A5006489776- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Hydraulic flow and structures
- Fish Ecology and Management Studies
- Geological formations and processes
- Flood Risk Assessment and Management
- Water Quality and Resources Studies
- Water resources management and optimization
- Plant Water Relations and Carbon Dynamics
- Dam Engineering and Safety
- Geology and Paleoclimatology Research
- Ecology and biodiversity studies
- Remote Sensing and LiDAR Applications
- Coastal wetland ecosystem dynamics
- Water Resources and Management
- Agriculture Sustainability and Environmental Impact
- Environmental and Sediment Control
- Tree-ring climate responses
- Forest Management and Policy
- Forest Biomass Utilization and Management
- Climate Change Policy and Economics
- Atmospheric chemistry and aerosols
- Aquatic and Environmental Studies
- Capital Investment and Risk Analysis
United States Bureau of Reclamation
2013-2023
ORCID
2022
Forest Research
1999-2012
Denver Federal Center
2006-2008
Colorado State University
2006
Abstract Dam removal is widely used as an approach for river restoration in the United States. The increase dam removals—particularly large dams—and associated dam‐removal studies over last few decades motivated a working group at USGS John Wesley Powell Center Analysis and Synthesis to review synthesize available of removals their findings. Based on thus far, some general conclusions have emerged: (1) physical responses are typically fast, with rate sediment erosion largely dependent...
Abstract Sediment pulses can cause widespread, complex changes to rivers and coastal regions. Quantifying landscape response sediment-supply is a long-standing problem in geomorphology, but the unanticipated nature of most sediment rarely allows for detailed measurement associated processes evolution. The intentional removal two large dams on Elwha River (Washington, USA) exposed ~30 Mt impounded fluvial erosion, presenting unique opportunity quantify source-to-sink river responses massive...
The Colorado River ecosystem in lower Glen Canyon and throughout Marble Grand Canyons was greatly altered following closure of Dam 1963, as flood control daily fluctuating releases from the dam caused large ecological changes. Ecosystem research conducted 1983 through 1990, intensively 1990 1995 when were modified both for scientific purposes protection river ecosystem. High flows (e.g., beach/habitat building flows) included Environmental Impact Statement (EIS), which identified a preferred...
Abstract Woody biomass produced from short rotation coppice ( SRC ) poplar Populus spp.) and willow Salix is a bioenergy feedstock that can be grown widely across temperate landscapes its use likely to increase in future. Process‐based models are therefore required predict current future yield potential spatially resolved consider new genotypes climates will influence yield. The development of process‐based model for willow, ForestGrowth‐ , described the ability water efficiency WUE was...
In 2008 and 2009, a series of bed load impact plates was installed across channel spanning weir on the Elwha River, Washington. This is first permanent installation its kind in North America one largest anywhere. The purpose this system to measure coarse during after removal Glines Canyon Dams. It estimated that 21 million m3 sediment have accumulated behind both dams, with 45–50% total volume expected be eroded through natural processes. plate consists 72 at diversion downstream from dams 5...
Given the burgeoning dam removal movement and large number of dams approaching obsolescence in United States, cost estimating data tools are needed for prioritization, planning, execution. We used list removed compiled by American Rivers to search publicly available reported costs projects. Total information could include component related project deconstruction, monitoring, several categories mitigation activities. from 455 unique sources 668 States 1965 2020. The removals occurred within...
Abstract Identifying the relative contributions of physical and ecological processes to channel evolution remains a substantial challenge in fluvial geomorphology. We use 74‐year aerial photographic record Hoh, Queets, Quinault, Elwha Rivers, Olympic National Park, Washington, USA, investigate whether or trophic‐cascade‐driven factors – excessive elk impacts after wolves were extirpated century ago are dominant drivers planform these gravel‐bed rivers. find that width braiding show strong...
Removal of two dams from the Elwha River is a unique restoration opportunity. In place for over 95 years, have contributed to changes in river, its estuary, and marine areas off shore river mouth, largely through reductions sediment supply salmon populations. Impending removals both will only restore part severely degraded nearshore, where additional large scale anthropogenic impacts remain. The effects lower levees, bluff hardening including significant riprapping shoreline, among other...
We present a mechanistic model of wood tissue development in response to changes competition, management and climate. The is based on refinement the pipe theory, where constant ratio between sapwood leaf area (pipe theory) replaced by conductivity area. Simulated with age, stand density climate allocation or radius, both. central equation model, which calculates carbon (C) allocated leaves pipes, can be parameterized describe contrasting stem behavior different tree species: from (functional...
Abstract Riverine infrastructure provides essential services for the operation and development of world's nations their economies. When much this was built in United States, fluvial processes stream ecology were not well understood, putting it conflict with at risk from environment. High maintenance costs are often required to keep such viable some has led degradation aquatic riparian ecosystems. This commentary paper lays foundation designers managers build manage a manner both resilient...
Water storage reservoirs can be either sustainable or exhaustible. In the absence of sediment management, reservoir is an exhaustible resource with long-term consequences. Previous economic planning essentially guaranteed non-sustainable solutions. This paper describes a new paradigm for assessments and existing reservoirs. The provides framework comprehensive accounting benefits costs over sufficiently long period analysis, including cost estimates dam decommissioning lost where sediments...
During and after the planned incremental removal of two large, century-old concrete dams between 2011 2014, sediment-transport regime in lower Elwha River western Washington will initially spike above background levels then return to pre-dam conditions some years complete dam removal. Measurements indicate upper reaches steep-gradient River, draining northeast section Olympic Mountains, carries an estimated 120,000 290,000 cubic meters sediment annually. This large load has deposited 19...
The inexorable loss of capacity the nation's reservoirs—sooner or later threatening water supplies for municipal, agricultural, and industrial uses—is but one a number deleterious effects wrought by sediment deposition. Trapped sediments can also damage bury dam outlets, intakes, related infrastructure. Downstream capture retention reservoirs include channel habitat degradation biotic alterations.