Intensity-Duration-Frequency of Rainfall in Catalunya. Maximum Expected Precipitation and IDF Relationships at High Temporal and Spatial Resolution
[eng] Intensity - Duration - Frequency (IDF) relationships of extreme precipitation events are of high interest in hydrology. The building of infrastructure or designation of flood zone need, as groundwork, the recurrence intervals at which extreme episodes of rainfall can occur, i.e., the maximum i...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/151942 |
| Acceso en línea: | https://hdl.handle.net/2445/151942 http://hdl.handle.net/10803/668777 |
| Access Level: | acceso abierto |
| Palabra clave: | Precipitacions (Meteorologia) Hidrologia Estadística matemàtica Precipitations (Meteorology) Hydrology Mathematical statistics |
| Sumario: | [eng] Intensity - Duration - Frequency (IDF) relationships of extreme precipitation events are of high interest in hydrology. The building of infrastructure or designation of flood zone need, as groundwork, the recurrence intervals at which extreme episodes of rainfall can occur, i.e., the maximum intensities that can be expected for a given duration and return period. In this project 2,142 series of daily rainfall data were analysed and quality controlled after the design of a new specific procedure. The newly proposed quality control is able to classify available rainfall series according to their quality and, using this information, performs a relative comparison with nearby measures to attain a quality category for each daily value (in this project 14,144,395 measures were checked and 74% of them were considered reliable). Afterwards, climatic homogeneity of a selection of series was checked and 163 daily rainfall data series of high quality data in the temporal period 1942-2016 and uniformly distributed over the territory of Catalonia were used in the obtainment of Intensity-Duration-Frequency relationships. The obtainment of IDF was achieved by a temporal monofractal downscaling methodology implemented on a grid of high spatial resolution (1 km x 1 km) of maximum expected intensity in 24 hours. The spatial grid of maximum expected intensity in 24 hours at several return periods (2, 5, 10, 20, 50, 100, 200 and 500 years) was obtained from annual maximum precipitation in one day after correcting daily measures with an empirical factor thoroughly analysed in the scope of the project. The monofractal downscaling methodology was implemented after the obtainment of a single scaling exponent at the 163 selected locations; the scaling exponent was studied in relation to geographical and climatic characteristics of the study area. The final results of IDF relationships are provided as a set of maps that display the maximum expected intensity at a selection of durations (daily and subdaily, namely: 1h, 6h, 12h, 24h and 48h) and for a selection of return periods. The results are of high spatial resolution as they are obtained in a spatial grid of 1 km x 1 km. The results also have high temporal resolution as the intensity - frequency relationship can be calculated at any duration at the locations of the grid nodes using the provided empirical scaling exponent with validity as long as the duration ranges between 1 hour and 15 days. |
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