 |
| Titel |
Towards reconstruction of the flow duration curve: development of a conceptual framework with a physical basis |
| VerfasserIn |
Y. Yokoo, M. Sivapalan  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 9 ; Nr. 15, no. 9 (2011-09-09), S.2805-2819 |
| Datensatznummer |
250012955
|
| Publikation (Nr.) |
 copernicus.org/hess-15-2805-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper we investigate the climatic and landscape controls on the flow
duration curve (FDC) with the use of a physically-based rainfall-runoff
model. The FDC is a stochastic representation of the variability of runoff,
which arises from the transformation, by the catchment, of within-year
variability of precipitation that can itself be characterized by a
corresponding duration curve for precipitation (PDC). Numerical simulations
are carried out with the rainfall-runoff model under a variety of
combinations of climatic inputs (i.e. precipitation, potential evaporation,
including their within-year variability) and landscape properties
(i.e. soil type and depth). The simulations indicated that the FDC can be
disaggregated into two components, with sharply differing characteristics
and origins: the FDC for surface (fast) runoff (SFDC) and the FDC for
subsurface (slow) runoff (SSFDC), which included base flow in our analysis.
SFDC closely tracked PDC and can be approximated with the use of a simple,
nonlinear (threshold) filter model. On the other hand, SSFDC tracked the FDC
that is constructed from the regime curve (i.e. mean monthly runoff), which
can be closely approximated by a linear filter model. Sensitivity analyses
were carried out to understand the climate and landscape controls on each
component, gaining useful physical insights into their respective shapes. In
particular the results suggested that evaporation from dynamic saturated
areas, especially in the dry season, can contribute to a sharp dip at the
lower tail of the FDCs. Based on these results, we develop a conceptual
framework for the reconstruction of FDCs in ungauged basins. This framework
partitions the FDC into: (1) a fast flow component, governed by a filtered
version of PDC, (2) a slow flow component governed by the regime curve, and
(3) a correction to SSFDC to capture the effects of high evapotranspiration
(ET) at low flows. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|