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    Author(s): Rafael Real de Asua; Ethan Bell; Bruce Orr; Peter Baker; Kevin Faucher
    Date: 2012
    Source: In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 141-150
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (847.39 KB)

    Description

    We used BasinTemp to predict summer stream temperatures in South Fork Ten Mile River (SFTMR), Mendocino County. BasinTemp is a temperature model that attempts to quantify the basin-wide effects of high summer stream temperatures in basins where the data inputs are scarce. It assumes that direct solar radiation is the chief mechanism behind stream summer heating in mid latitudes. We applied it in the SFTMR basin to understand the dynamics of summer stream temperatures, the influence of timber management and the effects of climate change on water temperatures, and its implications for coho salmon habitat. Three vegetation scenarios (current vegetation conditions, reference vegetation conditions and topography only conditions) and their effects on the Maximum Weekly Average Temperatures (MWATs) throughout the basin were analyzed for 3 different years. We predicted a significant increase in water temperature related to the decrease in shade as vegetation conditions shift from reference to current and to topographic conditions under timber management. We also found that current vegetation conditions account for significant amounts of shade that reduce solar radiation and stream temperatures and that discharge has a growing effect in water temperatures as the basin approaches topographic conditions.

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    Citation

    Real de Asua, Rafael; Bell, Ethan; Orr, Bruce; Baker, Peter; Faucher, Kevin. 2012. Use of BasinTemp to model summer stream temperatures in the south fork of Ten Mile River, CA . In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 141-150.

    Keywords

    BasinTemp, riparian shade, stream temperature, model, watershed management

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