A STUDY ON NONPARAMETRIC REGIONAL RAINFALL INTENSITY FORMULA
| Autor: | Doong, Dong-Jiing, 董東璟 |
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| Rok vydání: | 1996 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 84 Regional maximum rainfall intensity-duration frequency (IDF) curvesor formula have been widely used for estimating the design rainfall atungauged sites. This study used 1~24 hours rainfall annual maximumseries, which collected from 38 recording raingauges over northernTaiwan, to develop regional IDF formula. Before that, the frequencyanalysis at site was first studied. Historical recorded data was applied tocompare the performance of traditional parametric methods andnonparametric frequency analysis, which utilized Gauss distribution asKernel function and the least square cross validation method to calculatesmoothing factor. The comparisons show that the nonparametricfrequency has better performance based on Chi- square test, KS test andRMSE as criteria. Moreover, the comparison was further investigated interms of Monte Carlo and Resampling simulation techniques. The resultsimply that nonparametric frequency analysis have less variation for largereturn periods when the sample is relative small.This study further developed regional IDF based on the analysis ofnonparametric frequency analysis. The station-year method was applied topool nondimension rainfall intensity data in a homogeneous region, whichwas classified by Yu and Chen (1996). The average of daily annualmaximum rainfall was found to be suitable chosen as an index in regionalIDF formula. The simulation results show that the regional IDF formulahas less than 20% absolution error. The vertifiation results from sevenstations further concluded that the formulas can be reasonably applied tothe non-recording raingauges or ungauges sites. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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