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Current Shade-Thermal Energy
Field name = [SolShd]
This attribute estimates the thermal energy (watt-hours/m2) associated with current vegetation conditions reflected in tree height and basal area throughout the hottest day of the year (July 20th), using the shade model of (Groom et al. 2011). Vegetation data (Washington, Oregon and California) are obtained from LEMMA data.
The attribute is the amount of solar radiation (watt-hours/m2) into streams based on current vegetation basal area, tree height, channel width, channel orientation, topogrpahic shading and solar angle. The current shade-thermal energy attribute is compared to a hypothesized maximum shade value (based on the ninetieth percentile of tree height and basal area in the watershed) to calculate the thermal energy difference, that can be used to identify locations where adding shade would be most effective (see 'Most Effective Shade' attribute) on the NetMap Portal list. See NetMap's full online Technical Help.
If these attributes are not available for your own watershed, please contact us.
(Left) The shading and shadow relationships between shorter and more dense vegetation compared to taller and more open vegetation.
NetMap's predicted current thermal energy to streams and rivers under current shade conditions in the Nehalem watershed. The warmer colors indicate channel reaches with higher thermal loading conditions; only the salmon fish bearing potion of the network is shown.
