U.S.-Germany Cooperative Research on Sediment Acoustic Properties

美德沉积物声学特性合作研究

• 批准号: 9214096
• 负责人: Roy Wilkens
• 金额: $ 1.2万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214096&HistoricalAwards=false
• 关键词: U.S.; Germany; Cooperative; Research; Sediment

9214096 Wilkens This award supports Professor Roy H. Wilkens and a graduate student from the University of Hawaii for international collaboration with Dr. Jurgen Mienert and others of GEOMAR, a marine geological institute in Kiel, Germany. These two groups share an interest in the measurement and interpretation of acoustic properties and the acoustic stratigraphy of the seafloor under the deep ocean. They plan to investigate in great detail the variations in several physical properties in the upper zone of these seafloor sediments. The German research group has been developing geophysical instrumentation complementary to some being developed at the University of Hawaii. Professor Wilkens and his student have been invited to join in the planning for and accompany the Germans on at least one cruise aboard a German research vessel. Both U. S. and German scientific programs will benefit greatly from the proposed combination of measuring techniques and oceanographic expertise. The upper ten meters of the seafloor contain the largest gradients in physical and acoustic proerties in the sediment- seawater system. Within this zone, porosity may change by 20- 30% and density may vary by as much as 50% Modern geophysical instrumentation such as that being developed by the participating research groups is making it possible to locate precisely and sample the discontinuities where sediment composition or microstructure changes. Examining such samples reveals the nature of the changes in the sediment and can provide evidence of changes in paleo-environmental conditions. Such data are extremely valuable in studies of local and global climate change. ***

9214096威尔肯斯该奖项奖励罗伊·H·威尔肯斯教授和夏威夷大学的一名研究生，以表彰他们与德国基尔海洋地质研究所的于尔根·米恩特博士和其他人的国际合作。这两个小组都对测量和解释深海海底的声学特性和声学地层学感兴趣。他们计划非常详细地调查这些海底沉积物上层几种物理性质的变化。德国研究小组一直在开发与夏威夷大学正在开发的一些地球物理仪器相补充的地球物理仪器。威尔肯斯教授和他的学生被邀请参与一艘德国考察船上至少一次德国人的巡航计划并陪同他们。美国和德国的科学项目都将从拟议的测量技术和海洋学专业知识的结合中受益匪浅。在沉积物-海水系统中，海底上部10米处包含最大的物理和声学特性梯度。在这一区域内，孔隙度可能变化20%-30%，密度变化可能高达50%。现代地球物理仪器，如参与研究小组正在开发的仪器，使精确定位和采样沉积物成分或微结构变化的不连续成为可能。对这些样品的研究揭示了沉积物变化的性质，并可以提供古环境条件变化的证据。这些数据在研究当地和全球气候变化方面非常有价值。***