A technique for deriving an average event unit hydrograph from streamflow—only data for ephemeral quick-flow-dominant catchments |
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Authors: | BFW Croke |
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Institution: | Integrated Catchment Assessment and Management Centre, School of Resources, Environment and Society, and Department of Mathematics, The Australian National University, Canberra, ACT 0200, Australia |
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Abstract: | A technique is presented for empirical and parametric estimation of an average event unit hydrograph response curve solely from measured streamflow data for use in rainfall-runoff models with a focus on modelling flow for natural resource management. As the technique does not require rainfall data, the unit hydrograph can be derived solely from streamflow data at a temporal resolution appropriate for the response of the catchment. The response curves derived for a number of stations show a power law relationship of decay in flow after peak that can be described using a three-parameter function. The approach is best suited to ephemeral streamflow regimes dominated by surface and near-surface runoff (quick-flow component) where flow events are well-separated and largely independent of each other. Analysis of the derived unit hydrograph for 28 quick-flow-dominated catchments illustrates the range of parameter values obtained in fitting the power law. |
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Keywords: | Unit hydrograph Water resource management Streamflow modelling Rainfall-runoff modelling |
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