Browsing by Author "Simons, Daryl B., author"

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Open Access
2' x 2' x 60' recirculating flume: terminal report
(Colorado State University. Libraries, 1964) Simons, Daryl B., author; Colorado State University, Civil Engineering Research Section, publisher
Open Access
8' x 4' x 200' adjustable recirculating flume
(Colorado State University. Libraries, 1965) Simons, Daryl B., author; Colorado State University, Civil Engineering Department, publisher
Open Access
A geomorphic study of Pools 24, 25, and 26 in the Upper Mississippi and Lower Illinois Rivers
(Colorado State University. Libraries, 1975-06) Simons, Daryl B., author; Schumm, S. A., author; Stevens, M. A., author; Chen, Y. H., author; Lagasse, Peter F. (Peter Frederick), 1937, author; Engineering Research Center, Colorado State University, publisher
This report is a study of the past and present geomorphic features of the reach of the Upper Mississippi River which includes Pools 24, 25, and 26 and the lower reach of the Illinois River. In addition, the report presents the anticipated future geomorphic changes that will result from past, present, and planned future developments of these reaches. The study was based primarily on data collected by the Corps of Engineers, aided with a mathematical model of the river system. On the basis of this study of the past geomorphic changes in Pools 24, 25, and 26 and with the mathematical simulation of future river response, it was concluded that 50 years from now the study area will be essentially as it is today. The present day manner of operation does not have any serious detrimental effects on the geomorphology or hydraulics of the river system in the study area.
Open Access
A mathematical model study of Pool 4 in the Upper Mississippi and Lower Chippewa Rivers
(Colorado State University. Libraries, 1976) Simons, Daryl B., author; Chen, Yung Hai, author; Colorado State University Engineering Research Center, publisher
Open Access
A study of flow in alluvial channels: depth-discharge relations
(Colorado State University. Libraries, 1959) Simons, Daryl B., author; Richardson, E. V. (Everett V.), 1924-, author; Colorado State University, publisher
Alluvial channel stage-discharge and depth-discharge relations were studied in a large sand bed-recirculating flume. From this study, it was found that the form of these relationships are intimately related to: 1. Regime of flow; 2. Form of bed roughness, a. Characteristics of the bed material, b. Concentration of fine sediment, c. Temperature; 3. Rate of change of discharge with time. In the range of shear where ripples and dunes develop on the bed, the stage-discharge curve for a rising stage is usually quite different from that for a falling stage. These curves are only valid for the conditions upon which they are based--no general solution is possible. In the range of shear, which develops plane bed, standing sand, and water waves, which are in phase, and antidunes, the rising and falling stage curves coincide and hold for all values of discharge associated with these forms of bed roughness. When a channel experiences a shear stress, which develops dunes at small discharges and plane bed and perhaps standing waves and antidunes at larger discharges, there is a discontinuity in the stage-discharge or depth-discharge curves particularly on the rising stage, which occurs when the dunes wash out. This is caused by the large reduction in resistance to flow, which occurs when the bed form changes from ripples or dunes to plane bed, standing waves, or antidunes, and the resultant reduction in depth even though discharge is increasing.
Open Access
A study of flow in alluvial channels: the effect of large concentrations of fine sediment on the mechanics of flow in a small flume
(Colorado State University. Libraries, 1960) Haushild, W. L., author; Simons, Daryl B., author; Richardson, E. V. (Everett V.), 1924-, author; United States Geological Survey, Colorado State University, publisher
A flume study was made using a natural river sand as the bed material, median diameter = 0.54 millimeters. Clear-water flow was compared with flow containing from 6,000 to 65,000 parts per million of fine sediment (bentonite). The study shows that the form of bed roughness could be changed by adding sufficient fine sediment (bentonite) to the clear-water flow. The total bed material transport was decreased by 50 percent with increasing fine sediment concentration with the dune bed form and was increased by as much as 550 percent for the transition, standing wave, and anti-tune forms of bed roughness. Resistance to flow was less (C/√g increased by 45 percent) with fine sediment-laden flow than with clear-water flow for the dune, and transition bed forms; and was greater (C/√g reduced by 25 percent) for the standing waves and the anti-dunes. A narrow range of bentonite concentration for each form of bed roughness was established as a limit below which only minor changes in bed form, bed material transport, and resistance to flow occurred. The variation of the liquid proper ties, specific weight and viscosity, for water-bentonite dispersions were studied and their effect on the properties of the bed material particles measured. The fall velocity of the particles in a dispersion of 100,000 parts per million fine sediment in water was reduced to about one-half their fall velocity in clear water.
Open Access
A study of rapidly varying flow in alluvial channels
(Colorado State University. Libraries, 1959) Simons, Daryl B., author; Richardson, E. V. (Everett V.), 1924-, author; Colorado State University, publisher
Open Access
A study of resistance to flow in alluvial channels
(Colorado State University. Libraries, 1959) Simons, Daryl B., author; Richardson, E. V. (Everett V.), 1924-, author; Colorado State University, publisher
This paper presents the initial results of a flume study of alluvial channels currently being conducted by the U.S. Geological Survey at Colorado State University. A detailed classification of the regimes of flow, the forms of bed roughness, and the basic concepts pertaining to resistance to now are discussed.
Open Access
A study of roughness in alluvial channels depth-discharge relations
(Colorado State University. Libraries, 1959) Simons, Daryl B., author; Richardson, E. V. (Everett V.), 1924-, author; Colorado State University, publisher
Open Access
A study of variables affecting flow characteristics and sediment transport in alluvial channels
(Colorado State University. Libraries, 1964-01-28-1964-02-01) Simons, Daryl B., author; Colorado State University, publisher
Open Access
A summary of The river environment
(Colorado State University. Libraries, 1976-06) Chen, Y. H., author; Lagasse, P. F., author; Schumm, S. A., author; Simons, Daryl B., author; Civil Engineering Department, Engineering Research Center, Colorado State University, publisher
Open Access
Analysis of data collection and processing system for Beaver Creek Watershed, Arizona
(Colorado State University. Libraries, 1981) Simons, Daryl B., author; Li, Ruh-Ming, author; Ward, Timothy J., author; Civil Engineering Department, Engineering Research Center, Colorado State University, publisher
Open Access
Analysis of hydraulic geometry relationships in alluvial channels
(Colorado State University. Libraries, 1984-04) Julien, Pierre Y., author; Simons, Daryl B., author; Department of Civil Engineering, Colorado State University, publisher
Open Access
Analysis of sediment transport equations for rainfall erosion
(Colorado State University. Libraries, 1984-06) Simons, Daryl B., author; Julien, Pierre Y., author; Civil Engineering Department, Engineering Research Center, Colorado State University, publisher
Open Access
Analysis of watersheds and river systems: short course
(Colorado State University. Libraries, 1979-05-06) Simons, Daryl B., author; Li, Ruh-Ming, author; Ward, Timothy J., author; Shen, H. W., author; Ponce, V. Miguel, author; Eggert, Kenneth G., author; Chen, Yung-Hai, author; Simons, Robert K., author; Brown, Glenn O., author; Duong, Nguyen, author
This short course is designed for individuals dealing with the analysis of watersheds and rivers. Practical applications concerning physical processes will be emphasized.
Open Access
Cluster analysis based on density estimates and its application to LANDSAT imagery
(Colorado State University. Libraries, 1980) Park, John Kyoungyoon, author; Chen, Yung Hai, author; Simons, Daryl B., author; Colorado State University, publisher
Open Access
Development of models for predicting water and sediment routing and yield from storms on small watersheds
(Colorado State University. Libraries, 1975-08) Simons, Daryl B., author; Li, R. M., author; Stevens, M. A., author; Civil Engineering Department, Engineering Research Center, Colorado State University, publisher
Open Access
Discussion of Design of alluvial channels as influenced by sediment charge by Mushtaq Ahmad Abdur Rehman
(Colorado State University. Libraries, 1962) Simons, Daryl B., author; Colorado State University, publisher
Open Access
Dynamic water routing using a predictor-corrector method with sediment routing
(Colorado State University. Libraries, 1982) Simons, Daryl B., author; Li, Ruh Ming, author; Garbrecht, Jürgen, author; Simons, Robert K., author; Colorado Water Resources Research Institute, Colorado State University, publisher
Open Access
Effect of sediment on resistance to flow in cobble and boulder bed rivers
(Colorado State University. Libraries, 1978-05) Simons, Daryl B., author; Li, Ruh Ming, author; Al-Shaikh-Ali, Khalid Saddiq, author; Department of Civil Engineering, Colorado State University, publisher
Field and experimental evidence are presented to demonstrate the importance of the inflow of sand and gravel size sediments, released under extreme floods from watersheds and banks of streams, on resistance to flow in channels whose beds are formed of large size roughness elements such as cobbles, rocks and boulders. The released sediments fill the spacings between the large size roughness elements, and may inundate them completely, forcing the channel to behave as a sand bed channel at a much reduced resistance to flow coefficient. Under extreme conditions resistance to flow in these channels decrease to more than one-third its original value resulting in an underestimations of the following quantities: water discharge by a factor of two, sediment discharge by a factor ranging between 8 and 64, velocity of flow by a factor of two. Furthermore, an overestimation of flow depth by a factor of two can result. Impacts of failure to estimate the previous quantities with a reasonable degree of accuracy are: underestimation of the actual quantity of available water, improper selection of bank protection material, overestimation of reservoir life, unsafe design of scour depths at hydraulic structures, improper design of highway location as well as others relating to river control and development.