Rainfall Extremes: a Novel Modeling Approach for Regionalization

Abstract

The rainfall events of extreme magnitude over the past few decades have caused destructive damages to lives and properties, especially in the subcontinent (e.g. Pakistan, India, Bangladesh etc). Rainfall hazard maps for these areas can be of great practical and theoretical interests. In our work, we used extreme value analysis and spatial interpolation techniques to provide such maps through a combination of the Tropical Rainfall Measuring Mission Precipitation (TRMM) 3B42 product and raingauge data. This mixed approach takes advantage of both the long time series available at a limited number of stations, and the large spatial coverage of the satellite data which, instead, has a poor temporal extent. The methodology is implemented by (1) creating a unique growth curve for the homogeneous region by utilizing in-situ rainfall data and (2) mapping the parameters of intensity-duration functions for the entire length of the study area by using Water Resour Manage TRMM 3B42 product. The regional results obtained by using mixed approach and TRMM 3B42 are compared with the estimates obtained by using in-situ data. The comparison showed that the overall output of mixed approach is more consistent with what transpired by in-situ data for a predefined return period.

Efectos de la variabilidad climática sobre las coberturas del suelo de distintas cuencas hidrográficas de Argentina

“…Se ha evidenciado que a escala nacional los eventos de heladas meteorológicas tienen una tendencia negativa, como consecuencia de un aumento de las temperaturas máximas (Barrucand y Rusticucci, 2001;Fernández-Long et al, 2013). Además, las precipitaciones del país, al igual que en el resto del mundo, tienen una distribución espacial heterogénea, caracterizada en su mayoría por un cambio en su intensidad y torrencialidad (Qamar et al, 2017).…”

Methodology for IDF equation based on reduced pluviograph records

“…Extreme precipitation is one of the most common extreme weather events, and it tends to trigger associated natural hazards, such as floods, urban waterloggings, landslides, and debris flows (Gao et al, 2017). In the urban environment, floods, which are a consequence of extreme weather events, often cause socioeconomic and environmental damage, and even human loss (Qamar et al, 2017). Thus, as a way of mitigating the effect of this phenomenon, reducing the losses generated by them, hydraulic-hydrological designs, such as collection systems, must consider the maximum flow.…”

Equação de chuvas intensas para Abaetetuba-PA: estudo comparativo

“…Além disso, situações de inundações urbanas também podem ocorrer quando o sistema de drenagem possui falhas em seu projeto, os quais devem ser dimensionados considerando um evento extremo de precipitação pluviométrica (Rocha Neto & Blanco, 2020). No meio urbano, as inundações podem ser responsáveis por ocasionar danos socioeconômicos, prejuízos ambientais e até mesmo perdas humanas (Qamar et al, 2017). Dessa forma, para mitigar os efeitos deste fenômeno, diminuindo os prejuízos gerados por eles, as obras hidráulicas, como sistemas de drenagem, devem ser projetadas com base nos valores de vazão máxima, sendo essencial a verificação apropriada das características hidrológicas do local de interesse para a garantia de requisitos mínimos de segurança, durabilidade e eficiência do sistema (Fadhel, Rico-Ramirez, & Han, 2017;Santos, Fernandes, & Medeiros, 2019).…”