Stream temperature response to three riparian vegetation scenarios by use of a distributed temperature validated model.
Elevated in-stream temperature has led to a surge in the occurrence of parasitic intrusion proliferative kidney disease and has resulted in fish kills throughout Switzerland's waterways. Data from distributed temperature sensing (DTS) in-stream measurements for three cloud-free days in August 2007 over a 1260 m stretch of the Boiron de Merges River in southwest Switzerland were used to calibrate and validate a physically based one-dimensional stream temperature model. Stream temperature response to three distinct riparian conditions were then modeled: open, in-stream reeds, and forest cover. Simulation predicted a mean peak stream temperature increase of 0.7 °C if current vegetation was removed, an increase of 0.1 °C if dense reeds covered the entire stream reach, and a decrease of 1.2 °C if a mature riparian forest covered the entire reach. Understanding that full vegetation canopy cover is the optimal riparian management option for limiting stream temperature, in-stream reeds, which require no riparian set-aside and grow very quickly, appear to provide substantial thermal control, potentially useful for land-use management.
Department of Water Resource Engineering Oregon State University, 116 Gilmore Hall, Corvallis, Oregon 97331, USA. rothtra@engr.orst.edu
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Roth
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Westhoff
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Rubin
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Vetterli
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D003247:Conservation of Natural Resources / Q000379:methods*; D004784:Environmental Monitoring; D008954:Models, Biological; D008956:Models, Chemical; D063245:Plant Development; D045483:Rivers / Q000737:chemistry*; D013557:Switzerland; D013696:Temperature; D014872:Water Movements