 |
| Titel |
Exploring the physical controls of regional patterns of flow duration curves – Part 4: A synthesis of empirical analysis, process modeling and catchment classification |
| VerfasserIn |
M. Yaeger, E. Coopersmith, S. Ye, L. Cheng, A. Viglione, M. Sivapalan  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 11 ; Nr. 16, no. 11 (2012-11-26), S.4483-4498 |
| Datensatznummer |
250013588
|
| Publikation (Nr.) |
 copernicus.org/hess-16-4483-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| The paper reports on a four-pronged study of the physical
controls on regional patterns of the flow duration curve (FDC). This
involved a comparative analysis of long-term continuous data from nearly 200
catchments around the US, encompassing a wide range of climates, geology,
and ecology. The analysis was done from three different perspectives –
statistical analysis, process-based modeling, and data-based classification
– followed by a synthesis, which is the focus of this paper. Streamflow data
were separated into fast and slow flow responses, and associated signatures,
and both total flow and its components were analyzed to generate patterns.
Regional patterns emerged in all aspects of the study. The mixed gamma
distribution described well the shape of the FDC; regression analysis
indicated that certain climate and catchment properties were first-order
controls on the shape of the FDC. In order to understand the spatial
patterns revealed by the statistical study, and guided by the hypothesis
that the middle portion of the FDC is a function of the regime curve (RC,
mean within-year variation of flow), we set out to classify these
catchments, both empirically and through process-based modeling, in terms of
their regime behavior. The classification analysis showed that climate
seasonality and aridity, either directly (empirical classes) or through
phenology (vegetation processes), were the dominant controls on the RC.
Quantitative synthesis of these results determined that these classes were
indeed related to the FDC through its slope and related statistical
parameters. Qualitative synthesis revealed much diversity in the shapes of
the FDCs even within each climate-based homogeneous class, especially in the
low-flow tails, suggesting that catchment properties may have become the
dominant controls. Thus, while the middle portion of the FDC contains the
average response of the catchment, and is mainly controlled by climate, the
tails of the FDC, notably the low-flow tails, are mainly controlled by
catchment properties such as geology and soils. The regime behavior explains
only part of the FDC; to gain a deeper understanding of the physical
controls on the FDC, these extremes must be analyzed as well. Thus, to
completely separate the climate controls from the catchment controls, the
roles of catchment properties such as soils, geology, topography etc. must
be explored in detail. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|