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Classifying low flow hydrological regimes at a regional scale
Classifying low flow hydrological regimes at a regional scale
The paper uses a simple water balance model that partitions the precipitation between actual evapotranspiration, quick flow and delayed flow, and has sufficient complexity to capture the essence of climate and vegetation controls on this partitioning. Using this model, monthly flow duration curves have been constructed from climate data across Europe to address the relative frequency of ecologically critical low flow stages in semi-arid rivers, when flow commonly persists only in disconnected pools in the river bed. The hydrological model is based on a dynamic partitioning of precipitation to estimate water available for evapotranspiration and plant growth and for residual runoff. The duration curve for monthly flows has then been analysed to give an estimate of bankfull flow based on recurrence interval. Arguing from observed ratios of cross-sectional areas at flood and low flows, hydraulic geometry suggests that disconnected flow under "pool" conditions is approximately 0.1% of bankfull flow. Flow duration curves define a measure of bankfull discharge on the basis of frequency. The corresponding frequency for pools is then read from the duration curve, using this (0.1%) ratio to estimate pool discharge from bank full discharge. The flow duration curve then provides an estimate of the frequency of poorly connected pool conditions, corresponding to this discharge, that constrain survival of river-dwelling arthropods and fish. The methodology has here been applied across Europe at 15 km resolution, and the potential is demonstrated for applying the methodology under alternative climatic scenarios.
- University of Leeds United Kingdom
- Centre for Ecology and Hydrology United Kingdom
- University of Leeds, School of Geography United Kingdom
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Arora, V. K.: The use of thearidity index to assess climate change effect on annual runoff, J. Hydrol., 265, 164-177, 2002.
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Botter, G., Porporato, A., Rodriguez-Iturbe, I., and Rinaldo, A.: Nonlinear storage-discharge relations and catchment streamflow regimes, Water Resour. Rese. 45, W10427, doi:10.1029/2008WR007658, 2009.
Gallart, F., Prat, N., Brito, D., Garc´ıa-Roger, E., De Girolamo, A. M., Barbera´, G. G., Latron, J., Llorens, J. P., Lo Porto, A., Neves, R., Tzoraki, O. , Querner, E. P., Quin˜onero, J. M., Rieradevall, M., Tournoud, M. G., Nikolaidis, N. P., and Froebrich, J.: Using qualitative flow states for characterizing regimes of temporary streams: The “Aquatic States”. Poster presented at IUGG conference, Melbourne July 2011, session HW13, available at: https://iugg2011.epresenter.com.au/delegate.ep#lmdl=Login; smod=Base, 2011.
Hargreaves, G. H. and Samani, Z. A.: Estimating potential evapotranspiration, ASCE J. Irrig. Drain. Div., 108, 225-230, 1982.
Kirkby, M. J., Irvine, B. J., Jones, R. J. A., Govers, G., and the PESERA team: The PESERA coarse scale erosion model for Europe: I - Model rationale and implementation, Eur. J. Soil Sci., 59, 1293-1306, 2008.
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Leopold, L. B.: A view of the river,Harvard University Press, Cambridge, 1994.
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
Citations provided by BIP!Popularity provided by BIP!- University of Leeds United Kingdom
- Centre for Ecology and Hydrology United Kingdom
- University of Leeds, School of Geography United Kingdom
The paper uses a simple water balance model that partitions the precipitation between actual evapotranspiration, quick flow and delayed flow, and has sufficient complexity to capture the essence of climate and vegetation controls on this partitioning. Using this model, monthly flow duration curves have been constructed from climate data across Europe to address the relative frequency of ecologically critical low flow stages in semi-arid rivers, when flow commonly persists only in disconnected pools in the river bed. The hydrological model is based on a dynamic partitioning of precipitation to estimate water available for evapotranspiration and plant growth and for residual runoff. The duration curve for monthly flows has then been analysed to give an estimate of bankfull flow based on recurrence interval. Arguing from observed ratios of cross-sectional areas at flood and low flows, hydraulic geometry suggests that disconnected flow under "pool" conditions is approximately 0.1% of bankfull flow. Flow duration curves define a measure of bankfull discharge on the basis of frequency. The corresponding frequency for pools is then read from the duration curve, using this (0.1%) ratio to estimate pool discharge from bank full discharge. The flow duration curve then provides an estimate of the frequency of poorly connected pool conditions, corresponding to this discharge, that constrain survival of river-dwelling arthropods and fish. The methodology has here been applied across Europe at 15 km resolution, and the potential is demonstrated for applying the methodology under alternative climatic scenarios.