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Item type:Publication, Access status: without files , Optimizing sensor location for the parsimonious design of flood early warning systemsFlood early warning systems (FEWS) are effective means for saving human lives from the devastating impacts of extreme hydrological events. FEWS relies on hydrologic monitoring networks that are typically expensive and challenging to design. This issue is particularly relevant when identifying the most cost-efficient number, type, and positioning of the sensors for FEWS that may be used to take decisions and alert the population at flood risk. In this study, we focus on a widely recognized FEWS solution to analyze hydrological monitoring and forecasting performances expressed as discharge in various cross-sections of a drainage network. We propose and test a novel framework that aims to maximize FEWS performances while minimizing the number of sections that need instrumentation and suggesting optimal sensor placement to enhance forecasting accuracy. In the selected case study, we demonstrate through feature importance measure that only four sub-basins can achieve the same forecasting performance as the potential twenty-six cross-sections of the local hydrologic monitoring network. The operational dashboard resulting from our proposed framework can assist decision-makers in maximizing the performance and wider adoption of flood early warning systems across geographic and socio-economic scales.Publicationtype: Letter to the Editor6 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Continuous hydrologic modelling for small and ungauged basins: a comparison of eight rainfall models for sub-daily runoff simulations(Elsevier, 2022-04-25); ; ; ; Continuous hydrologic modelling is a natural evolution of the event-based design approach in modern hydrology. It improves the rainfall-runoff transformation and provides the practitioner with more effective hydrological output information for risk assessment. However, this approach is still not widely adopted, mainly because the choice of the most appropriate rainfall simulation model (which is the core of continuous frameworks) for the specific aim of risk analysis has not been sufficiently investigated. In this paper, we test eight rainfall models by evaluating the performances of the simulated rainfall time series when used as input for a simplified continuous rainfall-runoff model, the COSMO4SUB, which is particularly designed for small and ungauged basins. The comparison confirms the capability of all models to provide realistic flood events and allows identifying the models to be further improved and tailored for data-scarce hydrological risk applications. The suggested framework is transferable to any catchment while different hydrologic and rainfall models can be used.Publicationtype: Journal Article7 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Design hydrograph estimation in small and ungauged watersheds: Continuous simulation method versus event-based approachThe proper assessment of design hydrographs and their main properties (peak, volume and duration) in small and ungauged basins is a key point of many hydrological applications. In general, two types of methods can be used to evaluate the design hydrograph: one approach is based on the statistics of storm events, while the other relies on continuously simulating rainfall-runoff time series. In the first class of methods, the design hydrograph is obtained by applying a rainfall-runoff model to a design hyetograph that synthesises the storm event. In the second approach, the design hydrograph is quantified by analysing long synthetic runoff time series that are obtained by transforming synthetic rainfall sequences through a rainfall-runoff model. These simulation-based procedures overcome some of the unrealistic hypotheses which characterize the event-based approaches. In this paper, a simulation experiment is carried out to examine the differences between the two types of methods in terms of the design hydrograph's peak, volume and duration. The results conclude that the continuous simulation methods are preferable because the event-based approaches tend to underestimate the hydrograph's volume and duration. © 2011 John Wiley & Sons, Ltd.Publicationtype: Journal Article5 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A continuous simulation model for design-hydrograph estimation in small and ungauged watershedsThe estimation of design hydrographs for small and ungauged watersheds is a key topic in hydrology. In this context, event-based procedures, which transform design storms deduced from intensity-duration-frequency curves by lumped rainfall-runoff models, are commonly applied. This study introduces a continuous simulation model that involves a two-stage rainfall generator, a geomorphological rainfall-runoff model and a flood frequency analysis applied to simulated runoff time series. The resulting design hydrograph with an assigned return period preserves peak and volume information. The case study results indicate that the continuous model is able to return a range of flood scenarios corresponding to a wide range of possible watershed physical conditions. Moreover, the rainfall-runoff model applied using empirical calibration without observations appears to be as accurate as other models based on regionalized information. © 2012 Copyright 2012 IAHS Press.Publicationtype: Journal Article4