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  • Results of the DMIP 2 Oklahoma experiments

Results of the DMIP 2 Oklahoma experiments

Smith, MB., Koren, V., Zhang, Z., Zhang, Y., Reed, SM., Cui, Z., Moreda, F., Cosgrove, BA., Mizukami, N., Anderson, EA., & DMIP 2 Participants (2012). Results of the DMIP 2 Oklahoma experiments. Journal of Hydrology, 418-419, 17-48. https://doi.org/10.1016/j.jhydrol.2011.08.056

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Abstract

Phase 2 of the Distributed Model Intercomparison Project (DMIP 2) was formulated primarily as a mechanism to help guide the US National Weather Service (NWS) as it expands its use of spatially distributed watershed models for operational river, flash flood, and water resources forecasting. The overall purpose of DMIP 2 was to test many distributed models with operational quality data with a view towards meeting NWS operational forecasting needs. At the same time, DMIP 2 was formulated as an experiment that could be leveraged by the broader scientific community as a platform for testing, evaluating, and improving the science of spatially distributed models.

This paper presents the key results of the DMIP 2 experiments conducted for the Oklahoma region, which included comparison of lumped and distributed model simulations generated with uncalibrated and calibrated parameters, water balance tests, routing and soil moisture tests, and simulations at interior locations. Simulations from 14 independent groups and 16 models are analyzed. As in DMIP 1, the participant simulations were evaluated against observed hourly streamflow data and compared with simulations generated by the NWS operational lumped model. A wide range of statistical measures are used to evaluate model performance on both run-period and event basis. A noteworthy improvement in DMIP 2 was the combined use of two lumped models to form the benchmark for event improvement statistics, where improvement was measured in terms of runoff volume, peak flow, and peak timing for between 20 and 40 events in each basin.

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