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Functional approach to exploring climatic and landscape controls of runoff generation: 1. Behavioral constraints on runoff volume

Water resources research, 2014-12, Vol.50 (12), p.9300-9322 [Peer Reviewed Journal]

2014. American Geophysical Union. All Rights Reserved. ;ISSN: 0043-1397 ;EISSN: 1944-7973 ;DOI: 10.1002/2014WR016307

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Title:
Functional approach to exploring climatic and landscape controls of runoff generation: 1. Behavioral constraints on runoff volume
Author: Li, Hong-Yi ; Sivapalan, Murugesu ; Tian, Fuqiang ; Harman, Ciaran
Subjects: Agglomeration ; Aggregation ; Annual ; Annual runoff ; annual water balance ; Approximation ; Aridity ; Atmospheric precipitations ; Banks (topography) ; Biological competition ; Budyko curve ; Catchment area ; Catchment areas ; Catchment scale ; Catchments ; Climate ; Climate effects ; Commonality ; Competition ; Components ; Computer simulation ; Drainage ; Drying ; Dunne diagram ; Falling ; Hydrologic models ; Hydrology ; Landscape ; Mean annual runoff ; Overland flow ; parameter interconnection ; Precipitation ; Properties ; Rainfall ; Runoff ; runoff generation mechanisms ; Runoff volume ; Sequencing ; Similarity ; Slope ; Soil ; Soils ; Storage ; Surface runoff ; Topography ; Topography (geology) ; Volume ; Water balance ; Wetting
Is Part Of: Water resources research, 2014-12, Vol.50 (12), p.9300-9322
Description: Inspired by the Dunne diagram, the climatic and landscape controls on the partitioning of annual runoff into its various components (Hortonian and Dunne overland flow and subsurface stormflow) are assessed quantitatively, from a purely theoretical perspective. A simple distributed hydrologic model has been built sufficient to simulate the effects of different combinations of climate, soil, and topography on the runoff generation processes. The model is driven by a sequence of simple hypothetical precipitation events, for a large combination of climate and landscape properties, and hydrologic responses at the catchment scale are obtained through aggregation of grid‐scale responses. It is found, first, that the water balance responses, including relative contributions of different runoff generation mechanisms, could be related to a small set of dimensionless similarity parameters. These capture the competition between the wetting, drying, storage, and drainage functions underlying the catchment responses, and in this way, provide a quantitative approximation of the conceptual Dunne diagram. Second, only a subset of all hypothetical catchment/climate combinations is found to be “behavioral,” in terms of falling sufficiently close to the Budyko curve, describing mean annual runoff as a function of climate aridity. Furthermore, these behavioral combinations are mostly consistent with the qualitative picture presented in the Dunne diagram, indicating clearly the commonality between the Budyko curve and the Dunne diagram. These analyses also suggest clear interrelationships amongst the “behavioral” climate, soil, and topography parameter combinations, implying these catchment properties may be constrained to be codependent in order to satisfy the Budyko curve. Key Points: Functional similarity dimensionless numbers identified for water balance Commonality of Dunne diagram and Budyko curve Codependence amongst climate, soil, and topography
Publisher: Washington: Blackwell Publishing Ltd
Language: English
Identifier: ISSN: 0043-1397
EISSN: 1944-7973
DOI: 10.1002/2014WR016307
Source: Wiley Blackwell AGU Digital Library
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Functional approach to exploring climatic and landscape controls of runoff generation: 1. Behavioral constraints on runoff volume

2014. American Geophysical Union. All Rights Reserved. ;ISSN: 0043-1397 ;EISSN: 1944-7973 ;DOI: 10.1002/2014WR016307

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