest on long term hydrologic and sediment dynamics western cascades oregon
Journal of Hydrology, 2020Co-Authors: Mohammad Safeeq, Gordon E Grant, Sarah L Lewis, Shannon K HayesAbstract:Abstract The magnitude of sediment yield following Forest timber Harvest is controlled by increases in both sediment supply and streamflow. Since the relation between sediment transport and streamflow typically follows a power law, small increases in streamflow may translate into large increases in sediment transport. Interpreting the geomorphic effects of streamflow increases is confounded by the fact that timber Harvest influences both the hydrologic regime and sediment supply of a watershed simultaneously, making it difficult to isolate the streamflow effect alone. Here we report on a novel approach to this problem using long-term data from two paired catchments located in the H.J. Andrews Experimental Forest, Oregon, USA. We use observed streamflow from the treated (clearcut) and control watersheds to reconstruct a natural streamflow time series for the treated watershed, one that represents streamflow response in conditions prior to Harvest. We combine this reconstructed natural streamflow time series with observed relations between streamflow and sediment transport to quantify the background sediment yield and disentangle the relative effects of changes in hydrology and sediment supply. Results indicate that while increases in streamflow can account for modest increases in sediment transport, this is dwarfed by the increased supply of sediment that accompanies most timber Harvest. These results have broad relevance to Forest timber Harvest and fuel management practices worldwide and can be used to constrain or set bounds on likely effects of more modest (i.e., thinning) techniques.
Julia A Jones - One of the best experts on this subject based on the ideXlab platform.
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stream temperature responses to Forest Harvest and debris flows in western cascades oregon
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Sherri L Johnson, Julia A JonesAbstract:Stream temperature controls the rates of many biotic and abiotic processes and is influenced by changes in streamside land use practices. We compiled historic stream temperature data and reestablished study sites in three small basins in the H.J. Andrews Experimental Forest in the western Cascades, Oregon, to reexamine the effects on and re- covery of stream temperatures following removal of riparian vegetation. Maximum stream temperatures increased 7°C and occurred earlier in the summer after clear-cutting and burning in one basin and after debris flows and patch-cutting in another. Diurnal fluctuations in June increased from approximately 2 to 8°C. Stream temperatures in both basins gradually returned to preHarvest levels after 15 years. The influence of the primary factor controlling stream tempera - tures, shortwave solar radiation, was amplified following removal of riparian vegetation, and conduction between stream water and nearby soils or substrates also appeared to be an important factor. Shifts in the timing of summer maxima and greater increases in early summer stream temperatures could impact sensitive stages of aquatic biota. Resume : La temperature des cours d'eau regit le rythme de nombreux processus biotiques et abiotiques, et se trouve sous l'influence des changements dans les pratiques d'amenagement du territoire sur les rives. Nous avons compile les donnees historiques sur la temperature des cours d'eau et retabli des stations d'etude dans trois petits bassins de la fo - ret experimentale H.J. Andrews, dans l'ouest des Cascades (Oregon), pour reexaminer les effets de l'enlevement de la vegetation riveraine sur la temperature des cours d'eau, et le retablissement subsequent. Les temperatures maximales des cours d'eau ont augmente de 7°C, et les augmentations se sont produites plus tot dans l'ete, apres la coupe a blanc et le brulage dans un bassin, et apres des apports de debris et du jardinage par bouquets dans un autre. Les fluctua- tions diurnes en juin ont augmente d'environ 2 a 8°C. Dans les deux bassins, les temperatures des cours d'eau sont graduellement revenues aux niveaux pre-exploitation au bout de 15 ans. L'influence du principal facteur regissant la temperature des cours d'eau, le rayonnement solaire a ondes courtes, a ete amplifiee par suite de l'elimination de la ve- getation riveraine, et la conduction entre l'eau de la riviere et les sols ou les substrats adjacents semblait aussi un fac- teur important. Les changements dans l'occurrence des maximums d'ete, et les augmentations plus fortes des temperatures des cours d'eau au debut de l'ete, pourraient avoir un impact sur les stades vulnerables du biote aqua- tique. (Traduit par la Redaction) Johnson and Jones 39
Shannon K Hayes - One of the best experts on this subject based on the ideXlab platform.
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disentangling effects of Forest Harvest on long term hydrologic and sediment dynamics western cascades oregon
Journal of Hydrology, 2020Co-Authors: Mohammad Safeeq, Gordon E Grant, Sarah L Lewis, Shannon K HayesAbstract:Abstract The magnitude of sediment yield following Forest timber Harvest is controlled by increases in both sediment supply and streamflow. Since the relation between sediment transport and streamflow typically follows a power law, small increases in streamflow may translate into large increases in sediment transport. Interpreting the geomorphic effects of streamflow increases is confounded by the fact that timber Harvest influences both the hydrologic regime and sediment supply of a watershed simultaneously, making it difficult to isolate the streamflow effect alone. Here we report on a novel approach to this problem using long-term data from two paired catchments located in the H.J. Andrews Experimental Forest, Oregon, USA. We use observed streamflow from the treated (clearcut) and control watersheds to reconstruct a natural streamflow time series for the treated watershed, one that represents streamflow response in conditions prior to Harvest. We combine this reconstructed natural streamflow time series with observed relations between streamflow and sediment transport to quantify the background sediment yield and disentangle the relative effects of changes in hydrology and sediment supply. Results indicate that while increases in streamflow can account for modest increases in sediment transport, this is dwarfed by the increased supply of sediment that accompanies most timber Harvest. These results have broad relevance to Forest timber Harvest and fuel management practices worldwide and can be used to constrain or set bounds on likely effects of more modest (i.e., thinning) techniques.
Sarah L Lewis - One of the best experts on this subject based on the ideXlab platform.
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disentangling effects of Forest Harvest on long term hydrologic and sediment dynamics western cascades oregon
Journal of Hydrology, 2020Co-Authors: Mohammad Safeeq, Gordon E Grant, Sarah L Lewis, Shannon K HayesAbstract:Abstract The magnitude of sediment yield following Forest timber Harvest is controlled by increases in both sediment supply and streamflow. Since the relation between sediment transport and streamflow typically follows a power law, small increases in streamflow may translate into large increases in sediment transport. Interpreting the geomorphic effects of streamflow increases is confounded by the fact that timber Harvest influences both the hydrologic regime and sediment supply of a watershed simultaneously, making it difficult to isolate the streamflow effect alone. Here we report on a novel approach to this problem using long-term data from two paired catchments located in the H.J. Andrews Experimental Forest, Oregon, USA. We use observed streamflow from the treated (clearcut) and control watersheds to reconstruct a natural streamflow time series for the treated watershed, one that represents streamflow response in conditions prior to Harvest. We combine this reconstructed natural streamflow time series with observed relations between streamflow and sediment transport to quantify the background sediment yield and disentangle the relative effects of changes in hydrology and sediment supply. Results indicate that while increases in streamflow can account for modest increases in sediment transport, this is dwarfed by the increased supply of sediment that accompanies most timber Harvest. These results have broad relevance to Forest timber Harvest and fuel management practices worldwide and can be used to constrain or set bounds on likely effects of more modest (i.e., thinning) techniques.
Gordon E Grant - One of the best experts on this subject based on the ideXlab platform.
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disentangling effects of Forest Harvest on long term hydrologic and sediment dynamics western cascades oregon
Journal of Hydrology, 2020Co-Authors: Mohammad Safeeq, Gordon E Grant, Sarah L Lewis, Shannon K HayesAbstract:Abstract The magnitude of sediment yield following Forest timber Harvest is controlled by increases in both sediment supply and streamflow. Since the relation between sediment transport and streamflow typically follows a power law, small increases in streamflow may translate into large increases in sediment transport. Interpreting the geomorphic effects of streamflow increases is confounded by the fact that timber Harvest influences both the hydrologic regime and sediment supply of a watershed simultaneously, making it difficult to isolate the streamflow effect alone. Here we report on a novel approach to this problem using long-term data from two paired catchments located in the H.J. Andrews Experimental Forest, Oregon, USA. We use observed streamflow from the treated (clearcut) and control watersheds to reconstruct a natural streamflow time series for the treated watershed, one that represents streamflow response in conditions prior to Harvest. We combine this reconstructed natural streamflow time series with observed relations between streamflow and sediment transport to quantify the background sediment yield and disentangle the relative effects of changes in hydrology and sediment supply. Results indicate that while increases in streamflow can account for modest increases in sediment transport, this is dwarfed by the increased supply of sediment that accompanies most timber Harvest. These results have broad relevance to Forest timber Harvest and fuel management practices worldwide and can be used to constrain or set bounds on likely effects of more modest (i.e., thinning) techniques.