The BasinTemp model predicts stream temperatures using digital topography and vegetation data. The model was developed to fill needs that are not met by existing basin-scale models which have considerable data input and computer processing requirements. The model is primarily intended for stream temperature predictions during the summer months when peak stream temperatures have the greatest impact on biotic populations. BasinTempÓ enables the user to analyze the role of riparian vegetation on stream temperature at the individual reach-scale, and also the cumulative effects of riparian vegetation on downstream temperatures. One of BasinTemp's strengths is that it allows the user to adjust riparian tree heights according to different criteria and assess the resulting impact on stream temperatures. BasinTempÓ has simple input and data requirements, which allows it to be quickly and efficiently applied in new large basins.

BasinTemp uses topography derived from digital terrain models (DTMs), and vegetation data derived from satellite imagery or aerial photographs. A limited number of site-specific stream temperature measurements are also required to optimize temperature predictions. The model makes the basic assumption that summer stream temperatures are primarily governed by the amount of solar radiation received at the stream surface. For much of the Pacific Northwest, topographic shading, and more significantly, riparian shading, are the major constraints on radiation reaching the stream surface. BasinTemp uses a geographic information system (GIS) to determine the heat from solar irradiation reaching individual stream segments. These data, together with hydrologic data, are used by a heat balance model to calculate the reach-specific stream temperatures.

For data requirements, click here.

For further information about BasinTemp, contact:

Douglas Allen or Peter Baker
Stillwater Sciences
2532 Durant Avenue
Berkeley, CA 94704
(510) 848-8098
(510) 848-8398 (fax)