Download or read book The Importance of Data Quality in a Stream Temperature Model written by James E. Palumbo and published by . This book was released on 2005 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Data Granularity and Stream Classification on Temperature Gradient Modeling in Michigan s Streams written by Halil Ibrahim Dertli and published by . This book was released on 2021 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stream temperature is an important parameter of water quality and developing models capable of reliable predictions are critically important in stream management. In addition to the structure of these models (e.g., predictive variables), there are other factors that may influence model performance such as the selection of data granularity (i.e., level of temporal aggregation) and seasonal coverage of data collection. Data granularity and seasonal extent of data collection vary widely in the literature and have often been arbitrarily selected in stream temperature modeling studies in the past, but the consequences of these choices have not been explored. I applied different data granularity and time period selections to regression models, which were developed by Andrews (2019) to predict temperature gradient (i.e., stream temperature change) in Michigan's streams. Applying higher data granularity increased overall model performances and changed model selection results, however applying different time periods did not have a substantial effect on model performances. Using higher data granularity also changed model parameter estimates by increasing the multicollinearity in best-fitting models. In addition to temporal data granularity, data may be pooled spatially across streams within a thermal class to reduce the costs of data collection. I examined the impact of stream classification on model performance by applying data pooling within stream classes. Stream-Specific Models had better performance compared to Class-Based Models. Additional analyses suggested that classifying streams based on temperature gradient instead of stream temperature may result in better Class-Based Model performance.
Download or read book Stream Temperature Investigations written by John M. Bartholow and published by . This book was released on 1989 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards a High Resolution Global Stream Temperature Model written by Joseph Ariwi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Water temperature is a key component in freshwater aquatic environments, acting as a driver of habitat processes and a trigger of life cycle events for riverine invertebrate and vertebrate species. Habitat suitability for fish species can be defined by maximum and minimum temperature tolerances and both habitat-forming processes and migratory behaviors are a function of localized thermal regimes. The salience of thermal regimes on river ecology is of particular importance given the increased alteration of riverscapes through the construction of impoundments, as well as the abstraction and deposition of large volumes of water in industrial and agricultural practices that alter thermal regimes. Thermal regimes have also been shown to be impacted by global climate change. River temperature data is available at a high resolution through the use of remote sensing along individual river reaches or from onsite measurements at river gauging stations. There is, however, a lack of high resolution river temperature data at the global scale of a consistent quality that captures the full spatiotemporal temperature variation in every river reach. Using two main estimation approaches - a local technique and a physically based river network mixing technique - four temperature estimation models are developed. The four models were developed using global data for global application, but were only applied within the contiguous United States of America. The results present the spatiotemporal patterns of simulated long-term mean monthly river temperatures. The estimates are evaluated using observed data across the contiguous United States of America and the effectiveness of the estimation methods are compared and contrasted. Within the scope of this study, a logistic function with optimized model parameters was found to be the best performing stream temperature estimation model, producing strong validation statistics across different terrestrial biomes. However, the performance of this technique was found to be poor in rivers impacted by anthropogenic flow regulation, glacier or snow melt, and other perturbations. The data produced will be of value in ecological assessments and provides a baseline for global stream temperature data at a high spatial resolution." --
Download or read book Stream temperature Characteristics in Georgia written by T. R. Dyar and published by . This book was released on 1997 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water resources Investigations Report written by and published by . This book was released on 1998 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Temperature Modeling in Streams to Support Ecological Restoration written by Nathaniel L Butler and published by . This book was released on 2015 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water temperature is a critical water quality parameter that affects salmonid survival by influencing its metabolism and growth at all life stages. Stream temperature is an especially important parameter in California rivers where it frequently limits the range of salmonids. Anthropogenic activities have increased stream temperature and degraded spawning, holding, and rearing habitats, and this has contributed to declines in salmonid populations in California. Fisheries managers have a range of analytical and empirical tools available to assess and quantify elevated stream temperature conditions, but many of these tools do not focus on water temperature conditions at the spatial and temporal scales important to salmonids. My research focuses on assessing water temperature at the watershed and upwelling hyporheic scale which are critical to salmonid survival as stream temperature approaches thermal tolerances. I developed a model to calculate water temperature at locations throughout a watershed to provide a method to evaluate the availability and connectivity of suitable thermal habitat throughout a stream network. The model used a linear weighted average of the maximum and minimum air temperatures of the current and 4 prior days. The weighting parameter is dependent upon upstream drainage area enabling the application of the model to both small tributaries and large mainstem streams. I used historical data from the Sonoma Creek, Napa River, and Russian River watersheds to develop, test, calibrate, and partially validate the model. Model results from Sonoma Creek and Napa River indicated it was generally able to estimate daily average water temperature within 1.5 degrees C of the observed water temperature. Data from the Russian River highlighted the model was limited to streams without significant hydrologic modifications or geologic constraints that forced groundwater to the surface. A 1-D advection dispersion heat transport model was developed to quantify the upwelling hyporheic temperature that provides cold water thermal refugia along a streambed for salmonids. I analyzed hyporheic temperature measured at five sites in a previous research program across sixteen kilometers of Deer Creek near Vina, California, to test, calibrate, and partially validate the model. At three sites, I found the 1-D advection and dispersion were the dominant heat transport mechanisms with model root mean square error less than 0.6 degrees C. At two sites, the model was not applicable because modeling results indicated that surface flow rate variations, solar radiation, and multi-day flow paths also influenced the upwelling hyporheic temperature. Modeling was valuable for highlighting the contribution of these additional processes from that of 1-D advection dispersion. The availability of monitoring data over the summer-fall period was essential for modeling upwelling temperature dynamics along a semi-natural channel.
Download or read book Hydrodynamics and Transport for Water Quality Modeling written by James L. Martin and published by CRC Press. This book was released on 2018-05-04 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamics and Transport for Water Quality Modeling presents a complete overview of current methods used to describe or predict transport in aquatic systems, with special emphasis on water quality modeling. The book features detailed descriptions of each method, supported by sample applications and case studies drawn from the authors' years of experience in the field. Each chapter examines a variety of modeling approaches, from simple to complex. This unique text/reference offers a wealth of information previously unavailable from a single source. The book begins with an overview of basic principles, and an introduction to the measurement and analysis of flow. The following section focuses on rivers and streams, including model complexity and data requirements, methods for estimating mixing, hydrologic routing methods, and unsteady flow modeling. The third section considers lakes and reservoirs, and discusses stratification and temperature modeling, mixing methods, reservoir routing and water balances, and dynamic modeling using one-, two-, and three-dimensional models. The book concludes with a section on estuaries, containing topics such as origins and classification, tides, mixing methods, tidally averaged estuary models, and dynamic modeling. Over 250 figures support the text. This is a valuable guide for students and practicing modelers who do not have extensive backgrounds in fluid dynamics.
Download or read book Measuring Stream Temperature with Digital Data Loggers written by Jason Dunham and published by . This book was released on 2005 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instream Water Temperature Model written by Fred D. Theurer and published by . This book was released on 1985 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Stream Temperature with Digital Data Loggers written by and published by . This book was released on 2005 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Stream Temperature in Support of Fish Production Modeling Under Future Climates in the Klamath River Basin written by Lorraine E Flint and published by CreateSpace. This book was released on 2014-07-10 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stream temperature estimates under future climatic - ing for evaluation of effects of dam removal in the Klamath River Basin. To allow for the persistence of the Klamath River 2012 will review potential changes in water quality and stream temperature to assess alternative scenarios, including damusing a regression model approach with simulated net solar temperature, and mean daily air temperature. Models were calibrated for 6 streams in the Lower, and 18 streams in the Upper, Klamath Basin by using measured stream temperatures for 1999–2008. The standard error of the y-estimate for the estimation of stream temperature for the 24 streams ranged from 0.36 to 1.64 degrees Celsius (°C), with an average error of 1.12°C for all streams. The regression models were then used with projected air temperatures to estimate future stream temperatures for 2010–99. Although the mean change from the baseline historical period of 1950–99 to the projected future period of 2070–99 is only 1.2°C, it ranges from 3.4°C for the Shasta River to no change for Fall Creek and Trout Creek. Variability is also evident in the future with a mean change in temperature for all streams from the baseline period to the projected period of 2070–99 of only 1°C, while the range in stream temperature change is from 0 to 2.1°C. The baseline period, 1950–99, to which the air temperature projections were corrected, established the starting point for the projected changes in air temperature. The average measured daily air temperature for the calibration period 1999–2008, however, was found to be as much as 2.3°C higher than baseline for some rivers, indicating that warming conditions have already occurred in many areas of the Klamath River Basin, and that the stream temperature projections for the 21st century could be underestimating the actual change.
Download or read book Hydrology in a Changing World written by Shailesh Kumar Singh and published by Springer. This book was released on 2019-02-18 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive overview of the challenges in hydrological modeling. Hydrology, on both a local and global scale, has undergone dramatic changes, largely due to variations in climate, population growth and the associated land-use and land-cover changes. Written by experts in the field, the book provides decision-makers with a better understanding of the science, impacts, and consequences of these climate and land-use changes on hydrology. Further, offering insights into how the changing behavior of hydrological processes, related uncertainties and their evolution affect the modeling process, it is of interest for all researchers and practitioners using hydrological modeling.
Download or read book Improving the Statistical Reliability of Stream Heat Assimilation Prediction written by Richard W. McLay and published by . This book was released on 1975 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stream Temperature Monitoring and Modeling to Inform Restoration written by Jessica R. Wood and published by . This book was released on 2017 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water temperature is an important variable for aquatic ecosystems. Salmonid population numbers and distribution are heavily influenced by stream temperature, and there is growing concern about the health of salmonid populations with anticipated climate change. Managers are looking to efficiently evaluate options to maintain stream temperatures needed by salmonids. This study evaluated and compared stream temperature restoration alternatives in two streams with warm temperatures using stream temperature monitoring and modeling. The first study identified pockets of cold water that are important to native fish species in Nevada’s Walker River. Comparison of monitoring results with existing basin-scale model outputs identified two habitat features, beaver dams and irrigation return flow channels, that maximize stream temperature variability. Restoration should maintain and enhance these features, although different restoration approaches may be needed at different locations. This study may provide guidance for the interpretation of stream temperature results from other basin-scale models. The second study quantified stream temperature effects of wildfire and restoration plantings in Oregon’s Meadow Creek with current and projected mid-21st century climate. A stream temperature model developed and applied using Heat Source found restoration eliminated days above the lethal threshold (25 oC) for salmonids and decreased the number of days exceeding spawning criteria during spawning periods. Days exceeding salmonid spawning (13 oC) and rearing (18 oC) thresholds were reduced by all vegetation restoration scenarios, but eliminated by none. Results highlights the importance of the length and location of restoration, which can maximize pockets of cold water for salmonids or alleviate the impact of warm water sections.
Download or read book Evaluation of Prediction Models and Characterization of Stream Temperature Regimes in Washington Final report written by and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Water supply Paper written by and published by . This book was released on 1982 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:
