P2C2: Multi-Century Streamflow Derived from Watershed Modeling and Tree-Ring Data

P2C2：从流域建模和树木年轮数据得出的多世纪径流

• 批准号: 0823480
• 负责人: Franco Biondi
• 金额: $ 29.18万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0823480&HistoricalAwards=false
• 关键词: P2C2; Multi; Century; Streamflow; Derived

Funding is provided to test a new technique in an effort to quantify the effect of watershed topography, vegetation dynamics, natural disturbance, and land use changes on proxy-augmented stream-flow records. The technique combines hydrological parameters derived from tree-ring records coupled with a mechanistic model. The premise of the research is that dendrohydrologists have employed sophisticated regression techniques to extend runoff records, but this empirical approach cannot directly test the influence of watershed factors that alter stream-flow independent of climate. The researchers posit that such a new approach can help better define uncertainty in paleoclimate reconstructions because it employs tree-ring records to generate long time series of precipitation and possibly temperature which then can be used as input to a mechanistic watershed model to calculate stream-flow. The analysis will be conducted with data from the upper reaches of the Walker River on the boundary between the Sierra Nevada of California and the Great Basin of Nevada. The researchers have already generated a 2,300-year tree-ring record of water-year precipitation from the region and will use this time series as a basis for analysis. The broader impacts involve supporting an undergraduate and graduate student during the length of the project as well as providing a new methodology for using tree-ring data to assess hydroclimatic variability.

提供资金用于测试一项新技术，以努力量化流域地形、植被动态、自然干扰和土地利用变化对代理增强的径流记录的影响。该技术结合了从树木年轮记录中获得的水文参数，并结合了一个机械模型。这项研究的前提是，树状水文学家使用了复杂的回归技术来扩展径流记录，但这种经验方法不能直接测试与气候无关的改变径流的分水岭因素的影响。研究人员假设，这种新的方法可以帮助更好地定义古气候重建中的不确定性，因为它使用树轮记录来生成长时间的降水和可能的温度序列，然后可以将这些序列用作机械分水岭模型的输入，以计算河流流量。这项分析将使用加利福尼亚州内华达山脉和内华达州大盆地之间沃克河上游的数据进行。研究人员已经生成了该地区2300年来的树木年轮降水记录，并将利用这一时间序列作为分析的基础。更广泛的影响包括在项目期间支持本科生和研究生，以及提供一种利用年轮数据评估水文气候变异性的新方法。