Geoökologisches Kolloquium SS 2008
Dr. Jim Constantz
U.S. Geological Survey, Menlo Park, California
Monday, 19.05.2008 14:15, H 6
Heat as a Tracer of Stream Exchanges with Ground Water
Recent improvements in both automated temperature-data acquisition and simulation modeling of heat and ground-water transport, are leading to widespread implementation of heat as a tracer of ground-water fluxes near streams. The presentation provides a brief historical review of the use of heat as a tracer of shallow ground-water movement, and details current theory used to estimate stream exchanges with ground water. The governing equations for heat and ground-water transport in the near-stream environment are presented. The various relations between the hydrologic state of a stream channel and the expected thermal response is graphical depicted. Techniques for installation and monitoring of temperature and stage equipment are discussed for a range of hydrological environments. These techniques are divided into direct measurement techniques in streams and sediments, indirect techniques relying on near-stream observation wells, and remote sensing and other technically advanced temperature acquisition techniques.As a result presumably of a natural sense of heat, temperature is graphical visualized more often and diversely than other environmental parameters. Visualizations of stream and streambed temperature patterns are discussed using thermographs, temperature envelopes, and 1-, 2-, and 3-dimensional temperature contour plots.
Methods of analysis of observed temperatures include simple heat-pulse arrival-time and heat-loss procedures, analytical and time-series solutions, and heat and water transport simulation models. Applications of heat as tracer are presented for a variety of stream sites, ranging from a large bank filtration facility on the Russian River in northern California to ephemeral arroyos (wadis) in the desert Southwest bordering Mexico.
The BayCEER Colloquium serves as an interdisciplinary platform for students, academics and interested citizens: during the lecture period, guests and members of BayCEER give insights into their research, which can then be discussed in plenary and in a relaxed atmosphere during the post-colloquium.
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