Collaborative Research: Effects of Hydrologic Processes on In Situ Stress Transients

合作研究：水文过程对原地应力瞬变的影响

• 批准号: 0944315
• 负责人: Lawrence Murdoch
• 金额: $ 27.53万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2018-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944315&HistoricalAwards=false
• 关键词: Collaborative; Research; Effects; Hydrologic; Processes

Understanding how water moves and is stored within the landscape is among the most pervasive themes of hydrological research, but important aspects of the water cycle remain poorly known. The proposed research project will address current limitations in characterizing the water cycle and is motivated by two related hypotheses: 1. Hydrologically important changes in water content are sufficient to cause measurable changes in the in situ state of stress. 2. Transient changes of in situ stress can be used to estimate hydrologic fluxes and changes in storage over multiple scales.This investigation will develop conceptual and numerical methods for analyzing hydrologic processes associated with changes of in situ stress as well as instruments and field techniques for measuring these changes. New field instrumentation will be developed to measure total and effective stress changes with a target resolution of 1 Pa. A proof-of-concept field test near Clemson, SC will compare high resolution stress measurements to transient changes in water content and other processes. A more rigorous field test will take place in Kansas, where the method will be used to estimate changes in mass resulting from evapotranspiration and other effects in a riparian zone along the Arkansas River. Theoretical analyses of poroelasticity in the vadose and saturated zones will be used to evaluate how stresses are affected by changes in water content, as well as a variety of other potentially competing effects including barometric pressure change, subsurface geology, earth tides, ground water extraction, regional horizontal flows, surface impoundments, traffic, wind, temperature, etc. New field approaches are catalysts for discovery in hydrologic sciences, and the intellectual merit of the proposed investigation is that it has the potential to be such a catalyst for discovery. The investigation will provide the scientific basis for new field techniques, theoretical analyses and instrumentation that will advance the ability to characterize key aspects of the hydrological cycle (ET, change in soil moisture, recharge, stormflow, etc.) over scales from less than 1 m to greater than 100 m. The techniques developed for this project will have broad impacts by providing multi-scale data that can be used to improve: validation and calibration of remote sensing instruments and algorithms; estimates of melting or accumulation of snow pack or glaciers; assessment of rates of erosion or sediment deposition; reduction of noise and resolution of tectonic strain; assessment of rates of carbon storage; methods for scheduling irrigation; understanding mass changes resulting from forest fires, and related.

了解水如何在景观中移动和储存是水文研究中最普遍的主题之一，但水循环的重要方面仍然知之甚少。 拟议的研究项目将解决目前在表征水循环方面的局限性，并受到两个相关假设的激励：1。水文学上重要的含水量变化足以引起原地应力状态的可测量变化。 2. 原地应力的瞬时变化可用于估算水文通量和多尺度蓄水量的变化，本研究将发展分析与原地应力变化相关的水文过程的概念和数值方法，以及测量这些变化的仪器和现场技术。 将开发新的现场仪器，以测量总应力和有效应力变化，目标分辨率为1 Pa。 在南卡罗来纳州克莱姆森附近进行的一项概念验证现场试验将把高分辨率应力测量结果与含水量和其他过程的瞬态变化进行比较。 一个更严格的实地测试将在堪萨斯进行，在那里该方法将被用来估计在沿着阿肯色州河的河岸带由于蒸散和其他影响而导致的质量变化。 渗流和饱和带中孔隙弹性的理论分析将用于评估应力如何受到含水量变化的影响，以及各种其他潜在的竞争效应，包括气压变化，地下地质，固体潮汐，地下水提取，区域水平流，表面蓄水，交通，风，温度，新的现场方法是水文科学发现的催化剂，拟议调查的智力价值是，它有可能成为发现的催化剂。 调查将为新的现场技术、理论分析和仪器提供科学依据，这些技术、理论分析和仪器将提高描述水文循环关键方面（ET、土壤湿度变化、补给、暴雨流量等）的能力。从小于1米到大于100米的尺度。 为这一项目开发的技术将产生广泛的影响，因为它提供了多尺度数据，可用于改进：遥感仪器和算法的验证和校准;积雪或冰川融化或积累的估计;侵蚀或沉积速率的评估;噪音的减少和构造应变的分辨率;碳储存速率的评估;灌溉调度方法;了解森林火灾造成的质量变化，以及相关的。