Correspondence: Space-time asymmetry undermines water yield assessment
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چکیده
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Correspondence: Reply to ‘Space-time asymmetry undermines water yield assessment'
We appreciate the comments by Berghuijs and Woods1 on our study2 that investigates how land cover and climate affect watershed water yield at the global scale. We used published data worldwide to examine the validity of Fuh’s equation and address the interactions of water yield coefficient (R/P) with wetness index (P/PET) and watershed characteristics (m). Berghuijs and Woods1 argue that we imp...
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In their recent study, Zhou et al.1 (hereafter Z15) aim at mapping global patterns of the relative contributions of climate and landcover change on the water yield coefficient. However, implicit and not discussed assumptions on ‘typical changes’ of the considered forcing factors2,3 raise questions on the physical integrity of substantial aspects of their analysis4. In fact, we show here that ce...
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with A= θ/4, B = (r − 1)θ/2N and C = rθ/2N . Note that k represents the number of steps in time, each of duration δt= σt/ √ N , from the position of the maxima. We want the approximation to be valid for a finite range around the maxima in the limit N→∞, and so we need k, and thus r, to vary over the range from 1 to order √ N . It follows that we can use the approximations cos(B)≈ 1, cos(C)≈ 1, ...
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ژورنال
عنوان ژورنال: Nature Communications
سال: 2016
ISSN: 2041-1723
DOI: 10.1038/ncomms11603