A general geomorphological recession flow model for river basins

Biswal, B and Nagesh Kumar, D (2013) A general geomorphological recession flow model for river basins. Water Resources Research, 49 (8). pp. 4900-4906. ISSN 0043-1397

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Recession flows in a basin are controlled by the temporal evolution of its active drainage network (ADN). The geomorphological recession flow model (GRFM) assumes that both the rate of flow generation per unit ADN length (q) and the speed at which ADN heads move downstream (c) remain constant during a recession event. Thereby, it connects the power law exponent of -dQ/dt versus Q (discharge at the outlet at time t) curve, α, with the structure of the drainage network, a fixed entity. In this study, we first reformulate the GRFM for Horton-Strahler networks and show that the geomorphic α (αg) is equal to D/(D-1), where D is the fractal dimension of the drainage network. We then propose a more general recession flow model by expressing both q and c as functions of Horton-Strahler stream order. We show that it is possible to have α =α g for a recession event even when q and c do not remain constant. The modified GRFM suggests that α is controlled by the spatial distribution of subsurface storage within the basin. By analyzing streamflow data from 39 U.S. Geological Survey basins, we show that α is having a power law relationship with recession curve peak, which indicates that the spatial distribution of subsurface storage varies across recession events

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IITH Creators:
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Item Type: Article
Uncontrolled Keywords: active drainage network; fractal dimension; geomorphological recession flow model; Horton-Strahler tree network; power law; subsurface storage distribution
Subjects: Civil Engineering > Soil Structure Interaction
Divisions: Department of Civil Engineering
Depositing User: Team Library
Date Deposited: 27 Nov 2014 05:54
Last Modified: 27 Nov 2014 05:54
URI: http://raiith.iith.ac.in/id/eprint/1002
Publisher URL: http://dx.doi.org/10.1002/wrcr.20379
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