Print Email Facebook Twitter Quantifying hyporheic exchange at high spatial resolution using natural temperature variations along a first?order stream Title Quantifying hyporheic exchange at high spatial resolution using natural temperature variations along a first?order stream Author Westhoff, M.C. Gooseff, M.N. Bogaard, T.A. Savenije, H.H.G. Faculty Civil Engineering and Geosciences Department Water Management Date 2011-10-12 Abstract Hyporheic exchange is an important process that underpins stream ecosystem function, and there have been numerous ways to characterize and quantify exchange flow rates and hyporheic zone size. The most common approach, using conservative stream tracer experiments and 1?D solute transport modeling, results in oversimplified representations of the system. Here we present a new approach to quantify hyporheic exchange and the size of the hyporheic zone (HZ) using high?resolution temperature measurements and a coupled 1?D transient storage and energy balance model to simulate in?stream water temperatures. Distributed temperature sensing was used to observe in?stream water temperatures with a spatial and temporal resolution of 2 and 3 min, respectively. The hyporheic exchange coefficient (which describes the rate of exchange) and the volume of the HZ were determined to range between 0 and 2.7 × 10?3 s?1 and 0 and 0.032 m3 m?1, respectively, at a spatial resolution of 1–10 m, by simulating a time series of in?stream water temperatures along a 565 m long stretch of a small first?order stream in central Luxembourg. As opposed to conventional stream tracer tests, two advantages of this approach are that exchange parameters can be determined for any stream segment over which data have been collected and that the depth of the HZ can be estimated as well. Although the presented method was tested on a small stream, it has potential for any stream where rapid (in regard to time) temperature change of a few degrees can be obtained. Subject DTShyporheic exchangetemperaturetransient storage To reference this document use: http://resolver.tudelft.nl/uuid:95fca131-dcd6-483a-8775-3d9012001b7a DOI https://doi.org/10.1029/2010WR009767 Publisher American Geophysical Union Embargo date 2012-04-12 ISSN 0043-1397 Source Water Resources Research, 47, 2011 Part of collection Institutional Repository Document type journal article Rights (c) 2011 American Geophysical Union Files PDF Westhoff_2011.pdf 1.81 MB Close viewer /islandora/object/uuid:95fca131-dcd6-483a-8775-3d9012001b7a/datastream/OBJ/view