Functional Flows in Modified Riverscapes: Hydrographs, Habitats and Opportunities

Building on previous environmental flow discussions and a growing recognition that geomorphic and ecological processes are inherent to river functionality and biodiversity, we propose a functional flows approach to managing rivers in contemporary modified riverscapes. The approach focuses on...

Preliminary Optimization for Spring-Run Chinook Salmon Environmental Flows in Lassen Foothill Watersheds

Stream flow controls physical and ecological processes in rivers that support freshwater ecosystems and biodiversity vital for services that humans depend on. This master variable has been impaired by human activities like dam operations, water diversions, and flood control infrastructure....

A programmable information system for management and analysis of aquatic species range data in California

The decline of species worldwide is both alarming and difficult to document due to a lack of reliable information on the geospatial extent and corresponding status of a given taxon. Freshwater habitats are disproportionately degraded globally with resultant declines in populations in freshwater...

Simulating High-Elevation Hydropower with Regional Climate Warming in the West Slope, Sierra Nevada

Water systems in snowmelt-dominated hydroregions such as California’s Sierra Nevada mountains are sensitive to regional climate change, hydropower systems in particular. In this study, a water resources management model was developed for the upper west slope Sierra Nevada to understand the...

In bad waters: Water year classification in nonstationary climates

Water year indices and drought indices are helpful for categorizing water years into similar types, allowing water managers and policymakers to quantify years, visualize variability, and guide water operations. Many water management decisions, such as environmental flow requirements and water...

Characterization of the Unregulated Spring Snowmelt Recession in the Sierra Nevada, California, and Potential Changes with Regional Climate Warming

In previous work, we developed a conceptual model for the ecology and management of the spring snowmelt recession in Mediterranean-montane catchments. This conceptual model focused on three components of the Natural Flow Regime: magnitude, timing, and rate of change. Here we provide a model...

Conceptual ecosystem model of sub-Arctic river response to climate change: Kobuk River, Alaska

The Kobuk River runs west along the southern Brooks Range from Gates of the Arctic National Park in Alaska, USA, to the Chukchi Sea. It is highly vulnerable to changes in climate due to its sub-Arctic location, unique geography, and permafrost foundation. Combined with its pristine condition,...

Modeling the Hydrology of Climate Change in California’s Sierra Nevada for Sub-Watershed Scale Adaptation

The rainfall-runoff model presented in this study represents the hydrology of 15 major watersheds of the Sierra Nevada in California as the backbone of a planning tool for water resources analysis including climate change studies. Our model implementation documents potential changes in...

Identification of invasive vegetation using hyperspectral remote sensing in the California Delta ecosystem

Estuaries are among the most invaded ecosystems on the planet. Such invasions have led in part, to the formation of a massive $1 billion restoration effort in California's Sacramento–San Joaquin River Delta. However, invasions of weeds into riparian, floodplain, and aquatic habitats threaten the...

Objective classification of Navarro River salmon habitat: a watershed‐based critical habitat case study

  1. Prevailing freshwater conservation approaches in the USA stem from policy-based ecosystem management directives, science-based gap analyses, and legal interpretations of critical habitats. In California, there has been no systematic prioritization of freshwater habitats critical to the

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