A Framework to Develop Intensity-Duration-Frequency Curves for Ungauged Sites in Vietnam: The Case of Hoa Binh Province

The Intensity-Duration-Frequency (IDF) curves play especially important role in water resources engineering or design of infrastructure. It is widely applied to quantify the probability of occurrence of extreme precipitation events. The IDF curves often based on the long-term historical precipitation observation at high spatial temporal resolution. However, it is difficult to gather the long records of short duration precipitation in most areas of developing countries like Vietnam. It is note-worthy that the satellite-based or reanalysis precipitation products are recently becoming available, providing the high-resolution estimations at regional or even global scales. Therefore, this study provides a framework to develop IDF curves based on the different precipitation data for ungauged sites in Vietnam and taking Hoa Binh province as a pilot. The products of satellite-based and reanalysis precipitation are investigated and evaluated. More importantly, the station-based precipitation is used to evaluate and correct the different products. The results illustrate an agreement, to a good extent, of IDF curves derived from the considered precipitation products.