The Event-specific Geomorphological Instantaneous Unit Hydrograph (E-GIUH): The basin hydrological response characteristic of a flood event

Andrieu, Hervé; Moussa, Roger; Kirstetter, Pierre‐Emmanuel

doi:10.1016/j.jhydrol.2021.127158

Cited by 8 publications

(4 citation statements)

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“…For the second modelling hypothesis, we made the effective rainfall partitioning between the two branches of the routing function vary with rainfall intensities: The assumption is that for larger rainfall intensities, faster processes occur in the catchment. Therefore, the model needs to route the effective rainfall faster than usual by diverting a higher fraction of P r to the direct branch (see Andrieu et al, 2021, for an application with geomorphological instantaneous unit hydrographs). Note that this dynamic effective rainfall partitioning into two branches (direct and indirect) is conceptual, which means that it aims to reproduce the catchment behaviour rather than any specific local physical process.…”

Section: Methodsmentioning

confidence: 99%

Catchment response to intense rainfall: Evaluating modelling hypotheses

Astagneau

Bourgin

Andréassian

et al. 2022

Hydrological Processes

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Floods resulting from high-intensity rainfall events are known to be difficult to simulate. The catchment response to such events is very heterogeneous due to complex combinations of hydrological processes at fine temporal and spatial scales. The goal of this study is to find a way to inform the structure of a hydrological model on the variability in catchment response to rainfall events. To that end, rainfall intensity was used as a proxy for the activation of fast heterogeneous runoff processes. We developed three hypotheses that increase the versatility of a hydrological model by modifying the volume and temporal distribution of effective rainfall when high-intensity rainfall events occur. These modifications were implemented within the GR5H lumped rainfall-runoff model. The different model versions were run on 229 French catchments where 10 652 flood events were selected. Model performance was assessed considering five groups of catchments, and model performance was also evaluated based on three event characteristics. Results showed that introducing a dynamic dependency of fluxes to rainfall intensities at the hourly time step helps to improve the simulation of floods, especially on Mediterranean catchment areas. Generic values of the additional parameters are proposed to limit the increase in calibration complexity.

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Section: Methodsmentioning

confidence: 99%

Catchment response to intense rainfall: Evaluating modelling hypotheses

Astagneau

Bourgin

Andréassian

et al. 2022

Hydrological Processes

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“…The simplest and most widely used assumption assumes spatially uniform rain and a uniform runoff coefficient. This approach has been extended to represent variable rainfall in space (Moussa, 2008) or to take into account the spatial variability of rainfall and the runoff coefficient (Andrieu et al, 2021). These new approaches allow the calculation of GIUHs taking into account the spatial variability of rainfall and land cover, and thus make it possible to test the impact of future scenarios of change in rainfall or land use.…”

Section: Discussionmentioning

confidence: 99%

Section: Practical Use Of Morphometric Descriptors In Urban Areasmentioning

confidence: 99%

Morphometric properties, scaling laws and hydrologic response of the Greater Paris combined sewer system

Achour,

Chahinian,

Chancibault

et al. 2023

Hydrological Processes

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Morphometric properties of channel networks are useful tools to classify catchments and calculate their hydrological response. Scaling laws have been established for Optimal Channel Networks (OCNs), which are defined based on a generative geomorphological mechanism of minimizing the total energy dissipation. However, sewer networks obey engineering efficiency rules and are conceived based on local optimizations, both in time and space, for minimal costs. Not all the scaling laws have been verified for artificial sewer networks found in urban areas. This raises questions regarding the applicability of OCN scaling laws to sewer networks and their potential impact on the shape of the Geomorphological Instantaneous Unit Hydrograph (GIUH). Hence, this work aims to study the morphometric properties of the Greater Paris combined sewer system through a case study on twelve nested subcatchments. A two‐step methodology is used. First, the morphometric properties are analysed using the reference Horton‐Strahler, Rodríguez‐Iturbe and Moussa‐Bocquillon scaling laws. The results show that Horton‐Strahler's laws of bifurcation are verified while the length and area laws are not always verified. Rodriguez‐Iturbe and Moussa‐Bocquillon laws are verified with slightly different values of the descriptors in comparison to OCNs. Second, these morphometric properties are used to calculate four GIUHs: the reference Width Function (GWF), the Nash unit hydrograph (GN) using Horton‐Strahler ratios, the Nash Unit Hydrograph equivalent (GNe) using Moussa‐Bocquillon descriptors, and the Hayami function (GH) solution of the diffusive wave equation. We identified four catchments for which the scaling laws are verified and therefore all GIUHs are similar while for four other catchments the scaling laws are not verified and strongly impact the GIUHs. These morphometric descriptors and the GIUHs can be considered as ‘hydrological signatures’ of Combined Sewer Systems (CSSs) and are useful for the comparison and classification of hydrological responses.

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“…The proposed DTDUH was computed based on the runoff generation areas instead of the whole basin. This realization was significant different with the current understandings (Gibbs et al, 2010;Goñi et al, 2019;Andrieu et al, 2021). To this end, the TDUH and the DTDUH can be used for exploring the influence of spatial heterogeneity of runoff generation on the runoff routing.…”

Section: Forecasting Performance Advantage Analysis Of the Proposed D...mentioning

confidence: 92%

On the Influence of Spatial Heterogeneity of Runoff Generation on the Distributed Unit Hydrograph for Flood Prediction

Yi,

Chen,

Xie

2024

Preprint

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Abstract. The spatial scale mismatch between runoff generation and runoff routing is an acceptable compromise but a common issue in challenging hydrological modelling. Moreover, there is hardly any report available on whether unit hydrograph (UH) that is consistent with the spatial scale of runoff generation can be computed. The objective of this study was to explore the influence of spatial heterogeneity of runoff generation on the UH for flood prediction. To this end, a novel GIS-based dynamic time-varying unit hydrograph (DTDUH) was proposed based on the time-varying unit hydrograph (TDUH). The DTDUH can be defined as a typical hydrograph of direct runoff which gets generated from one centimeter of effective rainfall falling at a uniform rate over the saturated drainage basin uniformly during a specific duration. The DTDUH was computed based on the saturated areas of the watershed instead of the global watershed. The saturated areas were extracted based on the TWI. Finally, the Longhu River basin and Dongshi River basin were selected as two case studies. Results showed that the proposed method exhibited consistent or better performance compared with that of the linear reservoir routing method, and performed better than the TDUH method. Specifically, the DTDUH method indicated good performances for the flood events with low antecedent soil moisture, and it performed consistently with the TDUH when the global watershed is nearly saturated. The proposed method can be used for the watersheds with sparse gauging stations and limited observed rainfall and runoff data, as is the same with the TDUH method. Simultaneously, it is well applicable for the humid or mountain watershed where the saturation-excess rainfall is the dominant.

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The Event-specific Geomorphological Instantaneous Unit Hydrograph (E-GIUH): The basin hydrological response characteristic of a flood event

Cited by 8 publications

References 50 publications

Catchment response to intense rainfall: Evaluating modelling hypotheses

Catchment response to intense rainfall: Evaluating modelling hypotheses

Morphometric properties, scaling laws and hydrologic response of the Greater Paris combined sewer system

On the Influence of Spatial Heterogeneity of Runoff Generation on the Distributed Unit Hydrograph for Flood Prediction

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