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• 41. [Article] A general theory of flooding implementing the cuspoid catastrophe

  The flooding phenomenon can be defined as the maximum attainable flow condition beyond which the well defined countercurrent flow pattern can no longer exist. Thus the countercurrent flow limit (CCFL) ...

  Citation × Citation Citation Abstract Copy Title: A general theory of flooding implementing the cuspoid catastrophe Author: Lafi, Abd Y. The flooding phenomenon can be defined as the maximum attainable flow condition beyond which the well defined countercurrent flow pattern can no longer exist. Thus the countercurrent flow limit (CCFL) or the flooding limit may be thought of as the flow condition at which the strong interaction between the two phases occurs. Considerable effort has been devoted to understanding and analyzing the flooding transition in many fields. For example; the flooding phenomenon is one of the important phenomena encountered in the safety analysis of light water reactors (pressurized water reactors and boiling water reactors). Accurate predictions of flooding behavior are particularly important in the assessment of emergency core cooling system (ECCS) performance. Currently, the postulated loss-of-coolant accident (LOCA) is considered the design basis accident. A physical understanding of the flooding phenomenon will help assess core refill during the course of a LOCA. Understanding the physical mechanisms of the flooding phenomenon might help establish more reliable equations and correlations which accurately describe the thermal hydraulic behavior of the system. The models can provide best-estimate capability to the design codes used in the evaluation of ECCS performance. The primary concern of this study was to: 1. Understand the physical mechanisms involved in the flooding phenomenon in order to derive a suitable analytical model. 2. Show that the combination of: a. Linear Instability Theory b. Kinematic Wave Theory c. Catastrophe Theory can provide a general model for flooding phenomenon. The theoretical model derived using the aforementioned combination of theories indicates good agreement between the experimental and the predicted values. Comparisons have been made using a large volume of air-water flooding data. Title: A general theory of flooding implementing the cuspoid catastrophe Author: Lafi, Abd Y. The flooding phenomenon can be defined as the maximum attainable flow condition beyond which the well defined countercurrent flow pattern can no longer exist. Thus the countercurrent flow limit (CCFL) or the flooding limit may be thought of as the flow condition at which the strong interaction between the two phases occurs. Considerable effort has been devoted to understanding and analyzing the flooding transition in many fields. For example; the flooding phenomenon is one of the important phenomena encountered in the safety analysis of light water reactors (pressurized water reactors and boiling water reactors). Accurate predictions of flooding behavior are particularly important in the assessment of emergency core cooling system (ECCS) performance. Currently, the postulated loss-of-coolant accident (LOCA) is considered the design basis accident. A physical understanding of the flooding phenomenon will help assess core refill during the course of a LOCA. Understanding the physical mechanisms of the flooding phenomenon might help establish more reliable equations and correlations which accurately describe the thermal hydraulic behavior of the system. The models can provide best-estimate capability to the design codes used in the evaluation of ECCS performance. The primary concern of this study was to: 1. Understand the physical mechanisms involved in the flooding phenomenon in order to derive a suitable analytical model. 2. Show that the combination of: a. Linear Instability Theory b. Kinematic Wave Theory c. Catastrophe Theory can provide a general model for flooding phenomenon. The theoretical model derived using the aforementioned combination of theories indicates good agreement between the experimental and the predicted values. Comparisons have been made using a large volume of air-water flooding data. Close

• 42. [Article] Jordan Valley : Flood damage prevention ordinance

  11 pp. Bookmarks supplied by UO. Adopted December 16, 1980; amended May 8, 1990. Captured April 8, 2009.

  Citation × Citation Citation Abstract Copy Title: Jordan Valley : Flood damage prevention ordinance Author: Jordan Valley (Or.) Year: 2009, 1980 11 pp. Bookmarks supplied by UO. Adopted December 16, 1980; amended May 8, 1990. Captured April 8, 2009. Title: Jordan Valley : Flood damage prevention ordinance Author: Jordan Valley (Or.) Year: 2009, 1980 11 pp. Bookmarks supplied by UO. Adopted December 16, 1980; amended May 8, 1990. Captured April 8, 2009. Close

• 43. [Article] Ancient Cataclysmic Floods in the Pacific Northwest: Ancestors to the Missoula Floods

  Ancient Cataclysmic Floods were the Ice Age Floods that left erosional and depositional features and preceded the Missoula Floods (15-18,000 ka) in the Pacific Northwest of the United States (Allen et ...

  Citation × Citation Citation Abstract Copy Title: Ancient Cataclysmic Floods in the Pacific Northwest: Ancestors to the Missoula Floods Author: Medley, Erica Year: 2012 Ancient Cataclysmic Floods were the Ice Age Floods that left erosional and depositional features and preceded the Missoula Floods (15-18,000 ka) in the Pacific Northwest of the United States (Allen et al., 2009). All previously studied ancient sites were visited (14) and new sites (11) were found; four Missoula Flood quarries were also visited; a total of 29 sites were studied in this thesis. The use of calcrete paleosols to provide relative age dates for flood deposits was analyzed in this thesis. Missoula Flood gravel pits were sampled in order to examine the degree of calcrete development in flood deposits of known ages. All of the Missoula Flood deposits tested contain Stage 1 calcrete soil development. Calcrete paleosols at sites with evidence for older floods were all analyzed. Eight sites have paleosols with Stage II development (3-12% CaCO3): Rulo Outcrop, Potholes Coulee, Leslie Road, Benge, E. Callaway Road, Collier Coulee, Palouse, and Connell. Five sites have paleosols with Stage II+ development (12-17% CaCO3): Brown Road, Leslie Road, Benge, Reese Coulee, and Connell. Fourteen sites have paleosols with Stage III development (17-35% CaCO3): The Dalles, Rulo Outcrop, Winans Road 1, Poplar Heights, Yakima Bluffs, Canal Outcrop, Othello Canal, Reese Coulee, Potholes Coulee, E. Callaway Road, Frenchmen Coulee, Macall, Ritzville, and East Connell. One site has a paleosol with Stage III+ development (35-50% CaCO3): Othello Canal. Ancient Cataclysmic flooding initiated in the Early Pleistocene, at least 1.5 Ma. Sixteen field sites show evidence for Early Pleistocene flooding, preserved in all six provinces: Othello Channels, Columbia River Gorge, Cheney-Palouse Scabland, Quincy Basin, Pasco Basin, and the Walla Walla Valley. There are 26 field sites with evidence for Middle Pleistocene flooding, present in all regions except Othello Channels. Eleven of those 26 sites also show evidence for Early Pleistocene floods. Evidence for Early and Middle Pleistocene floods is present over a wide distribution of elevations from 117 to 524 meters. Title: Ancient Cataclysmic Floods in the Pacific Northwest: Ancestors to the Missoula Floods Author: Medley, Erica Year: 2012 Ancient Cataclysmic Floods were the Ice Age Floods that left erosional and depositional features and preceded the Missoula Floods (15-18,000 ka) in the Pacific Northwest of the United States (Allen et al., 2009). All previously studied ancient sites were visited (14) and new sites (11) were found; four Missoula Flood quarries were also visited; a total of 29 sites were studied in this thesis. The use of calcrete paleosols to provide relative age dates for flood deposits was analyzed in this thesis. Missoula Flood gravel pits were sampled in order to examine the degree of calcrete development in flood deposits of known ages. All of the Missoula Flood deposits tested contain Stage 1 calcrete soil development. Calcrete paleosols at sites with evidence for older floods were all analyzed. Eight sites have paleosols with Stage II development (3-12% CaCO3): Rulo Outcrop, Potholes Coulee, Leslie Road, Benge, E. Callaway Road, Collier Coulee, Palouse, and Connell. Five sites have paleosols with Stage II+ development (12-17% CaCO3): Brown Road, Leslie Road, Benge, Reese Coulee, and Connell. Fourteen sites have paleosols with Stage III development (17-35% CaCO3): The Dalles, Rulo Outcrop, Winans Road 1, Poplar Heights, Yakima Bluffs, Canal Outcrop, Othello Canal, Reese Coulee, Potholes Coulee, E. Callaway Road, Frenchmen Coulee, Macall, Ritzville, and East Connell. One site has a paleosol with Stage III+ development (35-50% CaCO3): Othello Canal. Ancient Cataclysmic flooding initiated in the Early Pleistocene, at least 1.5 Ma. Sixteen field sites show evidence for Early Pleistocene flooding, preserved in all six provinces: Othello Channels, Columbia River Gorge, Cheney-Palouse Scabland, Quincy Basin, Pasco Basin, and the Walla Walla Valley. There are 26 field sites with evidence for Middle Pleistocene flooding, present in all regions except Othello Channels. Eleven of those 26 sites also show evidence for Early Pleistocene floods. Evidence for Early and Middle Pleistocene floods is present over a wide distribution of elevations from 117 to 524 meters. Close

• 44. [Image] 1964 Corvallis, Oregon Flood

  	Avery Park
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 Avery Park Title: 1964 Corvallis, Oregon Flood Year: 1964 Avery Park Close

• 45. [Image] 1964 Corvallis, Oregon Flood

  	New bridge Corvallis
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 New bridge Corvallis Title: 1964 Corvallis, Oregon Flood Year: 1964 New bridge Corvallis Close

• 46. [Image] 1964 Corvallis, Oregon Flood

  	Corvallis East-Housing Dev.; 12:30 PM
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 Corvallis East-Housing Dev.; 12:30 PM Title: 1964 Corvallis, Oregon Flood Year: 1964 Corvallis East-Housing Dev.; 12:30 PM Close

• 47. [Image] 1964 Corvallis, Oregon Flood

  	East Corvallis; 11:00 AM; Water 23'
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 East Corvallis; 11:00 AM; Water 23' Title: 1964 Corvallis, Oregon Flood Year: 1964 East Corvallis; 11:00 AM; Water 23' Close

• 48. [Image] 1964 Corvallis, Oregon Flood

  	East Corvallis-Van Buren bridge; 11:00 AM
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 East Corvallis-Van Buren bridge; 11:00 AM Title: 1964 Corvallis, Oregon Flood Year: 1964 East Corvallis-Van Buren bridge; 11:00 AM Close

• 49. [Image] 1964 Corvallis, Oregon Flood

  	South Corvallis; 11:00 AM; Water 23'
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 South Corvallis; 11:00 AM; Water 23' Title: 1964 Corvallis, Oregon Flood Year: 1964 South Corvallis; 11:00 AM; Water 23' Close

• 50. [Image] 1964 Corvallis, Oregon Flood

  	North Corvallis
  	Citation × Citation Citation Abstract Copy Title: 1964 Corvallis, Oregon Flood Year: 1964 North Corvallis Title: 1964 Corvallis, Oregon Flood Year: 1964 North Corvallis Close