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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Stream Temperature Monitoring And Modeling To Inform Restoration: A Study Of Thermal Variability In The Western Us, Jessica R. Wood
Stream Temperature Monitoring And Modeling To Inform Restoration: A Study Of Thermal Variability In The Western Us, Jessica R. Wood
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
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 …
Twentieth Century Channel Change Of The Green River In Canyonlands National Park, Utah, Alexander E. Walker
Twentieth Century Channel Change Of The Green River In Canyonlands National Park, Utah, Alexander E. Walker
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Since the early 20th century, river channels of the Colorado River basin have narrowed, decreasing available riparian and aquatic habitat. Changes are considered to be the result of three major factors: wide-spread water development, increasing hydroclimate variability and the invasion of non-native tamarisk (Tamarix spp.), altering flow regime and sediment supply. Different studies have reached different conclusions about the relative roles of flow regime, sediment supply and tamarisk in causing narrowing.
I investigated channel change in the lower Green River within Canyonlands National Park to describe channel changes in the 20th century and understand the roles …
Longitudinal Thermal And Solute Dynamics In Regulated Rivers, Muhammad Rezaul Haider
Longitudinal Thermal And Solute Dynamics In Regulated Rivers, Muhammad Rezaul Haider
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Dam releases increase river stage and can reverse groundwater movement into and out of the river. As the flood, thermal, and solute waves travel downstream in a regulated river, the size of the waves is anticipated to be affected both by river processes and exchanges with near river groundwater. This study established a modeling framework to quantify the influences of the groundwater exchanges on the temperatures and solute concentration dynamics along regulated rivers. The wave properties, volume of exchanges, conservative solute mass exchanges, and heat energy exchanges were calculated as a function of time and distance downstream. Results show that …
Optimizing Barrier Removal To Restore Connectivity In Utah’S Weber Basin, Maggi Kraft
Optimizing Barrier Removal To Restore Connectivity In Utah’S Weber Basin, Maggi Kraft
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
River barriers, such as dams, culverts and diversions are important for water conveyance, but disrupt river ecosystems and hydrologic processes. River barrier removal is increasingly used to restore and improve river habitat and connectivity. Most past barrier removal projects prioritized individual barriers using score-and-rank techniques, neglecting the spatial structure and cumulative change from multiple barrier removals. Similarly, most water demand models satisfy human water uses or, only prioritize aquatic habitat, failing to include both human and environmental water use benefits. In this study, a dual objective optimization model identified in-stream barriers that impede quality-weighted aquatic habitat connectivity for Bonneville cutthroat …
Changes In Floodplain Inundation Under Non-Stationary Hydrology For An Adjustable, Alluvial River Channel, Bruce C. Call
Changes In Floodplain Inundation Under Non-Stationary Hydrology For An Adjustable, Alluvial River Channel, Bruce C. Call
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Predicting the frequency and aerial extent of flooding in river valleys is essential for infrastructure design, environmental management, and risk assessment. Such flooding occurs when the discharge of water within a river channel exceeds its maximum capacity and the extra water submerges the adjoining floodplain surface. The maximum capacity of a channel is controlled by its geometry, gradient, and frictional resistance. Conventional flood prediction methods rely on assumptions of unchanging flood probabilities and channel capacities. However, changes in climate, land cover, and water management have been shown to systematically shift the magnitude and variability of flood flows in many systems. …