NDLI: Methodology to estimate variations in solar radiation reaching densely forested slopes in mountainous terrain

Content Provider	Springer Nature Link
Author	Sypka, Przemysław Starzak, Rafał Owsiak, Krzysztof
Copyright Year	2016
Abstract	Solar radiation reaching densely forested slopes is one of the main factors influencing the water balance between the atmosphere, tree stands and the soil. It also has a major impact on site productivity, spatial arrangement of vegetation structure as well as forest succession. This paper presents a methodology to estimate variations in solar radiation reaching tree stands in a small mountain valley. Measurements taken in three inter-forest meadows unambiguously showed the relationship between the amount of solar insolation and the shading effect caused mainly by the contour of surrounding tree stands. Therefore, appropriate knowledge of elevation, aspect and tilt angles of the analysed planes had to be taken into consideration during modelling. At critical times, especially in winter, the diffuse and reflected components of solar radiation only reached some of the sites studied as the beam component of solar radiation was totally blocked by the densely forested mountain slopes in the neighbourhood. The cross-section contours and elevation angles of all obstructions are estimated from a digital surface model including both digital elevation model and the height of tree stands. All the parameters in a simplified, empirical model of the solar insolation reaching a given horizontal surface within the research valley are dependent on the sky view factor (SVF). The presented simplified, empirical model and its parameterisation scheme should be easily adaptable to different complex terrains or mountain valleys characterised by diverse geometry or spatial orientation. The model was developed and validated (R 2 = 0.92 , σ = 0.54) based on measurements taken at research sites located in the Silesian Beskid Mountain Range. A thorough understanding of the factors determining the amount of solar radiation reaching woodlands ought to considerably expand the knowledge of the water exchange balance within forest complexes as well as the estimation of site productivity.
Starting Page	1983
Ending Page	1994
Page Count	12
File Format	PDF
ISSN	00207128
Journal	International Journal of Biometeorology
Volume Number	60
Issue Number	12
e-ISSN	14321254
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-05-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solar surface irradiance Complex topography Obstruction effect Istebna spruce stand Environment Biological and Medical Physics, Biophysics Meteorology Animal Physiology Plant Physiology Environmental Health
Content Type	Text
Resource Type	Article
Subject	Ecology Health, Toxicology and Mutagenesis Atmospheric Science

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