Daniel A Cenderelli

• Doctor of Philosophy
• Fluvial Geomorphologist at United States Department of Agriculture

This study takes an empirical approach to address the problem of predicting gravel transport rates in mountain streams. A total of 96 worldwide datasets on gravel transport relations versus water discharge were compiled including the writers' measurements and datasets from the literature. Unit rates of gravel transport occurring during a common hig...

Measurements from the commonly used Helley-Smith (HS) sampler can greatly misestimate gravel transport rates and the largest mobile bedload particles in mountain streams, especially when transport is low. Various factors contribute to mismeasurement. To shed light on the relative magnitude of the various factors' contributions, this study compares...

Riverine infrastructure provides essential services for the operation and development of the world's nations and their economies. When much of this infrastructure was built in the United States, fluvial processes and stream ecology were not well understood, putting it in conflict with and at risk from the stream environment. High maintenance costs...

The Many stream studies, from channel restoration to watershed management, require knowledge of the gravel transport rate for the normal annually expectable high flow event. Bedload transport equations fail at this task in mountain streams because they are not designed for coarse and rough bed or variable sediment supply. Similarly unfavorable is t...

Coarse particulate organic matter (CPOM) provides a food source for benthic organisms, and the fluvial transport of CPOM is one of the forms in which carbon is exported from a forested basin. However, little is known about transport dynamics of CPOM, its relation to discharge, and its annual exports from mountain streams. Much of this knowledge gap...

From a log-log scatterplot of worldwide data of qB,bf vs. A, a positive, slightly convex trend emerges when data are limited to central Rocky Mountain streams. The trend straightens when relating qB,bf to a modified unit stream power expression ω’ = ρ · qbf · S0.5 · %Dsub<8 that integrates the percentage of subsurface sediment < 8 mm (%Dsub<8). For...

This study compiled a worldwide set of 55 gravel transport relations measured in mountain streams using samplers considered most suited for coarse beds: bedload traps, vortex, baskets, and pit-type samplers. Power functions in the form of QB = a Q b were fitted to the sampled transport rates QB (g/s) and the discharge Q (m³/s) at the time of sampli...

Bedload samplers with coarse nets let small particles pass through the net, while samplers with fine nets have various problems capturing fine and coarse gravel bedload. Using samplers with nets of different mesh sizes may facilitate capture of a wider range of bedload particle sizes. However, preliminary evidence suggests that sampled transport ra...

Whereas effective discharge (Qeff) in mountain streams is commonly associated with a moderate flow such as bankfull discharge (Qbf), this study found that the maximum discharge (Qmax), and not bankfull discharge, is the channel forming or effective flow for gravel transport in plane-bed streams where partial bed mobility causes steep gravel transpo...

Stream simulation design is a geomorphic, engineering, and ecologically based approach to designing road–stream crossings that creates a natural and dynamic channel through the crossing structure similar in dimensions and characteristics to the adjacent natural channel, allowing for unimpeded passage of aquatic organisms, debris, and water during v...

[1] Critical Shields values ( ) suitable for specific applications are back-calculated from representative bed load samples in mountain streams and a flow competence/critical flow approach. The general increase of (for the bed D50 size) as well as and (for the bed D16 and D84 sizes) with stream gradient Sx and also the stratification of by relative...

Existing models and predictions project serious changes to worldwide hydrologic processes as a result of global climate change. Projections indicate that significant change may threaten National Forest System watersheds that are an important source of water used to support people, economies, and ecosystems. Wildland managers are expected to anticip...

Historically, road–stream crossing structures were designed on the basis of the hydraulic capacity of the structure for a specific design flood without consideration of aquatic species or the swimming and jumping abilities of a single target fish species and life stage during its migration, and ignored the movement needs of other adult fish, juveni...

During the last decade Stream Simulation has become a well established methodology as an ecological approach to providing Aquatic Organism Passage (AOP) at road stream crossing. USDA Forest Service San Dimas Technology and Development Center established a Stream Simulation Working Group to develop a stream simulation design methodology based on the...

During the past decade, research on large in-stream wood has expanded beyond North America's Pacific Northwest to diverse environments and has shifted toward increasingly holistic perspectives that incorporate processes of wood recruitment, retention, and loss at scales from channel segments to entire watersheds. Syntheses of this rapidly expanding...

Introduction Gravel augmentation for the purpose of spawning habitat improvement has occurred episodically by various government agencies since the 1960s, and renewed interest in gravel augmentation surfaced during the relicensing of numerous hydroelectric projects in the 1990s. From a scientific and engineering perspective, not much was known abou...

Glacial-lake outburst floods (GLOFs) on 3 September 1977 and 4 August 1985 dramatically modified channels and valleys in the Mount Everest region of Nepal by eroding, transporting, and depositing large quantities of sediment for tens of kilometres along the flood routes. The GLOF discharges were 7 to 60 times greater than normal floods derived from...

Glacial-lake outburst floods (GLOFs) in the Mount Everest region of Nepal on 3 September 1977 and 4 August 1985 dramatically modified channels and valleys in the region by eroding, transporting, and depositing large quantities of sediment for tens of kilometers along their flood routes. Prior to this research, the GLOF discharges had not been deter...

This edited volume was originally published in 2000 and presents a comprehensive, interdisciplinary review of issues related to inland flood hazards. It addresses physical controls on flooding, flood processes and effects, and responses to flooding, from the perspective of human, aquatic, and riparian communities. Individual chapter authors are rec...

A reservoir sediment release on the North Fork Poudre River supplied ~7000 m3 of silt- to pebble-sized sediment to an originally boulder bed channel. Deposition along the 12 km of channel downstream from the reservoir occurred primarily in pools. During the subsequent snowmelt hydrograph, sediment was progressively scoured from the upstream and the...

Extreme rainfall in June 1949 and November 1985 triggered numerous large debris flows on the steep slopes of North Fork Mountain, eastern West Virginia. Detailed mapping at four sites and field observations of several others indicate that the debris flows began in steep hillslope hollows, propagated downslope through the channel system, eroded chan...

Coarse-grained deposits produced by a rare, extreme flood in the Mt. Everest region of Nepal and fine-grained deposits produced by frequent, moderate floods along the Colorado River in and near the Grand Canyon, U.S.A. illustrate a wide range of depositional patterns, processes, and mechanics along resistant-boundary channels. Deposition processes...

Climatic wanning during the last 100 to 150 years has caused many alpine glaciers to thin and retreat (Grove, 1990; O’Connor and Costa, 1993; Evans and Clague, 1994). This glacial downwasting has disturbed geomorphic systems in mountainous environments, increasing the risk of geologic and hydrologic hazards such as glacial-lake outburst floods, lan...