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首页> 外文期刊>Canadian water resources journal >Spatial and temporal variability of the solar radiation heat flux in streams of a forested catchment
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Spatial and temporal variability of the solar radiation heat flux in streams of a forested catchment

机译：Spatial and temporal variability of the solar radiation heat flux in streams of a forested catchment

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Solar radiation is generally the largest contributing flux to the heat budget of streams and itsestimation is crucial to predict stream water temperature with process-based models. The objectiveof this research is to quantify the spatial (between-site comparison of different stream sizes,within-site comparison at the reach scale) and temporal (seasonal, daily and hourly scales) variabilityin the transmission coefficient, which represents the proportion of incoming solar radiationreaching streams. We measured solar radiation at an open site with a meteorologicalstation and at microclimate sites located in three streams of various sizes in the Miramichi Riverbasin (Canada). During the summer, the percentage of incoming daily solar radiation reaching astream varied from 8 in a small headwater stream (Trib) to 43 in a medium-sized stream(CatBk) and was close to 100 in a wide river (LSWM). We observed the largest variabilitybetween transmission coefficients for different stream sizes (range of variation = 92) due tovery different canopy closures, followed by variability at the reach scale between lateral positions(range = 21 between left and right banks) and between longitudinal positions (range = 11between upstream and downstream sites), as measured at the medium-sized stream. Temporalvariability was greatest at the seasonal scale where the transmission coefficient varied by 23between May and September at the small headwater stream. The hourly variability of the transmissioncoefficient (i.e. associated with different solar angles) surpassed daily variability (i.e. associatedwith different cloud cover conditions), with coefficients of variation computed at thehourly time scale three to five times greater than at the daily time scale. Overall, this researchoffers insight regarding the handling of spatial and temporal variability of solar radiation whichshould provide further insight to improve process-based stream temperature models.

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