Deriving Rain Threshold for Early Warning Based on a Coupled Hydrological-Hydraulic Model

Abstract

Flash floods are highly variable phenomena in both time and space. Therefore, tools with the potential to provide early warning are needed to analyse them. In Europe, flash floods often occur on small catchments; it has already been shown that the spatial variability of rainfall has a great impact on the catchment response. The aim of this paper is to use a coupled hydrological-hydraulic model (MIKE SHE/MIKE 11) to determine the rainfall thresholds and transformation coefficients from hourly rain to other durations, which will lead to flooding of the inhabited areas to the ungauged Ungureni catchment. The model was calibrated and validated using a reference discharge previously obtained by UTCB at the downstream gauge section of Teleorman River (Tatarastii de Sus) using MIKE 11 UHM module. Once the rainfall thresholds are determined, they can be used in flood forecasting and issuing warning with lead time for the inhabitants of the two villages located in Ungureni watershed. The method proposed in this paper can be used for other watersheds prone to flooding, so warnings can be issued with lead time.

Improved Representation of Flow and Water Quality in a North-Eastern German Lowland Catchment by Combining Low-Frequency Monitored Data with Hydrological Modelling

“…The river network containing the Augraben River and its tributaries is defined in MIKE 11, as shown in Figure 6b. The coupling of MIKE SHE and MIKE 11 was done dynamically by considering the exchange of data between river links in MIKE 11 to the adjacent MIKE SHE grids after every computational time step [41]. The hydrological cycle in MIKE SHE is described by a water movement module (WMM).…”

Study on the early warning and forecasting of flash floods in small watersheds based on the rainfall pattern of risk probability combination

“…Many hydrologic models have been applied to simulate and forecast flash flood processes (Adamovic et al 2016;Zhang et al 2019). Ivanescu and Drobot (2016) used a hydrological-hydraulic model which coupled MIKE SHE with MIKE 11 to determine the rainfall thresholds and transformation coefficients from hourly rainfall to other durations in the early warning of flash floods. Douinot et al (2016) assessed the applicability of the FFG method on French Mediterranean catchments using the MARINE hydrological model.…”

Application of a Hydrological MIKE HYDRO River – UHM Model for Valea Rea River (Romania). Case Study, Flash Flood Event Occurred on August 1st, 2019.

“…Flash floods are among the most difficult natural hazards to predict in terms of time and place of occurrence. The areas and the hydro meteorological phenomena that lead to flash flood occurrence are challenging to identify (Ivănescu and Drobot, 2016). In small river basins with a concentration time of less than 6 hours, torrential rains can lead to flash floods.…”