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| Titel |
Experimental analysis of drainage and water storage of litter layers |
| VerfasserIn |
A. Guevara-Escobar, E. González-Sosa, M. Ramos-Salinas, G. D. Hernandez-Delgado |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 11, no. 5 ; Nr. 11, no. 5 (2007-10-25), S.1703-1716 |
| Datensatznummer |
250009478
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| Publikation (Nr.) |
 copernicus.org/hess-11-1703-2007.pdf |
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| Zusammenfassung |
Many hydrological studies of forested ecosystems focus on the study of the
forest canopy and have partitioned gross precipitation into throughfall and
stemflow. However, the presence of forest litter can alter the quantities of
water available for soil infiltration and runoff. Little information exists
regarding the value of storage and drainage parameters for litter layers.
Vegetation parameters of this kind are required in physically-based and
lumped conceptual models to quatify the availabilty and distribution of
water. Using a rainfall simulator and laboratory conditions two main
objectives were investigated using layers of recently seneced poplar leaves,
fresh grass or woodchips:
1) Effect of rain intensity on storage. With this respect we found that:
maximum storage (Cmax), defined as the detention of water
immediately before rainfall cessation, increased with rainfall intensity. The
magnitude of the increment was up to 0.5 mm kg−1 m−2 between the
lowest (9.8 mm h−1) and highest (70.9 mm h−1) rainfall
intensities for poplar leaves. Minimum storage (Cmin), defined
as the detention of water after drainage ceased, was not influenced by
rainfall intensity. Repeated wetting-draining cycles or layer thickness have
no effect on Cmax or Cmin.
2) The evaluation of drainage coefficient for the Rutter model. This model
was found accurate to predict storage and drainage in the case of poplar
leaves, was less accurate for fresh grass and resulted in overestimations for
woodchips.
Additionally, the effect of an underlaying soil matrix on lateral movement of
water and storage of poplar leaves was studied. Results indicated that the
soil matrix have no effect on Cmax or Cmin of the
litter layer. Lateral movement of water in the poplar layer was observed at
intermediate rainfall intensities (30.2 and 40.4 mm h−1), but not a
the lowest or highest rates. |
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