David M Rubin
Scientist Emeritus, Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 59
Nonperiodic eddy pulsations
Recirculating flow in lateral separation eddies is typically weaker than main stem flow and provides an effective environment for trapping sediment. Observations of recirculating flow and sedimentary structures demonstrate that eddies pulsate in size and in flow velocity even when main stem flow is steady. Time series measurements of flow velocity and location of the reattachment point indicate th
Authors
David M. Rubin, Richard R. McDonald
Internal structure of bars in Grand Canyon, Arizona, and evaluation of proposed flow alternatives for Glen Canyon Dam
No abstract available.
Authors
David M. Rubin, J. C. Schmidt, R. A. Anima, K. M. Brown, R. E. Hunter, Hiroshi Ikeda, B. E. Jaffe, R. R. McDonald, J. M. Nelson, T. E. Reiss, Rex Sanders, R. G. Stanley
Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space
No abstract available.
Authors
David M. Rubin, Roberto J. Anima, Rex Sanders
Clastic pipes of probable solution-collapse origin in Jurassic rocks of the southern San Juan Basin, New Mexico
No abstract available.
Authors
Ralph E. Hunter, Guy R. Gelfenbaum, David M. Rubin
Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows
For more than a century geologists have wondered why some bedforms are orientated roughly transverse to flow, whereas others are parallel or oblique to flow. This problem of bedform alignment was studied experimentally using subaqueous dunes on a 3–6-m-diameter sand-covered turntable on the floor of a 4-m-wide flume.In each experiment, two flow directions (relative to the bed) were produced by alt
Authors
David M. Rubin, Hiroshi Ikeda
Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows
For more than a century geologists have wondered why some bedforms are orientated roughly transverse to flow, whereas others are parallel or oblique to flow. This problem of bedform alignment was studied experimentally using subaqueous dunes on a 3–6-m-diameter sand-covered turntable on the floor of a 4-m-wide flume.
In each experiment, two flow directions (relative to the bed) were produced
Authors
David M. Rubin, Hiroshi Ikeda
Origin, structure, and evolution of a reattachment bar, Colorado River, Grand Canyon, Arizona
In a channel expansion, flow can separate from the bank, creating a zone of relatively weak recirculating current. Bars that accumulate in this weak flow near the point where flow reattaches to the bank are called reattachment bars. As a reattachment bar evolves, the recirculation zone may fill with sediment and restrict flow from the main channel. The increasingly restricted flow over the bar cau
Authors
David M. Rubin, John C. Schmidt, Johnnie N. Moore
Field guide to sedimentary structures in the Navajo and Entrada sandstones in southern Utah and northern Arizona
This field-trip guide describes the common sedimentary structures that occur in eolian sands. The outcrops that are described occur in the Navajo and Entrada Sandstones between the areas of Page, Arizona and St. George, Utah (figure I), but the sedimentary structures of these two sandstones are typical of most eolian deposits. The main part of the guide discusses the geologic setting and the origi
Authors
David M. Rubin, Ralph E. Hunter
Why deposits of longitudinal dunes are rarely recognized in the geologic record
Dunes that are morphologically of linear type, many of which are probably of longitudinal type in a morphodynamic sense, are common in modern deserts, but their deposits are rarely identified in aeolian sandstones. One reason for non-recognition of such dunes is that they can migrate laterally when they are not exactly parallel to the long-term sand-transport direction, thereby depositing cross-st
Authors
David M. Rubin, Ralph E. Hunter
Sea-floor-mounted rotating side-scan sonar for making time-lapse sonographs
A rotating side-scan sonar system was designed to make time-lapse sonographs of a circular area of the sea floor. To construct the system, the transducers of a commercial side-scan system (frequency 105 kHz; pulse length 0.1 ms; horizontal beam width 1°; vertical beam width 20°; beam depressed 10° with respect to horizontal) were mounted 2 m above the sea floor on a vertical shaft that had a rotat
Authors
David M. Rubin, David S. McCulloch, H. R. Hill
The movement and equilibrium of bedforms in central San Francisco Bay
No abstract available.
Authors
David M. Rubin, David S. McCulloch
Science and Products
Filter Total Items: 59
Nonperiodic eddy pulsations
Recirculating flow in lateral separation eddies is typically weaker than main stem flow and provides an effective environment for trapping sediment. Observations of recirculating flow and sedimentary structures demonstrate that eddies pulsate in size and in flow velocity even when main stem flow is steady. Time series measurements of flow velocity and location of the reattachment point indicate th
Authors
David M. Rubin, Richard R. McDonald
Internal structure of bars in Grand Canyon, Arizona, and evaluation of proposed flow alternatives for Glen Canyon Dam
No abstract available.
Authors
David M. Rubin, J. C. Schmidt, R. A. Anima, K. M. Brown, R. E. Hunter, Hiroshi Ikeda, B. E. Jaffe, R. R. McDonald, J. M. Nelson, T. E. Reiss, Rex Sanders, R. G. Stanley
Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space
No abstract available.
Authors
David M. Rubin, Roberto J. Anima, Rex Sanders
Clastic pipes of probable solution-collapse origin in Jurassic rocks of the southern San Juan Basin, New Mexico
No abstract available.
Authors
Ralph E. Hunter, Guy R. Gelfenbaum, David M. Rubin
Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows
For more than a century geologists have wondered why some bedforms are orientated roughly transverse to flow, whereas others are parallel or oblique to flow. This problem of bedform alignment was studied experimentally using subaqueous dunes on a 3–6-m-diameter sand-covered turntable on the floor of a 4-m-wide flume.In each experiment, two flow directions (relative to the bed) were produced by alt
Authors
David M. Rubin, Hiroshi Ikeda
Flume experiments on the alignment of transverse, oblique, and longitudinal dunes in directionally varying flows
For more than a century geologists have wondered why some bedforms are orientated roughly transverse to flow, whereas others are parallel or oblique to flow. This problem of bedform alignment was studied experimentally using subaqueous dunes on a 3–6-m-diameter sand-covered turntable on the floor of a 4-m-wide flume.
In each experiment, two flow directions (relative to the bed) were produced
Authors
David M. Rubin, Hiroshi Ikeda
Origin, structure, and evolution of a reattachment bar, Colorado River, Grand Canyon, Arizona
In a channel expansion, flow can separate from the bank, creating a zone of relatively weak recirculating current. Bars that accumulate in this weak flow near the point where flow reattaches to the bank are called reattachment bars. As a reattachment bar evolves, the recirculation zone may fill with sediment and restrict flow from the main channel. The increasingly restricted flow over the bar cau
Authors
David M. Rubin, John C. Schmidt, Johnnie N. Moore
Field guide to sedimentary structures in the Navajo and Entrada sandstones in southern Utah and northern Arizona
This field-trip guide describes the common sedimentary structures that occur in eolian sands. The outcrops that are described occur in the Navajo and Entrada Sandstones between the areas of Page, Arizona and St. George, Utah (figure I), but the sedimentary structures of these two sandstones are typical of most eolian deposits. The main part of the guide discusses the geologic setting and the origi
Authors
David M. Rubin, Ralph E. Hunter
Why deposits of longitudinal dunes are rarely recognized in the geologic record
Dunes that are morphologically of linear type, many of which are probably of longitudinal type in a morphodynamic sense, are common in modern deserts, but their deposits are rarely identified in aeolian sandstones. One reason for non-recognition of such dunes is that they can migrate laterally when they are not exactly parallel to the long-term sand-transport direction, thereby depositing cross-st
Authors
David M. Rubin, Ralph E. Hunter
Sea-floor-mounted rotating side-scan sonar for making time-lapse sonographs
A rotating side-scan sonar system was designed to make time-lapse sonographs of a circular area of the sea floor. To construct the system, the transducers of a commercial side-scan system (frequency 105 kHz; pulse length 0.1 ms; horizontal beam width 1°; vertical beam width 20°; beam depressed 10° with respect to horizontal) were mounted 2 m above the sea floor on a vertical shaft that had a rotat
Authors
David M. Rubin, David S. McCulloch, H. R. Hill
The movement and equilibrium of bedforms in central San Francisco Bay
No abstract available.
Authors
David M. Rubin, David S. McCulloch