Summer Temperature Patterns in Headwater Streams of the Oregon Coast Range1

Journal of the American Water Resources Association - Tập 44 Số 4 - Trang 803-813 - 2008
Liz Dent1, Danielle Vick2, Kyle Abraham3, Stephen H. Schoenholtz4, Sherri L. Johnson5
1Respectively, Hydrologist and Aquatic Specialist, Oregon Department of Forestry, 2600 State Street, Salem, Oregon 97310
2Hydrologist, New Mexico Interstate Stream Commission, Santa Fe, New Mexico 25102
3Monitoring Specialist, Oregon Department of Forestry, Salem, Oregon 97310
4Director, Virginia Water Resources Research Center, College of Natural Resources, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
5Research Ecologist, USFS PNW Research Station, Corvallis, Oregon 97331.

Tóm tắt

Abstract:  Cool summertime stream temperature is an important component of high quality aquatic habitat in Oregon coastal streams. Within the Oregon Coast Range, small headwater streams make up a majority of the stream network; yet, little information is available on temperature patterns and the longitudinal variability for these streams. In this paper we describe preharvest spatial and temporal patterns in summer stream temperature for small streams of the Oregon Coast Range in forests managed for timber production. We also explore relationships between stream and riparian attributes and observed stream temperature conditions and patterns. Summer stream temperature, channel, and riparian data were collected on 36 headwater streams in 2002, 2003, and 2004. Mean stream temperatures were consistent among summers and generally warmed in a downstream direction. However, longitudinal trends in maximum temperatures were more variable. At the reach scale of 0.5‐1.7 km, maximum temperatures increased in 17 streams, decreased in seven streams and did not change in three reaches. At the subreach scale (0.1‐1.5 km), maximum temperatures increased in 28 subreaches, decreased in 14, and did not change in 12 subreaches. Models of increasing temperature in a downstream direction may oversimplify fine‐scale patterns in small streams. Stream and riparian attributes that correlated with observed temperature patterns included cover, channel substrate, channel gradient, instream wood jam volume, riparian stand density, and geology type. Longitudinal patterns of stream temperature are an important consideration for background characterization of water quality. Studies attempting to evaluate stream temperature response to timber harvest or other modifications should quantify variability in longitudinal patterns of stream temperature prior to logging.

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Journal of the American Water Resources Association

Tập 44 Số 4

803-813

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