In: Journal of Hydrology and Hydromechanics, vol. 66, no. 1
Jaime G. Cuevas - José L. Arumí - Alejandra Zúniga-Feest - Christian Little
Detaily:
Rok, strany: 2018, 32 - 42
O článku:
During hydrological research in a Chilean swamp forest, we noted a pattern of higher streamflows close to
midday and lower ones close to midnight, the opposite of an evapotranspiration (Et)-driven cycle. We analyzed this diurnal
streamflow signal (DSS), which appeared mid-spring (in the growing season). The end of this DSS coincided with a
sustained rain event in autumn, which deeply affected stream and meteorological variables. A survey along the stream
revealed that the DSS maximum and minimum values appeared 6 and 4 hours earlier, respectively, at headwaters located
in the mountain forests/ plantations than at the control point in the swamp forest. Et in the swamp forest was higher in the
morning and in the late afternoon, but this process could not influence the groundwater stage. Trees in the mountain
headwaters reached their maximum Ets in the early morning and/or close to midday. Our results suggest that the DSS is a
wave that moves from forests high in the mountains towards lowland areas, where Et is decoupled from the DSS. This
signal delay seems to convert the link between streamflow and Et in an apparent, but spurious positive relationship. It also
highlights the role of landscape heterogeneity in shaping hydrological processes.
Ako citovať:
ISO 690:
Cuevas, J., Arumí, J., Zúniga-Feest, A., Little, C. 2018. An unusual kind of diurnal streamflow variation. In Journal of Hydrology and Hydromechanics, vol. 66, no.1, pp. 32-42. 0042-790X (until 2019) .
APA:
Cuevas, J., Arumí, J., Zúniga-Feest, A., Little, C. (2018). An unusual kind of diurnal streamflow variation. Journal of Hydrology and Hydromechanics, 66(1), 32-42. 0042-790X (until 2019) .