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Probabilistic Description of Streamflow and Active Length Regimes in Rivers.

Nicola Durighetto1, Veronica Mariotto1, Francesca Zanetti1

  • 1Department of Civil, Environmental and Architectural Engineering University of Padua Padova Italy.

Water Resources Research
|July 22, 2022
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Summary
This summary is machine-generated.

Temporary rivers, though common, are understudied. This research introduces a new model to link river flow dynamics with river network length, classifying temporary river behaviors.

Keywords:
SLDCactive length regimesprobabilistic descriptionstream length duration curvestreamflow regimestemporary streams

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Area of Science:

  • Hydrology
  • Geomorphology
  • Environmental Science

Background:

  • Temporary rivers are globally prevalent yet understudied components of river networks.
  • Understanding their dynamics is crucial for water resource management and ecological assessments.

Purpose of the Study:

  • To develop a coupled probabilistic model for catchment discharge and active river network length dynamics.
  • To classify streamflow and active length regimes in temporary rivers using analytical expressions.

Main Methods:

  • Utilized a well-established hydrological model and a derived distribution approach.
  • Derived analytical expressions for flow duration curves (FDC) and stream length duration curves (SLDC).
  • Identified streamflow and active length regimes based on dimensionless parameters and scaling exponent 'b'.

Main Results:

  • Identified two streamflow regimes (persistent, erratic) and three active length regimes (ephemeral, perennial, ephemeral de facto).
  • Defined seven distinct behavioral classes based on FDC and SLDC shapes, modulated by the scaling exponent 'b'.
  • Validated the analytical model using data from catchments in Italy and the USA with satisfactory performance.

Conclusions:

  • Established a structural relationship between streamflow and active length regimes in temporary rivers.
  • The proposed framework offers a novel tool for analyzing discharge and river network length dynamics.
  • Highlights the significant role of the scaling exponent 'b' in modulating these dynamics.