Modeling, Laboratory and Field Studies of Patterned Ground

图案地面的建模、实验室和现场研究

• 批准号: 8922548
• 负责人: William Krantz
• 金额: $ 11.9万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922548&HistoricalAwards=false
• 关键词: Modeling; Laboratory; Field; Studies; Patterned

A model for sorted patterned ground shows that some types arise from density-driven Rayleigh free convection during thawing of water-saturated recurrently frozen soils. The regularly spaced convection cells result in an uneven melting of the underlying ice front. Frost action causes stones to be upthrusted and to form in a pattern on the ground surface that mirrors the corrugation in the underlying ice front. This award supports field work, laboratory experiments, and modeling studies focused on obtaining pattern width-to-depth ratios for underwater polygons. These will be supported by laboratory studies of underwater polygons. A novel feature of the field and laboratory studies is the use of infrared thermography to detect the free convection flows which precede any visible patterning. Modeling studies will support these experimental investigations of sorted polygons. Modeling studies will also be pursued to determine the differential thaw penetration due to the heat transfer associated with free convection in the active layer.

分类图案地面的模型表明， 由密度驱动的瑞利自由对流引起， 水饱和循环冻土的解冻。 的 规则间隔的对流单体导致不均匀的 底层冰锋的融化 霜冻作用原因 石头被向上推，并形成一个模式， 地面，反映了 下伏冰锋 该奖项支持现场工作，实验室实验， 模拟研究的重点是获得模式的宽度到深度 水下多边形的比率。 这些将得到以下方面的支持： 水下多边形的实验室研究。 一个新颖特征 在野外和实验室研究中， 热成像检测自由对流， 在任何可见的图案之前。 建模研究将 支持这些实验研究的排序 多边形 还将进行建模研究， 确定由于热量引起的不同的解冻渗透 与活动层中的自由对流相关的转移。