Abstract
Analysis designed to test for step functions in time series provides an alternative to cyclic and secular analysis; it also amplifies probability analysis as this is usually practised. For the Ishikari River, step-functional testing identifies blocks of years, with average length 5 years, when annual floods ran generally above, generally below, or generally close to the series mean. Parallel testing for the Wabash River identifies runs of either high or low values, with average length between 4 and 5 years. Separate Gumbel graphs can be drawn for the high-flow and low-flow regimes, and also (if it exists) for the regime close to the mean. While long-term forecasting is not affected by our results, these do suggest great fluctuations in the flood hazard, in the short term.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
