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Water 2016, 8(7), 269; doi:10.3390/w8070269

A Novel Approach for Estimating the Recurrence Intervals of Channel-Forming Discharges

1
Department of Food, Agricultural and Biological Engineering, The Ohio State University, Columbus, OH 43210, USA
2
Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Athanasios Loukas
Received: 17 February 2016 / Revised: 19 June 2016 / Accepted: 21 June 2016 / Published: 28 June 2016
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Abstract

Channel-forming discharges typically are associated with recurrence intervals less than five years and usually less than two years. However, the actual frequency of occurrence of these discharges is often several times more frequent than the statistical expectation. This result was confirmed by using the Log-Pearson Type 3 statistical method to analyze measured annual series of instantaneous peaks and peak daily means for 150 catchments in six states in the North Central Region of the United States. Discharge records ranged from 39 to 102 years and catchment sizes ranged from 29 to 6475 km2. For each state, mean values of the ratio of the calculated to the expected occurrences exceeded 1.0, for recurrence intervals from two years to 100 years with R-squared values varying from 0.64 to 0.97, respectively. However, catchment-by-catchment variability was too large for the relationships for each state to be useful. We propose a method, called Full Daily Distribution (FDD), which used all of the daily values for the available period of records. The approach provided ratios of calculated to expected occurrences that were approximately 1.0. For recurrence intervals less than five years, the FDD calculated discharges were much greater than those obtained by using the Log-Pearson Type 3 approach with annual series of instantaneous peaks or peak daily means. The method can also calculate discharges for recurrence intervals less than one year. The study indicates a need to enhance the Log-Pearson Type 3 method to provide better estimates of channel-forming discharges and that the proposed FDD could be a useful tool to this purpose. View Full-Text
Keywords: channel-forming discharges; Log-Pearson Type 3; annual series of peaks; probability density function; annual occurrences; river restoration channel-forming discharges; Log-Pearson Type 3; annual series of peaks; probability density function; annual occurrences; river restoration
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ward, A.; Moran, M. A Novel Approach for Estimating the Recurrence Intervals of Channel-Forming Discharges. Water 2016, 8, 269.

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