A Field Based Process Study of Subaqueous Hydraulic Jumps inDebris and Turbidity Flows

泥石流和浊流中水下水跃的现场过程研究

• 批准号: 8616067
• 负责人: Frank Weirich
• 金额: $ 11.25万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-01-01 至 1989-10-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8616067&HistoricalAwards=false
• 关键词: Field; Based; Process; Study; Subaqueous

An integrated, field based project will be carried out to: (a) continuously monitor subaqueous debris and turbidity flows for temperature, density, velocity, and travel distance in a reservoir environment; (b) study flow conversions of debris flows to turbidity currents, specifically by means of hydraulic jumps, and the role of bottom geometry in such conversions; and (c) correlate the characteristics of the flow with the nature of the sediment deposition/erosion processes, the bottom geometry, and other parameters governing the transport processes. The work will be conducted in conjunction with a project jointly funded by the U.S. Forest Service, the Los Angeles County Fire Department, and the L.A. Flood Control District, in which controlled fires, pollutant and smoke effects, sediment yields, and debris flows emanating from the burned areas are being studied. The site is the Lodi Canyon and Puddingstone Diversion Reservoir, located in the San Gabriel Mountains near Los Angeles, that has long hydrologic and sediment records, detailed geologic and geomorphic data available, a single sediment input source, a reservoir of manageable size, and other convenient characteristics and conditions. The results from this work will help increase the accuracy of predictions of the movement patterns and incidence of subaqueous debris and turbidity flows; the determination of threshold conditions; the probable travel distance of such events; and an assessment of both the ability of subaqueous hydraulic jumps to control the deposition of sediments; and the possible engineered use of these jumps to control the location of sediment during major flood events.

将执行一个基于现场的综合项目，以便：(a)持续监测水下碎屑和浑浊流在储层环境中的温度、密度、速度和移动距离；(b)研究泥石流向浑浊流的转换，特别是通过水力跳跃的方式，以及底部几何形状在这种转换中的作用；(c)将水流特征与泥沙沉积/侵蚀过程的性质、底部几何形状和控制运输过程的其他参数联系起来。这项工作将与美国林务局、洛杉矶县消防局和洛杉矶防洪区联合资助的一个项目一起进行，该项目正在研究受控火灾、污染物和烟雾的影响、沉积物的产生以及燃烧区域产生的泥石流。地点是洛迪峡谷和普丁斯通导流水库，位于洛杉矶附近的圣盖博山脉，有长期的水文和沉积物记录，详细的地质和地貌数据，单一的沉积物输入源，可管理的水库规模，以及其他便利的特征和条件。这项工作的结果将有助于提高对水下碎屑和浊流的运动模式和发生率的预测的准确性；阈值条件的确定；传播距离：这类事件的可能传播距离；并对水下水力跳跃控制沉积物沉积的能力进行了评价；以及在大洪水期间利用这些跳跃来控制沉积物位置的可能性。