Memorias de investigación
Communications at congresses:
Identification of flood - rich and flood - poor periods in flood series

Research Areas
  • Civil engineering

Non-stationarity in flood series is generally assumed as result of changes in flood drivers, such as climate change, wildfires, volcanic eruptions, land-use changes, anthropogenic actions or relocation of gauging stations. Many studies to detect trends in flood series have been conducted recently, either at national or trans-national scales. In Spain, a study to detect flood trends at a national spatial scale has been presented recently, finding a generalised decreasing trend in floods. The largest available dataset of gauging stations in Spain where effects of dam regulation on flow regimes can be neglected was obtained. A multi-temporal analysis was conducted to identify given either starting or ending years that could lead to the detected significant trends. A flood-rich period in 1950-1970 seemed to lead to the generalised decreasing trends, as it is placed at the beginning of the flood series. However, this multi-temporal test cannot identify accurately flood-rich and flood-poor periods. A methodology to identify flood-rich and flood-poor periods that are statistically significant is developed, based on comparing the expected sampling variability of floods when stationarity is assumed with the observed variability of floods in a given record. The methodology is applied to the series of annual maximum floods, peaks over threshold and counts of annual occurrences in peaks over threshold series in the period 1942-2009.
12th British Hydrological Society National Symposium: Challenging hydrological theory and practice
Birmingham (Reino Unido)
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Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Hidroinformática y Gestión del Agua
  • Departamento: Ingeniería Civil: Hidráulica, Energía y Medio Ambiente